com.hdcookbook.grin.features.parts
Class PointsEasingEquation

java.lang.Object
  com.hdcookbook.grin.features.parts.EasingEquation
      com.hdcookbook.grin.features.parts.PointsEasingEquation

public class PointsEasingEquation
extends EasingEquation

This class represents an degenerate case of an easing function that consists of just listing the in between points. It can be used by the GRIN compiler to generate a linear interpolation that approximates that list of points within a certain error.

Field Summary

Fields inherited from class com.hdcookbook.grin.features.parts.EasingEquation

framesAdded

Constructor Summary

PointsEasingEquation(int[][] points)

Method Summary

void	addKeyFrames(java.util.ArrayList<int[]> keyFrames, int[] end) Approximate this easing function with linear interpolation segments, making sure that the error doesn't exceed maxError units.
double	evaluate(double t, double b, double c, double d) Evaluate the eqsing equation.

Methods inherited from class com.hdcookbook.grin.features.parts.EasingEquation

setMaxError, trimUnneededKeyFrames

Methods inherited from class java.lang.Object

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

Constructor Detail

PointsEasingEquation

public PointsEasingEquation(int[][] points)

Method Detail

addKeyFrames

public void addKeyFrames(java.util.ArrayList<int[]> keyFrames,
                         int[] end)
                  throws java.io.IOException

Description copied from class: EasingEquation

Approximate this easing function with linear interpolation segments, making sure that the error doesn't exceed maxError units. We start the easing from keyFrames[size-1], and add to keyFrames.

Overrides:

addKeyFrames in class EasingEquation

Parameters:

keyFrames - a list of { frame#, value, ... } int arrays

end - Where to ease to, { frame#, value, ... }

Throws:

java.io.IOException

evaluate

public double evaluate(double t,
                       double b,
                       double c,
                       double d)

Description copied from class: EasingEquation

Evaluate the eqsing equation.

Specified by:

evaluate in class EasingEquation

Parameters:

t - current time in frames, seconds, or any other unit

b - beginning value

c - change in value

d - duration in frames, seconds, or any other unit