作业week4 Pong！

#!/usr/bin/env python# -*- coding: utf-8 -*-"""__title__ = 'Pong'__author__ = 'Steve'__mtime__ = '2017/9/27'"""# Impelementation of classic arcade game Pongimport SimpleGUICS2Pygame.simpleguics2pygame as simpleguiimport random# initialize globals - pos and vel encode vertical info for paddlesWIDTH = 600HEIGHT = 400BALL_RADIUS = 20PAD_WIDTH = 8PAD_HEIGHT = 80HALF_PAD_WIDTH = PAD_WIDTH / 2HALF_PAD_HEIGHT = PAD_HEIGHT / 2LEFT = FalseRIGHT = Trueball_vel = [0, 0]ball_pos = [0, 0]paddle1_pos = HEIGHT / 2 - HALF_PAD_HEIGHTpaddle2_pos = HEIGHT / 2 - HALF_PAD_HEIGHTpaddle1_vel = 0paddle2_vel = 0score1 = 0score2 = 0# initialize ball_pos and ball_vel for new bal in middle of table# if direction is RIGHT, the ball's velocity is upper right, else upper leftdef spawn_ball(direction):    global ball_pos, ball_vel  # these are vectors stored as lists    ball_pos = [WIDTH / 2, HEIGHT / 2]    ball_vel = [random.randrange(3, 5), random.randrange(1, 5)]    if direction == LEFT:        ball_vel[0] = -ball_vel[0]# define event handlersdef new_game():    global paddle1_pos, paddle2_pos, paddle1_vel, paddle2_vel  # these are numbers    global score1, score2  # these are ints    score1 = 0    score2 = 0    spawn_ball(random.choice([LEFT, RIGHT]))def draw(c):    global score1, score2, paddle1_pos, paddle2_pos, ball_pos, ball_vel, paddle1_vel, paddle2_vel    # draw mid line and gutters    c.draw_line([WIDTH / 2, 0], [WIDTH / 2, HEIGHT], 1, "White")    c.draw_line([PAD_WIDTH, 0], [PAD_WIDTH, HEIGHT], 1, "White")    c.draw_line([WIDTH - PAD_WIDTH, 0], [WIDTH - PAD_WIDTH, HEIGHT], 1, "White")    if score1 < 5 and score2 < 5:  # 先得5分获胜        # update ball        ball_pos[0] += ball_vel[0]        ball_pos[1] += ball_vel[1]        if (ball_pos[1] <= BALL_RADIUS) or (ball_pos[1] >= HEIGHT - BALL_RADIUS):            ball_vel[1] = -ball_vel[1]        if ball_pos[0] <= BALL_RADIUS:            if paddle1_pos <= ball_pos[1] <= paddle1_pos + PAD_HEIGHT:                ball_vel[0] = -ball_vel[0]                ball_vel[0] = ball_vel[0] * 1.1                ball_vel[1] = ball_vel[1] * 1.1            else:                spawn_ball(LEFT)                score2 += 1        elif ball_pos[0] >= WIDTH - BALL_RADIUS - 1:            if paddle2_pos <= ball_pos[1] <= paddle2_pos + PAD_HEIGHT:                ball_vel[0] = -ball_vel[0]                ball_vel[0] = ball_vel[0] * 1.1                ball_vel[1] = ball_vel[1] * 1.1            else:                spawn_ball(RIGHT)                score1 += 1        # draw ball        c.draw_circle(ball_pos, BALL_RADIUS, 1, "Grey", "White")    else:        if score1 >= 5:            winner = "The left player wins!"        else:            winner = "The right player wins!"        c.draw_polygon([[WIDTH / 2 - 150, HEIGHT / 2 - 100], [WIDTH / 2 + 150, HEIGHT / 2 - 100], [WIDTH / 2 + 150, HEIGHT / 2 - 50], [WIDTH / 2 - 150, HEIGHT / 2 - 50]], 5, "Red", "White")        c.draw_text(winner, [WIDTH / 2 - 115, HEIGHT / 2 - 70], 30, "Red")    # update paddle's vertical position, keep paddle on the screen    paddle1_pos += paddle1_vel    paddle2_pos += paddle2_vel    if paddle1_pos <= 0 or paddle1_pos >= HEIGHT - PAD_HEIGHT:        paddle1_vel = 0    if paddle2_pos <= 0 or paddle2_pos >= HEIGHT - PAD_HEIGHT:        paddle2_vel = 0    # draw paddles    c.draw_polygon([[0, paddle1_pos], [PAD_WIDTH, paddle1_pos], [PAD_WIDTH, paddle1_pos + PAD_HEIGHT],[0, paddle1_pos + PAD_HEIGHT]], 1, "White", "White")    c.draw_polygon([[WIDTH - PAD_WIDTH, paddle2_pos], [WIDTH, paddle2_pos], [WIDTH, paddle2_pos + PAD_HEIGHT], [WIDTH - PAD_WIDTH, paddle2_pos + PAD_HEIGHT]], 1, "White", "White")    # draw scores    c.draw_text((str(score1) + "      " + str(score2)), [WIDTH / 2 - 100, HEIGHT / 2 + 20], 80, "White")def keydown(key):    global paddle1_vel, paddle2_vel    vel = 5    if key == simplegui.KEY_MAP['w']:        paddle1_vel = -vel    elif key == simplegui.KEY_MAP['s']:        paddle1_vel = vel    elif key == simplegui.KEY_MAP['up']:        paddle2_vel = -vel    elif key == simplegui.KEY_MAP['down']:        paddle2_vel = veldef keyup(key):    global paddle1_vel, paddle2_vel    if key == simplegui.KEY_MAP['w']:        paddle1_vel = 0    elif key == simplegui.KEY_MAP['s']:        paddle1_vel = 0    elif key == simplegui.KEY_MAP['up']:        paddle2_vel = 0    elif key == simplegui.KEY_MAP['down']:        paddle2_vel = 0def resetgame():    new_game()# create frameframe = simplegui.create_frame("Pong", WIDTH, HEIGHT)frame.set_draw_handler(draw)frame.set_keyup_handler(keyup)frame.set_keydown_handler(keydown)button_res = frame.add_button("Reset", resetgame, 200)# start framenew_game()frame.start()