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QPointingDeviceUniqueId Class
QPointingDeviceUniqueId identifies a unique object, such as a tagged token or stylus, which is used with a pointing device. More...
| Header: | #include <QPointingDeviceUniqueId> |
| qmake: | QT += gui |
| Since: | Qt 5.8 |
Properties
- numericId : const qint64
Public Functions
| QPointingDeviceUniqueId() | |
| bool | isValid() const |
| qint64 | numericId() const |
Static Public Members
| QPointingDeviceUniqueId | fromNumericId(qint64 id) |
Related Non-Members
| uint | qHash(QPointingDeviceUniqueId key, uint seed = 0) |
| bool | operator!=(QPointingDeviceUniqueId lhs, QPointingDeviceUniqueId rhs) |
| bool | operator==(QPointingDeviceUniqueId lhs, QPointingDeviceUniqueId rhs) |
Detailed Description
QPointingDeviceUniqueId identifies a unique object, such as a tagged token or stylus, which is used with a pointing device.
QPointingDeviceUniqueIds can be compared for equality, and can be used as keys in a QHash. You get access to the numerical ID via numericId(), if the device supports such IDs. For future extensions, though, you should not use that function, but compare objects of this type using the equality operator.
This class is a thin wrapper around an integer ID. You pass it into and out of functions by value.
This type actively prevents you from holding it in a QList, because doing so would be very inefficient. Use a QVector instead, which has the same API as QList, but more efficient storage.
See also QTouchEvent::TouchPoint.
Property Documentation
numericId : const qint64
This property holds the numeric unique ID of the token represented by a touchpoint
If the device provides a numeric ID, isValid() returns true, and this property provides the numeric ID; otherwise it is -1.
You should not use the value of this property in portable code, but instead rely on equality to identify pointers.
Access functions:
| qint64 | numericId() const |
See also isValid().
Member Function Documentation
QPointingDeviceUniqueId::QPointingDeviceUniqueId()
Constructs an invalid unique pointer ID.
[static]
QPointingDeviceUniqueId QPointingDeviceUniqueId::fromNumericId(qint64 id)
Constructs a unique pointer ID from numeric ID id.
bool QPointingDeviceUniqueId::isValid() const
Returns whether this unique pointer ID is valid, that is, it represents an actual pointer.
Related Non-Members
uint qHash(QPointingDeviceUniqueId key, uint seed = 0)
Returns the hash value for key, using seed to seed the calculation.
This function was introduced in Qt 5.8.
bool operator!=(QPointingDeviceUniqueId lhs, QPointingDeviceUniqueId rhs)
Returns whether the two unique pointer IDs lhs and rhs identify different pointers (true
) or not (false
).
This function was introduced in Qt 5.8.
bool operator==(QPointingDeviceUniqueId lhs, QPointingDeviceUniqueId rhs)
Returns whether the two unique pointer IDs lhs and rhs identify the same pointer (true
) or not (false
).
This function was introduced in Qt 5.8.


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Better DI Service Registration with Assembly Scan
May 30, 2020 19:16 · 1003 words · 5 minute read
Today, I will talk about a better way to register services for Microsoft’s DI container. Let’s have a look at the standard way of service registration.
public void ConfigureServices(IServiceCollection services)
{
...
services.AddTransient<ITestTransientService, TestTransientService>();
services.AddScoped<ITestScopedService, TestScopedService>();
services.AddSingleton<ITestSingletonService, TestSingletonService>();
...
}
There exists three types of object lifetime. I’m not going to explain all of them, since they are already well documented at Microsoft Docs.
For small scale applications the above usage is very acceptable. However, managing a large scale applications might require different solutions.
Now, I will show you 3 different solutions that you might like to use. First, I will consider all lifetimes separately. All three solutions require a NuGet package called Scrutor.
dotnet add package Scrutor
This package allows you to scan assemblies and register the services with implementations.
Solution 1
We will create three different empty interfaces which mark the implementations for lifetime registration.
public interface ITransient { }
public interface IScoped { }
public interface ISingleton { }
public interface ITransientService
{
string GetValue();
}
public interface IScopedService
{
string GetValue();
}
public interface ISingletonService
{
string GetValue();
}
public class TransientService : ITransientService, ITransient
{
private string guid = Guid.NewGuid().ToString();
public string GetValue()
{
return guid;
}
}
public class ScopedService : IScopedService, IScoped
{
private string guid = Guid.NewGuid().ToString();
public string GetValue()
{
return guid;
}
}
public class SingletonService : ISingletonService, ISingleton
{
private string guid = Guid.NewGuid().ToString();
public string GetValue()
{
return guid;
}
}
ITransient
, IScoped
and ISingleton
interfaces will represent each one of the lifetimes. Next thing is Startup.cs
file where magic happens.
public void ConfigureServices(IServiceCollection services)
{
...
services.Scan(i =>
i.FromCallingAssembly()
.AddClasses(c => c.AssignableTo<ITransient>())
.AsImplementedInterfaces()
.WithTransientLifetime()
.AddClasses(c => c.AssignableTo<IScoped>())
.AsImplementedInterfaces()
.WithScopedLifetime()
.AddClasses(c => c.AssignableTo<ISingleton>())
.AsImplementedInterfaces()
.WithSingletonLifetime()
);
...
}
The following code will scan the current assembly with respect to given lifetime interfaces and register them into DI container.
Solution 2
We can create attributes just like interfaces and use them similar to the first solution.
public class TransientAttribute : Attribute
{
public TransientAttribute()
{
}
}
public class ScopedAttribute : Attribute
{
public ScopedAttribute()
{
}
}
public class SingletonAttribute : Attribute
{
public SingletonAttribute()
{
}
}
[Transient]
public class TransientAttrService : ITransientService
{
private string guid = Guid.NewGuid().ToString();
public string GetValue()
{
return guid + " by Attribute";
}
}
[Scoped]
public class ScopedAttrService : IScopedService
{
private string guid = Guid.NewGuid().ToString();
public string GetValue()
{
return guid + " by Attribute";
}
}
[Singleton]
public class SingletonAttrService : ISingletonService
{
private string guid = Guid.NewGuid().ToString();
public string GetValue()
{
return guid + " by Attribute";
}
}
We can register the attributes with WithAttribute<T>
in Startup.cs
file.
public void ConfigureServices(IServiceCollection services)
{
...
services.Scan(i =>
i.FromCallingAssembly()
.AddClasses(c => c.WithAttribute<TransientAttribute>())
.AsImplementedInterfaces()
.WithTransientLifetime()
.AddClasses(c => c.WithAttribute<ScopedAttribute>())
.AsImplementedInterfaces()
.WithScopedLifetime()
.AddClasses(c => c.WithAttribute<SingletonAttribute>())
.AsImplementedInterfaces()
.WithSingletonLifetime()
);
...
}
Now we can use these attributes in the service implementations.
Solution 3
So far, we handled the lifetimes separately. Let’s create a common attribute which contains a lifetime value and then decorate services with that attribute.
public class InjectableAttribute : Attribute
{
public ServiceLifetime Lifetime { get; }
public InjectableAttribute(ServiceLifetime lifeTime = ServiceLifetime.Transient)
{
Lifetime = lifeTime;
}
}
[Injectable(ServiceLifetime.Transient)]
public class TransientInjectableService : ITransientService
{
private string guid = Guid.NewGuid().ToString();
public string GetValue()
{
return guid + " by Injectable";
}
}
[Injectable(ServiceLifetime.Scoped)]
public class ScopedInjectableService : IScopedService
{
private string guid = Guid.NewGuid().ToString();
public string GetValue()
{
return guid + " by Injectable";
}
}
[Injectable(ServiceLifetime.Singleton)]
public class SingletonInjectableService : ISingletonService
{
private string guid = Guid.NewGuid().ToString();
public string GetValue()
{
return guid + " by Injectable";
}
}
This looks better because now we can handle all lifetimes using the ServiceLifetime
value provided by Microsoft’s library. Now, in order to scan services, I have created an extension method that iterates through all lifetime types.
public static class ScrutorExtensions
{
public static IImplementationTypeSelector InjectableAttributes(this IImplementationTypeSelector selector)
{
var lifeTimes = Enum.GetValues(typeof(ServiceLifetime)).Cast<ServiceLifetime>();
foreach (var item in lifeTimes)
selector = selector.InjectableAttribute(item);
return selector;
}
public static IImplementationTypeSelector InjectableAttribute(this IImplementationTypeSelector selector, ServiceLifetime lifeTime)
{
return selector.AddClasses(c => c.WithAttribute<InjectableAttribute>(i => i.Lifetime == lifeTime))
.AsImplementedInterfaces()
.WithLifetime(lifeTime);
}
}
Calling the extension method on Startup.cs
. You can use either of them.
public void ConfigureServices(IServiceCollection services)
{
...
services.Scan(i =>
i.FromCallingAssembly()
.InjectableAttributes()
);
/* Or */
services.Scan(i =>
i.FromCallingAssembly()
.InjectableAttribute(ServiceLifetime.Transient)
.InjectableAttribute(ServiceLifetime.Scoped)
.InjectableAttribute(ServiceLifetime.Singleton)
);
...
}
Run the examples
You can switch the startup settings and run the following controller.
[ApiController]
[Route("[controller]")]
public class ServiceController : ControllerBase
{
private readonly ITransientService _transientService;
private readonly IScopedService _scopedService;
private readonly ISingletonService _singletonService;
public ServiceController(ITransientService transientService, IScopedService scopedService, ISingletonService singletonService)
{
_transientService = transientService;
_scopedService = scopedService;
_singletonService = singletonService;
}
[HttpGet("Transient")]
public string Transient()
{
return _transientService.GetValue();
}
[HttpGet("Scoped")]
public string Scoped()
{
return _scopedService.GetValue();
}
[HttpGet("Singleton")]
public string Singleton()
{
return _singletonService.GetValue();
}
}
Last solution is my favorite. It uses the ServiceLifetime as a parameter and you don’t need to repeat yourself for every single lifetime.
Assembly
Examples above use FromCallingAssembly
at the beginning of each scan, which would register services only in that specific ASP.NET Core Application. If you have separated your services from Application layer into a class library, you might want to use an entry point for that class library. For example, you can create a dummy class ServiceEntryPoint
in that library and call FromAssemblyOf<ServiceEntryPoint>()
then continue applying the rest of the settings.
Bonus
In order to make things more easier, I would like to draw your attention to the power of reflection. Let’s say you have services that ends with postfix e.g CountryBusinessService
, OrderBusinessService
, XBusinessService
. You can register them however you want, such as the example below.
public void ConfigureServices(IServiceCollection services)
{
...
services.Scan(i =>
i.FromCallingAssembly()
.AddClasses(c => c.Where(i => i.IsClass && i.Name.EndsWith("BusinessService")))
.AsImplementedInterfaces()
.WithTransientLifetime()
);
...
}
[ServiceProvider]
Scrutor has an attribute which works similar to the third solution. However, I could not find the documentation about how to use it. Therefore, I will not include it here.
Thanks for reading, you can reach out the source code from here !


