BOOL StretchBlt (
int x,//The x-coordinate of the upper-left corner of the specified destination rectangle area
int y,//y-coordinate of the upper-left corner of the specified destination rectangle area
int nwidth,//width of the specified destination rectangle area
int nheight,//height of the specified destination rectangle area
cdc* PSRCDC,
int XSRC,//Specifies the x-coordinate of the upper-left corner of the source rectangular area
int YSRC,//Specifies the y-coordinate of the upper-left corner of the source rectangular area
int Nsrcwidth,//Specifies the width of the source rectangle area
int Nsrcheight,//Specifies the height of the source rectangle area
DWORD Dwrop//This parameter reference msdn,srccopy type is direct copy
); This function copies a bitmap resource from one rectangular region to another, that is, a scaled bitmap BOOL TransparentBlt (
int Xdest,
int Ydest,
int Ndestwidth,
int Ndestheight,
cdc* PSRCDC,
int XSRC,
int YSRC,
int Nsrcwidth,
int Nsrcheight,
UINT clrtransparent
); This function also has a zoom function, but the last parameter of this function is used to specify RGB as a transparent color;
BOOL BitBlt (
int x,
int y,
int nwidth,
int nheight,
cdc* PSRCDC,
int XSRC,
int YSRC,
DWORD Dwrop
); This function is also used to copy bitmap resources, but does not have the zoom function.
Examples of usage:
CPAINTDC DC (this); CBitmap backbmp;
BACKBMP.LOADBITMAPW (IDB_BITMAP1);
BITMAP BM; Backbmp.getbitmap (&BM);
CDC Imagedc;
Imagedc.createcompatibledc (&DC);
cbitmap* poldimagebmp = Imagedc.selectobject (&backbmp);
dc. StretchBlt (0, 0, bm.bmwidth+15, bm.bmheight+15, &imagedc, 0, 0, bm.bmwidth, Bm.bmheight, srccopy); Imagedc.selectobject (poldimagebmp);
CBitmap forebmp;
FOREBMP.LOADBITMAPW (IDB_BITMAP2);
Forebmp.getbitmap (&BM);
Poldimagebmp = Imagedc.selectobject (&forebmp);
dc. TransparentBlt (0, 0, bm.bmwidth+15, bm.bmheight+15, &imagedc, 0, 0, bm.bmwidth, bm.bmheight, RGB (255, 255, 255));
Imagedc.selectobject (poldimagebmp); (Weiqubo) |
