#include <cxcore.h>
#include <cv.h>
#include <highgui.h>
#pragma comment(lib,"cv.lib")
#pragma comment(lib,"cxcore.lib")
#pragma comment(lib,"highgui.lib")

void rectangle(unsigned char *img, int height, int width, int channel, int xStart, int xEnd, int yStart, int yEnd, int large, int red, int blue, int green);

int main(){
   IplImage *img;
   img = cvLoadImage("./image.bmp", 1);

   rectangle((unsigned char*)img->imageData, img->height, img->width, img->nChannels, 5, 500, 100, 200, 5, 255, 0, 0);

   cvNamedWindow("img", 1);
   cvShowImage("img", img);
   cvWaitKey(-1);

   cvDestroyWindow("img");
   cvReleaseImage(&img);
   return 0;
}

/*
in : ‰¡‚Í4ƒoƒCƒg
*/
void rectangle(unsigned char *img, int height, int width, int channel, int xStart, int xEnd, int yStart, int yEnd, int large, int red, int blue, int green){
   int i, j;
   int widthStep;

   widthStep = width * channel;
   if( (widthStep % 4) != 0){
      widthStep = widthStep + 4 - widthStep%4;
   }

   for(i = yStart; i <= yEnd; ++i){
      for(j = 0; j < large; ++j){
         img[i * widthStep + (xStart + j) * 3] = blue;
         img[i * widthStep + (xStart + j) * 3 + 1] = green;
         img[i * widthStep + (xStart + j) * 3 + 2] = red;
         img[i * widthStep + (xEnd - j) * 3] = blue;
         img[i * widthStep + (xEnd - j) * 3 + 1] = green;
         img[i * widthStep + (xEnd - j) * 3 + 2] = red;
      }
   }
   for(j = xStart; j <= xEnd; ++j){
      for(i = 0; i < large; ++i){
         img[(yStart + i) * widthStep + j * 3] = blue;
         img[(yStart + i) * widthStep + j * 3 + 1] = green;
         img[(yStart + i) * widthStep + j * 3 + 2] = red;
         img[(yEnd - i) * widthStep + j * 3] = blue;
         img[(yEnd - i) * widthStep + j * 3 + 1] = green;
         img[(yEnd - i) * widthStep + j * 3 + 2] = red;
      }
   }

}