Python中的画图初体验

学到《父与子编程之旅》的16章了，跟书上的例子进行学习，学会了画圆，我又找到了画线的方法，于是就可以在screen上画日本国旗了：

手动画的不好看，也可以不手动画，直接画线：

当然也可以直接画个矩形套在外面：

代码如下：

 import pygame,sys
 from pygame.locals import *
 print pygame.ver
 pygame.init()
 screen = pygame.display.set_mode([,])
 color=(,,)
 points=[]
 screen.fill([,,])
 pygame.draw.circle(screen,[,,],[,],,)
 ##pygame.draw.line(screen,color,(,),(,),)
 ##pygame.draw.line(screen,color,(,),(,),)
 ##pygame.draw.line(screen,color,(,),(,),)
 ##pygame.draw.line(screen,color,(,),(,),)
 pygame.draw.rect(screen,[,,],[,,,],)
 pygame.display.flip()
 running = True
 while running:
     for event in pygame.event.get():
         if event.type == pygame.QUIT:
             running = False
 ##        if event.type==MOUSEBUTTONDOWN:
 ##            points.append(event.pos)
 ##    if len(points)>:
 ##        pygame.draw.lines(screen,color, False, points, )
 ##    pygame.display.update()
 pygame.quit()

下面画一个“艺术品”，100个随机颜色随机大小的矩形，这也是书上的例子，不过让我改了一种写法，熟悉一下Python：

 import pygame,sys,random
 from pygame.color import THECOLORS
 class draw:
     def drawThePic(self):
         pygame.init()
         screen = pygame.display.set_mode([,])
         screen.fill([,,])
         for i in range():
             forRect = []
             for j in range():
                     forRect.append(random.randint(,))
             pygame.draw.rect(screen,self.chooseColor(),forRect,)
         pygame.display.flip()
         running = True
         while running:
             for event in pygame.event.get():
                 if event.type == pygame.QUIT:
                     running = False
         pygame.quit()
     def chooseColor(self):
         color_name = random.choice(THECOLORS.keys())
         color = THECOLORS[color_name]
         return color
 drawer = draw()
 drawer.drawThePic()

上面这段程序需要注意一下，刚接触Python，调试中总会出现问题，比如改变列表中的变量的值的时候并不改变列表的值，还有方法定义的时候一定要在括号里加上self，还有调用的时候也要在前面加上self或者其他类的名字。

接下来，画一个正弦曲线：

以上是通过一个又一个小矩形拼成的不连续的正弦曲线，也可以画一个连续的正弦曲线，如下：

代码如下（##后面是之前画“艺术品”时的代码，#后面是不连续正弦曲线的代码）：

 import pygame,sys,random
 from pygame.color import THECOLORS
 import math
 class draw:
     def drawThePic(self):
         pygame.init()
         screen = pygame.display.set_mode([,])
         screen.fill([,,])
         plotPoints = []
         for x in range(,):
             y = int(math.sin(x/640.0 *  * math.pi) *  +)
             plotPoints.append([x,y])
 #            forRect = [x,y,,]
 ##            for j in range():
 ##                    forRect.append(random.randint(,))
 #            pygame.draw.rect(screen,self.chooseColor(),forRect,)
         pygame.draw.lines(screen,self.chooseColor(),False,plotPoints,)
         pygame.display.flip()
         running = True
         while running:
             for event in pygame.event.get():
                 if event.type == pygame.QUIT:
                     running = False
         pygame.quit()
     def chooseColor(self):
         color_name = random.choice(THECOLORS.keys())
         color = THECOLORS[color_name]
         return color
 drawer = draw()
 drawer.drawThePic()

至此，我已经学会了画线，画正弦曲线，画圆，画矩形，um……附上一个“艺术品”的图片：

接下来，我们来做些背景图片：

代码如下：

 import pygame, sys
 class ImageRun:
     def letImageRun(self):
         pygame.init()
         screen = pygame.display.set_mode([,])
         screen.fill([,,])
         background = pygame.image.load("C:/Users/dswu/Desktop/back.jpg")
         screen.blit(background,(,))
         my_image = pygame.image.load("C:/Users/dswu/Desktop/fuck16.jpg")
         screen.blit(my_image, [,])
         pygame.display.flip()
         running = True
         while running:
             for event in pygame.event.get():
                 if event.type ==pygame.QUIT:
                     running = False
         pygame.quit()
 runImage = ImageRun()
 runImage.letImageRun()

在此基础上我们就可以做个小动画了，让图片动起来：

以下代码能够让妙蛙种子左右来回运动（碰壁就反弹）：

 import pygame, sys
 class ImageRun:
     def letImageRun(self):
         pygame.init()
         screen = pygame.display.set_mode([,])
         screen.fill([,,])
         background = pygame.image.load("C:/Users/dswu/Desktop/back.png")
         screen.blit(background,(,))
         my_image = pygame.image.load("C:/Users/dswu/Desktop/player.png")
         x =
         y =
         x_speed =
         screen.blit(my_image, [x,y])
         pygame.display.flip()
         running = True
         while running:
             for event in pygame.event.get():
                 if event.type ==pygame.QUIT:
                     running = False
             #Let the image run.
             for looper in range(,):
                 pygame.time.delay()
                 background = pygame.image.load("C:/Users/dswu/Desktop/back.png")
                 screen.blit(background,(,))
                 pygame.display.flip()
                 pygame.time.delay()
                 x = x + x_speed
                 if x <  or x > screen.get_width() - my_image.get_width():
                     x_speed = - x_speed
                 screen.blit(my_image,[x,y])
                 pygame.display.flip()
         pygame.quit()
 runImage = ImageRun()
 runImage.letImageRun()

接下来……