/**
* Finds the cursor under the given point.
*
* @param aPoint the coordinate of the potential cursor, cannot be <code>null</code>.
* @return the cursor index, or -1 if not found.
*/
protected final Cursor findCursor(final Point aPoint) {
final SignalDiagramModel model = getModel();
final long refIdx = model.locationToTimestamp(aPoint);
final double snapArea = CURSOR_SENSITIVITY_AREA / model.getZoomFactor();
for (Cursor cursor : model.getDefinedCursors()) {
if (cursor.inArea(refIdx, snapArea)) {
return cursor;
}
}
return null;
}
