天天向上

  (1) Circle

    CvSize ImageSize1 = cvSize(1000,700);
    IplImage* Image1 = cvCreateImage(ImageSize1,IPL_DEPTH_8U,1);
    cvNot(Image1,Image1);
    CvPoint CircleCenter = cvPoint(500,350);
    int Radius = 300;
    CvScalar Color = CV_RGB(0,0,0);
    int Thickness = CV_FILLED;
    int Shift;
    cvCircle(Image1,CircleCenter,Radius,Color,Thickness,CV_AA,Shift);

    cvNamedWindow("Circle",1);
    cvShowImage("Circle",Image1);
    cvWaitKey(0);

//-------------------------------------------------------------------------------

    (2) Ellipse

    IplImage *Image1;
    IplImage *Image2;
    
    CvPoint CircleCenter;
    CvSize EllipseAxes;
    double RotateAngle;
    double StartDrawingAngle;
    double StopDrawingAngle;
    CvScalar Color;
    int Thickness = CV_FILLED;
    int Shift;
   
    CvSize ImageSize1 = cvSize(640, 480);
    Image1 = cvCreateImage(ImageSize1,IPL_DEPTH_8U,3);
    Image2 = cvCreateImage(ImageSize1,IPL_DEPTH_8U,1);

    CircleCenter=cvPoint((gl_rect.left+gl_rect.right)/2, (gl_rect.top+gl_rect.Bottom)/2);
    EllipseAxes=cvSize((gl_rect.right-gl_rect.left)/2, (gl_rect.Bottom-gl_rect.top)/2);
    RotateAngle=0;
    StartDrawingAngle=0;
    StopDrawingAngle=360;
    Color=CV_RGB(255,255,255);
    Shift=0;


    cvEllipse(Image1,CircleCenter,EllipseAxes,RotateAngle,
                 StartDrawingAngle,StopDrawingAngle,Color,Thickness,CV_AA,Shift);
    cvCvtColor( Image1, Image2, CV_BGR2GRAY);
    

  
    cvNamedWindow("Ellipse",1);
    cvShowImage("Ellipse",Image2);
    cvReleaseImage( &Image1);
    cvReleaseImage( &Image2);