JavaFX is an open source, next generation client application platform for desktop, mobile and embedded systems built with Java. It is offered as a cross-platform Java library and it delivers ...
JavaFx提供了 AnimationTimer ，它的 handle 方法每帧调用一次，我可以在目标出现的那一帧打一个标记，在点击事件处理时读取当前帧号，两者相减就是相对帧数。
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