gray background (better then dispatcher)
dispatcher: black background while source is gray
Does not fail


Overview
This class provides an entry point for configuration capabilities of widgets. It provides capabilities to show a configuration dialog, save properties to disk, and load properties on startup.
Here is a simple example that persists a String property:
var directoryName; Configuration { properties: [ StringProperty { name: "directoryName" value: bind directoryName with inverse } ] component: TextField {text: bind directoryName with inverse} onLoad: function() { loadDirectory(directoryName); } onSave: function() { loadDirectory(directoryName); } }
Notice that a variable is used to bind the String Property with a bi-directional bind. This allows seamless bijection of the loaded value into and saved value from the class and is a recommended practice.
Variable Summary
| access | name | type | Can Read | Can Init | Can Write | Default Value | description |
|---|---|---|---|---|---|---|---|
| public-init | onLoad | function():Void |
If set, this provides a load handler that will be called precisely once after the widget configuration is loaded. |
||||
| public-init | onSave | function():Void |
If set, this provides a save handler that will be called when the user explicitly saves configuration by clicking on the "Save" button in the configuration dialog, but before the properties are written to disk. If set, this provides a save handler that will be called when the user explicitly saves configuration by clicking on the "Save" button in the configuration dialog, but before the properties are written to disk. This will not be called for auto-save operations which can be enabled per (@see Property}. |
||||
| public | properties | Property[] |
A list of properties that will be read and written for persistence. A list of properties that will be read and written for persistence. This array must be populated prior to load, because only existing properties will have their values set. Likewise, on save all the values in this array will have their current values persisted. For an example of how to use this var, see the class documentation above. In order to remain backwards compatible with older versions of persisted configuration, it is recommended that property names are not reused for different purposes. This way the old property can be read in (or simply ignored) for backwards compatibility, while new properties can be added to handle additional requirements. |
||||
| public | scene | Scene |
The scene that will be displayed in a configuration dialog for editing properties of this widget. The scene that will be displayed in a configuration dialog for editing properties of this widget. If this is set to null configuration of the associated widget will be disabled. |


2 Samuel 2:19
And Asahel pursued after Abner; and in going he turned not to the right hand nor to the left from following Abner.


#import <NTBillboardStyleBuilder.h>
Instance Methods | |
| (float) | - getAttachAnchorPointX |
| (void) | - setAttachAnchorPointX: |
| (float) | - getAttachAnchorPointY |
| (void) | - setAttachAnchorPointY: |
| (void) | - setAttachAnchorPointX:attachAnchorPointY: |
| (BOOL) | - isCausesOverlap |
| (void) | - setCausesOverlap: |
| (BOOL) | - isHideIfOverlapped |
| (void) | - setHideIfOverlapped: |
| (float) | - getHorizontalOffset |
| (void) | - setHorizontalOffset: |
| (float) | - getVerticalOffset |
| (void) | - setVerticalOffset: |
| (int) | - getPlacementPriority |
| (void) | - setPlacementPriority: |
| (BOOL) | - isScaleWithDPI |
| (void) | - setScaleWithDPI: |
| (NSString *) | - swigGetClassName |
| (void *) | - swigGetDirectorObject |
| Instance Methods inherited from NTStyleBuilder | |
| (BOOL) | - isEqual: |
| (NSUInteger) | - hash |
| (NTColor *) | - getColor |
| (void) | - setColor: |
Class Methods | |
| (NTBillboardStyleBuilder *) | + swigCreatePolymorphicInstance:swigOwnCObject: |
A base class for BillboardStyleBuilder subclasses.
| - (float) getAttachAnchorPointX |
Returns the horizontal attaching anchor point of the billboard.
| - (float) getAttachAnchorPointY |
Returns the vertical attaching anchor point of the billboard.
| - (float) getHorizontalOffset |
Returns the horizontal offset of the billboard.
| - (int) getPlacementPriority |
Returns the placement priority of the billboard.
| - (float) getVerticalOffset |
Returns the vertical offset of the billboard.
| - (BOOL) isCausesOverlap |
Returns the state of the causes overlap flag.
| - (BOOL) isHideIfOverlapped |
Returns the state of the allow overlap flag.
| - (BOOL) isScaleWithDPI |
Returns the state of the scale with DPI flag.
| - (void) setAttachAnchorPointX: | (float) | attachAnchorPointX |
Sets the horizontal attaching anchor point of the billboard.
| attachAnchorPointX | The new horizontal attaching anchor point for the billboard. -1 means the left side, 0 the center and 1 the right side. The default is 0. |
| - (void) setAttachAnchorPointX: | (float) | attachAnchorPointX | |
| attachAnchorPointY: | (float) | attachAnchorPointY | |
Sets the attaching anchor point for the billboard. The attaching anchor point is
only used if the billboard is attached to another (base) billboard. It defines the point
on the base billboard where the attachable billboard will be placed.
| attachAnchorPointX | The new horizontal attaching anchor point for the billboard. -1 means the left side, 0 the center and 1 the right side. The default is 0. |
| attachAnchorPointY | The new vertical attaching anchor point for the billboard. -1 means the bottom, 0 the center and 1 the top. The default is 1. |
| - (void) setAttachAnchorPointY: | (float) | attachAnchorPointY |
Sets the vertical attaching anchor point of the billboard.
| attachAnchorPointY | The new vertical attaching anchor point for the billboard. -1 means the bottom, 0 the center and 1 the top. The default is 1. |
| - (void) setCausesOverlap: | (BOOL) | causesOverlap |
Sets the state of the causes overlap flag. If set to false the billboard will
never hide other billboards, even if they are overlapping and have the hide if overlapped flag
set to true. If set to true the billboard may hide other overlapping billboards that have the
hide if overlapped flag set to true and are located behind this billboard. This billboard may still
be hidden by other billboards in front of it, regardless of this parameter.
The default depends on the subclass.
| causesOverlap | The new state of the allow overlap flag. |
| - (void) setHideIfOverlapped: | (BOOL) | hideIfOverlapped |
Sets the state of the hide if overlapped flag. If set to false the billboard may be
hidden by other billboards that are overlapping with it and are located
in front of this billboard. If set to true the billboard will never
be hidden by other overlapping billboards. The default depends on the subclass.
| hideIfOverlapped | The new state of the allow overlap flag. |
| - (void) setHorizontalOffset: | (float) | horizontalOffset |
Sets the horizontal offset for the billboard. Horizontal offset is used to offset the bitmap
of the billboard horizontally relative to the billboard rotation. The units are the same as the
units used in the setSize method. Negative values offset the bitmap to the left and
positive values to the right. The default is 0.
| horizontalOffset | The new horizontal offset for the billboard. |
| - (void) setPlacementPriority: | (int) | placementPriority |
Sets the placement priority for the billboard. Higher priority billboard get drawn in front of lower
priority billboards regardless of their distance to the camera. If billboards are not allowed to overlap then
higher priority billboards hide overlapping lower priority billboards. The default is 0.
| placementPriority | The new placement priority for the billboard. |
| - (void) setScaleWithDPI: | (BOOL) | scaleWithDPI |
Sets the state of the scale with DPI flag. If set to true the billboard's size will scale using the screen
dots per inch parameter. This means that billboards will look the same size regardless of the device screen size
and density. If set to false the billboards will not be scaled with the screen density parameter, which means
that billboard will look smaller on on higher density screens. Custom Label and Popup implementations may,
but are not guaranteed to compensate for this by generating higher resolution images. The default depends on the subclass.
| scaleWithDPI | The new state of the scale with DPI flag. |
| - (void) setVerticalOffset: | (float) | verticalOffset |
Sets the vertical offset for the billboard. Vertical offset is used to offset the bitmap
of the billboard vertically relative to the billboard rotation. The units are the same as the
units used in the setSize method. Negative values offset the bitmap to the bottom and positive values to the top.
The default is 0.
| verticalOffset | The new vertical offset for the billboard. |
| + (NTBillboardStyleBuilder *) swigCreatePolymorphicInstance: | (void*) | cPtr | |
| swigOwnCObject: | (BOOL) | cMemoryOwn | |
Creates a polymorphic instance of the given native object. This is used internally by the SDK.
| cPtr | The native pointer of the instance. |
| cMemoryOwn | The ownership flag. |
Reimplemented from NTStyleBuilder.
Reimplemented in NTBalloonPopupStyleBuilder, NTPopupStyleBuilder, NTLabelStyleBuilder, NTTextStyleBuilder, and NTMarkerStyleBuilder.
| - (NSString *) swigGetClassName |
Returns the actual class name of this object. This is used internally by the SDK.
Reimplemented from NTStyleBuilder.
Reimplemented in NTBalloonPopupStyleBuilder, NTPopupStyleBuilder, NTLabelStyleBuilder, NTTextStyleBuilder, and NTMarkerStyleBuilder.
| - (void *) swigGetDirectorObject |
Returns the pointer to the connected director object. This is used internally by the SDK.
Reimplemented from NTStyleBuilder.
Reimplemented in NTBalloonPopupStyleBuilder, NTPopupStyleBuilder, NTLabelStyleBuilder, NTTextStyleBuilder, and NTMarkerStyleBuilder.


