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疑惑

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#1 Created at ... [Delete] [Delete and Lock User] 
ny = y - step * math.sin(angle)

#这里应该是ny=y+step*math.sin(angle)吧，这么明显的错误为什么没人发现

对吗？

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#2 Created at ... [Delete] [Delete and Lock User]

如果向后走怎么办改变step吗？

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