易语言PNG分层窗口源码,PNG分层窗口,SetAlpha,GetGraphics,GetBitmap,GetMDC,Init,Update,destroy,Paint,PtInRcf,WndProc,MouseMove,MouseUp,MouseDown,图形_九宫绘图,GetWindowRect,GetDC,CreateCompatibleDC,CreateDIBSection,SelectObject,UpdateLayeredWi