一起看看python+pygame简单画板实现代码实例

概述一起看看python+pygame简单画板实现代码实例

疑问：pygame已经过时了吗？

过没过时不知道，反正这玩意官方已经快四年没有更新了。用的人还是蛮多的（相对于其他同类项目），不过大家都是用来写写小东西玩一玩，没有人用这个做商业项目。pygame其实就是SDL的python绑定，SDL又是基于OpenGL，所以也有人用pygame+pyOpenGL做3D演示什么的。真的要写游戏的话pygame的封装比较底层，不太够用，很多东西都要自己实现（当然自由度也高）。文档也不太好，好在前人留下了很多文章。拿来练手倒是很不错的选择，可以用来实践很多2D游戏中常用的思想和算法。如果是想要直接以上来拿来写2D游戏的话还可以选择cocos2D（注意不是iOS那个，是Python的）这个的API设计的非常好，简单易用。还有场景管理、内置的控制台等等。可惜也有一年没更新……虽然作者说会更新啦，估计他主攻Objective-C那个版本的cocos了，毕竟用的人多……帧动画之类的特性没有真是很可惜（Objective-C的版本就有T_T）如果是想写引擎的话可以试试pyglet。想写3D试试panda3D或者python-orge，这俩我都没用过，不过大家都这么说，应该错不了。总的来说拿python写游戏的人少之又少，你写完了别人玩还要装环境，打包又各种BUG，拿来试验游戏中的某种算法做原型还可以。真正写还是算了。当然了，题主要是根本就没打算用pygame写游戏就当我什么都没说吧……

