protected void updateSplineCache() {
Vec deltaP =
Vec.subtract(
keyFrameList.get(currentFrame2.nextIndex()).position(),
keyFrameList.get(currentFrame1.nextIndex()).position());
pv1 =
Vec.add(
Vec.multiply(deltaP, 3.0f),
Vec.multiply(keyFrameList.get(currentFrame1.nextIndex()).tgP(), (-2.0f)));
pv1 = Vec.subtract(pv1, keyFrameList.get(currentFrame2.nextIndex()).tgP());
pv2 = Vec.add(Vec.multiply(deltaP, (-2.0f)), keyFrameList.get(currentFrame1.nextIndex()).tgP());
pv2 = Vec.add(pv2, keyFrameList.get(currentFrame2.nextIndex()).tgP());
splineCacheIsValid = true;
}
protected void updateCurrentKeyFrameForTime(float time) {
// Assertion: times are sorted in monotone order.
// Assertion: keyFrame_ is not empty
// TODO: Special case for loops when closed path is implemented !!
if (!currentFrmValid)
// Recompute everything from scratch
currentFrame1 = keyFrameList.listIterator();
// currentFrame_[1]->peekNext() <---> keyFr.get(currentFrame1.nextIndex());
while (keyFrameList.get(currentFrame1.nextIndex()).time() > time) {
currentFrmValid = false;
if (!currentFrame1.hasPrevious()) break;
currentFrame1.previous();
}
if (!currentFrmValid) currentFrame2 = keyFrameList.listIterator(currentFrame1.nextIndex());
while (keyFrameList.get(currentFrame2.nextIndex()).time() < time) {
currentFrmValid = false;
if (!currentFrame2.hasNext()) break;
currentFrame2.next();
}
if (!currentFrmValid) {
currentFrame1 = keyFrameList.listIterator(currentFrame2.nextIndex());
if ((currentFrame1.hasPrevious())
&& (time < keyFrameList.get(currentFrame2.nextIndex()).time())) currentFrame1.previous();
currentFrame0 = keyFrameList.listIterator(currentFrame1.nextIndex());
if (currentFrame0.hasPrevious()) currentFrame0.previous();
currentFrame3 = keyFrameList.listIterator(currentFrame2.nextIndex());
if (currentFrame3.hasNext()) currentFrame3.next();
currentFrmValid = true;
splineCacheIsValid = false;
}
}
/**
* Interpolate {@link #frame()} at time {@code time} (expressed in seconds). {@link
* #interpolationTime()} is set to {@code time} and {@link #frame()} is set accordingly.
*
* <p>If you simply want to change {@link #interpolationTime()} but not the {@link #frame()}
* state, use {@link #setInterpolationTime(float)} instead.
*/
public void interpolateAtTime(float time) {
this.checkValidity();
setInterpolationTime(time);
if ((keyFrameList.isEmpty()) || (frame() == null)) return;
if (!valuesAreValid) updateModifiedFrameValues();
updateCurrentKeyFrameForTime(time);
if (!splineCacheIsValid) updateSplineCache();
float alpha;
float dt =
keyFrameList.get(currentFrame2.nextIndex()).time()
- keyFrameList.get(currentFrame1.nextIndex()).time();
if (Util.zero(dt)) alpha = 0.0f;
else alpha = (time - keyFrameList.get(currentFrame1.nextIndex()).time()) / dt;
Vec pos =
Vec.add(
keyFrameList.get(currentFrame1.nextIndex()).position(),
Vec.multiply(
Vec.add(
keyFrameList.get(currentFrame1.nextIndex()).tgP(),
Vec.multiply(Vec.add(pv1, Vec.multiply(pv2, alpha)), alpha)),
alpha));
float mag =
Util.lerp(
keyFrameList.get(currentFrame1.nextIndex()).magnitude(),
keyFrameList.get(currentFrame2.nextIndex()).magnitude(),
alpha);
Rotation q;
if (gScene.is3D()) {
q =
Quat.squad(
(Quat) keyFrameList.get(currentFrame1.nextIndex()).orientation(),
((KeyFrame3D) keyFrameList.get(currentFrame1.nextIndex())).tgQ(),
((KeyFrame3D) keyFrameList.get(currentFrame2.nextIndex())).tgQ(),
(Quat) keyFrameList.get(currentFrame2.nextIndex()).orientation(),
alpha);
} else {
q =
new Rot(
Util.lerp(
keyFrameList.get(currentFrame1.nextIndex()).orientation().angle(),
keyFrameList.get(currentFrame2.nextIndex()).orientation().angle(),
(alpha)));
}
frame().setPositionWithConstraint(pos);
frame().setRotationWithConstraint(q);
frame().setMagnitude(mag);
}