Private Declare Function StretchBlt Lib "gdi32" Alias "StretchBlt" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal nSrcWidth As Long, ByVal nSrcHeight As Long, ByVal dwRop As Long) As Long
'你去查询一下这个API的功能，它就能实现放大，缩小，翻转等功能，只要设置不同的宽、高就可以实现，主要是要设置dwRop的值，它能实现多种多样的绘图效果
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