javax.media.j3d.ScaleInterpolator Maven / Gradle / Ivy
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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package javax.media.j3d;
/**
* Scale interpolation behavior. This class defines a behavior
* that modifies the uniform scale component of its target
* TransformGroup by linearly interpolating between a pair of
* specified scale values (using the value generated by the
* specified Alpha object). The interpolated scale value is
* used to generate a scale transform in the local coordinate
* system of this interpolator.
*/
public class ScaleInterpolator extends TransformInterpolator {
float minimumScale;
float maximumScale;
private Transform3D scale = new Transform3D();
// We can't use a boolean flag since it is possible
// that after alpha change, this procedure only run
// once at alpha.finish(). So the best way is to
// detect alpha value change.
private float prevAlphaValue = Float.NaN;
private WakeupCriterion passiveWakeupCriterion = new WakeupOnElapsedFrames(0, true);
// non-public, default constructor used by cloneNode
ScaleInterpolator() {
}
/**
* Constructs a trivial scale interpolator that varies its target
* TransformGroup node between the two specified alpha values
* using the specified alpha, an identity matrix,
* a minimum scale = 0.1f, and a maximum scale = 1.0f.
* @param alpha the alpha object for this interpolator
* @param target the TransformGroup node affected by this interpolator
*/
public ScaleInterpolator(Alpha alpha,
TransformGroup target) {
super(alpha, target);
this.minimumScale = 0.1f;
this.maximumScale = 1.0f;
}
/**
* Constructs a new scaleInterpolator object that varies its target
* TransformGroup node's scale component between two scale values
* (minimumScale and maximumScale).
* @param alpha the alpha object for this interpolator
* @param target the TransformGroup node affected by this interpolator
* @param axisOfTransform the transform that defines the local coordinate
* system in which this interpolator operates; the scale is done
* about the origin of this local coordinate system.
* @param minimumScale the starting scale
* @param maximumScale the ending scale
*/
public ScaleInterpolator(Alpha alpha,
TransformGroup target,
Transform3D axisOfTransform,
float minimumScale,
float maximumScale) {
super(alpha, target, axisOfTransform);
this.minimumScale = minimumScale;
this.maximumScale = maximumScale;
}
/**
* This method sets the minimumScale for this interpolator.
* @param scale The new minimal scale
*/
public void setMinimumScale(float scale) {
this.minimumScale = scale;
}
/**
* This method retrieves this interpolator's minimumScale.
* @return the interpolator's minimal scale value
*/
public float getMinimumScale() {
return this.minimumScale;
}
/**
* This method sets the maximumScale for this interpolator.
* @param scale the new maximum scale
*/
public void setMaximumScale(float scale) {
this.maximumScale = scale;
}
/**
* This method retrieves this interpolator's maximumScale.
* @return the interpolator's maximum scale vslue
*/
public float getMaximumScale() {
return this.maximumScale;
}
/**
* @deprecated As of Java 3D version 1.3, replaced by
* TransformInterpolator.setTransformAxis(Transform3D)
*/
public void setAxisOfScale(Transform3D axisOfScale) {
setTransformAxis(axisOfScale);
}
/**
* @deprecated As of Java 3D version 1.3, replaced by
* TransformInterpolator.getTransformAxis()
*/
public Transform3D getAxisOfScale() {
return getTransformAxis();
}
/**
* Computes the new transform for this interpolator for a given
* alpha value.
*
* @param alphaValue alpha value between 0.0 and 1.0
* @param transform object that receives the computed transform for
* the specified alpha value
*
* @since Java 3D 1.3
*/
@Override
public void computeTransform(float alphaValue, Transform3D transform) {
double val = (1.0-alphaValue)*minimumScale + alphaValue*maximumScale;
// construct a Transform3D from: axis * scale * axisInverse
scale.set(val);
transform.mul(axis, scale);
transform.mul(transform, axisInverse);
}
/**
* Used to create a new instance of the node. This routine is called
* by cloneTree
to duplicate the current node.
* @param forceDuplicate when set to true
, causes the
* duplicateOnCloneTree
flag to be ignored. When
* false
, the value of each node's
* duplicateOnCloneTree
variable determines whether
* NodeComponent data is duplicated or copied.
*
* @see Node#cloneTree
* @see Node#cloneNode
* @see Node#duplicateNode
* @see NodeComponent#setDuplicateOnCloneTree
*/
@Override
public Node cloneNode(boolean forceDuplicate) {
ScaleInterpolator si = new ScaleInterpolator();
si.duplicateNode(this, forceDuplicate);
return si;
}
/**
* Copies all ScaleInterpolator information from
* originalNode
into
* the current node. This method is called from the
* cloneNode
method which is, in turn, called by the
* cloneTree
method.
*
* @param originalNode the original node to duplicate.
* @param forceDuplicate when set to true
, causes the
* duplicateOnCloneTree
flag to be ignored. When
* false
, the value of each node's
* duplicateOnCloneTree
variable determines whether
* NodeComponent data is duplicated or copied.
*
* @exception RestrictedAccessException if this object is part of a live
* or compiled scenegraph.
*
* @see Node#duplicateNode
* @see Node#cloneTree
* @see NodeComponent#setDuplicateOnCloneTree
*/
@Override
void duplicateAttributes(Node originalNode, boolean forceDuplicate) {
super.duplicateAttributes(originalNode, forceDuplicate);
ScaleInterpolator si = (ScaleInterpolator) originalNode;
setMinimumScale(si.getMinimumScale());
setMaximumScale(si.getMaximumScale());
}
}