PyOpenGL如何使用鼠标旋转场景

from OpenGL.GL import *
from OpenGL.GLUT import *
from OpenGL.GLU import *

glutInit()  # 初始化GLUT库
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH)  # 设置显示模式
glutInitWindowSize(800, 600)  # 设置窗口大小
glutCreateWindow("PyOpenGL Mouse Rotation")  # 创建窗口并设置标题

def render_scene():
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)  # 清除颜色缓冲区和深度缓冲区
    glLoadIdentity()  # 重置当前矩阵为单位矩阵

    # 设置相机视角和位置
    gluLookAt(0, 0, 5, 0, 0, 0, 0, 1, 0)

    # 绘制场景对象
    # ...

    glutSwapBuffers()  # 切换缓冲区，显示渲染结果

def mouse_callback(button, state, x, y):
    if button == GLUT_LEFT_BUTTON and state == GLUT_DOWN:
        # 记录鼠标按下时的坐标
        # ...
    elif button == GLUT_LEFT_BUTTON and state == GLUT_UP:
        # 计算鼠标按下和释放时的坐标差，根据差值进行场景旋转
        # ...

glutDisplayFunc(render_scene)  # 注册场景渲染函数
glutMouseFunc(mouse_callback)  # 注册鼠标回调函数
glutMainLoop()  # 启动主循环