一起看看python+pygame簡單畫板實作程式碼實例

疑問：pygame已經過時了嗎？

過沒過時不知道，反正這玩意官方已經快四年沒有更新了。用的人還蠻多的（相對於其他同類項目），不過大家都是用來寫寫小東西玩一玩，沒有人用這個做商業項目。 pygame其實就是SDL的python綁定，SDL又是基於OpenGL，所以也有人用pygame pyOpenGL做3D示範什麼的。真的要寫遊戲的話pygame的封裝比較底層，不太夠用，很多東西都要自己實現（當然自由度也高）。文件也不太好，好在前人留下了很多文章。拿來練手倒是很不錯的選擇，可以用來實踐很多2D遊戲中常用的想法和演算法。如果是想要直接以上來拿來寫2D遊戲的話還可以選擇cocos2D（注意不是iOS那個，是Python的）這個的API設計的非常好，簡單易用。還有場景管理、內建的控制台等等。可惜也有一年沒更新……雖然作者說會更新啦，估計他主攻Objective-C那個版本的cocos了，畢竟用的人多……幀動畫之類的特性沒有真是很可惜（Objective-C的版本就有T_T）如果是想寫引擎的話可以試試看pyglet。想寫3D試試panda3D或python-orge，這倆我都沒用過，不過大家都這麼說，應該錯不了。總的來說拿python寫遊戲的人少之又少，你寫完了別人玩還要裝環境，打包又各種bug，拿來試驗遊戲中的某種演算法做原型還可以。真正寫還是算了。當然了，題主要是根本就沒打算用pygame寫遊戲就當我什麼都沒說吧…

相關學習推薦：python影片教學

（以上來自知乎的回答，感謝！）

下面是畫板截圖

# -*- coding: utf-8 -*-
import pygame
from pygame.locals import *
import math
class 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 False
class 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__ == &#39;__main__&#39;:
  main()

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