偶看新闻南田镇武阳村:opencv 画矩形
来源：百度文库 编辑：偶看新闻 时间：2024/06/12 23:17:04
OpenCV画矩形
#include "stdafx.h"
#include
#include
//#pragma comment(lib,"cv.lib")
//#pragma comment(lib,"cxcore.lib")
//#pragma comment(lib,"highgui.lib")
CvRect box;
bool Drawing=false;
void my_mouse_callback(int event, int x, int y, int flags, void* param);//实现对窗口Window_Name上的对象param添加鼠标响应操作
void DrawRect(IplImage*img,CvRect rect)
{
cvRectangle(img,cvPoint(box.x,box.y),cvPoint(box.x+box.width,box.y+box.height),cvScalar(0x00,0xff,0x00),2);
}
int main(int argc,char*argv[])
{
box=cvRect(0,0,-1,-1);
IplImage*img=cvCreateImage(cvSize(640,480),IPL_DEPTH_8U,3);
cvZero(img);
IplImage*temp=cvCloneImage(img);
cvNamedWindow("Draw_Rectangle",CV_WINDOW_AUTOSIZE);
cvSetMouseCallback("Draw_Rectangle",my_mouse_callback,(void*)img);//设置鼠标事件回调函数
while(1)
{
cvCopyImage(img,temp);
if(Drawing)
DrawRect(temp,box);
cvShowImage("Draw_Rectangle",temp);
if(cvWaitKey(100)==27)
break;
}
cvReleaseImage(&img);
cvReleaseImage(&temp);
cvDestroyWindow("Draw_Rectangle");
return 0;
}
void my_mouse_callback(int event,int x,int y,int flags,void*param)
{
IplImage*img=(IplImage*)param;
switch(event)
{
case CV_EVENT_MOUSEMOVE:
{
if(Drawing)
{
box.width=x-box.x;
box.height=y-box.y;
}
}
break;
case CV_EVENT_LBUTTONDOWN:
{
Drawing=true;
box=cvRect(x,y,0,0);
}
break;
case CV_EVENT_LBUTTONUP:
{
Drawing=false;
if (box.width<0)
{
box.x+=box.width;
box.width*=-1;
}
if (box.height<0)
{
box.y+=box.height;
box.height*=-1;
}
DrawRect(img,box);
}
break;
}
}