Kivy 乒乓游戏教程 基于Minconda或Anconda 运行

文章目录

• • [Kivy 乒乓游戏教程 基于Minconda或Anconda 运行](#Kivy 乒乓游戏教程 基于Minconda或Anconda 运行)
  • • 为什么写这篇笔记
    • • 扩展阅读
    • 笔者环境
    • 安装`Kivy`
    • • 参考
    • 运行演示
    • 乒乓球游戏教程
    • • main.py
      • pong.kv

Kivy 乒乓游戏教程 基于Minconda或Anconda 运行

为什么写这篇笔记

Python部署Android软件apk或者aak早有耳闻，而Kivy就是其中最臭名昭著的(开玩笑)，所以有了这篇用于展示 乒乓游戏教程 的文章

不过这篇文章 不会讲解具体的代码 逻辑以及意义，只是单纯的测试与演示 ，有望在其他文章中编写

扩展阅读

Kivy应用程序

笔者环境

• 系统环境： Fedora Linux 42 (Workstation Edition)
• Python环境： Python 3.13.X
• Conda/Minconda环境：conda 25.7.0

安装Kivy

因为笔者的环境是 Linux上的Minconda所以使用如下命令

conda install kivy -c conda-forge

参考

Anconda安装Kivy

其他各种平台安装

运行演示

乒乓球游戏教程

下面的俩个文件要在同一文件夹下

main.py

from kivy.app import App
from kivy.uix.widget import Widget
from kivy.properties import (
    NumericProperty, ReferenceListProperty, ObjectProperty
)
from kivy.vector import Vector
from kivy.clock import Clock


class PongPaddle(Widget):
    score = NumericProperty(0)

    def bounce_ball(self, ball):
        if self.collide_widget(ball):
            vx, vy = ball.velocity
            offset = (ball.center_y - self.center_y) / (self.height / 2)
            bounced = Vector(-1 * vx, vy)
            vel = bounced * 1.1
            ball.velocity = vel.x, vel.y + offset


class PongBall(Widget):
    velocity_x = NumericProperty(0)
    velocity_y = NumericProperty(0)
    velocity = ReferenceListProperty(velocity_x, velocity_y)

    def move(self):
        self.pos = Vector(*self.velocity) + self.pos


class PongGame(Widget):
    ball = ObjectProperty(None)
    player1 = ObjectProperty(None)
    player2 = ObjectProperty(None)

    def serve_ball(self, vel=(4, 0)):
        self.ball.center = self.center
        self.ball.velocity = vel

    def update(self, dt):
        self.ball.move()

        # bounce off paddles
        self.player1.bounce_ball(self.ball)
        self.player2.bounce_ball(self.ball)

        # bounce ball off bottom or top
        if (self.ball.y < self.y) or (self.ball.top > self.top):
            self.ball.velocity_y *= -1

        # went off to a side to score point?
        if self.ball.x < self.x:
            self.player2.score += 1
            self.serve_ball(vel=(4, 0))
        if self.ball.right > self.width:
            self.player1.score += 1
            self.serve_ball(vel=(-4, 0))

    def on_touch_move(self, touch):
        if touch.x < self.width / 3:
            self.player1.center_y = touch.y
        if touch.x > self.width - self.width / 3:
            self.player2.center_y = touch.y


class PongApp(App):
    def build(self):
        game = PongGame()
        game.serve_ball()
        Clock.schedule_interval(game.update, 1.0 / 60.0)
        return game


if __name__ == '__main__':
    PongApp().run()

pong.kv

#:kivy 1.0.9

<PongBall>:
    size: 50, 50 
    canvas:
        Ellipse:
            pos: self.pos
            size: self.size          

<PongPaddle>:
    size: 25, 200
    canvas:
        Rectangle:
            pos: self.pos
            size: self.size

<PongGame>:
    ball: pong_ball
    player1: player_left
    player2: player_right
    
    canvas:
        Rectangle:
            pos: self.center_x - 5, 0
            size: 10, self.height
    
    Label:
        font_size: 70  
        center_x: root.width / 4
        top: root.top - 50
        text: str(root.player1.score)
        
    Label:
        font_size: 70  
        center_x: root.width * 3 / 4
        top: root.top - 50
        text: str(root.player2.score)
    
    PongBall:
        id: pong_ball
        center: self.parent.center
        
    PongPaddle:
        id: player_left
        x: root.x
        center_y: root.center_y
        
    PongPaddle:
        id: player_right
        x: root.width - self.width
        center_y: root.center_y