com.sun.j3d.loaders.lw3d

Class FloatValueInterpolator

java.lang.Object

javax.media.j3d.SceneGraphObject

javax.media.j3d.Node

javax.media.j3d.Leaf

javax.media.j3d.Behavior

javax.media.j3d.Interpolator

com.sun.j3d.loaders.lw3d.FloatValueInterpolator

Direct Known Subclasses:

LightIntensityPathInterpolator, SwitchPathInterpolator

abstract class FloatValueInterpolator
extends Interpolator

This class acts as an interpolator between values specified in a floating point array, based on knot values (keyframes) specified in a knots array.

Field Summary

Fields

Modifier and Type	Field and Description
protected float	currentInterpolationRatio
protected int	currentKnotIndex
protected float	currentValue
private float[]	knots
private int	knotsLength
protected float[]	values

Fields inherited from class javax.media.j3d.Interpolator

defaultWakeupCriterion

Fields inherited from class javax.media.j3d.Node

ALLOW_AUTO_COMPUTE_BOUNDS_READ, ALLOW_AUTO_COMPUTE_BOUNDS_WRITE, ALLOW_BOUNDS_READ, ALLOW_BOUNDS_WRITE, ALLOW_COLLIDABLE_READ, ALLOW_COLLIDABLE_WRITE, ALLOW_LOCAL_TO_VWORLD_READ, ALLOW_LOCALE_READ, ALLOW_PARENT_READ, ALLOW_PICKABLE_READ, ALLOW_PICKABLE_WRITE, ENABLE_COLLISION_REPORTING, ENABLE_PICK_REPORTING

Constructor Summary

Constructors

Constructor and Description
FloatValueInterpolator(Alpha alpha, float[] k, float[] v) Constructs a new FloatValueInterpolator object.

Method Summary

Methods

Modifier and Type	Method and Description
protected void	computePathInterpolation() This method computes the bounding knot indices and interpolation value "currentValue" given the current value of alpha, the knots[] array and the array of values.
(package private) float	getValue(int index) This method retrieves the value at the specified index.
(package private) void	setValue(int index, float value) This method sets the value at the specified index for this interpolator.

Methods inherited from class javax.media.j3d.Interpolator

getAlpha, initialize, setAlpha

Methods inherited from class javax.media.j3d.Behavior

getEnable, getNumSchedulingIntervals, getSchedulingBoundingLeaf, getSchedulingBounds, getSchedulingInterval, getView, getWakeupCondition, postId, processStimulus, setEnable, setSchedulingBoundingLeaf, setSchedulingBounds, setSchedulingInterval, updateNodeReferences, wakeupOn

Methods inherited from class javax.media.j3d.Node

cloneNode, cloneTree, cloneTree, cloneTree, cloneTree, cloneTree, cloneTree, duplicateNode, getBounds, getBoundsAutoCompute, getCollidable, getLocale, getLocalToVworld, getLocalToVworld, getParent, getPickable, setBounds, setBoundsAutoCompute, setCollidable, setPickable

Methods inherited from class javax.media.j3d.SceneGraphObject

clearCapability, clearCapabilityIsFrequent, duplicateSceneGraphObject, getCapability, getCapabilityIsFrequent, getName, getUserData, isCompiled, isLive, setCapability, setCapabilityIsFrequent, setName, setUserData, toString

Methods inherited from class java.lang.Object

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

Field Detail

knots

private float[] knots

knotsLength

private int knotsLength

currentKnotIndex

protected int currentKnotIndex

currentInterpolationRatio

protected float currentInterpolationRatio

values

protected float[] values

currentValue

protected float currentValue

Constructor Detail

FloatValueInterpolator

FloatValueInterpolator(Alpha alpha,
                      float[] k,
                      float[] v)

Constructs a new FloatValueInterpolator object.

Parameters:

alpha - the alpha object for this interpolator

knots - an array of knot values that specify a spline

Method Detail

setValue

void setValue(int index,
            float value)

This method sets the value at the specified index for this interpolator.

Parameters:

index - the index to be changed

position - the new value at index

getValue

float getValue(int index)

This method retrieves the value at the specified index.

Parameters:

index - the index of the value requested

Returns:

the interpolator's value at the index

computePathInterpolation

protected void computePathInterpolation()

This method computes the bounding knot indices and interpolation value "currentValue" given the current value of alpha, the knots[] array and the array of values. If the index is 0 and there will be no interpolation, both the index variable and the interpolation variable are set to 0. Otherwise, currentKnotIndex is set to the lower index of the two bounding knot points and the currentInterpolationRatio variable is set to the ratio of the alpha value between these two bounding knot points.