opengl扁圆 填充色 源代码

opengl椭圆 填充色 源代码
#include<windows.h>
#include<math.h>
#include <gl/Glut.h>
#include <iostream>

using namespace std;



void myDisplay(void);
void myInit(void);
void setWindow(GLdouble left, GLdouble right, GLdouble botton, GLdouble top);
void drawEllipse(GLint W, GLint H, GLdouble clr[3]);

const GLint screenWidth = 640;
const GLint screenHeight = 640;
const GLdouble PI = 3.1415926;
static GLint size = 300;

int main(int argc, char ** argv){
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
    glutInitWindowSize(screenWidth,screenHeight);
    glutInitWindowPosition(100,100);
    glutCreateWindow("Ellipse");

    glutDisplayFunc(myDisplay);
    myInit();
    glutMainLoop();

    return 0;
}

void setWindow(GLdouble left, GLdouble right, GLdouble botton, GLdouble top){
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(left,right,botton,top);
}


void myDisplay(void){
    glClear(GL_COLOR_BUFFER_BIT);
    setWindow(0.0,(GLdouble)screenWidth,0.0,(GLdouble)screenHeight);

    GLdouble color [3] = {0.0f,0.0f,0.0f};
    drawEllipse(250,180,color);
    GLdouble color2 [3] = {1.0f,1.0f,1.0f};
    drawEllipse(170,170,color2);
    GLdouble color3 [3] = {0.0f,0.0f,0.0f};
    drawEllipse(160,100,color3);
    GLdouble color4 [3] = {1.0f,1.0f,1.0f};
    drawEllipse(90,90,color4);

}

void drawEllipse(GLint W, GLint H, GLdouble clr[3]){
    
    glColor3f(clr[0],clr[1],clr[2]);
    /*glBegin(GL_LINE_LOOP);

    for (GLdouble i = 0.0; i< 2*PI ; i += 0.01 )
    {
    glVertex2d(310+W * cos(i), 310+H * sin(i));
    }

    glEnd();
    */


    glBegin(GL_LINES);

    for (GLdouble i = 0.00; i< 2*PI ; i += 0.005 )
    {
        glVertex2d(310.0,310.0);
        glVertex2d((GLdouble)310+W * cos(i),(GLdouble)310+H * sin(i));
    }
    glEnd();

    glFlush();    
}

void myInit(void){
    glClearColor(1.0,1.0,1.0,0.0);
    glColor3f(0.0f, 0.0f, 0.0f);        
    glLineWidth(2.0);
    glPointSize(1.0);
    

}