ENOUGH OF THE RHETORIC; SUNYANI DESERVES A PREMIER CLUB
Years of “what ifs” and “what could haves,” but as the adage goes, “kasa tenten nto ponko,” to wit, talking so much does not buy you a horse. The Brong Ahafo region is unquestionably famous as a hub for the production of sports talent in the country. From Athletics to boxing, women’s football to men’s football, BA is peerless.
The Brong Ahafo region currently boasts of the highest number of representatives in the country’s premier soccer competition, with Berekum Chelsea, Aduana Stars, Bechem United, and Techiman Eleven Wonders, all being BA based in Ghana’s sixteen-club premier league. Indeed, the current champions of the league, Aduana Stars, are also based in Dormaa in the Brong Ahafo region.
So dominant is the Brong Ahafo region in soccer in the country that the current champions of the women’s league, Ampem Darkoa, as well as the holders of the Sanford women’s FA Cup, Prisons ladies, are all based in Brong Ahafo. In spite of the overwhelming dominance of the Brong Ahafo region in Ghanaian football, it is regrettable to note that the capital of the region, Sunyani, cannot boast of a single premier league club.
As Paul J. Meyer puts it “Productivity is never an accident. It is always the result of commitment to excellence, intelligent planning, and focused effort.” The achievement of Aduana Stars in their short stint in Ghana football is a testament to the fact that, with the right systems and mechanisms in place, every team has the potential to be successful. There are four Sunyani based clubs in the ongoing first division league. While much cannot be demanded from sides like Nsoatreman FC and Young Apostles FC as a result of their relative inexperience in Ghana football, one cannot justify the mediocrity of BA United and Tano Bofoakwa.
This is the tenth consecutive season that the “asuo a 3yiri p3ber3” lads are competing in the first division since their relegation from the premier division back in 2007. For a club which finished fifth and competed in the maiden edition of the Ghalca Top 4 competition few seasons ago after the withdrawal of Kumasi Asante Kotoko, having produced great players such as Dan Owusu, a prolific goal scorer and a former Black Stars player who was the first player to have won the Ghana topflight league's goal king on three consecutive occasions in 1974, 1975 and 1976, Akwasi Owusu, another prolific goal poacher and a former skipper of the Black Stars, Yaw Antwi, Kojo Poku Junior, to mention but a few, Bofoakwa Tano’s plight is embarrassing.
Having been relegated in 2007, partly due to administrative lapses which saw the club lose points for using unapproved hose, Bofoakwa Tano have struggled to rediscover the status which once made them a dreaded force in Ghana football. Management after management, and CEO after CEO, have come and gone but the club still wallows in the lower echelons of Ghana Football. Clearly, whatever plans and strategies the club has adopted within the last couple of years hasn’t worked. New ideas and new direction is required. The obvious and most conspicuous challenge of the club has been the lack of continuity for Chief Executive Officers who have been tasked within the last few years to qualify the club to the elite division. Consistency and continuity are two commodities which are non- negotiable in association football.
“Strategy must have continuity. It can’t be constantly reinvented,” Michael Porter once said. If Bofoakwa Tano must rediscover their lost mettle, they certainly need some continuity. Founded in 1959, Brong Ahafo United is one of the oldest clubs in the country. Just as Bofoakwa Tano, BA United has produced great players, a list which includes ex Black Stars player, the late “King” George Arthur. Indeed BA United remains the biggest soccer brand in the Brong Ahafo region despite its current predicaments. Poor leadership and unhealthy politics have caused irreparable damage to BA United within the last 15 years, a situation which has seen the Sunyani giants spend 12 out of the last 15 years in the lower echelons of Ghana football. Currently in first division, under the leadership of former Bolton Wanderers star, Mustapha Riga, BA United hopes to rediscover their lost mettle, which once made them a dreaded club in the Ghanaian league.
With a divided supporting base, BA United have an arduous task of uniting their teaming folks, many of whom have become disenchanted with the club. It is instructive to also recognize the fact that some of the core and key supporters of BA United now have a divided loyalty as a result of the proliferation of soccer clubs in areas where these supporters hail from. BA United must come to terms with the reality; they don’t command the kind of support they used to some decades ago. However, that’s not the real problem. The real problem is that the club has no blueprint, no identity, no structures, and no definite route to success.
Bofoakwa Tano and BA United must wake up. The rhetoric must cease. Structures must work. Competent people must be put at the helm. Continuity and consistency must be embraced. The soccer fans in Sunyani need a premier league club. Enough of the excuses. The time for action is now.
“ Article Written By: ” — Akwasi Korang Oppong


Frustum
A frustum.
Constructor Summary
| Public Constructor | ||
| public |
Constructs a new frustum. |
Method Summary
| Public Methods | ||
| public |
Clones this frustum. |
|
| public |
containsPoint(point: Vector3): Boolean Checks if this frustum contains the given point. |
|
| public |
Copies a given frustum. |
|
| public |
intersectsBox(box: Box3): Boolean Checks if this frustum intersects with the given sphere. |
|
| public |
intersectsSphere(sphere: Sphere): Boolean Checks if this frustum intersects with the given sphere. |
|
| public |
Sets the planes of this frustum. |
|
| public |
setFromMatrix(m: Matrix4): Frustum this method was deprecated. Use setFromPerspectiveMatrix instead.
Sets this frustum based on a given projection matrix. |
|
| public |
Sets this frustum based on a given projection matrix. |
Public Constructors
Public Methods
public containsPoint(point: Vector3): Boolean source
Checks if this frustum contains the given point.
Params:
| Name | Type | Attribute | Description |
| point | Vector3 | A point. |
public copy(frustum: Frustum): Frustum source
Copies a given frustum.
Params:
| Name | Type | Attribute | Description |
| frustum | Frustum | A frustum. |
public intersectsBox(box: Box3): Boolean source
Checks if this frustum intersects with the given sphere.
Params:
| Name | Type | Attribute | Description |
| box | Box3 | A box. |
public intersectsSphere(sphere: Sphere): Boolean source
Checks if this frustum intersects with the given sphere.
Params:
| Name | Type | Attribute | Description |
| sphere | Sphere | A sphere. |
public set(p0: Plane, p1: Plane, p2: Plane, p3: Plane, p4: Plane, p5: Plane): Frustum source
Sets the planes of this frustum.


Summary of Data for the LiNi
0.5Mn
1.5O
4/Li Half-Cell at Different SODs at 20 °C
| SOD (%) |
OCV/20 °C |
d
E/d
T/mV K
–1
|
Δ
S/J K
–1 mol
–1
|
Δ
G/kJ mol
–1
|
Δ
H/kJ mol
–1
|
| 0 |
4.7336 |
–0.06 |
–6 |
–456.79 |
–458.548 |
| 10 |
4.7309 |
–0.061 |
–5.9 |
–456.53 |
–458.258 |
| 20 |
4.7251 |
–0.095 |
–9.2 |
–455.97 |
–458.665 |
| 30 |
4.7248 |
–0.123 |
–11.8 |
–455.94 |
–459.397 |
| 40 |
4.7184 |
–0.324 |
–31.2 |
–455.32 |
–464.461 |
| 50 |
4.6806 |
–0.178 |
–17.2 |
–451.67 |
–456.709 |
| 60 |
4.6742 |
–0.168 |
–16.2 |
–451.06 |
–455.806 |
| 70 |
4.6681 |
–0.191 |
–18.4 |
–450.47 |
–455.861 |
| 80 |
4.6589 |
–0.249 |
–24 |
–449.58 |
–456.612 |
| 85 |
4.4763 |
–2.788 |
–269 |
–431.96 |
–510.777 |
| 90 |
4.1264 |
–1.297 |
–125 |
–398.19 |
–434.815 |
| 100 |
3.7273 |
–0.954 |
–92 |
–359.68 |
–386.636 |


Question
option(1)
option(2)
option(3)
option(4)
Solution
Answer
Answer
Question1
Question2
Question3
Question4
Answer
Answer
Question1
Question2
Question3
Question4


--- layout: default nav: attributes > ic-indicator ---
ic-indicator
- The Indicator AttributeThe indicator attribute can be used to show an indicator while a request is in process.
The value of the attribute should be a valid selector of the indicator element to show
You can also use the ic-indicator
CSS class on elements within an element
to specify an indicator.
Finally, you can use the ic-indicator
attribute on a parent of multiple elements, and all
elements will use the parent indicator.
Here is a simple example of an indicator next to a button:
<button ic-post-to="/target_url" ic-indicator="#indicator"> Click Me! </button> <i id="indicator" class="fa fa-spinner fa-spin" style="display:none"></i>


