Python - Bounce!(Finishing Your First Game: Bounce!, Accelerate the Ball)

Python for Kids:
A Playful Introduction to Programming
(No Starch Press)
Jason R. Briggs (著)
邦訳

開発環境

• OS X El Capitan - Apple (OS)
• Emacs (Text Editor)
• Python 3.5 (プログラミング言語)

Python for Kids: A Playful Introduction to Programming (Jason R. Briggs (著) 、No Starch Press)のPart Ⅱ.(Bounce!)、Chapter 14.(Finishing Your First Game: Bounce!)、Programming Puzzles #3: Accelerate the Ball(No. 4090)を解いてみる。

Programming Puzzles #3: Accelerate the Ball(No. 4090)

コード(Emacs)

#!/usr/bin/env python3
#-*- coding: utf-8 -*-

import tkinter
import tkinter.font
import random
import time

class Paddle:
    def __init__(self, canvas, color):
        self.canvas = canvas
        self.id = canvas.create_rectangle(0, 0, 100, 10, fill=color)
        self.canvas.move(self.id, 200, 300)
        self.x = 0
        self.canvas_width = self.canvas.winfo_width()
        self.started = False
        self.canvas.bind_all('<KeyPress Left>', self.turn_left)
        self.canvas.bind_all('<KeyPress Right>', self.turn_right)
        self.canvas.bind_all('<Button-1>', self.start)

    def turn_left(self, evt):
        self.x = -2
        
    def turn_right(self, evt):
        self.x = 2

    def start(self, evt):
        self.started = True
        
    def draw(self):
        self.canvas.move(self.id, self.x, 0)
        pos = self.canvas.coords(self.id)
        if pos[0] <= 0:
            self.x = 0
        elif pos[2] >= self.canvas_width:
            self.x = 0

class Ball:
    def __init__(self, canvas, paddle, color):
        self.canvas = canvas
        self.paddle = paddle
        self.id = canvas.create_oval(10, 10, 25, 25, fill=color)
        self.canvas.move(self.id, 245, 100)
        starts = [-3, -2, -1, 1, 2, 3]
        random.shuffle(starts)
        self.x = starts[0]
        self.y = -3
        self.canvas_height = self.canvas.winfo_height()
        self.canvas_width = self.canvas.winfo_width()
        self.hit_bottom = False

    def draw(self):
        self.canvas.move(self.id, self.x, self.y)
        pos = self.canvas.coords(self.id)
        if pos[1] <= 0:
            self.y = 3
        if pos[3] >= self.canvas_height:
            self.hit_bottom = True
        if self.hit_paddle(pos):
            self.y = -3
        if pos[0] <= 0:
            self.x = 3
        if pos[2] >= self.canvas_width:
            self.x = -3
            
    def hit_paddle(self, pos):
        paddle_pos = self.canvas.coords(self.paddle.id)
        if pos[2] >= paddle_pos[0] and pos[0] <= paddle_pos[2]:
            if paddle_pos[1] <= pos[3] <= paddle_pos[3]:
                self.x += self.paddle.x
                return True
        return False
    
if __name__ == '__main__':
    tk = tkinter.Tk()
    tk.title('Game')
    tk.resizable(0, 0)
    tk.wm_attributes('-topmost', 1)
    canvas = tkinter.Canvas(tk, width=500, height=400,
                            bd=0, highlightthickness=0)
    canvas.pack()
    tk.update()
    
    paddle = Paddle(canvas, 'blue')
    ball = Ball(canvas, paddle, 'red')    
    text_game_over = canvas.create_text(250, 200, text='Game Over',
                                        font=tkinter.font.Font(weight='bold'),
                                        state=tkinter.HIDDEN)
    while 1:
        if (not ball.hit_bottom) and paddle.started:
            ball.draw()
            paddle.draw()
        if ball.hit_bottom:
            canvas.itemconfig(text_game_over, state=tkinter.NORMAL)
        tk.update_idletasks()
        tk.update()
        time.sleep(0.01)

入出力結果(Terminal, IPython)

$ ./sample3.py
  C-c C-cTraceback (most recent call last):
  File "./sample3.py", line 97, in <module>
    time.sleep(0.01)
KeyboardInterrupt
$