/**
* Uses {@link #getTrackTime()} to compute the <code>animationTime</code>, which is between
* {@link #getAnimationStart()} and {@link #getAnimationEnd()}. When the <code>trackTime</code>
* is 0, the <code>animationTime</code> is equal to the <code>animationStart</code> time.
*/
public float getAnimationTime() {
if (loop) {
float duration = animationEnd - animationStart;
if (duration == 0) return animationStart;
return (trackTime % duration) + animationStart;
}
return Math.min(trackTime + animationStart, animationEnd);
}
private void setCurrent(int index, TrackEntry current, boolean interrupt) {
TrackEntry from = expandToIndex(index);
tracks.set(index, current);
if (from != null) {
if (interrupt) queue.interrupt(from);
current.mixingFrom = from;
current.mixTime = 0;
from.timelinesRotation.clear(); // Reset rotation for mixing out, in case entry was mixed in.
// If not completely mixed in, set mixAlpha so mixing out happens from current mix to zero.
if (from.mixingFrom != null && from.mixDuration > 0)
current.mixAlpha *= Math.min(from.mixTime / from.mixDuration, 1);
}
queue.start(current);
}
private void applyRotateTimeline(
Timeline timeline,
Skeleton skeleton,
float time,
float alpha,
boolean setupPose,
float[] timelinesRotation,
int i,
boolean firstFrame) {
if (firstFrame) timelinesRotation[i] = 0;
if (alpha == 1) {
timeline.apply(skeleton, 0, time, null, 1, setupPose, false);
return;
}
RotateTimeline rotateTimeline = (RotateTimeline) timeline;
Bone bone = skeleton.bones.get(rotateTimeline.boneIndex);
float[] frames = rotateTimeline.frames;
if (time < frames[0]) { // Time is before first frame.
if (setupPose) bone.rotation = bone.data.rotation;
return;
}
float r2;
if (time >= frames[frames.length - ENTRIES]) // Time is after last frame.
r2 = bone.data.rotation + frames[frames.length + PREV_ROTATION];
else {
// Interpolate between the previous frame and the current frame.
int frame = Animation.binarySearch(frames, time, ENTRIES);
float prevRotation = frames[frame + PREV_ROTATION];
float frameTime = frames[frame];
float percent =
rotateTimeline.getCurvePercent(
(frame >> 1) - 1, 1 - (time - frameTime) / (frames[frame + PREV_TIME] - frameTime));
r2 = frames[frame + ROTATION] - prevRotation;
r2 -= (16384 - (int) (16384.499999999996 - r2 / 360)) * 360;
r2 = prevRotation + r2 * percent + bone.data.rotation;
r2 -= (16384 - (int) (16384.499999999996 - r2 / 360)) * 360;
}
// Mix between rotations using the direction of the shortest route on the first frame while
// detecting crosses.
float r1 = setupPose ? bone.data.rotation : bone.rotation;
float total, diff = r2 - r1;
if (diff == 0) total = timelinesRotation[i];
else {
diff -= (16384 - (int) (16384.499999999996 - diff / 360)) * 360;
float lastTotal, lastDiff;
if (firstFrame) {
lastTotal = 0;
lastDiff = diff;
} else {
lastTotal = timelinesRotation[i]; // Angle and direction of mix, including loops.
lastDiff = timelinesRotation[i + 1]; // Difference between bones.
}
boolean current = diff > 0, dir = lastTotal >= 0;
// Detect cross at 0 (not 180).
if (Math.signum(lastDiff) != Math.signum(diff) && Math.abs(lastDiff) <= 90) {
// A cross after a 360 rotation is a loop.
if (Math.abs(lastTotal) > 180) lastTotal += 360 * Math.signum(lastTotal);
dir = current;
}
total = diff + lastTotal - lastTotal % 360; // Store loops as part of lastTotal.
if (dir != current) total += 360 * Math.signum(lastTotal);
timelinesRotation[i] = total;
}
timelinesRotation[i + 1] = diff;
r1 += total * alpha;
bone.rotation = r1 - (16384 - (int) (16384.499999999996 - r1 / 360)) * 360;
}