public final class TextLayout extends Object implements Cloneable
TextLayout
is an immutable graphical representation of styled
character data.
It provides the following capabilities:
A TextLayout
object can be rendered using
its draw
method.
TextLayout
can be constructed either directly or through
the use of a LineBreakMeasurer
. When constructed directly, the
source text represents a single paragraph. LineBreakMeasurer
allows styled text to be broken into lines that fit within a particular
width. See the LineBreakMeasurer
documentation for more
information.
TextLayout
construction logically proceeds as follows:
TextAttribute.FONT
is present, otherwise by computing
a default font using the attributes that have been defined
All graphical information returned from a TextLayout
object's methods is relative to the origin of the
TextLayout
, which is the intersection of the
TextLayout
object's baseline with its left edge. Also,
coordinates passed into a TextLayout
object's methods
are assumed to be relative to the TextLayout
object's
origin. Clients usually need to translate between a
TextLayout
object's coordinate system and the coordinate
system in another object (such as a
Graphics
object).
TextLayout
objects are constructed from styled text,
but they do not retain a reference to their source text. Thus,
changes in the text previously used to generate a TextLayout
do not affect the TextLayout
.
Three methods on a TextLayout
object
(getNextRightHit
, getNextLeftHit
, and
hitTestChar
) return instances of TextHitInfo
.
The offsets contained in these TextHitInfo
objects
are relative to the start of the TextLayout
, not
to the text used to create the TextLayout
. Similarly,
TextLayout
methods that accept TextHitInfo
instances as parameters expect the TextHitInfo
object's
offsets to be relative to the TextLayout
, not to any
underlying text storage model.
Examples:
Constructing and drawing a TextLayout
and its bounding
rectangle:
Graphics2D g = ...; Point2D loc = ...; Font font = Font.getFont("Helvetica-bold-italic"); FontRenderContext frc = g.getFontRenderContext(); TextLayout layout = new TextLayout("This is a string", font, frc); layout.draw(g, (float)loc.getX(), (float)loc.getY()); Rectangle2D bounds = layout.getBounds(); bounds.setRect(bounds.getX()+loc.getX(), bounds.getY()+loc.getY(), bounds.getWidth(), bounds.getHeight()); g.draw(bounds);
Hit-testing a TextLayout
(determining which character is at
a particular graphical location):
Point2D click = ...; TextHitInfo hit = layout.hitTestChar( (float) (click.getX() - loc.getX()), (float) (click.getY() - loc.getY()));
Responding to a right-arrow key press:
int insertionIndex = ...; TextHitInfo next = layout.getNextRightHit(insertionIndex); if (next != null) { // translate graphics to origin of layout on screen g.translate(loc.getX(), loc.getY()); Shape[] carets = layout.getCaretShapes(next.getInsertionIndex()); g.draw(carets[0]); if (carets[1] != null) { g.draw(carets[1]); } }
Drawing a selection range corresponding to a substring in the source text. The selected area may not be visually contiguous:
// selStart, selLimit should be relative to the layout, // not to the source text int selStart = ..., selLimit = ...; Color selectionColor = ...; Shape selection = layout.getLogicalHighlightShape(selStart, selLimit); // selection may consist of disjoint areas // graphics is assumed to be tranlated to origin of layout g.setColor(selectionColor); g.fill(selection);
Drawing a visually contiguous selection range. The selection range may
correspond to more than one substring in the source text. The ranges of
the corresponding source text substrings can be obtained with
getLogicalRangesForVisualSelection()
:
TextHitInfo selStart = ..., selLimit = ...; Shape selection = layout.getVisualHighlightShape(selStart, selLimit); g.setColor(selectionColor); g.fill(selection); int[] ranges = getLogicalRangesForVisualSelection(selStart, selLimit); // ranges[0], ranges[1] is the first selection range, // ranges[2], ranges[3] is the second selection range, etc.
