PyGame - 渲染形状

Question

我从一本名为“绝对初学者的更多Python编程”的书中编写了一款名为馅饼游戏的游戏，但形状不渲染，出现黑屏。

我希望它显示4个数字，当你按下键盘上的1,2,3和4键时，饼图/比萨/圆形面包/任何出现的切片（1弧和2行）。

我看不出代码有问题。

# The PieGame 
# 
# The last game for C02. Press keys 1, 2, 3 and 4 and the 
# pie pieces will change colour! :) 
# 
# The PieGame was programmed in PyGame 
# 
# Copyright by wait, who cares, this is just a really boring game 
# 
# ----------------------------------------------------------------- 

import pygame, sys, math, random 
from pygame.locals import * 

# +---+ SETUP +---+ 

pygame.init() 

SURFACE = pygame.display.set_mode((600, 500)) 
pygame.display.set_caption("The PieGame - Press keys 1, 2, 3, 4") 

FONT = pygame.font.Font(None, 60) 

# +---+ SETUP 2 +---+ 

BLACK = 0, 0, 0 
SILVER = 200, 200, 200 

RED = 220, 0, 0 
YELLOW = 0, 220, 220 
GREEN = 0, 220, 0 
BLUE = 0, 0, 220 
PINK = 220, 220, 0 

COLOUR = SILVER 

WIDTH = 4 
X = 300 
Y = 250 
RADIUS = 200 
POSITION = X-RADIUS, Y-RADIUS, RADIUS*2, RADIUS*2 

piece1 = False # state based programming 
piece2 = False 
piece3 = False 
piece4 = False 

# +---+ LOOP +---+ 

while True: 
    for event in pygame.event.get(): 
     if event.type == QUIT: 
      sys.exit() 
     elif event.type == KEYUP: 
      if event.key == K_ESCAPE: 
       sys.exit() 

      elif event.key == pygame.K_1: 
       piece1 = True 
      elif event.key == pygame.K_2: 
       piece1 = True 
      elif event.key == pygame.K_3: 
       piece1 = True 
      elif event.key == pygame.K_4: 
       piece1 = True 

    pygame.display.update() 

# +---+ MAIN CODE +---+ 

SURFACE.fill(BLACK) 

# draw numbers inside pie slices 
TEXT1 = FONT.render("1", True, COLOUR) 
screen.blit(TEXT1, (X+RADIUS/2-20, Y-RADIUS/2)) 

TEXT2 = FONT.render("2", True, COLOUR) 
screen.blit(TEXT2, (X+RADIUS/2, Y-RADIUS/2)) 

TEXT3 = FONT.render("3", True, COLOUR) 
screen.blit(TEXT3, (X+RADIUS/2, Y-RADIUS/2-20)) 

TEXT4 = FONT.render("1", True, COLOUR) 
screen.blit(TEXT4, (X+RADIUS/2-20, Y-RADIUS/2-20)) 

# if piece state flag is true, draw the piece 
if piece1: 
    start_angle = math.radians(0) 
    end_angle = math.radians(90) 
    pygame.draw.arc(SURFACE, COLOUR, POSITION, start_angle, end_angle, WIDTH) 
    pygame.draw.line(SURFACE, COLOUR, (X, Y), (X,Y-RADIUS), width) 
    pygame.draw.line(SURFACE, COLOUR, (X, Y), (X+RADIUS,Y), width) 

if piece2: 
    start_angle = math.radians(90) 
    end_angle = math.radians(180) 
    pygame.draw.arc(SURFACE, COLOUR, POSITION, start_angle, end_angle, WIDTH) 
    pygame.draw.line(SURFACE, COLOUR, (X, Y), (X,Y-RADIUS), width) 
    pygame.draw.line(SURFACE, COLOUR, (X, Y), (X-RADIUS,Y), width) 

if piece3: 
    start_angle = math.radians(180) 
    end_angle = math.radians(270) 
    pygame.draw.arc(SURFACE, COLOUR, POSITION, start_angle, end_angle, WIDTH) 
    pygame.draw.line(SURFACE, COLOUR, (X, Y), (X-RADIUS,Y), width) 
    pygame.draw.line(SURFACE, COLOUR, (X, Y), (X,Y+RADIUS), width) 

if piece4: 
    start_angle = math.radians(270) 
    end_angle = math.radians(360) 
    pygame.draw.arc(SURFACE, COLOUR, POSITION, start_angle, end_angle, WIDTH) 
    pygame.draw.line(SURFACE, COLOUR, (X, Y), (X,Y+RADIUS), width) 
    pygame.draw.line(SURFACE, COLOUR, (X, Y), (X+RADIUS,Y), width) 

# detect if the pie is finished 
if piece1 and piece2 and piece3 and piece4: 
    new_colour = random.randint(1,5) 
    if new_colour == 1: 
     COLOUR = RED 
    elif new_colour == 2: 
     COLOUR = YELLOW 
    elif new_colour == 3: 
     COLOUR = GREEN 
    elif new_colour == 4: 
     COLOUR = BLUE 
    elif new_colour == 5: 
     COLOUR = PURPLE 

pygame.display.update() 

Answer 1

首先，按键没有效果的原因是因为绘制弧的代码不在主循环中。它必须缩进一个制表符空间;然而，这导致了两个：

pygame.display.update() 

函数调用。您必须删除第一个，因为它应该在主循环的末尾找到。

其次，你没有一个叫表面屏幕到blit的文本上。在这里你必须使用变量SURAFCE变量。

这些编辑使程序运行，但它可能没有你想要的功能。这是一个链接到更新后的代码的工作原理：http://pastebin.com/GFfP2hX4