使用 python 构建 'Pong'（codeskulptor）

Question

我正在尝试使用 Python 在 CodeSkulptor 中构建街机游戏 'Pong'。我需要两件事的帮助

击中球拍时球速提高 10%
修复无法正常工作的颜色按钮

这是代码的 link：http://www.codeskulptor.org/#user41_yJMm4nMju5X5zvk.py

# Implementation of classic arcade game Pong
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
LEFT = False
RIGHT = True
score1 = 0
score2 = 0

#paddle position
paddle1_pos = HEIGHT/2 
paddle2_pos = HEIGHT/2

#paddle velocity
paddle1_vel = 0
paddle2_vel = 0

# initialize ball_pos and ball_vel for new bal in middle of table
ball_pos = [WIDTH/2 , HEIGHT/2]
ball_vel = [0 , 0]

#set color theme
color_palette = ['#FF5252','#00BCD4','#536DFE','#8BC34A','#FFC107','#FF9800','#FF4081','#E040FB']

color = random.choice(color_palette)

def color_red():
    color = color_palette[0]

def color_l_blue():
    color = color_palette[1]

def color_d_blue():
    color = color_palette[2]

def color_green():
    color = color_palette[3]

def color_yellow():
    color = color_palette[4]

def color_orange():
    color = color_palette[5]

def color_pink():
    color = color_palette[6]

def color_purple():
    color = color_palette[7]

def open_game():
    global ball_pos, ball_vel
    ball_pos = [WIDTH/2 , HEIGHT/2]
    ball_vel[0] = 0
    ball_vel[1] = 0

# if direction is RIGHT, the ball's velocity is upper right, else upper left
def start_game(direction):
    global ball_pos, ball_vel
    ball_pos = [WIDTH/2 , HEIGHT/2]

    if direction == RIGHT:
        ball_vel[0] = random.randrange(120,240)/60.0
        ball_vel[1] = -random.randrange(60,180)/60.0

    if direction == LEFT:
        ball_vel[0] = -random.randrange(120,240)/60.0
        ball_vel[1] = -random.randrange(60,180)/60.0

# define event handlers
def new_game():
    global paddle1_pos, paddle2_pos, paddle1_vel, paddle2_vel
    global score1, score2  
    paddle1_pos = HEIGHT/2  
    paddle2_pos = HEIGHT/2 
    open_game()
    score1 = 0
    score2 = 0

def draw(canvas):
    global score1, score2, paddle1_pos, paddle2_pos, ball_pos, ball_vel
    global paddle1_vel, paddle2_vel, PAD_HEIGHT, PAD_WIDTH, BALL_RADIUS,HALF_PAD_HEIGHT, HALF_PAD_WIDTH
    global color_palette, color

    # draw mid line and gutters
    canvas.draw_line([WIDTH / 2, 0],[WIDTH / 2, HEIGHT], 1, "White")
    canvas.draw_line([PAD_WIDTH, 0],[PAD_WIDTH, HEIGHT], 1, "White")
    canvas.draw_line([WIDTH - PAD_WIDTH, 0],[WIDTH - PAD_WIDTH, HEIGHT], 1, "White")

    # update ball
    ball_pos[0] += ball_vel[0]
    ball_pos[1] += ball_vel[1]

    #ball with upper and lower wall collisions
    if ball_pos[1] <= BALL_RADIUS:
        ball_vel[0] = ball_vel[0]
        ball_vel[1] = -ball_vel[1]
    if ball_pos[1] >= (HEIGHT-1)-BALL_RADIUS:
        ball_vel[0] = ball_vel[0]
        ball_vel[1] = -ball_vel[1]

    #spawn ball left or right    
    if ball_pos[0] <= BALL_RADIUS+PAD_WIDTH:
        start_game(RIGHT)
        score2 += 1
    if ball_pos[0] >= (WIDTH-1)-PAD_WIDTH-BALL_RADIUS:
        start_game(LEFT)
        score1 += 1

    # draw ball
    canvas.draw_circle(ball_pos, BALL_RADIUS, 2, color, color)

    #keep paddle on the screen
    if paddle1_pos-HALF_PAD_HEIGHT <= 0 and paddle1_vel < 0:
        paddle1_vel = 0
    if paddle2_pos-HALF_PAD_HEIGHT <= 0 and paddle2_vel < 0:
        paddle2_vel = 0
    if paddle1_pos+HALF_PAD_HEIGHT >= HEIGHT and paddle1_vel > 0:
        paddle1_vel = 0
    if paddle2_pos+HALF_PAD_HEIGHT >= HEIGHT and paddle2_vel > 0:
        paddle2_vel = 0

