C++ opengl 绘制三角形扇

程序运行截图如下：

伪代码如下：

void Draw() {
    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);   //擦除背景使用的颜色（分别表示颜色分量的值）
    glClear(GL_COLOR_BUFFER_BIT);           //擦除当前背景颜色

    glBegin(GL_TRIANGLE_FAN);
    glColor4ub(255, 0, 0, 255); glVertex3f(0.0f, -0.25f, -2.5f);
    glColor4ub(0, 0, 255, 255); glVertex3f(0.5f, -0.25f, -2.5f);
    glColor4ub(0, 255, 0, 255); glVertex3f(0.4f, 0.0f, -2.5f);
    glColor4ub(0, 255, 0, 255); glVertex3f(0.2f, 0.15f, -2.5f);
    glColor4ub(0, 0, 255, 255); glVertex3f(0.0f, 0.2f, -2.5f);
    glEnd();
}