canvas - Use iplRotate the picture what I get is losing the part of left and right .why? -


the code create createimageheader 2 :imageso , imagede, value imagedata scanline , rotate judge angle, value scanline imagedata,

i show main code said behind,hope give me suggestion or thinking.

create: 

imageso = createimageheader(bmp->pixelformat, bmp->width,bmp->height);   imagede = createimageheader(bmp->pixelformat, bmp->width,bmp->height);

shift: 

bit1=(byte*) bmp->scanline[hsrc-1];   bit2=imageso->imagedata;   for(int i=0;i < hsrc;i++)     {       memcpy(bit2,bit1,cpy);       bit1+=wbmp;       bit2+=wipl;   }

rotate:

if(param.angle){    double xshift=0;    double yshift=0;    iiplgetrotateshift(bmp->width/2,bmp->height/2,bmpproperty.angle,&xshift,&yshift);      iiplrotate(imageso,imagede,bmpproperty.angle,xshift,yshift,ipl_inter_cubic|ipl_smooth_edge);   }

shift2: 

bit1=(byte*) bmp->scanline[hsrc-1];   bit2=imageso->imagedata;   for(int i=0;i < hsrc;i++)    {       memcpy(bit1,bit2,cpy);       bit1+=wbmp;       bit2+=wipl;   }

i know reason , because after rotated, canvas rotating,so set canvas square rectangle before.also understand picture in canvas's position help.

here website introduce details of canvas rotate. enter link description here


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