y.view
Class BezierPathCalculator

java.lang.Object
  y.view.BezierPathCalculator

All Implemented Interfaces:

GenericEdgeRealizer.PathCalculator

public class BezierPathCalculator
extends java.lang.Object
implements GenericEdgeRealizer.PathCalculator

Calculates the visible path of an edge as a bezier curve. The behavior of this path calculator is similar to the path calculated for class BezierEdgeRealizer.

Constructor Summary

BezierPathCalculator()
Initializes a new BezierPathCalculator instance.

BezierPathCalculator(boolean interpolate)
Initializes a new BezierPathCalculator instance.

Method Summary

byte	calculatePath(EdgeRealizer context, BendList bends, java.awt.geom.GeneralPath path, java.awt.geom.Point2D sourceIntersectionPointOut, java.awt.geom.Point2D targetIntersectionPointOut) Calculates the visible path of an edge as a bezier curve.
boolean	isInterpolationEnabled() Determines whether or not additional control points are calculated from the coordinates of the edge's bends to ensure a smooth bezier path.
void	setInterpolationEnabled(boolean enabled) Specifies whether or not additional control points are calculated from the coordinates of the edge's bends that ensure a smooth bezier path.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BezierPathCalculator

public BezierPathCalculator()

Initializes a new BezierPathCalculator instance.

BezierPathCalculator

public BezierPathCalculator(boolean interpolate)

Initializes a new BezierPathCalculator instance.

Parameters:

interpolate - if true additional control points are calculated from the coordinates of the edge's bends to ensure a smooth bezier path; if false only the edge's bends are used as control points.

See Also:

setInterpolationEnabled(boolean)

Method Detail

isInterpolationEnabled

public boolean isInterpolationEnabled()

Determines whether or not additional control points are calculated from the coordinates of the edge's bends to ensure a smooth bezier path.

If interpolation is turned off, only the edge's bends are used as control points for the bezier path. I.e. the edge path is a piecewise composition of bezier curves such that bends 0,1,2,3 define the first bezier curve (with bend 0 being the start point, bend 3 being the end point, and bends 1 and 2 being parametric control points), bends 3,4,5,6 define the second bezier curve, etc. Consequently, the number of bends has to equal 3*n+1 for some n > -1 in this case.

Interpolation may only be turned off if the bends of the edge are specifically calculated as control points for bezier curves.

Default Value:

The default value is true.

Returns:

true if additional control points are calculated and false otherwise.

See Also:

setInterpolationEnabled(boolean)

setInterpolationEnabled

public void setInterpolationEnabled(boolean enabled)

Specifies whether or not additional control points are calculated from the coordinates of the edge's bends that ensure a smooth bezier path.

If interpolation is turned off, only the edge's bends are used as control points for the bezier path. I.e. the edge path is a piecewise composition of bezier curves such that bends 0,1,2,3 define the first bezier curve (with bend 0 being the start point, bend 3 being the end point, and bends 1 and 2 being parametric control points), bends 3,4,5,6 define the second bezier curve, etc. Consequently, the number of bends has to equal 3*n+1 for some n > -1 in this case.

Interpolation may only be turned off if the bends of the edge are specifically calculated as control points for bezier curves.

Default Value:

The default value is true.

Parameters:

enabled - if true additional control points are calculated; if false only the edge's bends are used as control points.

See Also:

isInterpolationEnabled()

calculatePath

public byte calculatePath(EdgeRealizer context,
                          BendList bends,
                          java.awt.geom.GeneralPath path,
                          java.awt.geom.Point2D sourceIntersectionPointOut,
                          java.awt.geom.Point2D targetIntersectionPointOut)

Calculates the visible path of an edge as a bezier curve. The given realizer's bends are the control points for the bezier curve.

Specified by:

calculatePath in interface GenericEdgeRealizer.PathCalculator

Parameters:

context - the context EdgeRealizer

bends - the current BendList

path - the current GeneralPath

sourceIntersectionPointOut - the point to place the source intersection point in

targetIntersectionPointOut - the point to place the target intersection point in

Returns:

one of EdgeRealizer.PATH_UNCLIPPED, EdgeRealizer.PATH_CLIPPED_AT_SOURCE, EdgeRealizer.PATH_CLIPPED_AT_TARGET, or EdgeRealizer.PATH_CLIPPED_AT_SOURCE_AND_TARGET.