OpenCV学习笔记之课后习题练习3-5

 1 /*ch3_lx3_5.cpp
 2   添加功能：利用cvPtr2D函数画矩形
 3   本程序是learning opencv这本书的课后习题练习
 4   欢迎提出问题一起讨论*/
 5 #include "cv.h"
 6 #include "highgui.h"
 7 
 8 int main(int argc, char** argv)
 9 {
10     IplImage *img;
11     img = cvCreateImage(cvSize(210,210),IPL_DEPTH_8U,1);
12     cvZero(img);
13 
14     int interset_x = 0;
15     int interset_y = 0;
16     int offset_x = img->width;
17     int offset_y = img->height;
18     int add = 0;
19    // bool condition = true;
20 
21     while(add<200)
22     {
23         cvSetImageROI(img,cvRect(interset_x,interset_y,offset_x,offset_y));
24         cvSet(img,cvScalar(255-add));
25         cvResetImageROI(img);
26         interset_x +=10;
27         interset_y +=10;
28         offset_x -= 20;
29         offset_y -= 20;
30         add=add+20;
31     }
32 cvNamedWindow("jinzita",1);
33 cvShowImage("jinzita",img);
34 cvWaitKey(0);
35 cvDestroyWindow("jinzita");
36 cvReleaseImage(&img);
37 return(0);
38 }