使用panda3d输出简单的贪吃蛇游戏

好的，以下是一个简单的贪吃蛇游戏的代码示例：

from direct.showbase.ShowBase import ShowBase
from direct.interval.IntervalGlobal import Sequence, Func, Wait
from panda3d.core import TextNode, NodePath
from random import randint

class SnakeGame(ShowBase):
    def __init__(self):
        ShowBase.__init__(self)

        # 设置窗口标题和大小
        self.setWindowTitle("Snake Game")
        self.win.setFixedSize(400, 400)

        # 添加背景图片
        bg = self.loader.loadTexture("background.png")
        self.bg = self.render2d.attachNewNode("background")
        self.bg.setTexture(bg)

        # 添加文字节点
        self.score = 0
        self.scoreText = TextNode("score")
        self.scoreText.setText("Score: %s" % self.score)
        self.scoreNP = self.aspect2d.attachNewNode(self.scoreText)
        self.scoreNP.setScale(0.1)
        self.scoreNP.setPos(-1.2, 0, -0.8)

        # 添加贪吃蛇节点
        self.snake = []
        self.snakeNP = NodePath("snake")
        self.snakeNP.reparentTo(self.render)
        for i in range(3):
            body = self.loader.loadModel("snakeBody.egg")
            body.setPos(i, 0, 0)
            body.reparentTo(self.snakeNP)
            self.snake.append(body)

        # 添加食物节点
        self.foodNP = self.loader.loadModel("food.egg")
        self.foodNP.reparentTo(self.render)
        self.randomizeFood()

        # 设置键盘响应事件
        self.accept("arrow_left", self.turnLeft)
        self.accept("arrow_right", self.turnRight)
        self.accept("arrow_up", self.turnUp)
        self.accept("arrow_down", self.turnDown)

        # 开始游戏循环
        self.gameLoop()

    def gameLoop(self):
        # 计算下一帧的位置和角度
        head = self.snake[-1]
        angle = head.getH()
        x, y, z = head.getPos()
        if angle == 0:
            x += 1
        elif angle == 180:
            x -= 1
        elif angle == 90:
            y += 1
        elif angle == 270:
            y -= 1

        # 判断是否吃到食物
        if (x, y, z) == self.foodNP.getPos():
            self.score += 10
            self.scoreText.setText("Score: %s" % self.score)
            self.randomizeFood()
            body = self.loader.loadModel("snakeBody.egg")
            body.setPos(self.snake[-1].getPos())
            body.reparentTo(self.snakeNP)
            self.snake.append(body)
        else:
            # 移动贪吃蛇
            for i in range(len(self.snake) - 1):
                self.snake[i].setPos(self.snake[i + 1].getPos())
            head.setPos(x, y, z)

        # 判断游戏是否结束
        if self.checkCollision():
            self.gameOver()
            return

        # 延迟一定时间后继续游戏循环
        Sequence(Wait(0.1), Func(self.gameLoop)).start()

    def turnLeft(self):
        self.snake[-1].setH(180)

    def turnRight(self):
        self.snake[-1].setH(0)

    def turnUp(self):
        self.snake[-1].setH(90)

    def turnDown(self):
        self.snake[-1].setH(270)

    def randomizeFood(self):
        x = randint(-19, 19)
        y = randint(-19, 19)
        z = 0
        self.foodNP.setPos(x, y, z)

    def checkCollision(self):
        # 判断是否撞墙
        head = self.snake[-1]
        x, y, z = head.getPos()
        if abs(x) > 19 or abs(y) > 19:
            return True

        # 判断是否碰到自己的身体
        for body in self.snake[:-1]:
            if (x, y, z) == body.getPos():
                return True

        return False

    def gameOver(self):
        # 清除键盘响应事件
        self.ignore("arrow_left")
        self.ignore("arrow_right")
        self.ignore("arrow_up")
        self.ignore("arrow_down")

        # 显示游戏结束的文字
        gameoverText = TextNode("gameover")
        gameoverText.setText("Game Over")
        gameoverNP = self.aspect2d.attachNewNode(gameoverText)
        gameoverNP.setScale(0.2)
        gameoverNP.setPos(0, 0, 0)

if __name__ == "__main__":
    game = SnakeGame()
    game.run()

在这个例子中，我们使用了 Panda3D 引擎来创建游戏窗口，并添加了背景图片、贪吃蛇、食物和文字节点。我们还实现了键盘响应事件来控制贪吃蛇的移动，并且在游戏循环中计算贪吃蛇的下一帧位置和角度，判断是否吃到食物，移动贪吃蛇，判断游戏是否结束，以及延迟一定时间后继续游戏循环。最后，我们在游戏结束时清除键盘响应事件并显示游戏结束的文字。