Ellipse

#include<windows.h>

#include<gl.h>

#include<glu.h>

#include<glut.h>

#include <math.h>

void Display ()

{              glClear(GL_COLOR_BUFFER_BIT);

                GLUquadricObj * quadricObj;                     //Creates a quadratic object

                quadricObj = gluNewQuadric();                 //Sets a pointer to a new quadratic object

                gluQuadricDrawStyle(quadricObj, GLU_FILL);

               

                glColor3f (0.0, 1.0, 0.0);                                  //Sets ellipse color  to green

                glScalef(0.7, 1.5, 1.0);                                     //Scales the ellipse

                //glColor3f (1.0, 0.0, 0.0);                              //Red ellipse

                //glScalef(1.4, 0.7, 1.0);

                //glColor3f (0.0, 0.0, 1.0);                              //Blue ellipse

                //glScalef(0.4, 1.6, 1.0);

               

                gluDisk(quadricObj, 0.0, 3.0, 100, 100);   //Sets the ellipse properties

                glFlush();

}

void init()

{

                glClearColor(0.0, 0.0, 0.0, 0.0);  //Sets background color to black

                glMatrixMode( GL_PROJECTION);

                glLoadIdentity();

                glOrtho(-8.0, 8.0, -8.0, 8.0, -8.0, 8.0);

}

void main( int argc, char **argv)

{

                glutInit ( &argc, argv);

                glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);

                glutInitWindowSize( 300, 300);

                glutInitWindowPosition( 200, 200);

                glutCreateWindow("Ellipses");

                init();

                glutDisplayFunc( Display );

                glutMainLoop();

}