org.jdesktop.animation.timing.interpolation
Class Evaluator<T>

java.lang.Object
  org.jdesktop.animation.timing.interpolation.Evaluator<T>

public abstract class Evaluator<T>
extends java.lang.Object

This class is used by KeyValues to calculate intermediate values for specific types. This class has built-in support for the following data types:

• java.lang.Byte
• java.lang.Short
• java.lang.Integer
• java.lang.Long
• java.lang.Float
• java.lang.Double
• java.awt.Color
• java.awt.geom.Point2D
• java.awt.geom.Line2D
• java.awt.geom.Dimension2D
• java.awt.geom.Rectangle2D
• java.awt.geom.RoundRectangle2D
• java.awt.geom.Ellipse2D
• java.awt.geom.Arc2D
• java.awt.geom.QuadCurve2D
• java.awt.geom.CubicCurve2D

Constructor Summary

Evaluator()

Method Summary

abstract T

evaluate(T v0, T v1, float fraction) Abstract method to evaluate between two boundary values.

Methods inherited from class java.lang.Object

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

Constructor Detail

Evaluator

public Evaluator()

Method Detail

evaluate

public abstract T evaluate(T v0,
                           T v1,
                           float fraction)

Abstract method to evaluate between two boundary values. Built-in implementations all use linear parametric evaluation:

      v = v0 + (v1 - v0) * fraction
 

Extenders of Evaluator will need to override this method and do something similar for their own types. Note that this mechanism may be used to create non-linear interpolators for specific value types, although it may besimpler to just use the linear/parametric interpolation technique here and perform non-linear interpolation through custom Interpolators rather than perform custom calculations in this method; the point of this class is to allow calculations with new/unknown types, not to provide another mechanism for non-linear interpolation.