绘制半长轴和半短轴分别为a,b的椭圆

绘制半长轴和半短轴分别为a,b的椭圆

//绘制半长轴和半短轴分别为a,b的椭圆
void ellipse(double a,double b)
{
   int n = 1000;  
    double t = 0.0;
    glBegin( GL_LINE_LOOP);  
        for  (int i = 0; i < n; ++i) 
        {
            t = i * 2 * 3.14159 / n;
            glVertex2f(a*cos(t), b*sin(t));
        }
    glEnd();
}