Note: Font rotations can cause text baselines to be rotated, and multiple runs with different rotations can cause the baseline to bend or zig-zag. In order to account for this (rare) possibility, some APIs are specified to return metrics and take parameters 'in baseline-relative coordinates' (e.g. ascent, advance), and others are in 'in standard coordinates' (e.g. getBounds). Values in baseline-relative coordinates map the 'x' coordinate to the distance along the baseline, (positive x is forward along the baseline), and the 'y' coordinate to a distance along the perpendicular to the baseline at 'x' (positive y is 90 degrees clockwise from the baseline vector). Values in standard coordinates are measured along the x and y axes, with 0,0 at the origin of the TextLayout. Documentation for each relevant API indicates what values are in what coordinate system. In general, measurement-related APIs are in baseline-relative coordinates, while display-related APIs are in standard coordinates.
LineBreakMeasurer
,
TextAttribute
,
TextHitInfo
,
LayoutPath
| Modifier and Type | Class and Description |
|---|---|
static class |
TextLayout.CaretPolicy
Defines a policy for determining the strong caret location.
|
| Modifier and Type | Field and Description |
|---|---|
static TextLayout.CaretPolicy |
DEFAULT_CARET_POLICY
This
CaretPolicy is used when a policy is not specified
by the client. |
| Constructor and Description |
|---|
TextLayout(AttributedCharacterIterator text,
FontRenderContext frc)
Constructs a
TextLayout from an iterator over styled text. |
TextLayout(String string,
Font font,
FontRenderContext frc)
|
TextLayout(String string,
Map<? extends AttributedCharacterIterator.Attribute,?> attributes,
FontRenderContext frc)
Constructs a
TextLayout from a String
and an attribute set. |
| Modifier and Type | Method and Description |
|---|---|
protected Object |
clone()
Creates a copy of this
TextLayout . |
void |
draw(Graphics2D g2,
float x,
float y)
Renders this
TextLayout at the specified location in
the specified Graphics2D context. |
boolean |
equals(Object obj)
Returns
true if the specified Object is a
TextLayout object and if the specified Object
equals this TextLayout . |
boolean |
equals(TextLayout rhs)
Returns
true if the two layouts are equal. |
float |
getAdvance()
Returns the advance of this
TextLayout . |
float |
getAscent()
Returns the ascent of this
TextLayout . |
byte |
getBaseline()
Returns the baseline for this
TextLayout . |
float[] |
getBaselineOffsets()
Returns the offsets array for the baselines used for this
TextLayout . |
Shape |
getBlackBoxBounds(int firstEndpoint,
int secondEndpoint)
Returns the black box bounds of the characters in the specified range.
|
Rectangle2D |
getBounds()
Returns the bounds of this
TextLayout . |
float[] |
getCaretInfo(TextHitInfo hit)
Returns information about the caret corresponding to
hit . |
float[] |
getCaretInfo(TextHitInfo hit,
Rectangle2D bounds)
Returns information about the caret corresponding to
hit . |
Shape |
getCaretShape(TextHitInfo hit)
Returns a
Shape representing the caret at the specified
hit inside the natural bounds of this TextLayout . |
Shape |
getCaretShape(TextHitInfo hit,
Rectangle2D bounds)
Returns a
Shape representing the caret at the specified
hit inside the specified bounds. |
Shape[] |
getCaretShapes(int offset)
Returns two paths corresponding to the strong and weak caret.
|
Shape[] |
getCaretShapes(int offset,
Rectangle2D bounds)
Returns two paths corresponding to the strong and weak caret.
|
Shape[] |
getCaretShapes(int offset,
Rectangle2D bounds,
TextLayout.CaretPolicy policy)
Returns two paths corresponding to the strong and weak caret.
|
int |
getCharacterCount()
Returns the number of characters represented by this
TextLayout . |
byte |
getCharacterLevel(int index)
Returns the level of the character at
index . |
float |
getDescent()
Returns the descent of this
TextLayout . |
TextLayout |
getJustifiedLayout(float justificationWidth)
Creates a copy of this
TextLayout justified to the
specified width. |
LayoutPath |
getLayoutPath()
Return the LayoutPath, or null if the layout path is the
default path (x maps to advance, y maps to offset).
