当cvSetMouseCallback事件发生时，在IplImage上绘制圆圈 [英] Draw circle on IplImage when cvSetMouseCallback event occures

问题描述

我试图在用户点击图像的点上绘制圆圈。下面是我的代码..单击图像时没有绘制圆圈。但是当我添加

Iam trying to draw circles on points where the user clicks on the image..below is my code..it doesn''t draws the circle when clicked on the image.But when i add

cvCircle(shape,cvPoint(100,100),10,CV_RGB(0,255,0),-1);

在主函数内部它只绘制圆...（这里我手动给出了x，y坐标） ）

inside main function it just draws the circle...(here i have given the x,y coordinates manually)

IplImage* shape;

void mouseHandler(int event, int x, int y, int flags, void* param)
  {
    switch(event){
      case CV_EVENT_LBUTTONDOWN:
          printf("Left button clicked %i\ %i \n",x,y);
           cvCircle(shape,cvPoint(x,y),10,CV_RGB(0,255,0),-1);

          break;

      case CV_EVENT_RBUTTONDOWN:
        printf("Right BUTTON Clicked\n");
        break;

    }
}

int _tmain(int argc, _TCHAR* argv[])
{
   
    cvNamedWindow("Shapes",CV_WINDOW_AUTOSIZE);
     
    shape=cvLoadImage("bb.jpg");
    
      cvSetMouseCallback("Shapes",mouseHandler,0);

     
    cvShowImage("Shapes",shape);
    
    cvWaitKey(0);
   
    cvReleaseImage(&shape);
    cvDestroyAllWindows();

    return 0;
}

有谁知道原因？

谢谢

Does anyone know the reason?
Thankyou

推荐答案

我自己找到了解决方案..希望这会有所帮助....

i have found the solution myself..Hope this will help....

int xC,yC;
int *Xvalues = new int[15];
int *Yvalues = new int[15];
int count = 0;
bool drawing_circle = false;

< pr>

<pr>

void draw_circle(IplImage* img, int x,int y)
  {
         cvCircle(img,cvPoint(x,y),1,CV_RGB(0,255,0),-1);
	 Xvalues[count] = x;
	 Yvalues[count] = y;
	 count++;

    }
}

void my_mouse_callback( int event, int x, int y, int flags, void* param ){
	IplImage* image = (IplImage*) param;

	switch( event ){

		case CV_EVENT_LBUTTONDOWN:
			drawing_circle = true;
			xC = x;
			yC = y;
			break;
	}
}

int _tmain(int argc, _TCHAR* argv[])
{

    cvNamedWindow("Shapes",CV_WINDOW_AUTOSIZE);

    shape=cvLoadImage("bb.jpg");

    cvSetMouseCallback( name, my_mouse_callback, (void*) image);


    cvShowImage("Shapes",shape);
    
      while( 1 ){
		
		if( drawing_box ) 
		{
			draw_circle( image, xC,yC );
			
		}
    cvWaitKey(0);

    cvReleaseImage(&shape);
    cvDestroyAllWindows();

    return 0;
}

这篇关于当cvSetMouseCallback事件发生时，在IplImage上绘制圆圈的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！