相关学习推荐：python视频教程

（以上来自知乎的回答，感谢！）

下面是画板截图

# -*- Coding: utf-8 -*-import pygamefrom pygame.locals import *import mathclass Brush:  def __init__(self, screen):    self.screen = screen    self.color = (0, 0, 0)    self.size = 1    self.drawing = False    self.last_pos = None    self.style = True    self.brush = pygame.image.load("images/brush.png").convert_Alpha()    self.brush_Now = self.brush.subsurface((0, 0), (1, 1))   def start_draw(self, pos):    self.drawing = True    self.last_pos = pos   def end_draw(self):    self.drawing = False   def set_brush_style(self, style):    print("* set brush style to", style)    self.style = style   def get_brush_style(self):    return self.style   def get_current_brush(self):    return self.brush_Now   def set_size(self, size):    if size < 1:      size = 1    elif size > 32:      size = 32    print("* set brush size to", size)    self.size = size    self.brush_Now = self.brush.subsurface((0, 0), (size*2, size*2))   def get_size(self):    return self.size   def set_color(self, color):    self.color = color    for i in xrange(self.brush.get_wIDth()):      for j in xrange(self.brush.get_height()):        self.brush.set_at((i, j),                 color + (self.brush.get_at((i, j)).a,))   def get_color(self):    return self.color   def draw(self, pos):    if self.drawing:      for p in self._get_points(pos):        if self.style:          self.screen.blit(self.brush_Now, p)        else:          pygame.draw.circle(self.screen, self.color, p, self.size)      self.last_pos = pos   def _get_points(self, pos):    points = [(self.last_pos[0], self.last_pos[1])]    len_x = pos[0] - self.last_pos[0]    len_y = pos[1] - self.last_pos[1]    length = math.sqrt(len_x**2 + len_y**2)    step_x = len_x / length    step_y = len_y / length    for i in xrange(int(length)):      points.append((points[-1][0] + step_x, points[-1][1] + step_y))    points = map(lambda x: (int(0.5 + x[0]), int(0.5 + x[1])), points)    return List(set(points)) class Menu:  def __init__(self, screen):    self.screen = screen    self.brush = None    self.colors = [      (0xff, 0x00, 0xff), (0x80, 0x00, 0x80),      (0x00, 0x00, 0xff), (0x00, 0x00, 0x80),      (0x00, 0xff, 0xff), (0x00, 0x80, 0x80),      (0x00, 0xff, 0x00), (0x00, 0x80, 0x00),      (0xff, 0xff, 0x00), (0x80, 0x80, 0x00),      (0xff, 0x00, 0x00), (0x80, 0x00, 0x00),      (0xc0, 0xc0, 0xc0), (0xff, 0xff, 0xff),      (0x00, 0x00, 0x00), (0x80, 0x80, 0x80),    ]    self.colors_rect = []    for (i, rgb) in enumerate(self.colors):      rect = pygame.Rect(10 + i % 2 * 32, 254 + i / 2 * 32, 32, 32)      self.colors_rect.append(rect)    self.pens = [      pygame.image.load("images/pen1.png").convert_Alpha(),      pygame.image.load("images/pen2.png").convert_Alpha(),    ]    self.pens_rect = []    for (i, img) in enumerate(self.pens):      rect = pygame.Rect(10, 10 + i * 64, 64, 64)      self.pens_rect.append(rect)    self.sizes = [      pygame.image.load("images/big.png").convert_Alpha(),      pygame.image.load("images/small.png").convert_Alpha()    ]    self.sizes_rect = []    for (i, img) in enumerate(self.sizes):      rect = pygame.Rect(10 + i * 32, 138, 32, 32)      self.sizes_rect.append(rect)   def set_brush(self, brush):    self.brush = brush   def draw(self):    for (i, img) in enumerate(self.pens):      self.screen.blit(img, self.pens_rect[i].topleft)    for (i, img) in enumerate(self.sizes):      self.screen.blit(img, self.sizes_rect[i].topleft)    self.screen.fill((255, 255, 255), (10, 180, 64, 64))    pygame.draw.rect(self.screen, (0, 0, 0), (10, 180, 64, 64), 1)    size = self.brush.get_size()    x = 10 + 32    y = 180 + 32    if self.brush.get_brush_style():      x = x - size      y = y - size      self.screen.blit(self.brush.get_current_brush(), (x, y))    else:      pygame.draw.circle(self.screen,                self.brush.get_color(), (x, y), size)    for (i, rgb) in enumerate(self.colors):      pygame.draw.rect(self.screen, rgb, self.colors_rect[i])  def click_button(self, pos):    for (i, rect) in enumerate(self.pens_rect):      if rect.collIDepoint(pos):        self.brush.set_brush_style(bool(i))        return True    for (i, rect) in enumerate(self.sizes_rect):      if rect.collIDepoint(pos):        if i:          self.brush.set_size(self.brush.get_size() - 1)        else:          self.brush.set_size(self.brush.get_size() + 1)        return True    for (i, rect) in enumerate(self.colors_rect):      if rect.collIDepoint(pos):        self.brush.set_color(self.colors[i])        return True    return Falseclass Painter:  def __init__(self):    self.screen = pygame.display.set_mode((800, 600))    pygame.display.set_caption("Painter")    self.clock = pygame.time.Clock()    self.brush = Brush(self.screen)    self.menu = Menu(self.screen)    self.menu.set_brush(self.brush)  def run(self):    self.screen.fill((255, 255, 255))    while True:      self.clock.tick(30)      for event in pygame.event.get():        if event.type == QUIT:          return        elif event.type == KEYDOWN:          if event.key == K_ESCAPE:            self.screen.fill((255, 255, 255))        elif event.type == MOUSEbuttonDOWN:          if event.pos[0] <= 74 and self.menu.click_button(event.pos):            pass          else:            self.brush.start_draw(event.pos)        elif event.type == MOUSEMOTION:          self.brush.draw(event.pos)        elif event.type == MOUSEbuttonUP:          self.brush.end_draw()      self.menu.draw()      pygame.display.update()def main():  app = Painter()  app.run() if __name__ == '__main__':  main()

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