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並前往https://www.reddit.com/r/learnjavascript/comments/kn7te2/canvas_save_and_restore_for_undo_function/

Canvas save() and restore() for undo function? - Reddit

From what I understand I can do this by saving the canvas state at the beginning of a drawing action using ctx.save() , and then I should be ...

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查詢 「Ctx restore」的人也找了：

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