AnimationState(final State startState, final long milliseconds, boolean isForwardAndReverse) {
assert startState != null && milliseconds > 0;
assert SwingUtilities.isEventDispatchThread();
this.startState = startState;
this.duration = milliseconds * 1000000;
this.startTime = System.nanoTime();
this.isForwardAndReverse = isForwardAndReverse;
progress = 0f;
}
private void updateProgress() {
assert SwingUtilities.isEventDispatchThread();
if (isDone()) {
return;
}
long currentTime = System.nanoTime();
progress = ((float) (currentTime - startTime)) / duration;
progress = Math.max(progress, 0); // in case time was reset
if (progress >= 1) {
progress = 1;
if (isForwardAndReverse) {
startTime = currentTime;
progress = 0;
isForward = !isForward;
}
}
}
void paintSkin(Skin skin, Graphics _g, int dx, int dy, int dw, int dh, State state) {
assert SwingUtilities.isEventDispatchThread();
updateProgress();
if (!isDone()) {
Graphics2D g = (Graphics2D) _g.create();
skin.paintSkinRaw(g, dx, dy, dw, dh, startState);
float alpha;
if (isForward) {
alpha = progress;
} else {
alpha = 1 - progress;
}
g.setComposite(AlphaComposite.SrcOver.derive(alpha));
skin.paintSkinRaw(g, dx, dy, dw, dh, state);
g.dispose();
} else {
skin.paintSkinRaw(_g, dx, dy, dw, dh, state);
}
}
boolean isDone() {
assert SwingUtilities.isEventDispatchThread();
return progress >= 1;
}