|
float |
getLeading()
Returns the leading of the
TextLayout . |
Shape |
getLogicalHighlightShape(int firstEndpoint,
int secondEndpoint)
Returns a
Shape enclosing the logical selection in the
specified range, extended to the natural bounds of this
TextLayout . |
Shape |
getLogicalHighlightShape(int firstEndpoint,
int secondEndpoint,
Rectangle2D bounds)
Returns a
Shape enclosing the logical selection in the
specified range, extended to the specified bounds . |
int[] |
getLogicalRangesForVisualSelection(TextHitInfo firstEndpoint,
TextHitInfo secondEndpoint)
Returns the logical ranges of text corresponding to a visual selection.
|
TextHitInfo |
getNextLeftHit(int offset)
Returns the hit for the next caret to the left (top); if no
such hit, returns
null . |
TextHitInfo |
getNextLeftHit(int offset,
TextLayout.CaretPolicy policy)
Returns the hit for the next caret to the left (top); if no
such hit, returns
null . |
TextHitInfo |
getNextLeftHit(TextHitInfo hit)
Returns the hit for the next caret to the left (top); if no such
hit, returns
null . |
TextHitInfo |
getNextRightHit(int offset)
Returns the hit for the next caret to the right (bottom); if no
such hit, returns
null . |
TextHitInfo |
getNextRightHit(int offset,
TextLayout.CaretPolicy policy)
Returns the hit for the next caret to the right (bottom); if no
such hit, returns
null . |
TextHitInfo |
getNextRightHit(TextHitInfo hit)
Returns the hit for the next caret to the right (bottom); if there
is no such hit, returns
null . |
Shape |
getOutline(AffineTransform tx)
Returns a
Shape representing the outline of this
TextLayout . |
Rectangle |
getPixelBounds(FontRenderContext frc,
float x,
float y)
Returns the pixel bounds of this
TextLayout when
rendered in a graphics with the given
FontRenderContext at the given location. |
float |
getVisibleAdvance()
Returns the advance of this
TextLayout , minus trailing
whitespace. |
Shape |
getVisualHighlightShape(TextHitInfo firstEndpoint,
TextHitInfo secondEndpoint)
Returns a
Shape enclosing the visual selection in the
specified range, extended to the bounds. |
Shape |
getVisualHighlightShape(TextHitInfo firstEndpoint,
TextHitInfo secondEndpoint,
Rectangle2D bounds)
Returns a path enclosing the visual selection in the specified range,
extended to
bounds . |
TextHitInfo |
getVisualOtherHit(TextHitInfo hit)
Returns the hit on the opposite side of the specified hit's caret.
|
protected void |
handleJustify(float justificationWidth)
Justify this layout.
|
int |
hashCode()
Returns the hash code of this
TextLayout . |
TextHitInfo |
hitTestChar(float x,
float y)
Returns a
TextHitInfo corresponding to the
specified point. |
TextHitInfo |
hitTestChar(float x,
float y,
Rectangle2D bounds)
Returns a
TextHitInfo corresponding to the
specified point. |
void |
hitToPoint(TextHitInfo hit,
Point2D point)
Convert a hit to a point in standard coordinates.
|
boolean |
isLeftToRight()
Returns
true if this TextLayout has
a left-to-right base direction or false if it has
a right-to-left base direction. |
boolean |
isVertical()
Returns
true if this TextLayout is vertical. |
String |
toString()
Returns debugging information for this
TextLayout . |
public static final TextLayout.CaretPolicy DEFAULT_CARET_POLICY
CaretPolicy
is used when a policy is not specified
by the client. With this policy, a hit on a character whose direction
is the same as the line direction is stronger than a hit on a
counterdirectional character. If the characters' directions are
the same, a hit on the leading edge of a character is stronger
than a hit on the trailing edge of a character.public TextLayout(String string, Font font, FontRenderContext frc)
TextLayout
from a String
and a Font
. All the text is styled using the specified
Font
.
