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

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

    textImg3 = myfont.render("3", True, color)
    screen.blit(textImg3, (x-radius/2, y+radius/2))

    textImg4 = myfont.render("4", 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：