opengl绘制空心圆柱体的代码

下面是OpenGL绘制空心圆柱体的代码：

void drawCylinder(float radius, float height, int segments)
{
    float angle = 0;
    float step = (2 * PI) / segments;
    
    // Draw top and bottom circles
    glBegin(GL_LINE_LOOP);
    for(int i = 0; i < segments; i++)
    {
        float x = radius * cos(angle);
        float y = radius * sin(angle);
        glVertex3f(x, y, height);
        angle += step;
    }
    glEnd();
    
    glBegin(GL_LINE_LOOP);
    angle = 0;
    for(int i = 0; i < segments; i++)
    {
        float x = radius * cos(angle);
        float y = radius * sin(angle);
        glVertex3f(x, y, 0);
        angle += step;
    }
    glEnd();
    
    // Draw sides
    glBegin(GL_LINES);
    angle = 0;
    for(int i = 0; i < segments; i++)
    {
        float x = radius * cos(angle);
        float y = radius * sin(angle);
        glVertex3f(x, y, 0);
        glVertex3f(x, y, height);
        angle += step;
    }
    glEnd();
}

这个函数接受圆柱体的半径、高度和分段数作为参数，使用OpenGL绘制一个空心圆柱体。函数使用GL_LINE_LOOP和GL_LINES绘制圆柱体的顶部、底部和侧面。