The String
must specify a single paragraph of text,
because an entire paragraph is required for the bidirectional
algorithm.
string
- the text to displayfont
- a Font
used to style the textfrc
- contains information about a graphics device which is needed
to measure the text correctly.
Text measurements can vary slightly depending on the
device resolution, and attributes such as antialiasing. This
parameter does not specify a translation between the
TextLayout
and user space.public TextLayout(String string, Map<? extends AttributedCharacterIterator.Attribute,?> attributes, FontRenderContext frc)
TextLayout
from a String
and an attribute set.
All the text is styled using the provided attributes.
string
must specify a single paragraph of text because an
entire paragraph is required for the bidirectional algorithm.
string
- the text to displayattributes
- the attributes used to style the textfrc
- contains information about a graphics device which is needed
to measure the text correctly.
Text measurements can vary slightly depending on the
device resolution, and attributes such as antialiasing. This
parameter does not specify a translation between the
TextLayout
and user space.public TextLayout(AttributedCharacterIterator text, FontRenderContext frc)
TextLayout
from an iterator over styled text.
The iterator must specify a single paragraph of text because an entire paragraph is required for the bidirectional algorithm.
text
- the styled text to displayfrc
- contains information about a graphics device which is needed
to measure the text correctly.
Text measurements can vary slightly depending on the
device resolution, and attributes such as antialiasing. This
parameter does not specify a translation between the
TextLayout
and user space.protected Object clone()
TextLayout
.public TextLayout getJustifiedLayout(float justificationWidth)
TextLayout
justified to the
specified width.
If this TextLayout
has already been justified, an
exception is thrown. If this TextLayout
object's
justification ratio is zero, a TextLayout
identical
to this TextLayout
is returned.
justificationWidth
- the width to use when justifying the line.
For best results, it should not be too different from the current
advance of the line.TextLayout
justified to the specified width.Error
- if this layout has already been justified, an Error is
thrown.protected void handleJustify(float justificationWidth)
Some code may rely on immutablity of layouts. Subclassers should not call this directly, but instead should call getJustifiedLayout, which will call this method on a clone of this layout, preserving the original.
justificationWidth
- the width to use when justifying the line.
For best results, it should not be too different from the current
advance of the line.getJustifiedLayout(float)
public byte getBaseline()
TextLayout
.
The baseline is one of the values defined in Font
,
which are roman, centered and hanging. Ascent and descent are
relative to this baseline. The baselineOffsets
are also relative to this baseline.TextLayout
.getBaselineOffsets()
,
Font
public float[] getBaselineOffsets()
TextLayout
.
The array is indexed by one of the values defined in
Font
, which are roman, centered and hanging. The
values are relative to this TextLayout
object's
baseline, so that getBaselineOffsets[getBaseline()] == 0
.
Offsets are added to the position of the TextLayout
object's baseline to get the position for the new baseline.
TextLayout
.getBaseline()
,
Font
public float getAdvance()
TextLayout
.
The advance is the distance from the origin to the advance of the
rightmost (bottommost) character. This is in baseline-relative
coordinates.TextLayout
.public float getVisibleAdvance()
TextLayout
, minus trailing
whitespace. This is in baseline-relative coordinates.TextLayout
without the
trailing whitespace.getAdvance()
public float getAscent()
TextLayout
.
The ascent is the distance from the top (right) of the
TextLayout
to the baseline. It is always either
positive or zero. The ascent is sufficient to
accommodate superscripted text and is the maximum of the sum of the
ascent, offset, and baseline of each glyph. The ascent is
the maximum ascent from the baseline of all the text in the
TextLayout. It is in baseline-relative coordinates.TextLayout
.public float getDescent()
TextLayout
.
The descent is the distance from the baseline to the bottom (left) of
the TextLayout
. It is always either positive or zero.
The descent is sufficient to accommodate subscripted text and is the
maximum of the sum of the descent, offset, and baseline of each glyph.
