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@欧拉欧拉 那建议把这个教程往前面拉一下，不然我做到这里还不知道右键的功能是拖拽。
刚才走新手教程，界面直接卡到左上角位置去，没办法拖拽回到中心。建议增加一个拖拽的功能吧，这样放大了也能自由拖拽画板位置了。。。
