void OnTouchesEnded (List<CCTouch> touches, CCEvent touchEvent)
{
if (touches.Count > 0) {
var touch = touches [0];
if (easingLabel.BoundingBoxTransformedToWorld.ContainsPoint (touch.Location)) {
HandleEasingLabelTouched ();
} else if (inOutLabel.BoundingBoxTransformedToWorld.ContainsPoint (touch.Location)) {
HandleInOutLabelTouched ();
} else if (variableLabel.BoundingBoxTransformedToWorld.ContainsPoint (touch.Location)) {
HandleVariableLabelTouched ();
} else {
HandleMoveCircle (touch);
}
}
}