This is the maximum descent from the baseline of all the text in
the TextLayout. It is in baseline-relative coordinates.TextLayout
.public float getLeading()
TextLayout
.
The leading is the suggested interline spacing for this
TextLayout
. This is in baseline-relative
coordinates.
The leading is computed from the leading, descent, and baseline
of all glyphvectors in the TextLayout
. The algorithm
is roughly as follows:
maxD = 0; maxDL = 0; for (GlyphVector g in all glyphvectors) { maxD = max(maxD, g.getDescent() + offsets[g.getBaseline()]); maxDL = max(maxDL, g.getDescent() + g.getLeading() + offsets[g.getBaseline()]); } return maxDL - maxD;
TextLayout
.public Rectangle2D getBounds()
TextLayout
.
The bounds are in standard coordinates.
Due to rasterization effects, this bounds might not enclose all of the pixels rendered by the TextLayout.
It might not coincide exactly with the ascent, descent, origin or advance of theTextLayout
.Rectangle2D
that is the bounds of this
TextLayout
.public Rectangle getPixelBounds(FontRenderContext frc, float x, float y)
TextLayout
when
rendered in a graphics with the given
FontRenderContext
at the given location. The
graphics render context need not be the same as the
FontRenderContext
used to create this
TextLayout
, and can be null. If it is null, the
FontRenderContext
of this TextLayout
is used.frc
- the FontRenderContext
of the Graphics
.x
- the x-coordinate at which to render this TextLayout
.y
- the y-coordinate at which to render this TextLayout
.Rectangle
bounding the pixels that would be affected.GlyphVector.getPixelBounds(java.awt.font.FontRenderContext, float, float)
public boolean isLeftToRight()
true
if this TextLayout
has
a left-to-right base direction or false
if it has
a right-to-left base direction. The TextLayout
has a base direction of either left-to-right (LTR) or
right-to-left (RTL). The base direction is independent of the
actual direction of text on the line, which may be either LTR,
RTL, or mixed. Left-to-right layouts by default should position
flush left. If the layout is on a tabbed line, the
tabs run left to right, so that logically successive layouts position
left to right. The opposite is true for RTL layouts. By default they
should position flush left, and tabs run right-to-left.true
if the base direction of this
TextLayout
is left-to-right; false
otherwise.public boolean isVertical()
true
if this TextLayout
is vertical.true
if this TextLayout
is vertical;
false
otherwise.public int getCharacterCount()
TextLayout
.TextLayout
.public float[] getCaretInfo(TextHitInfo hit, Rectangle2D bounds)
hit
.
The first element of the array is the intersection of the caret with
the baseline, as a distance along the baseline. The second element
of the array is the inverse slope (run/rise) of the caret, measured
with respect to the baseline at that point.
This method is meant for informational use. To display carets, it
is better to use getCaretShapes
.
hit
- a hit on a character in this TextLayout
bounds
- the bounds to which the caret info is constructed.
The bounds is in baseline-relative coordinates.getCaretShapes(int, Rectangle2D, TextLayout.CaretPolicy)
,
Font.getItalicAngle()
public float[] getCaretInfo(TextHitInfo hit)
hit
.
This method is a convenience overload of getCaretInfo
and
uses the natural bounds of this TextLayout
.hit
- a hit on a character in this TextLayout
public TextHitInfo getNextRightHit(TextHitInfo hit)
null
.
If the hit character index is out of bounds, an
IllegalArgumentException
is thrown.hit
- a hit on a character in this layoutnull
.public TextHitInfo getNextRightHit(int offset, TextLayout.CaretPolicy policy)
null
. The hit is to the right of
the strong caret at the specified offset, as determined by the
specified policy.
The returned hit is the stronger of the two possible
hits, as determined by the specified policy.offset
- an insertion offset in this TextLayout
.
Cannot be less than 0 or greater than this TextLayout
object's character count.policy
- the policy used to select the strong caretnull
.public TextHitInfo getNextRightHit(int offset)
null
. The hit is to the right of
the strong caret at the specified offset, as determined by the
default policy.
