Contact:getPositions
Returns the contact points of the two colliding fixtures. There can be one or two points.
x1, y1, x2, y2 = Contact:getPositions()
x1 number The x coordinate of the first contact point.
y1 number The y coordinate of the first contact point.
x2 number The x coordinate of the second contact point.
y2 number The y coordinate of the second contact point.