Import necessary modules

导入必要的模块

import os from direct.showbase.ShowBase import ShowBase # 导入ShowBase类 from panda3d.core import WindowProperties # 导入WindowProperties类 from direct.showbase.ShowBase import ShowBase # 导入ShowBase类 from panda3d.core import Vec3 # 导入Vec3类 from direct.task import Task # 导入Task类 from direct.actor.Actor import Actor # 导入Actor类 from panda3d.core import DirectionalLight # 导入DirectionalLight类 from panda3d.core import Point3 # 导入Point3类 from panda3d.core import WindowProperties # 导入WindowProperties类 from win32api import GetSystemMetrics import pyautogui

Create a class that inherits from ShowBase

创建一个继承自ShowBase的类

class MyApp(ShowBase): def init(self): ShowBase.init(self)

    # 加载场景模型（场景树）
    self.scene = self.loader.loadModel("models/environment")  # 加载名为"models/environment"的模型
    # 将render设为场景模型的父节点
    self.scene.reparentTo(self.render)  # 将场景模型的父节点设置为render

    # 改变场景大小，并设置镜头初始位置
    self.scene.setScale(0.25, 0.25, 0.25)  # 缩小场景模型
    self.scene.setPos(-8, 42, 0)  # 设置场景模型的位置
    # Disable the mouse cursor
    # 禁用鼠标光标
    #props = WindowProperties()
    #props.setCursorHidden(True)
    #self.win.requestProperties(props)
    self.isDragging = False  # 初始化isDragging为False
    self.edge=False
    self.camera_distance = 5 # 摄像机距离(x, y, z)点的距离
    self.camera_target = Point3(0, 0, 0) # 摄像机的目标点
    self.camera_theta = 0 # 摄像机的极角
    self.camera_phi = 0 # 摄像机的方位角
    self.update_camera() # 更新摄像机位置和朝向
    # Set up the camera
    # 设置相机
    self.disableMouse()  # 禁用鼠标
    self.taskMgr.add(self.rotateCameraTask, "rotateCameraTask")  # 添加rotateCameraTask任务
    pyautogui.mouseUp(button='middle')
    pyautogui.mouseUp(button='left')
    pyautogui.mouseUp(button='right')
def stopDrag(self):
    if self.isDragging == True:
        try:
            pyautogui.mouseUp(button='middle')
        except:
            pass
        self.isDragging = False  # 将isDragging设置为False
        wp = WindowProperties()  # 创建WindowProperties对象
        #wp.setMouseMode(WindowProperties.M_relative)
        wp.setCursorHidden(False)  # 显示鼠标光标
        self.win.requestProperties(wp)  # 设置窗口属性
        self.win.movePointer(0, self.win.getXSize() // 2, self.win.getYSize() // 2)  # 将鼠标指针移动到窗口中心
    else:
        self.isDragging = True  # 将isDragging设置为True
        self.lastPosition = self.win.getPointer(0)  # 获取鼠标指针的位置
        #self.rotateCamera()
        self.disableMouse()  # 禁用鼠标
        wp = WindowProperties()  # 创建WindowProperties对象
        #wp.setMouseMode(WindowProperties.M_relative)
        wp.setCursorHidden(True)  # 隐藏鼠标光标
        #wp.setMouseEnclosed(True)
        self.win.requestProperties(wp)  # 设置窗口属性
        #self.win.setMouseVisible(False)
        pyautogui.mouseDown(button='middle')
def rotateCamera(self):
    if self.isDragging:
        currentPosition = self.win.getPointer(0)  # 获取鼠标指针的位置
        #print(self.camera.getHpr())
        if currentPosition.getX() >= self.win.getXSize() - 2 or currentPosition.getX() <= 2:
            print('碰到了窗口左或右边缘，，已将鼠标重新设置为窗口中心')
            self.edge = True
        elif currentPosition.getY() >= self.win.getYSize() - 2 or currentPosition.getY() <= 2:
            print('碰到了窗口上或下边缘，已将鼠标重新设置为窗口中心')
            self.edge = True
        else:
            self.edge=False
        if self.edge:
            self.win.movePointer(0, self.win.getXSize() // 2, self.win.getYSize() // 2)
            self.lastPosition = self.win.getPointer(0)  # 获取鼠标指针的位置
        else:
            deltaX = self.lastPosition.getX() - currentPosition.getX()  # 计算鼠标指针在x轴上的移动距离
            deltaY = self.lastPosition.getY() - currentPosition.getY()  # 计算鼠标指针在y轴上的移动距离
            self.camera_theta -= deltaY * 0.1 # 更新摄像机的极角
            self.camera_phi += deltaX * 0.1 # 更新摄像机的方位角
            if self.camera_theta < -85: # 避免摄像机翻转
                self.camera_theta = -85
            elif self.camera_theta > 85:
                self.camera_theta = 85
            self.update_camera() # 更新摄像机位置和朝向
            self.lastPosition = currentPosition  # 更新lastPosition的值


def rotateCameraTask(self, task):
    self.rotateCamera()  # 调用rotateCamera方法
    return task.cont  # 返回task.cont

def update_camera(self):
    # 计算摄像机位置
    x = self.camera_distance * math.sin(math.radians(self.camera_theta)) * math.cos(math.radians(self.camera_phi)) + self.camera_target.getX()
    y = self.camera_distance * math.sin(math.radians(self.camera_theta)) * math.sin(math.radians(self.camera_phi)) + self.camera_target.getY()
    z = self.camera_distance * math.cos(math.radians(self.camera_theta)) + self.camera_target.getZ()
    # 计算摄像机朝向
    self.camera.setPos(x, y, z)
    self.camera.lookAt(self.camera_target)

创建MyApp类的实例并运行应用程序

app = MyApp() # 创建MyApp类的实例 app.run() # 运行应用程