Pong

原创
2012/11/10 23:30
阅读数 179
# Implementation of classic arcade game Pong
# by Sean

import simplegui
import random

# initialize globals - pos and vel encode vertical info for paddles
WIDTH = 600
HEIGHT = 400       
BALL_RADIUS = 20
PAD_WIDTH = 8
PAD_HEIGHT = 80
HALF_PAD_WIDTH = PAD_WIDTH / 2
HALF_PAD_HEIGHT = PAD_HEIGHT / 2

# function that spawns a ball, returns a position vector and a velocity vector
# if right is True, spawn to the right, else spawn to the left
def ball_init(right):
    global ball_pos, ball_vel # these are vectors stored as lists
    ball_pos = [WIDTH / 2, HEIGHT / 2]
    if right:
        balldir = 1
    else:
        balldir = -1
    ball_vel = [random.randrange(120, 240) * balldir / 60, -random.randrange(60, 180) / 60] 

# define event handlers
def init():
    global paddle1_pos, paddle2_pos, paddle1_vel, paddle2_vel  # these are floats
    global score1, score2  # these are ints
    global right
    
    score1 = 0
    score2 = 0
    paddle1_pos = float(HEIGHT / 2)
    paddle2_pos = float(HEIGHT / 2)
    paddle1_vel = 0.0
    paddle2_vel = 0.0
    
    right = random.choice([True, False])
    ball_init(right)

def draw(c):
    global score1, score2, paddle1_pos, paddle2_pos, ball_pos, ball_vel, paddle1_vel, paddle2_vel, right
    # update paddle's vertical position, keep paddle on the screen
    if paddle1_vel < 0:
        if paddle1_pos > HALF_PAD_HEIGHT:
            paddle1_pos += paddle1_vel
    if paddle1_vel > 0:
        if paddle1_pos < (HEIGHT - 1) - HALF_PAD_HEIGHT:
            paddle1_pos += paddle1_vel
    if paddle2_vel < 0:
        if paddle2_pos > HALF_PAD_HEIGHT:
            paddle2_pos += paddle2_vel
    if paddle2_vel > 0:
        if paddle2_pos < (HEIGHT - 1) - HALF_PAD_HEIGHT:
            paddle2_pos += 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")
    
    # draw paddles
    c.draw_polygon(([0, paddle1_pos - HALF_PAD_HEIGHT], [PAD_WIDTH - 1, paddle1_pos - HALF_PAD_HEIGHT], \
                    [PAD_WIDTH - 1, paddle1_pos + HALF_PAD_HEIGHT], [0, paddle1_pos + HALF_PAD_HEIGHT]), 2, "White", "White")
    c.draw_polygon(([WIDTH - PAD_WIDTH, paddle2_pos - HALF_PAD_HEIGHT], [WIDTH - 1, paddle2_pos - HALF_PAD_HEIGHT], \
                    [WIDTH - 1, paddle2_pos + HALF_PAD_HEIGHT], [WIDTH - PAD_WIDTH, paddle2_pos + HALF_PAD_HEIGHT]), 2, "White", "White")
     
    # update ball
    if ball_pos[1] <= BALL_RADIUS:
        ball_vel[1] = -ball_vel[1]
    if ball_pos[1] >= (HEIGHT - 1) - BALL_RADIUS:
        ball_vel[1] = -ball_vel[1]
        
    if ball_pos[0] <= PAD_WIDTH + BALL_RADIUS:
        if paddle1_pos - HALF_PAD_HEIGHT <= ball_pos[1] <= paddle1_pos + HALF_PAD_HEIGHT:
            ball_vel[0] = -ball_vel[0]
            ball_vel[0] *= 1.1
            ball_vel[1] *= 1.1
        else:
            right = True
            ball_init(right)
            score2 += 1
    
    if ball_pos[0] >= (WIDTH - 1) - PAD_WIDTH - BALL_RADIUS:
        if paddle2_pos - HALF_PAD_HEIGHT <= ball_pos[1] <= paddle2_pos + HALF_PAD_HEIGHT:
            ball_vel[0] = -ball_vel[0]
            ball_vel[0] *= 1.1
            ball_vel[1] *= 1.1
        else:
            right = False
            ball_init(right)
            score1 += 1
        
    ball_pos[0] += ball_vel[0]
    ball_pos[1] += ball_vel[1]
    # draw ball and scores
    c.draw_circle(ball_pos, BALL_RADIUS, 2, "White", "White")
    c.draw_text(str(score1), [150, 100], 40, "White")
    c.draw_text(str(score2), [415, 100], 40, "White")
        
def keydown(key):
    global paddle1_vel, paddle2_vel
    if key == simplegui.KEY_MAP["w"]:
        paddle1_vel -= 3
    elif key == simplegui.KEY_MAP["s"]:
        paddle1_vel += 3
    elif key == simplegui.KEY_MAP["up"]:
        paddle2_vel -= 3
    elif key == simplegui.KEY_MAP["down"]:
        paddle2_vel += 3
   
def keyup(key):
    global paddle1_vel, paddle2_vel
    if key == simplegui.KEY_MAP["up"]:
        paddle2_vel += 3
    elif key == simplegui.KEY_MAP["down"]:
        paddle2_vel -= 3
    elif key == simplegui.KEY_MAP["w"]:
        paddle1_vel += 3
    elif key == simplegui.KEY_MAP["s"]:
        paddle1_vel -= 3

# create frame
frame = simplegui.create_frame("Pong", WIDTH, HEIGHT)
frame.set_draw_handler(draw)
frame.set_keydown_handler(keydown)
frame.set_keyup_handler(keyup)
frame.add_button("Restart", init, 100)

# start frame
init()
frame.start()
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