pygame 练习之 PIE game （以及简单图形训练）

简单的大饼游戏，掌握pygame中直线以及圆弧的画法，以及对输入的响应。

 import math
 import pygame, sys
 from pygame.locals import *
 pygame.init()
 screen = pygame.display.set_mode((600, 500))
 pygame.display.set_caption("The Pie Game -- Press 1 2 3 4")
 myfont = pygame.font.Font(None, 60)

 color = 200, 80, 60
 width = 5
 x = 300
 y = 250
 radius = 200
 position = x - radius, y - radius, radius*2,  radius*2 

 piece1 = False
 piece2 = False
 piece3 = False
 piece4 = False

 # main game loop
 while True:
     for event in pygame.event.get():
         if event.type == pygame.QUIT:
             pygame.quit()
             sys.exit()
         elif event.type == KEYUP:
             if event.key == pygame.K_ESCAPE:
                 pygame.quit()
                 sys.exit()
             elif event.key == pygame.K_1:
                 piece1 = True
             elif event.key == pygame.K_2:
                 piece2 = True
             elif event.key == pygame.K_3:
                 piece3 = True
             elif event.key == pygame.K_4:
                 piece4 = True
     #clear the screen
     screen.fill((0,0,200))

     textImg1 = myfont.render("", True, color)
     screen.blit(textImg1, (x+radius/2, y-radius/2))

     textImg2 = myfont.render("", True, color)
     screen.blit(textImg2, (x-radius/2, y-radius/2))

     textImg3 = myfont.render("", True, color)
     screen.blit(textImg3, (x-radius/2, y+radius/2))

     textImg4 = myfont.render("", True, color)
     screen.blit(textImg4, (x+radius/2, y+radius/2))

     #should the pieces be drawn?
     if piece1:
         start_angle = math.radians(0)
         end_angle   = math.radians(90)
         pygame.draw.arc(screen, color, position, start_angle, end_angle, width)
         pygame.draw.line(screen, color, (x, y), (x, y-radius), width)
         pygame.draw.line(screen, color, (x, y), (x+radius, y), width)

     if piece2:
         start_angle = math.radians(90)
         end_angle   = math.radians(180)
         pygame.draw.arc(screen, color, position, start_angle, end_angle, width)
         pygame.draw.line(screen, color, (x, y), (x, y-radius), width)
         pygame.draw.line(screen, color, (x, y), (x-radius, y), width)

     if piece3:
         start_angle = math.radians(180)
         end_angle   = math.radians(270)
         pygame.draw.arc(screen, color, position, start_angle, end_angle, width)
         pygame.draw.line(screen, color, (x, y), (x-radius, y), width)
         pygame.draw.line(screen, color, (x, y), (x, y+radius), width)

     if piece4:
         start_angle = math.radians(270)
         end_angle   = math.radians(360)
         pygame.draw.arc(screen, color, position, start_angle, end_angle, width)
         pygame.draw.line(screen, color, (x, y), (x, y+radius), width)
         pygame.draw.line(screen, color, (x, y), (x+radius, y), width)

     #finished?
     if piece1 and piece2 and piece3 and piece4:
         color = 0, 255, 0

     pygame.display.update()

效果图：

绘制椭圆：