The returned hit is the stronger of the two possible
hits, as determined by the default policy.offset
- an insertion offset in this TextLayout
.
Cannot be less than 0 or greater than the TextLayout
object's character count.null
.public TextHitInfo getNextLeftHit(TextHitInfo hit)
null
.
If the hit character index is out of bounds, an
IllegalArgumentException
is thrown.hit
- a hit on a character in this TextLayout
.null
.public TextHitInfo getNextLeftHit(int offset, TextLayout.CaretPolicy policy)
null
. The hit is to the left of
the strong caret at the specified offset, as determined by the
specified policy.
The returned hit is the stronger of the two possible
hits, as determined by the specified policy.offset
- an insertion offset in this TextLayout
.
Cannot be less than 0 or greater than this TextLayout
object's character count.policy
- the policy used to select the strong caretnull
.public TextHitInfo getNextLeftHit(int offset)
null
. The hit is to the left of
the strong caret at the specified offset, as determined by the
default policy.
The returned hit is the stronger of the two possible
hits, as determined by the default policy.offset
- an insertion offset in this TextLayout
.
Cannot be less than 0 or greater than this TextLayout
object's character count.null
.public TextHitInfo getVisualOtherHit(TextHitInfo hit)
hit
- the specified hitpublic Shape getCaretShape(TextHitInfo hit, Rectangle2D bounds)
Shape
representing the caret at the specified
hit inside the specified bounds.hit
- the hit at which to generate the caretbounds
- the bounds of the TextLayout
to use
in generating the caret. The bounds is in baseline-relative
coordinates.Shape
representing the caret. The returned
shape is in standard coordinates.public Shape getCaretShape(TextHitInfo hit)
Shape
representing the caret at the specified
hit inside the natural bounds of this TextLayout
.hit
- the hit at which to generate the caretShape
representing the caret. The returned
shape is in standard coordinates.public byte getCharacterLevel(int index)
index
.
Indices -1 and characterCount
are assigned the base
level of this TextLayout
.index
- the index of the character from which to get the levelpublic Shape[] getCaretShapes(int offset, Rectangle2D bounds, TextLayout.CaretPolicy policy)
offset
- an offset in this TextLayout
bounds
- the bounds to which to extend the carets. The
bounds is in baseline-relative coordinates.policy
- the specified CaretPolicy
null
. The returned shapes
are in standard coordinates.public Shape[] getCaretShapes(int offset, Rectangle2D bounds)
getCaretShapes
that uses the default caret policy.offset
- an offset in this TextLayout
bounds
- the bounds to which to extend the carets. This is
in baseline-relative coordinates.DEFAULT_CARET_POLICY
. These are
in standard coordinates.public Shape[] getCaretShapes(int offset)
getCaretShapes
that uses the default caret policy and this TextLayout
object's natural bounds.offset
- an offset in this TextLayout
DEFAULT_CARET_POLICY
. These are
in standard coordinates.public int[] getLogicalRangesForVisualSelection(TextHitInfo firstEndpoint, TextHitInfo secondEndpoint)
firstEndpoint
- an endpoint of the visual rangesecondEndpoint
- the other endpoint of the visual range.
This endpoint can be less than firstEndpoint
.getVisualHighlightShape(TextHitInfo, TextHitInfo, Rectangle2D)
public Shape getVisualHighlightShape(TextHitInfo firstEndpoint, TextHitInfo secondEndpoint, Rectangle2D bounds)
bounds
.
If the selection includes the leftmost (topmost) position, the selection
is extended to the left (top) of bounds
. If the
selection includes the rightmost (bottommost) position, the selection
is extended to the right (bottom) of the bounds. The height
(width on vertical lines) of the selection is always extended to
bounds
.
