/** Trims all steps after endFrame. */
protected void trimSteps() {
// return if trimming not needed
VideoClip clip = trackerPanel.getPlayer().getVideoClip();
int n = clip.getFrameCount() - 1;
int end = getEndFrame() == Integer.MAX_VALUE ? n : getEndFrame();
while (end > getStartFrame() && !clip.includesFrame(end)) {
end--;
}
if (end >= lastValidFrame) return;
int trimCount = (tracePtsPerStep * (lastValidFrame - end)) / clip.getStepSize();
ParticleModel[] models = getModels();
for (ParticleModel next : models) {
// create smaller trace arrays and copy existing points into them
next.locked = false;
int traceLength = next.traceX.length - trimCount;
if (traceLength < 0) return; // trap for error during closing
next.prevX = next.traceX;
next.prevY = next.traceY;
next.traceX = new double[traceLength];
next.traceY = new double[traceLength];
System.arraycopy(next.prevX, 0, next.traceX, 0, traceLength);
System.arraycopy(next.prevY, 0, next.traceY, 0, traceLength);
// reduce number of steps
next.steps.setLength(end + 1);
// refresh derivatives
next.updateDerivatives(end - 2, lastValidFrame - end + 2);
// restore state
restoreState(end);
next.support.firePropertyChange("steps", null, null); // $NON-NLS-1$
next.locked = true;
}
lastValidFrame = end;
repaint();
// trackerPanel.repaint();
}