Good morning, everyone!
👋
Agenda
- Optimizing
- Memory leaks
- Let's fix Toby's memory leaks!
-
Runtime performance
- Know your enemy
- Common issues
- Common techniques
- Let's improve Toby's performance!
Stop me at any time! 🔇
Runtime performance
- Load time and Run time
- Common aspects
- But this will be about runtime performance
Optimizing
When? What? How?
When should you optimize?
When it matters
Premature optimization is the root of all evil
When does performance matter?
When the user is really affected
on their device
with their data
When should you think about performance?
- post factum – when you have problems
- a priori – when you know you'll have problems
- a priori – when you make architecture decisions
- at all other times
What should you optimize?
What matters
& what can be improved
What should you optimize?
- look for things that take the longest
- look for things which block other things
- look for things which happen too often
- dev tools underline some mistakes
- gut feeling
How not to optimize?
- Unjustified micro optimizations
- When it's too risky (no tests? complexity?)
- Again, prematurely
- Again, when there's no chance
So, how should you optimize?
- start locally, think broadly
- know the code
- find the root cause
- avoid noise, keep your env tidy
- follow your gut feeling
- but verify your hypothesis (realistically!)
- be creative
- but avoid complexity
- don't fixate on one thing
- and know when to stop
- bonus: question self-proclaimed experts
Memory leaks
Garbage collector
-
Find unreachable objects
i.e. objects which cannot be accessed starting from a GC root
-
Remove them from the memory
Can we free it?
{
const foo = [];
document.body.addEventListener( 'click', () => {
console.log( 'hello!' );
} );
console.log( foo );
}
Can we free it?
{
const foo = [];
document.body.addEventListener( 'click', () => {
console.log( foo );
} );
console.log( foo );
}
Can we free it?
{
const foo = [];
const span = document.createElement( 'span' );
span.addEventListener( 'click', () => {
console.log( foo );
} );
console.log( foo );
}
Can we free it?
<script>
foo = [];
span = document.createElement( 'span' );
span.addEventListener( 'click', () => {
console.log( foo );
} );
console.log( foo );
</script>
Garbage collector
- Implemented by the browsers
- Browsers make decisions when to run it
- GC pauses (it's synchronous)
- Minor GC, major GC, DOM GC
- Can be expensive
- Differs between browsers, changes with time
When does memory leak?
- leaked globals
- globals referring to your objects
- listeners on globals (and objects referenced by globals)
- timeouts/intervals
Demo time!
Anecdote
class MyApp {
// ... lots of code here
destroy() {
// Deallocating memory...
this.foo = null;
this.bar = null;
this.boom = null;
}
}
Let's fix Toby!
Test:
- Scrolling
- Using and destroying the app
- Init & destroy
Runtime performance
- Scripting
- Styles, layout
- Painting
Your goal
- responsive and smooth experience
- ideally 60FPS
- 1000ms / 60 = 16.6ms per frame
- script + styles + layout + paint
- but it's not a rule
Know your enemy
- Browser mechanisms
- Common issues
- Common techniques
DOM
Memory
- Avoid major GC pauses
- Less allocations
- Recycle objects
Keep it smooth
- Aim for short sync chunks
- Reduce paint time – promote things which change frequently to layers
- Reduce layer management time (updating layer tree and compositing layers)
requestAnimationFrame()
- Split long chunks with timeouts or rAF
- Delay non-critical stuff (sync -> async execution)
- Do stuff less often – throttling, debouncing
Demo time!
Let's improve Toby!
Note: You can append #0, #1, #2 to the URL to get different data sets. The #* below indicate in which sample which technique is best visible.
- cache/memoization #2
- web workers #2
- delay non-critical stuff #2
- batch DOM changes #1
- clone elements #1
- recycle elements #1
- avoid pitfalls like setting innerHTML #*
- requestAnimationFrame #*
- throttling #*


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| Collector and Base values are
set using integers entered into the spin edit boxes. Collector and Base
integers are divided by 100 then assigned the
closest DAC (digital to analog converter) voltage. For Base
current, the integer is divided by 10 to obtain the DAC value in uA.
The data is sent via the DA0 or DA1 command to the Mini_CT interface.
Clicking Set Collector V/100 sends the value to the Collector voltage DAC and clicking Set Base V/100 or Set Base I uA/10 sends the value to the Base Voltage DAC. If the Base switch is in the current position, only the Set Base I uA/10 button is enabled. If the Base switch is in the voltage position, only the Set Base V/100 button is enabled. When the Set Collector V/100 button is pressed, Mini_CT is commanded to stop generating the continuous AC waveform. The collector votlage is then a static set value. Use the Read Voltages button to measure values in the static state. Running a sweep with the Run Sweep button will disable the static collector voltage. |


App API¶
The Model class¶
-
class
flexx.app.
Model
(*init_args, **kwargs)¶ Subclass of HasEvents representing Python-JavaScript object models.
Each instance of this class has a corresponding object in JavaScript. Events are transparently handled accross the language barrier. To avoid unnecessary communication, only events for which there are handlers at the other side are synchronized.
The JS version of this class is defined by the contained
JS
class. One can define methods, properties, handlers, and (json serializable) constants on the JS class.One can also make use of a contained
Both
class to define things that will be present in both Python and JS. This is intended primarily for defining properties, which can be set on both ends, and which get automatically synchronised.The
init()
method on both the Python and JS side can be used to do initialization at a time when properties have their initial values, but handlers are not yet initialized and events are not yet emitted. When a Model instance is assigned as an attribute to the Python instance (inside the init() method), the corresponding attribute will also be present at the JavaScript side.Initialization order and life cycle:
- An id and session are associated with the model.
- The default/initial values for the properties are set.
- The init() is called. You can get/set properties and attributes here.
- The handlers are connected. You can use properties here, as well as attributes set in init(). Handlers connected to events that correspond to a property receive an event to communicate the initial value (unless that property does not have a value yet).
- On the JavaScript side the same order applies. The creation of the JavaScript object occurs after the Python object is created.
- The JavaScript part of a Model is not garbadge collected, but removed when the Python side object is deleted or disposed using dispose().
- The Python part of a model is garbadge collected as usual. Note that handlers hold references to the objects that they connect to.
- Note that the Widget class has a mechanism to avoid being deleted when it is temporarily not referenced due to jitter in the children property.
Models can be used as a context manager to make new Model objects created inside such a context to share the same session. The
init()
method is invoked in the context of the object itself.The typical way to use a model is do define properties (preferably in the Both “subclass”) and events, and react to these by writing handlers at the side where the action should be taken. See the example below or many of the examples of the Flexx documentation.
パラメータ: - session (Session, None) – the session object that connects this instance to a JS client. If not given, will use the session of a currently active model (i.e. as a context manager).
- is_app (bool) – whether this object is the main app object. Set by Flexx internally. Not used by the Model class, but can be used by subclasses.
- kwargs – initial property values (see HasEvents).
Notes
This class provides the base object for all widget classes in
flexx.ui
. However, one can also create subclasses that have nothing to do with user interfaces or DOM elements.Example
class MyModel(Model): @event.connect('foo') def handle_changes_to_foo_in_python(self, *events): ... class Both: @event.prop def foo(self, v=0): return float(v) class JS: BAR = [1, 2, 3] def handle_changes_to_foo_in_js(self, *events): ...
-
dispose
()¶ Overloaded version of dispose() that removes the global reference of the JS version of the object.
-
id
¶ The unique id of this Model instance.
-
init
()¶ Can be overloaded when creating a custom class to do initialization, such as creating sub models. This function is called with this object as a context manager (the default context is a stub).
-
send_data
(data, meta=None)¶ Send data to the JS side, where
retreive_data()
will be called, which will eventually callreceive_data()
with the corresponding data and meta data.AJAX is used to retrieve the data. In the future we may want to use a dedicated binary websocket for better performance.
