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上一节中介绍了各种用于画图的函数，为了进一步加深印象，我们通过一个实例来把这些功能整合到一起。

#!/usr/bin/env python
import pygame
from pygame.locals import *
from sys import exit
from random import *
from math import pi

pygame.init()
screen = pygame.display.set_mode((640, 480), 0, 32)
points = []
while True:
    for event in pygame.event.get():
        if event.type == QUIT:
            exit()
        if event.type == KEYDOWN:
            # 按c键可以清屏并把点回复到原始状态
            print(event.key)
            if event.key == K_c:
                points = []
                screen.fill((255,255,255))  
        if event.type == MOUSEBUTTONDOWN:
            screen.fill((255,255,255))
            # 画随机矩形
            rc = (randint(0,255), randint(0,255), randint(0,255))
            rp = (randint(0,639), randint(0,479))
            rs = (639-randint(rp[0], 639), 479-randint(rp[1], 479))
            pygame.draw.rect(screen, rc, Rect(rp, rs))
            # 画随机圆形
            rc = (randint(0,255), randint(0,255), randint(0,255))
            rp = (randint(0,639), randint(0,479))
            rr = randint(1, 200)
            pygame.draw.circle(screen, rc, rp, rr)
            # 获得当前鼠标点击位置
            x, y = pygame.mouse.get_pos()
            points.append((x, y))
            # 根据点击位置画弧线
            angle = (x/639.)*pi*2.
            pygame.draw.arc(screen, (0,0,0), (0,0,639,479), 0, angle, 3)
            # 根据点击位置画椭圆
            pygame.draw.ellipse(screen, (0, 255, 0), (0, 0, x, y))
            # 从左上和右下画两根线连接到点击位置
            pygame.draw.line(screen, (0, 0, 255), (0, 0), (x, y))
            pygame.draw.line(screen, (255, 0, 0), (640, 480), (x, y))
            # 画点击轨迹图
            if len(points) > 1:
                pygame.draw.lines(screen, (155, 155, 0), False, points, 2)
            for p in points:
                pygame.draw.circle(screen, (155, 155, 155), p, 3)
    pygame.display.update()

运行这个程序，在上面点鼠标就会有图形出来了；按c键可以重新开始。另外这个程序只是各个命令的堆砌，主要是为了让大家能够理解和很好的使用各个函数。

下次开始我们学习游戏中的动画制作。

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