Although the selection is always contiguous, the logically selected
text can be discontiguous on lines with mixed-direction text. The
logical ranges of text selected can be retrieved using
getLogicalRangesForVisualSelection
. For example,
consider the text 'ABCdef' where capital letters indicate
right-to-left text, rendered on a right-to-left line, with a visual
selection from 0L (the leading edge of 'A') to 3T (the trailing edge
of 'd'). The text appears as follows, with bold underlined areas
representing the selection:
defCBAThe logical selection ranges are 0-3, 4-6 (ABC, ef) because the visually contiguous text is logically discontiguous. Also note that since the rightmost position on the layout (to the right of 'A') is selected, the selection is extended to the right of the bounds.
firstEndpoint
- one end of the visual selectionsecondEndpoint
- the other end of the visual selectionbounds
- the bounding rectangle to which to extend the selection.
This is in baseline-relative coordinates.Shape
enclosing the selection. This is in
standard coordinates.getLogicalRangesForVisualSelection(TextHitInfo, TextHitInfo)
,
getLogicalHighlightShape(int, int, Rectangle2D)
public Shape getVisualHighlightShape(TextHitInfo firstEndpoint, TextHitInfo secondEndpoint)
Shape
enclosing the visual selection in the
specified range, extended to the bounds. This method is a
convenience overload of getVisualHighlightShape
that
uses the natural bounds of this TextLayout
.firstEndpoint
- one end of the visual selectionsecondEndpoint
- the other end of the visual selectionShape
enclosing the selection. This is
in standard coordinates.public Shape getLogicalHighlightShape(int firstEndpoint, int secondEndpoint, Rectangle2D bounds)
Shape
enclosing the logical selection in the
specified range, extended to the specified bounds
.
If the selection range includes the first logical character, the
selection is extended to the portion of bounds
before
the start of this TextLayout
. If the range includes
the last logical character, the selection is extended to the portion
of bounds
after the end of this TextLayout
.
The height (width on vertical lines) of the selection is always
extended to bounds
.
The selection can be discontiguous on lines with mixed-direction text.
Only those characters in the logical range between start and limit
appear selected. For example, consider the text 'ABCdef' where capital
letters indicate right-to-left text, rendered on a right-to-left line,
with a logical selection from 0 to 4 ('ABCd'). The text appears as
follows, with bold standing in for the selection, and underlining for
the extension:
defCBAThe selection is discontiguous because the selected characters are visually discontiguous. Also note that since the range includes the first logical character (A), the selection is extended to the portion of the
bounds
before the start of the layout, which in
this case (a right-to-left line) is the right portion of the
bounds
.firstEndpoint
- an endpoint in the range of characters to selectsecondEndpoint
- the other endpoint of the range of characters
to select. Can be less than firstEndpoint
. The range
includes the character at min(firstEndpoint, secondEndpoint), but
excludes max(firstEndpoint, secondEndpoint).bounds
- the bounding rectangle to which to extend the selection.
This is in baseline-relative coordinates.getVisualHighlightShape(TextHitInfo, TextHitInfo, Rectangle2D)
public Shape getLogicalHighlightShape(int firstEndpoint, int secondEndpoint)
Shape
enclosing the logical selection in the
specified range, extended to the natural bounds of this
TextLayout
. This method is a convenience overload of
getLogicalHighlightShape
that uses the natural bounds of
this TextLayout
.firstEndpoint
- an endpoint in the range of characters to selectsecondEndpoint
- the other endpoint of the range of characters
to select. Can be less than firstEndpoint
. The range
includes the character at min(firstEndpoint, secondEndpoint), but
excludes max(firstEndpoint, secondEndpoint).Shape
enclosing the selection. This is in
standard coordinates.public Shape getBlackBoxBounds(int firstEndpoint, int secondEndpoint)
firstEndpoint
- one end of the character rangesecondEndpoint
- the other end of the character range. Can be
less than firstEndpoint
.Shape
enclosing the black box bounds. This is
in standard coordinates.public TextHitInfo hitTestChar(float x, float y, Rectangle2D bounds)
TextHitInfo
corresponding to the
specified point.