パラメータ: - data (bytes, str) – the data blob. Can also be a URL (a string starting with “http://”, “https://”, “/flexx/data/” or “_data/”) where the client can download the data from.
- meta (dict, optional) – information associated with the data that the JS side can use to interpret the data. This function will add an “id” field to the meta data.
-
session
¶ The session object that connects us to the runtime.
-
sync_props
¶ property – Whether properties are synchronised from JS to Python. This can be set to
False
if a model has properties that change a lot, but are not of interest for the Python side. Note that events are still synchronised if there is a Python handler.
Session and Assets¶
An asset is represented using an Asset
object that defines its sources,
dependencies, etc. Assets can be shared or specific to the session.
The AssetStore provides all shared assets for clients connected to the current
process. The global store is at flexx.app.assets
.
The session object handles the connection between Python and the JavaScript,
and it allows adding client-side assets, which for instance makes it
easy to create extensions based on existing JS libraries.
-
class
flexx.app.
Asset
(name, source=None)¶ Class to represent an asset (JS or CSS) to be included on the page. Users will typically use
app.assets.add_shared_asset()
, see the corresponding docs for details.-
name
¶ The (file) name of this asset.
-
remote
¶ Whether the asset is remote (client will load it from elsewhere). If True, the source specifies the URL.
-
source
¶ The source for this asset. Can be str, URL or callable.
-
to_html
(path='{}', link=3)¶ Get HTML element tag to include in the document.
パラメータ: - path (str) – the path of this asset, in which ‘{}’ can be used as a placeholder for the asset name.
- link (int) –
whether to link to this asset:
- 0: the asset is embedded.
- 1: normal assets are embedded, remote assets remain remote.
- 2: the asset is linked (and served by our server).
- 3: (default) normal assets are linked, remote assets remain remote.
-
to_string
()¶ Get the string code for this asset. Even for remote assets.
-
-
class
flexx.app._assetstore.
AssetStore
¶ Provider of shared assets (CSS, JavaScript) and data (images, etc.). Keeps track of JSModules and makes them available via asset bundles. The global asset store object can be found at
flexx.app.assets
. Assets and data in the asset store can be used by all sessions. Each session object also keeps track of data.Assets with additional JS or CSS to load can be used simply by creating/importing them in a module that defines the Model class that needs the asset.
Add an asset to the store so that the client can load it from the server. Users typically only need this to provide an asset without loading it in the main page, e.g. when the asset is loaded by a secondary page, a web worker, or AJAX.
パラメータ: - name (str) – the asset name, e.g. ‘foo.js’ or ‘bar.css’. Can contain slashes to emulate a file system. e.g. ‘spam/foo.js’. If a URL is given, both name and source are implicitly set (and its a remote asset).
- source (str, function) –
the source for this asset. Can be:
- The source code.
- A URL (str starting with ‘http://‘ or ‘https://‘),
making this a “remote asset”. Note that
app.export()
provides control over how (remote) assets are handled. - A funcion that should return the source code, and which is called only when the asset is used. This allows defining assets without causing side effects when they’re not used.
戻り値: the (relative) url at which the asset can be retrieved.
戻り値の型:
Add data to serve to the client (e.g. images), which is shared between sessions. It is an error to add data with a name that is already registered. See
Session.add_data()
to set data per-session and Model.send_data()` to send data to Model objects directly.パラメータ: - name (str) – the name of the data, e.g. ‘icon.png’.
- data (bytes) – the data blob.
戻り値: the (relative) url at which the data can be retrieved.
戻り値の型:
-
associate_asset
(mod_name, asset_name, source=None)¶ Associate an asset with the given module. The assets will be loaded when the module that it is associated with is used by JavaScript. Multiple assets can be associated with a module, and an asset can be associated with multiple modules.
The intended usage is to write the following inside a module that needs the asset:
app.assets.associate_asset(__name__, ...)
.パラメータ: - mod_name (str) – The name of the module to associate the asset with.
- asset_name (str) – The name of the asset to associate. Can be an already registered asset, or a new asset.
- source (str, callable, optional) – The source for a new asset. See
add_shared_asset()
for details. It is an error to supply a source if the asset_name is already registered.
戻り値: the (relative) url at which the asset can be retrieved.
戻り値の型:
-
export
(dirname, clear=False)¶ Write all shared data and used assets to the given directory.
パラメータ: - dirname (str) – the directory to export to. The toplevel directory is created if necessary.
- clear (bool) – if given and True, the directory is first cleared.
-
get_asset
(name)¶ Get the asset instance corresponding to the given name or None if it not known.
-
get_asset_names
()¶ Get a list of all asset names.
-
get_associated_assets
(mod_name)¶ Get the names of the assets associated with the given module name. Sorted by instantiation time.
-
get_data
(name)¶ Get the data (as bytes) corresponding to the given name or None if it not known.
-
get_data_names
()¶ Get a list of all data names.
-
modules
¶ The JSModule objects known to the asset store. Each module corresponds to a Python module.
-
update_modules
()¶ Collect and update the JSModule instances that correspond to Python modules that define Model classes. Any newly created modules get added to all corresponding assets bundles (creating them if needed).
It is safe (and pretty fast) to call this more than once since only missing modules are added. This gets called automatically by the Session object.
-
class
flexx.app.
Session
(app_name, store=None)¶ A session between Python and the client runtime. This class is what holds together the app widget, the web runtime, and the websocket instance that connects to it.
Responsibilities:
- Send messages to the client and parse messages received by the client.
- Keep track of Model instances associated with the session.
- Ensure that the client has all the module definitions it needs.
- Allow the user to send data to the client.
-
add_data
(name, data)¶ Add data to serve to the client (e.g. images), specific to this session. Returns the link at which the data can be retrieved. See
Session.send_data()
for a send-and-forget mechanism, andapp.assets.add_shared_data()
to provide shared data.パラメータ: - name (str) – the name of the data, e.g. ‘icon.png’. If data has already been set on this name, it is overwritten.
- data (bytes) – the data blob.
戻り値: the (relative) url at which the data can be retrieved.
戻り値の型:
-
app
¶ The Model instance that represents the app.
-
app_name
¶ The name of the application that this session represents.
-
assets_to_ignore
¶ The set of names of assets that should not be pushed to the client, e.g. because they are already present on the page. Add names to this set to prevent them from being loaded.
-
close
()¶ Close the session: close websocket, close runtime, dispose app.
-
eval
(code)¶ Evaluate the given JavaScript code in the client
Intended for use during development and debugging. Deployable code should avoid making use of this function.
Gets the value of the cookie with the given name, else default. Note that cookies only really work for web apps.
-
get_data
(name)¶ Get the data corresponding to the given name. This can be data local to the session, or global data. Returns None if data by that name is unknown.
-
get_data_names
()¶ Get a list of names of the data provided by this session.
-
get_model_instance_by_id
(id)¶ Get instance of Model class corresponding to the given id, or None if it does not exist.
-
id
¶ The unique identifier of this session.
-
keep_alive
(ob, iters=4)¶ Keep an object alive for a certain amount of time, expressed in Python-JS ping roundtrips. This is intended for making Model objects survive jitter due to synchronisation, though any type of object can be given.
-
present_modules
¶ The set of module names that is (currently) available at the client.
-
remove_data
(name)¶ Remove the data associated with the given name. If you need this, also consider
send_data()
. Also note that data is automatically released when the session is closed.
-
runtime
¶ The runtime that is rendering this app instance. Can be None if the client is a browser.
Sets the given cookie name/value with the given options. Set value to None to clear. The cookie value is secured using flexx.config.cookie_secret; don’t forget to set that config value in your server. Additional keyword arguments are set on the Cookie.Morsel directly.
-
status
¶ The status of this session. The lifecycle for each session is –
- status 1: pending
- statys 2: connected
- status 0: closed


