opengl draw cresent moon c++
//first circle moon int moonr = 50; int mooncenterx = 700; int mooncentery = 500; int moonsteps = 100; float circleangle = PI * 2.0f; glColor3f(1.0, 1.0, 1.0); glBegin(GL_TRIANGLE_FAN); for (int a = 0; a <= moonsteps; a++) { float angle = circleangle * float(a) / float(moonsteps);//get the current angl float moonx = moonr * cosf(angle);//calculate the x component float moony = moonr * sinf(angle);//calculate the y component glVertex2f(moonx + mooncenterx, moony + mooncentery);//output vertex } glEnd(); //second circle moon int moon2r = 50; int mooncenter2x = 725; int mooncenter2y = 525; int moonsteps2 = 100; float circleangle2 = PI * 2.0f; glColor3f(0.5, 0.9, 0.4); glBegin(GL_TRIANGLE_FAN); for (int b = 0; b <= moonsteps; b++) { float angle2 = circleangle * float(b) / float(moonsteps2);//get the current angle float moon2x = moonr * cosf(angle2);//calculate the x component float moon2y = moonr * sinf(angle2);//calculate the y component glVertex2f(moon2x + mooncenter2x, moon2y + mooncenter2y);//output vertex } glEnd();