Coordinates outside the bounds of the TextLayout
map to hits on the leading edge of the first logical character,
or the trailing edge of the last logical character, as appropriate,
regardless of the position of that character in the line. Only the
direction along the baseline is used to make this evaluation.x
- the x offset from the origin of this
TextLayout
. This is in standard coordinates.y
- the y offset from the origin of this
TextLayout
. This is in standard coordinates.bounds
- the bounds of the TextLayout
. This
is in baseline-relative coordinates.public TextHitInfo hitTestChar(float x, float y)
TextHitInfo
corresponding to the
specified point. This method is a convenience overload of
hitTestChar
that uses the natural bounds of this
TextLayout
.x
- the x offset from the origin of this
TextLayout
. This is in standard coordinates.y
- the y offset from the origin of this
TextLayout
. This is in standard coordinates.public int hashCode()
TextLayout
.hashCode
in class Object
TextLayout
.Object.equals(java.lang.Object)
,
System.identityHashCode(java.lang.Object)
public boolean equals(Object obj)
true
if the specified Object
is a
TextLayout
object and if the specified Object
equals this TextLayout
.equals
in class Object
obj
- an Object
to test for equalitytrue
if the specified Object
equals this TextLayout
; false
otherwise.Object.hashCode()
,
HashMap
public boolean equals(TextLayout rhs)
true
if the two layouts are equal.
Two layouts are equal if they contain equal glyphvectors in the same order.rhs
- the TextLayout
to compare to this
TextLayout
true
if the specified TextLayout
equals this TextLayout
.public String toString()
TextLayout
.public void draw(Graphics2D g2, float x, float y)
TextLayout
at the specified location in
the specified Graphics2D
context.
The origin of the layout is placed at x, y. Rendering may touch
any point within getBounds()
of this position. This
leaves the g2
unchanged. Text is rendered along the
baseline path.g2
- the Graphics2D
context into which to render
the layoutx
- the X coordinate of the origin of this TextLayout
y
- the Y coordinate of the origin of this TextLayout
getBounds()
public Shape getOutline(AffineTransform tx)
Shape
representing the outline of this
TextLayout
.tx
- an optional AffineTransform
to apply to the
outline of this TextLayout
.Shape
that is the outline of this
TextLayout
. This is in standard coordinates.public LayoutPath getLayoutPath()
public void hitToPoint(TextHitInfo hit, Point2D point)
hit
- the hit to check. This must be a valid hit on
the TextLayout.point
- the returned point. The point is in standard
coordinates.IllegalArgumentException
- if the hit is not valid for the
TextLayout.NullPointerException
- if hit or point is null.Dracula Javadoc Sample, Made with Allan Im.


2 Anonymity, Privacy, and Ethical Frameworks
Week 5
Lecture: Part 1: Data profiling II; Part 2: Anonymity and privacy I
Topics: Discovering uniques, frequent itemset and association rule mining; Overview of responsible data sharing. Anonymization techniques; the limits of anonymization. Harms beyond re-identification
Reading:
- “The Belmont Report” (1979) [pdf]
- “Critical questions for Big Data”, danah boyd and Kate Crawford (2012) [pdf]
Lab: Data profiling and data cleaning
Week 6
Lecture: Anonymity and privacy II
Topics: Differential privacy; privacy-preserving synthetic data generation; exploring the privacy / utility trade-off.
Reading:
- “A firm foundation for private data analysis”, C. Dwork (2011) [ACM DL]
- “Can a set of equations keep U.S. census data private?”, J. Mervis (2019) [Science]
Lab: Data Synthesizer


Exciting! You’ve taken the first step and decided that you want to start a business.
Consider some of the unique qualities of Long Beach and what type of businesses do well here.
Next you’ll conduct market research to see if other businesses are pursuing a similar idea. This will help you find your competitive advantage and help you turn your idea into a profitable business.
{{ cms:partial:shared/link_box:"https://www.sba.gov/starting-business/how-start-business/understand-your-market":"READ":"Understand your market" }}