Draw Circle in OpenGL
glColor3f(0.92,0.93,0.38); // (R,G,B) glBegin(GL_TRIANGLE_FAN); for(int ii = 0; ii < 300; ii++) { float cx = 35; //X coordinate float cy = 250; //y coordinate float r = 30.0; //radius float theta = 2.0f * 3.1415926f * float(ii) / float(300);//get the current angle float x = (r-45) * cosf(theta);//calculate the x component float y = r * sinf(theta);//calculate the y component glVertex2f(x + cx, y + cy);//output vertex } glEnd();