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这样SetPos的时候控件才知道画到哪里，好比画到10，如果range是0~100,那就画十分之一 如果range是0~1000,那就画百分之一-When such controls SetPos know where that painting is like drawing to 10, if the range is 0 to 100, it would draw one-tenth of 1000 if the range is 0, then draw one per cent