随后，主循环在每次循环时都检查事件、重置绘图状态、绘出圆形的“门户”窗口，然后以动画形式将其失真返回当前时帧。

Then, each pass of the main loop checks for events, resets the draw state, draws the circular "portal" windows, then animates their distortion back to the current time frame.

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拖到绘图页后，可以指定行为图表中的状态。

Drag onto the page to specify a state in your behavior diagram.

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拖到绘图页后，可以添加其子状态存储在单独状态图中的复合状态。

Drag onto the page to add a composite state whose sub-states are stored on a separate Statechart diagram.

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