@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (currentAction == null) {
return;
}
if (oldAction == null) {
updatePath(currentAction);
} else {
final float inverseProgress = 1f - animationProgress;
final float[] current = currentAction.getLineData();
final float[] old = oldAction.getLineData();
final float[] animated = animatedAction.getLineData();
for (int i = 0; i < animated.length; i++) {
animated[i] = current[i] * animationProgress + old[i] * inverseProgress;
}
updatePath(animatedAction);
}
canvas.rotate(
(rotation == ROTATE_CLOCKWISE ? 180f : -180f) * animationProgress, centerX, centerY);
canvas.drawPath(path, paint);
}
private void updatePath(Action action) {
path.reset();
final float[] data = action.getLineData();
// Once we're near the end of the animation we use the action segments to draw linked lines
if (animationProgress > 0.95f && !action.getLineSegments().isEmpty()) {
for (LineSegment s : action.getLineSegments()) {
path.moveTo(data[s.getStartIdx() + 0], data[s.getStartIdx() + 1]);
path.lineTo(data[s.getStartIdx() + 2], data[s.getStartIdx() + 3]);
for (int i = 1; i < s.indexes.length; i++) {
path.lineTo(data[s.indexes[i] + 0], data[s.indexes[i] + 1]);
path.lineTo(data[s.indexes[i] + 2], data[s.indexes[i] + 3]);
}
}
} else {
for (int i = 0; i < data.length; i += 4) {
path.moveTo(data[i + 0], data[i + 1]);
path.lineTo(data[i + 2], data[i + 3]);
}
}
}