    # update paddle's vertical position 
    paddle1_pos += paddle1_vel
    paddle2_pos += paddle2_vel

    # draw paddles
    canvas.draw_polygon([(0,paddle1_pos-HALF_PAD_HEIGHT),(PAD_WIDTH,paddle1_pos-HALF_PAD_HEIGHT),(PAD_WIDTH,paddle1_pos+HALF_PAD_HEIGHT),(0,paddle1_pos+HALF_PAD_HEIGHT)], 5, color, color)
    canvas.draw_polygon([(WIDTH,paddle2_pos-HALF_PAD_HEIGHT),(WIDTH-PAD_WIDTH,paddle2_pos-HALF_PAD_HEIGHT),(WIDTH-PAD_WIDTH,paddle2_pos+HALF_PAD_HEIGHT),(WIDTH,paddle2_pos+HALF_PAD_HEIGHT)], 5, color, color)

    # determine whether paddle and ball collide    
    if ball_pos[1] > paddle1_pos-HALF_PAD_HEIGHT -2 and ball_pos[1]<paddle1_pos +HALF_PAD_HEIGHT +2 and ball_pos[0] - BALL_RADIUS <= PAD_WIDTH+2:
        ball_vel[0] = -ball_vel[0]
        ball_vel[1] = ball_vel[1]

    if ball_pos[1] > paddle2_pos-HALF_PAD_HEIGHT -2 and ball_pos[1] < paddle2_pos +HALF_PAD_HEIGHT+2 and WIDTH - (WIDTH - (ball_pos[0] + BALL_RADIUS)) >= (WIDTH - PAD_WIDTH) -2:
        ball_vel[0] = -ball_vel[0]
        ball_vel[1] = ball_vel[1] 

    # draw scores
    canvas.draw_text(str(score1), (WIDTH/2 - 100,80), 60, color, 'sans-serif')
    canvas.draw_text(str(score2), (WIDTH/2 + 60,80), 60, color, 'sans-serif')

def keydown(key):
    global paddle1_vel, paddle2_vel
    if key == simplegui.KEY_MAP['w']:
        paddle1_vel = -4
    elif key == simplegui.KEY_MAP['s']:
        paddle1_vel = 4
    elif key == simplegui.KEY_MAP['up']:
        paddle2_vel = -4
    elif key == simplegui.KEY_MAP['down']:
        paddle2_vel = 4
    elif key == simplegui.KEY_MAP['space']:
        start_game(random.choice([LEFT,RIGHT]))

def 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 = 0

# create frame
frame = simplegui.create_frame("Pong", WIDTH, HEIGHT)
frame.set_canvas_background('#192c36')
frame.set_draw_handler(draw)
frame.set_keydown_handler(keydown)
frame.set_keyup_handler(keyup)
frame.add_label('Start the game by pressing SPACE'),frame.add_label(' ')
frame.add_button('Restart', new_game, 100),frame.add_label(' ')
frame.add_label('Choose color theme: '),frame.add_label(' ')
frame.add_button('Red', color_red, 100)
frame.add_button('Light Blue', color_l_blue, 100)
frame.add_button('Dark Blue', color_d_blue, 100)
frame.add_button('Green', color_green, 100)
frame.add_button('Yellow', color_yellow, 100)
frame.add_button('Orange', color_orange, 100)
frame.add_button('Pink', color_pink, 100)
frame.add_button('Purple', color_purple, 100)


# start frame
open_game()
frame.start()

对于我不知道的速度，我尝试了不同的方法，none 有效，但我很确定这只是一些愚蠢的简单数学

对于颜色，颜色变量设置为从列表 color_palette 中随机选择一种颜色，但除此之外，按钮没有按预期执行。

Answer 1

# determine whether paddle and ball collide    
if ball_pos[1] > paddle1_pos-HALF_PAD_HEIGHT -2 and ball_pos[1]<paddle1_pos +HALF_PAD_HEIGHT +2 and ball_pos[0] - BALL_RADIUS <= PAD_WIDTH+2:
    ball_vel[0] = -1.1*ball_vel[0]
    ball_vel[1] = ball_vel[1] # this line does absolutely nothing ...

if ball_pos[1] > paddle2_pos-HALF_PAD_HEIGHT -2 and ball_pos[1] < paddle2_pos +HALF_PAD_HEIGHT+2 and WIDTH - (WIDTH - (ball_pos[0] + BALL_RADIUS)) >= (WIDTH - PAD_WIDTH) -2:
    ball_vel[0] = -1.1*ball_vel[0]
    ball_vel[1] = ball_vel[1]  # this line does absolutely nothing ...

你的碰撞也有点坏了......它经常击中球拍并错误地重新启动球并得分......

您需要将 global color 添加到每个颜色函数的顶部，以便分配给全局颜色而不是局部颜色...还有许多其他方法可以解决此问题...但这将需要最少的更改和工作

def color_red():
    global color
    color = color_palette[0]

使用 python 构建 'Pong'（codeskulptor）

Building 'Pong' with python (codeskulptor)

codeskulptor