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([640,480])
color=(200,156,64)  
points=[] 
screen.fill([255,255,255])
pygame.draw.circle(screen,[255,0,0],[200,200],70,0)
##pygame.draw.line(screen,color,(20,20),(400,20),1)
##pygame.draw.line(screen,color,(20,20),(20,400),1)
##pygame.draw.line(screen,color,(20,400),(400,400),1)
##pygame.draw.line(screen,color,(400,400),(400,20),1)
pygame.draw.rect(screen,[255,0,0],[20,20,380,380],1)
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)>1:  
##        pygame.draw.lines(screen,color, False, points, 5)
##    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([640,480])
        screen.fill([255,255,255])   
        for i in range(100):
            forRect = []
            for j in range(4):
                    forRect.append(random.randint(0,250))
            pygame.draw.rect(screen,self.chooseColor(),forRect,2)
        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([640,480])
        screen.fill([255,255,255])
        plotPoints = []
        for x in range(0,640):
            y = int(math.sin(x/640.0 * 4 * math.pi) * 200 +240)
            plotPoints.append([x,y])
#            forRect = [x,y,2,2]
##            for j in range(4):
##                    forRect.append(random.randint(0,500))
#            pygame.draw.rect(screen,self.chooseColor(),forRect,2)
        pygame.draw.lines(screen,self.chooseColor(),False,plotPoints,1)
        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([640,480])
        screen.fill([255,255,255])
        background = pygame.image.load("C:/Users/dswu/Desktop/back.jpg")
        screen.blit(background,(0,0))
        my_image = pygame.image.load("C:/Users/dswu/Desktop/fuck16.jpg")
        screen.blit(my_image, [50,50])
        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([640,480])
        screen.fill([255,255,255])
        background = pygame.image.load("C:/Users/dswu/Desktop/back.png")
        screen.blit(background,(0,0))
        my_image = pygame.image.load("C:/Users/dswu/Desktop/player.png")
        x = 400
        y = 50
        x_speed = 5
        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(1,100):    
                pygame.time.delay(20)
                background = pygame.image.load("C:/Users/dswu/Desktop/back.png")
                screen.blit(background,(0,0))
                pygame.display.flip()
                pygame.time.delay(1)
                x = x + x_speed
                if x < 0 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……