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models package¶
Submodules¶
models.train_classifier module¶
-
models.train_classifier.
build_model
()[source]¶ Build the ML model.
Returns: sklearn multioutput classifer model. Return type: model
-
models.train_classifier.
evaluate_model
(model, X_test, Y_test, category_names)[source]¶ Function to evaluate model predictions on the test set and print classification metrics.
Parameters: - model (sklearn model) – sklearn classification model trained on the training set.
- X_test (np.array) – Test set features.
- Y_test (np.array) – Test set targets.
- category_names (list) – List of category names for each target.
Returns: Return type: None
-
models.train_classifier.
load_data
(database_filepath)[source]¶ Load data from the database.
Parameters: database_filepath (str) – Database filepath. Returns: Tuple of features, targets and target names. Return type: tuple
-
models.train_classifier.
round_list
(x, n=2)[source]¶ Auxiliary function to round elements of a list to n decimal places.
Parameters: - x (list) – List of float values.
- n (int) – Number of decmial places to round the elements of list.
Returns: List with elements rounded to n decimal places.
Return type: list


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Treasure Island
by Robert Louis Stevenson
Part Four: The Stockade, Chapter 20: Silver’s Embassy
Additional Information
- Year Published: 1883
- Language: English
- Country of Origin: England
- Source: Stevenson, R. L. (1883). Treasure Island. London, England: Cassell and Co.
-
Readability:
- Flesch–Kincaid Level: 7.0
- Word Count: 2,201
- Genre: Adventure
- ✎ Cite This
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Sure enough, there were two men just outside the stockade, one of them waving a white cloth, the other, no less a person than Silver himself, standing placidly by.
It was still quite early, and the coldest morning that I think I ever was abroad in—a chill that pierced into the marrow. The sky was bright and cloudless overhead, and the tops of the trees shone rosily in the sun. But where Silver stood with his lieutenant, all was still in shadow, and they waded knee-deep in a low white vapour that had crawled during the night out of the morass. The chill and the vapour taken together told a poor tale of the island. It was plainly a damp, feverish, unhealthy spot.
“Keep indoors, men,” said the captain. “Ten to one this is a trick.”
Then he hailed the buccaneer.
“Who goes? Stand, or we fire.”
“Flag of truce,” cried Silver.
The captain was in the porch, keeping himself carefully out of the way of a treacherous shot, should any be intended. He turned and spoke to us, “Doctor’s watch on the lookout. Dr. Livesey take the north side, if you please; Jim, the east; Gray, west. The watch below, all hands to load muskets. Lively, men, and careful.”
And then he turned again to the mutineers.
“And what do you want with your flag of truce?” he cried.
This time it was the other man who replied.
“Cap’n Silver, sir, to come on board and make terms,” he shouted.
“Cap’n Silver! Don’t know him. Who’s he?” cried the captain. And we could hear him adding to himself, “Cap’n, is it? My heart, and here’s promotion!”
Long John answered for himself. “Me, sir. These poor lads have chosen me cap’n, after your desertion, sir”—laying a particular emphasis upon the word “desertion.” “We’re willing to submit, if we can come to terms, and no bones about it. All I ask is your word, Cap’n Smollett, to let me safe and sound out of this here stockade, and one minute to get out o’ shot before a gun is fired.”
“My man,” said Captain Smollett, “I have not the slightest desire to talk to you. If you wish to talk to me, you can come, that’s all. If there’s any treachery, it’ll be on your side, and the Lord help you.”
“That’s enough, cap’n,” shouted Long John cheerily. “A word from you’s enough. I know a gentleman, and you may lay to that.”
We could see the man who carried the flag of truce attempting to hold Silver back. Nor was that wonderful, seeing how cavalier had been the captain’s answer. But Silver laughed at him aloud and slapped him on the back as if the idea of alarm had been absurd. Then he advanced to the stockade, threw over his crutch, got a leg up, and with great vigour and skill succeeded in surmounting the fence and dropping safely to the other side.
I will confess that I was far too much taken up with what was going on to be of the slightest use as sentry; indeed, I had already deserted my eastern loophole and crept up behind the captain, who had now seated himself on the threshold, with his elbows on his knees, his head in his hands, and his eyes fixed on the water as it bubbled out of the old iron kettle in the sand. He was whistling “Come, Lasses and Lads.”
Silver had terrible hard work getting up the knoll. What with the steepness of the incline, the thick tree stumps, and the soft sand, he and his crutch were as helpless as a ship in stays.  He was tricked out in his best; an immense blue coat, thick with brass buttons, hung as low as to his knees, and a fine laced hat was set on the back of his head.
 “You had better sit down.”
“You ain’t a-going to let me inside, cap’n?” complained Long John. “It’s a main cold morning, to be sure, sir, to sit outside upon the sand.”
“Why, Silver,” said the captain, “if you had pleased to be an honest man, you might have been sitting in your galley. It’s your own doing. You’re either my ship’s cook—and then you were treated handsome—or Cap’n Silver, a common mutineer and pirate, and then you can go hang!”
“Well, well, cap’n,” returned the sea-cook, sitting down as he was bidden on the sand, “you’ll have to give me a hand up again, that’s all. A sweet pretty place you have of it here. Ah, there’s Jim! The top of the morning to you, Jim. Doctor, here’s my service. Why, there you all are together like a happy family, in a manner of speaking.”
“If you have anything to say, my man, better say it,” said the captain.
“Right you were, Cap’n Smollett,” replied Silver. “Dooty is dooty, to be sure.  I don’t deny it was a good lay. Some of you pretty handy with a handspike-end. And I’ll not deny neither but what some of my people was shook—maybe all was shook; maybe I was shook myself; maybe that’s why I’m here for terms. But you mark me, cap’n, it won’t do twice, by thunder! We’ll have to do sentry-go and ease off a point or so on the rum. Maybe you think we were all a sheet in the wind’s eye. But I’ll tell you I was sober; I was on’y dog tired; and if I’d awoke a second sooner, I’d ‘a caught you at the act, I would. He wasn’t dead when I got round to him, not he.”
“Well?” says Captain Smollett as cool as can be.
All that Silver said was a riddle to him, but you would never have guessed it from his tone. As for me, I began to have an inkling. Ben Gunn’s last words came back to my mind. I began to suppose that he had paid the buccaneers a visit while they all lay drunk together round their fire, and I reckoned up with glee that we had only fourteen enemies to deal with.
“Well, here it is,” said Silver. “We want that treasure, and we’ll have it—that’s our point!  You have a chart, haven’t you?”
“That’s as may be,” replied the captain.
“Oh, well, you have, I know that,” returned Long John. “You needn’t be so husky with a man; there ain’t a particle of service in that, and you may lay to it. What I mean is, we want your chart. Now, I never meant you no harm, myself.”
“That won’t do with me, my man,” interrupted the captain. “We know exactly what you meant to do, and we don’t care, for now, you see, you can’t do it.”
And the captain looked at him calmly and proceeded to fill a pipe.
“If Abe Gray—” Silver broke out.
“Avast there!” cried Mr. Smollett. “Gray told me nothing, and I asked him nothing; and what’s more, I would see you and him and this whole island blown clean out of the water into blazes first. So there’s my mind for you, my man, on that.”
This little whiff of temper seemed to cool Silver down. He had been growing nettled before, but now he pulled himself together.
“Like enough,” said he. “I would set no limits to what gentlemen might consider shipshape, or might not, as the case were. And seein’ as how you are about to take a pipe, cap’n, I’ll make so free as do likewise.”
And he filled a pipe and lighted it; and the two men sat silently smoking for quite a while, now looking each other in the face, now stopping their tobacco, now leaning forward to spit. It was as good as the play to see them.
“Now,” resumed Silver, “here it is. You give us the chart to get the treasure by, and drop shooting poor seamen and stoving of their heads in while asleep. You do that, and we’ll offer you a choice.  Or if that ain’t to your fancy, some of my hands being rough and having old scores on account of hazing, then you can stay here, you can.  Now, you’ll own that’s talking. Handsomer you couldn’t look to get, now you. And I hope”—raising his voice—”that all hands in this here block house will overhaul my words, for what is spoke to one is spoke to all.”
Captain Smollett rose from his seat and knocked out the ashes of his pipe in the palm of his left hand.
“Is that all?” he asked.
“Every last word, by thunder!” answered John. “Refuse that, and you’ve seen the last of me but musket-balls.”
“Very good,” said the captain. “Now you’ll hear me. If you’ll come up one by one, unarmed, I’ll engage to clap you all in irons and take you home to a fair trial in England. If you won’t, my name is Alexander Smollett, I’ve flown my sovereign’s colours, and I’ll see you all to Davy Jones. You can’t find the treasure. You can’t sail the ship—there’s not a man among you fit to sail the ship. You can’t fight us—Gray, there, got away from five of you. Your ship’s in irons, Master Silver; you’re on a lee shore, and so you’ll find. I stand here and tell you so; and they’re the last good words you’ll get from me, for in the name of heaven, I’ll put a bullet in your back when next I meet you. Tramp, my lad. Bundle out of this, please, hand over hand, and double quick.”
 He shook the fire out of his pipe.
“Give me a hand up!” he cried.
“Not I,” returned the captain.
“Who’ll give me a hand up?” he roared.
Not a man among us moved. Growling the foulest imprecations, he crawled along the sand till he got hold of the porch and could hoist himself again upon his crutch. Then he spat into the spring.
“There!” he cried. “That’s what I think of ye.  Laugh, by thunder, laugh!  Them that die’ll be the lucky ones.”
And with a dreadful oath he stumbled off, ploughed down the sand, was helped across the stockade, after four or five failures, by the man with the flag of truce, and disappeared in an instant afterwards among the trees.


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jQuery timeline control with support for stacking events.
$('.eventcontrol').EventControl({ oncreate: function(item, element) { // Called when creating the item. // Can set attributes on the element here, // for example: element.css('color', 'red'); }, onhover: function(item, element, event, inout) { // Called when mouse hovers over an item // inout is 'in' when entering, and 'out' when exiting. }, onclick: function(item, element, event) { // Called when an item is left-clicked. }, data: [], // An array of objects with a timestamp key. hammertime: true, // Enable use of hammer.js to support touch devices items_height: 101, // height in px of item/event area markers_height: 31, // height in px of markers area displayUTC: false, // Show timestamps as UTC, else local time });
Once created, the EventControl object can be accessed as demonstrated below. Right now, there is no support for updating the dataset, I plan to add this later.
var state = $('.eventcontrol').EventControl(); // save state $('.eventcontrol').EventControl(state); // restore state // zoom in / out: focus is (0 - 1), optional, default is 0.5 $('.eventcontrol').EventControl('zoom-in', focus); $('.eventcontrol').EventControl('zoom-out', focus);
The library can optionally use hammer.js to support basic touch controls. Supporting pinch to zoom interferes with all kinds of functionality, so you'll probably want to hook up zoom in/out to separate controls.


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Background
After reading the previous article, the follow up question would be when to buy. Luckily, we can use the buyback mechanism as a good entry point barometer and also a stand alone trading strategy. We know there is a buyback that starts after 10pm HKT each Monday and ends before 11:59pm HKT Tuesday. In these 26 hours, FTX buys back $FTT on the open market giving it synthetic buy pressure, so it is ideal to buy right before this period.
Basic Trading Strategy
The first buyback was on 08/01/2019 and there have been about 90 more since then1. By creating a simple strategy that buys $FTT at the initial buyback period and sells as the period ends, we can see how much edge there is when executing before this period. Below is the cumulative return of this period with an average of over 2% per day and a total of over 4x in around 85 days.
Trading Strategy Tweaks
Timing Improvement
There are ways to just make money trading this strategy, but adding a few more bells and whistles to make this strategy more lucrative. One of these possible strategy enhancements is to stalk the network to see when the burn occurs and end the trade at that moment, reducing unnecessary delta exposure to the market2.. We are able to track the buybacks by looking at large burn transactions. So instead of closing the trade at 11:59pm HKT, we close whenever the burn concludes.
Buy Back Size
Buybacks can be tracked by the either on etherscan or also on the burn page. After normalizing (in USD) for the size of the burn, we can run correlations3 to see that there is a strong positive relationship (.36) between the size of the burn and the resulting performance. A trading strategy would be to size up when buy is large and size down when burn is small. Breaking down the USD burn size into quantiles, the following strategy is run: if the burn size is in the upper 75% we 2x the size, bottom 25% half size, and we keep same size for middle two quantiles.
Below are risk adjusted stats of the baseline and the various strategy tweaks. We see that the baseline is very strong with an average of 2.3% gain and high sharpe/sortino ratios. The pnl is skewed right as the average winner is higher than the average loser. All in all a very powerful trade. Looking at our adjustments, we can see that conditioning trading size on burn size is positive expected value.  However, the timing adjustment does not seem to help the strategy at all and decreases performance in both outright pnl and risk adjusted metrics. Perhaps there is a momentum effect after this day and cutting off at the burn time does not properly capture the residual momentum.
| Baseline | Sizing | Timing | |
|---|---|---|---|
| Mean | 0.023 | 0.032 | 0.019 |
| Sharpe | 3.990 | 4.830 | 3.630 |
| Sortino | 15.330 | 12.920 | 11.660 |
| Win% | 0.610 | 0.610 | 0.610 |
| u_win | 0.050 | 0.070 | 0.050 |
| u_lose | -0.030 | -0.020 | -0.030 |
| best | 0.730 | 0.730 | 0.630 |
| worst | -0.100 | -0.190 | -0.090 |
Conclusion
A great time to buy $FTT is right before the buyback period (10pm HKT on Mondays). The rest of the article examines a basic strategy based on market microstructure and shows the impact of simple tweaks on strategy performance. There are out sized returns during this specific time period because of the mechanics of the $FTT coin. Knowing specific details of how other coins behave can help uncover similar trades to this one.
An extension of this strat to get even more risk neutral would be to short other centralized exchange coins like $BNB, $HT, $LEO, and $KCS in which case it is a pure play on this buyback.
- This article uses data until mid March 2021. ↩
- One week in August 2020, burn occurred on 08/14/2020 instead of usual 08/11/2020. ↩
- Spearman is used which better accounts for nonlinearity. I believe this would be more accurate here as there are often out-sized momentum moves. ↩


This is the placeholder for my JSDocs generated documentation.
If you ended up here, you most likely wanted to go here:
http://blog.codelamp.uk/theory/docs/html/theory/0.5.0


