org.monte.media
Class BezierInterpolator

java.lang.Object
  org.monte.media.Interpolator
      org.monte.media.AbstractSplineInterpolator
          org.monte.media.BezierInterpolator

public class BezierInterpolator
extends AbstractSplineInterpolator

A bezier interpolator for use in conjunction with an Animator object.

This class interpolates fractional values using a Bezier spline. The anchor points for the spline are assumed to be (0, 0) and (1, 1). Control points should all be in the range [0, 1].

FIXME - This interpolator does not work!

Version:

$Id: BezierInterpolator.java 156 2012-01-28 16:08:21Z werner $

Author:

Werner Randelshofer

Constructor Summary

BezierInterpolator(double[][] controlPoints)
Interpolates between the specified control points.

BezierInterpolator(double[][] controlPoints, boolean reverse, long timespan)
Interpolates between the specified control points.

BezierInterpolator(float x1, float y1, float x2, float y2)
Creates a new instance of SplineInterpolator with the control points defined by (x1, y1) and (x2, y2).

BezierInterpolator(float x1, float y1, float x2, float y2, boolean reverse, long timespan)
Creates a new instance of SplineInterpolator with the control points defined by (x1, y1) and (x2, y2).

BezierInterpolator(float x1, float y1, float x2, float y2, long timespan)
Creates a new instance of SplineInterpolator with the control points defined by (x1, y1) and (x2, y2).

Method Summary

java.awt.geom.Point2D.Float	getXY(float t, java.awt.geom.Point2D.Float xy) Evaluates the bezier function and returns a 2D point.
float	getY(float t) Evaluates the bezier function and returns a 2D point.

Methods inherited from class org.monte.media.AbstractSplineInterpolator

getFraction, update, updateFractions

Methods inherited from class org.monte.media.Interpolator

finish, initialize, interpolate, isElapsed, isFinished, isSequential, replaces, setTimespan

Methods inherited from class java.lang.Object

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

Constructor Detail

BezierInterpolator

public BezierInterpolator(float x1,
                          float y1,
                          float x2,
                          float y2)

Creates a new instance of SplineInterpolator with the control points defined by (x1, y1) and (x2, y2). The anchor points are implicitly defined as (0, 0) and (1, 1).

The interpolator runs for one second.

Parameters:

x1 - The x coordinate for the first bezier control point.

y1 - The y coordinate for the first bezier control point.

x2 - The x coordinate for the second bezier control point.

y2 - The x coordinate for the second bezier control point.

Throws:

java.lang.IllegalArgumentException - This exception is thrown when values beyond the allowed [0,1] range are passed in

BezierInterpolator

public BezierInterpolator(float x1,
                          float y1,
                          float x2,
                          float y2,
                          long timespan)

Creates a new instance of SplineInterpolator with the control points defined by (x1, y1) and (x2, y2). The anchor points are implicitly defined as (0, 0) and (1, 1).

The interpolator runs for the specified time span.

Parameters:

x1 - The x coordinate for the first bezier control point.

y1 - The y coordinate for the first bezier control point.

x2 - The x coordinate for the second bezier control point.

y2 - The x coordinate for the second bezier control point.

timespan - The time span in milliseconds.

Throws:

java.lang.IllegalArgumentException - This exception is thrown when values beyond the allowed [0,1] range are passed in

BezierInterpolator

public BezierInterpolator(float x1,
                          float y1,
                          float x2,
                          float y2,
                          boolean reverse,
                          long timespan)

Creates a new instance of SplineInterpolator with the control points defined by (x1, y1) and (x2, y2). The anchor points are implicitly defined as (0, 0) and (1, 1).

The interpolator runs for the specified time span.

Parameters:

x1 - The x coordinate for the first bezier control point.

y1 - The y coordinate for the first bezier control point.

x2 - The x coordinate for the second bezier control point.

y2 - The x coordinate for the second bezier control point.

reverse - Run interpolator in the reverse direction.

timespan - The time span in milliseconds.

Throws:

java.lang.IllegalArgumentException - This exception is thrown when values beyond the allowed [0,1] range are passed in

BezierInterpolator

public BezierInterpolator(double[][] controlPoints)

Interpolates between the specified control points.

Parameters:

controlPoints - The control points of the bezier path. Must include the first and the last control point. The curve must be in the range [0,1].

BezierInterpolator

public BezierInterpolator(double[][] controlPoints,
                          boolean reverse,
                          long timespan)

Interpolates between the specified control points.

Parameters:

controlPoints - The control points of the bezier path. Must include the first and the last control point. The curve must be in the range [0,1].

Method Detail

getXY

public java.awt.geom.Point2D.Float getXY(float t,
                                         java.awt.geom.Point2D.Float xy)

Evaluates the bezier function and returns a 2D point.

Specified by:

getXY in class AbstractSplineInterpolator

Returns:

A point, with x- and y-coordinates for time t.

getY

public float getY(float t)

Evaluates the bezier function and returns a 2D point.

Specified by:

getY in class AbstractSplineInterpolator

Returns:

A point, with x- and y-coordinates for time t.