Python Systems Engineer - San Francisco, CA 94105
Simple is better than complex. Complex is better than complicated… practicality beats purity. Errors should never pass silently. Unless explicitly silenced. – from the Zen of Python
At Insight Engines, we're doing the hard work so our customers don't have to. Our goal is to get the right data into the right structure, turn it into information, then process that information into something accessible for humans to gain insights that weren't possible before. We create and use natural language technologies to make complex data systems more accessible, understandable, and usable for more people. By integrating data systems and natural language models with APIs, we create powerful, easy to use products.
But enough about us, let's talk about you. Do you enjoy writing scalable code in Python? Designing clean object-oriented components and/or HTTP APIs? Learning new technology areas such as natural language processing and machine learning? As an integral part of our technology team, you will work on our core Python systems, including data pipelines, web APIs, and our natural language query engine. You'll integrate various systems, optimize performance, and develop reliable data-driven architectures and applications.
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Indexing, understanding, and normalizing messy data to enable high-performance analytics
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Optimizing database queries and surrounding code for efficient real-time processing
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Scaling and maintaining data processing pipelines
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Crafting easy-to-use APIs for machine learning, natural language, and data visualization applications
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Leveraging existing open source technologies like Kafka, Druid, Spark, PostgreSQL, Elastic, and other tools
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Making data more accessible using natural language technologies
Technologies we're using at Insight Engines:
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Python for natural language, search, and data processing
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Go for data processing and frontend APIs
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High-performance time series, text search, and relational databases
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All deployed on Kubernetes
When applying, please tell us about some of the real-world Python systems and applications you have worked on.
Women, People of Color, Minorities, and LGBTQ candidates are encouraged to apply.
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Strong Computer Science fundamentals (CS or relevant 4-year technical degree a plus)
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3+ years of Python software development
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Familiar with at least one database query language, such as SQL, or with NoSQL storage systems like Elastic or Redis
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Use engineering best practices - deliver high code quality, automated testing, and build reusable components
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Cloud deployment experience on AWS, Azure, GCP, or similar platform
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Authorized to work in the United States
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Open vacation policy
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Health care insurance
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Dental & vision insurance
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Life insurance
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Short-term & long-term disability insurance
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Health care FSA
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Transit & parking FSA
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Free lunch at the SF office
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Flexible work hours
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Holiday time off
New hires must present within 3 days of starting the required documentation proving their ability to legally work in the USA. Insight Engines, Inc. is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, gender expression, national origin, disability, protected veteran status, or any other basis protected by applicable federal, state, or local law.
GrmWA0IWly


--- layout: none title: Limbo ---
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--- layout: page title: About header-img: "img/about-bg.png" ---
Professional musician (French horn) and educator, amateur linguist, fledgling programmer. Jack of all trades, master of some. Foodie, world traveler, occasional outdoorsman. Curious, capricious, cosmopolitan. MBTI Type - ENTP. Lover of dogs.


CHARLIE CHAN IN THE SECRET SERVICE (director: Phil Rosen; screenwriter: George Callahan; cinematographer: Ira Morgan; editor: Martin Cohen; cast: Sidney Toler (Charlie Chan), George J. Lewis (Paul Arranto), Arthur Loft (Inspector Jones ), Gwen Kenyon (Inez Arranto), Gene Roth ( Luis Philipe Vega/Philip Von Vega), Muni Seroff (Peter Laska), Marianne Quon (Iris Chan), Benson Fong (Tommie Chan, #3 Son), Lelah Tyler (Mrs. Winters/Fraulein Manlich), Sarah Edwards (Mrs. Hargue, Housekeeper), Mantan Moreland (Birmingham Brown); Runtime: 63; Monogram; 1944)
Reviewed by Dennis Schwartz
A fairly entertaining Charlie Chan mystery, but with the new studio Monogram taking over for 20th Century Fox the production values were much cheaper. When an inventor of an important torpedo plan is murdered in his home while being guarded by Secret Service agents, Charlie Chan (Toler), who is made an agent of the United States government, is called in to investigate. He's aided, without requesting them, by his Number Three Daughter, Iris (Quon), and Number Two Son, Tommie (Fong).
 All the house guests and the housekeeper, Mrs. Hargue (Edwards), become suspects. Paul Arranto (Lewis) is in a wheelchair, but it's soon evident he can walk. His sister Inez (Kenyon), was the first to find the body and the housekeeper says she was going through the vic's pockets. Peter Laska is employed by Paul, and is very nervous. David Blake works for the Department of Economics, and is arrogant. Mrs.  She brings a gift of a minature Statue of Liberty, as she keeps asking to leave because she wants to feed her pet dog. Luis Philipe Vega is a refugee from Smyrna who says he's a salesman, but his real name is Philip Von Vega and he's an electrical engineer.
Charlie becomes the killer's target twice, but he is able to use those failed attempts to get more clues to pin the murder of the inventor on Vega. But when Vega is killed by a gun mounted on the wall that is fired by a magnet releasing the trigger from another part of the room, Charlie deduces who his killer is and who has the torpedo plans on them.
Birmingham Brown (Moreland) is the wisecracking chauffeur of Mrs. Winters who helps Charlie's kids in their investigation, while Inspector Jones (Loft) is also able to be of some mild assistance to Charlie. It wasn't too difficult to pick out the spy, but nevertheless the film was still pleasing in spots.
REVIEWED ON 9/9/2001 GRADE: C
Dennis Schwartz: "Ozus' World Movie Reviews"
http://www.sover.net/~ozus
<EMAIL_ADDRESS>© ALL RIGHTS RESERVED DENNIS SCHWARTZ
========== X-RAMR-ID: 29426 X-Language: en X-RT-SourceID: 873 X-RT-AuthorID: 1315 X-RT-RatingText: C
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Static Media Manager v0.4 documentation
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Murder contract
Witness names hitmen in former JUTC chairman's killing
by RACQUEL PORTERA State witness in the trial against Tesha Miller yesterday explained how he knew that the killing of then Jamaica Urban Transit Company (JUTC) chairman Douglas Chambers was a hit, and who had killed him.
The witness, who is being referred to as Witness One by the Jamaica Observer because the court instructed that all witnesses remain anonymous, testified during his evidence-in-chief that Miller told him face-to-face that Douglas's killing was a contract.
During the trial's morning session, Witness One testified that he was standing at a stall across from the JUTC depot in Spanish Town, St Catherine when he allegedly saw “Blackman and Bruckie” exit a motor vehicle and fired at Chambers.
Although he said both men carried out the execution, he admitted that he was unable to see Blackman's face because he was wearing a black pullover.
However, the witness said he knew it was him because he had handed over two guns to Blackman and Bruckie prior to the killing.
On Wednesday, the witness testified that he was instructed to create a diversion group a day before the JUTC chairman was murdered.
Yesterday, he confessed that he was a member of the diversion group and that after he handed over the guns to “Blackman”, he went for his gun and placed it on his waist before meeting up with other members.
He further confessed that after Chambers was shot, he “started to fire whole heap a shot in the air, so di shot dat we fire in di air [was] to scare the people that were coming out so dat di man dem could escape”.
The prosecutor asked him for how long was he firing the shots.
“Not for very long,” he replied.
Chambers was shot dead at the JUTC depot in Spanish Town on June 27, 2008, after he had left a meeting to smoke a cigarette outside.
According to police reports, two men armed with a high-powered rifle and a .45 calibre handgun shot Chambers repeatedly in the head.
During the afternoon session of the trial, the witness told the court that when he asked Miller about Blackman's whereabouts the following day, because he had not seen him since the incident, Miller told him that he had sent him on a boat to the Cayman Islands.
Miller is charged with accessory to murder before and after the fact.
The trial, which began in the Home Circuit Court on Wednesday, is scheduled to continue today.


TRANCE (United States) A review by Mark R. Leeper in bullet-list form from the Toronto Internation Film Festival
CAPSULE: This is the kind of film you used to see in the 60s from small studios like Tigon. An American couple finds themselves in a huge old Irish house with a mad woman stalking the hallways, and, oh yes, a 2000-year-old Druid witch is also running around and shape- changing. Once it gets going it is entertaining but it would be hard to claim it is actually a good film. Rating: 5 (0 to 10), low +1 (-4 to +4)
- Written and directed by Michael Almereyda who directed the vampire film NADJA. - Far less experimental than NADJA but more coherent. - Alcoholic American couple Nora (Alison Eliot) and Jeff (Jared Harris) take young son and visit wife's family mansion in Ireland. - Huge brooding mansion beside the ocean. Nora's grandmother is near 90 and senile. Her uncle is nearly blind, but he continues his experimentation with a 2000-year-old petrified body found in the bogs and now in the basement. - Nora and Jeff are trying to give up alcohol, or so they tell themselves. Very flip as if always drunk. - Irish accent is hard to understand at times. - Harris's acting style is very much like Christopher Walken's. - Myth of Earth and Sky: At the beginning of the world there was just Earth and Sky and they greatly loved each other. Then they were separated. When it rains the Sky is trying to touch the Earth.
Mark R. Leeper<EMAIL_ADDRESS>Copyright 1998 Mark R. Leeper
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innovaphone.ui1.lib
Includes
The following files have to be included in the html file.
UI nodes
innovaphone.ui1.nodePrototype
This prototype is used as a base for all UI nodes in the library. It defines useful functions for creating and manipulating DOM nodes.
- addText(text)
- Sets the innerText property of the node.
- addHTML(text)
- Sets the innerHTML property of the node.
- setStyle(style, value)
- Sets a single attribute of the style of the node.
- Example:
div.setStyle("color", "red");
- setAttribute(attribute, value)
- Sets a single attribute of a node.
-
Example:
a.setAttribute("href", "https://www.innovaphone.com").setAttribute("target", "_blank");
- add(node, before)
- Adds a child node.
-
- node
- The child node to be added
- before (optional)
- The new child node is added before this element. If no element is given, the new child node is added at the end.
- rem(node)
- Removes a child node.
- clear()
- Removes all child nodes.
- addTranslation(languages, id, property, args)
- Adds a dynamic translation from innovaphone.lib1.Languages to the node. Text is updated automatically when the language is changed. Returns the node itself.
- Note: If the node is discarded it should also be detached from the Languages object using Languages.clear.
-
- languages
- An object of type innovaphone.lib1.Languages.
- id
- The id of the text.
- property (optional)
- The property of the DOM node where the translation should appear (e.g. "innerText", "placeholder", "title"). Defaults to "innerText".
- args (optional)
- An array with the values for the placeholder substitution.
-
Example:
var texts = {
en: {
conn: "Connected as $0",
hello: "Hello!"
},
de: {
conn: "Verbunden als $0",
hello: "Hallo!"
}
};
var langs = innovaphone.lib1.Languages(texts, "en");
var div1 = new innovaphone.ui1.Node("div").addTranslation(langs, "hello");
var div2 = new innovaphone.ui1.Node("div").addTranslation(langs, "conn", "innerText", ["John Doe"]);
// detach node that is not in use anymore
langs.clear(div1);
- createTranslation(languages, id, property, args)
- Works the same way as addTranslation but returns an innovaphone.lib1.TranslatedNode object that can be used for further manipulation.
innovaphone.ui1.Node
Represents a generic DOM node. Supports all methods defined in innovaphone.ui1.nodePrototype.
- innovaphone.ui1.Node(type, style, content, cl)
- Constructor
-
- type
- The HTML dom node type (e.g. "div", "input", "hr", ...).
- style (optional)
- The style attribute of the node (e.g. "color: blue; font-size: 14px").
- content (optional)
- The innerText of the node.
- cl (optional)
- The CSS class of the node.
innovaphone.ui1.Div
Represents a DIV node. Supports all methods defined in innovaphone.ui1.nodePrototype.
- innovaphone.ui1.Div(style, content, cl)
- Constructor
-
- style (optional)
- The style attribute of the node (e.g. "color: blue; font-size: 14px").
- content (optional)
- The innerText of the node.
- cl (optional)
- The CSS class of the node.
innovaphone.ui1.Input
Represents an input field. Supports all methods defined in innovaphone.ui1.nodePrototype.
- innovaphone.ui1.Input(style, value, placeHolder, maxLength, type, cl)
- Constructor
-
- style (optional)
- The style attribute of the node (e.g. "color: blue; font-size: 14px").
- content (optional)
- The text content of the input field.
- placeHolder (optional)
- The placeholder text.
- maxLength (optional)
- Maximum number of characters.
- type (optional)
- The type of data (e.g. "text", "number", "password")
- cl (optional)
- The CSS class of the node.
innovaphone.ui1.Password
Represents an input password field. Supports all methods defined in innovaphone.ui1.nodePrototype and offered by innovaphone.ui1.Input.
The benefit of using innovaphone.ui1.Password is, that you'll have a show password button inside the input field.
- innovaphone.ui1.Password(style, value, placeHolder, maxLength, cl, styleInput, clInput)
- Constructor
-
- style (optional)
- The style attribute of the node (e.g. "color: blue; font-size: 14px").
- content (optional)
- The text content of the input field.
- placeHolder (optional)
- The placeholder text.
- maxLength (optional)
- Maximum number of characters.
- cl (optional)
- The CSS class of the node.
- styleInput (optional)
- The style attribute for the embedded input field (e.g. "color: blue; font-size: 14px").
- clInput (optional)
- The class for the embedded input field.
innovaphone.ui1.Checkbox
Represents an checkbox control. Supports all methods defined in innovaphone.ui1.nodePrototype.
- innovaphone.ui1.Checkbox(style, value, cl, background, foreground, backgroundOff)
- Constructor
-
- style (optional)
- The style attribute of the node (e.g. "width: 20px; height: 20px; background-color: blue").
- value (true or false)
- Initial state of the checkbox control.
- cl (optional)
- The CSS class of the node.
- background (optional)
- The background node color when this is checked (gray as default).
- foreground (optional)
- The checkmark color (white as default).
- backgroundOff (optional)
- The background node color when this is unchecked (if not set, background is set as default).
- getValue()
- Get the 'checked' state of the checkbox control (true or false).
- setValue(value)
- Set the 'checked' state of the checkbox control (true or false).
- setDisabled(value)
- Set the 'disabled' state of the checkbox control (true or false).
- setTooltip(text)
- Text to be displayed on mouseover.
Switching CSS variables
innovaphone.ui1.CssVariables is a library that can be used to switch between different sets of CSS variables.
For example this can be used to switch between different color schemes.
- innovaphone.ui1.CssVariables(sets, current, element)
- Constructor
-
- sets
- An object containing all sets and the individual CSS variables with their name and value.
- current
- The id of the current set.
- element (optional)
- The DOM node on which the variables should be set. Defaults to document.body.
-
Example:
var schemeDefinitions = {
dark: {
"--background": "black",
"--foreground": "white"
},
light: {
"--background": "white",
"--foreground": "black"
}
};
var schemes = new innovaphone.ui1.CssVariables(schemeDefinitions, "dark");
- current
- Property containing the id of the current set.
- activate(id)
- Switches the CSS variables to the values defined in the given set.
-
- id
- The id of the set.
-
Example:
schemes.activate("light");
- toggle()
- Toggles the current set.


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HILARY AND JACKIE (director: Anand Tucker; cast: Emily Watson (Jacqueline du Pré), Rachel Griffiths (Hilary), David Morrissey (Kiffer Finzi), James Fraim (Daniel Barenboim), Charles Dance (father), Celia Imrie (mother), Keely Flanders and Auriol Evans (the du Pre sisters as youngsters), 1998)
This intelligent and emotionally moving film, is based on the true-life story, as recorded in the autobiography, "A Genius in the Family," written by one of the musical prodigy English sisters, Hilary (Rachel), the flautist in the Du Pre family. Jackie (Emily) is the younger sister, the one who reaches fame as a virtuoso cellist, especially known for her interpretations of Elgar's compositions. The crux of the film is about their sisterly relationship, their competition with each other and their need for each other, as they were growing up in the 1950s. The differences between them, that eventually has them living disparate lives, becomes the dramatic focal point of the film, with Jackie growing up to become the great musician who marries another celebrated musician, Daniel Barenboim (James), but who is very unhappy for reasons that are very complex and not easily answered but thoroughly explored in the film, leaving the audience to be the judge of what might have gone wrong, while Hilary finds bliss in domesticity, giving up music to live in the country and raise chickens and children with her vibrant husband, Kiffer (David).
The cast is superb. Emily Watson, in the very difficult and trying role of a petulant genius, searching for answers about herself, plagued by self-doubt that borders on madness and the need for close ties to home, is brilliantly portrayed, as she reveals Jackie's compelling character, showing her supple musical know-how and her erotic sexual liberation and her binding commitment to what she wants to pursue and, towards the end of her life, a spunky grit to deal with her debilitating illness of multiple sclerosis that will take her life in 1987 when she is just 42-years-old, in a most unmerciful way.
It is rare that a film has such a meaty part for one woman to play...this film has two such parts. The other female lead, is admirably played by Rachel, as she is solid in her role as the first prodigy child to shine brightly, and as the jealous one when she realizes her sister has caught up with her talent wise and will soon surpass her. We can read her mind as she grapples with her inability to grow as a musician, and when Kiffer aggressively pursues her and weds her, giving her the self-esteem she has always wanted, she will cease to be a professional musician.
The girls never seemed taken with a genuine love of music except as it suited their talents. Their strivings for success was at first a reason to be coddled by their ambitious stage mother (Celia), then it became a chance for the sisters to remain close, each sharing the spotlight, and then something mysterious happened, perhaps a twist of fate, that allowed Hilary to fall off the pedestal, while the once weaker performer, Jackie, took her practice to heart just to keep up with her older sister, who now becomes recognized by the world for her musical talent. The stage father (Dance) has a rather interesting role, as the moralist in the family, who is a bit of a stodgy kind of anti-semite (mom,too), whose bemused character might be summed up as he is reflecting on his daughter's marriage to Barenboim and conversion to the Jewish religion, "She can't be Jewish, she is blond."
The film begins innocently on a deserted English beach, where the sisters played by Keely Flanders and Auriol Evans, happily frolic on the sand, meeting a strange ghost-like woman, who tells Jackie in a whisper, "everything will be all right." This ominous tone, sets a haunting mood for the film, that will quickly move away from these seemingly happy days of their youth and take them to their adulthood, where distance will separate them, in a way that they could never have believed possible from their early upbringing.
The well-crafted screenplay by Frank Cottrell Boyce, is ably directed by Tucker, who is directing his first feature film. The only fault I found with his direction, is that I thought it was unnecessary to have duplicate scenes of what Hilary and Jackie experienced, that is, we didn't have to see it from each one's point of view. I thought the film would have been better served if the action was continuous, the going back over the same scenes from a different point of view really killed the pace of the film, slowing it down too much. The sisterly relationship was so powerful and subtle, that when Jackie runs away from Barenboim for no apparent reason and winds up at Hilary's remote country house and suggests to Hilary that she allow her devoted husband to service her, we are caught up in the intrigues of a very trying sibling rivalry, that questions sensibility and one's mores, all the while testing the sister's very genuine affection for each other.
This is a film that glows with confidence, sparked by a maturity of material, that tries to unravel some of the mysteries in life that make one wonder about certain decisions made that can impact one's entire life. The film worked so well because of the contrasts between the two female stars, they prevented the film from burying itself in a pit of sadness and, also, it was deftly handled by the director's ability to keep the movie light, not to make Jackie's situation into a downer... And the music helped, it was simply marvelous.
REVIEWED ON 2/10/99 GRADE: B
http:www.sover.net/~ozus
Dennis Schwartz: "Movie Reviews"<EMAIL_ADDRESS>© ALL RIGHTS RESERVED DENNIS SCHWARTZ
The review above was posted to the
rec.arts.movies.reviews newsgroup (de.rec.film.kritiken for German reviews).
The Internet Movie Database accepts no responsibility for the contents of the
review and has no editorial control. Unless stated otherwise, the copyright
belongs to the author.
Please direct comments/criticisms of the review to relevant newsgroups.
Broken URLs inthe reviews are the responsibility of the author.
The formatting of the review is likely to differ from the original due
to ASCII to HTML conversion.
Related links: index of all rec.arts.movies.reviews reviews


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