Pygame - creating a game background at Thursday, March 26, 2009

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Here's how the background for SubHunter is created with Pygame.

  def createBackgroundImage(self):
      '''Generate a background of sky, sea and sand'''
    
      backgroundSurface = pygame.Surface((main.GAME_WIDTH, main.GAME_HEIGHT)).convert()
    
      # Sky
      sky = pygame.Surface((main.GAME_WIDTH, main.SKY_HEIGHT)).convert()      
      for y in range(0, int(main.SKY_HEIGHT)):
          lineRect = Rect((0, y), (main.GAME_WIDTH, 1))
          greenValue = (y / main.SKY_HEIGHT) * 255          
          sky.fill((53, greenValue, 207), lineRect)              
          #sky.fill((greenValue, 0, 07), lineRect)              
      backgroundSurface.blit(sky, (0, 0))
    
      # Sea
      sea = pygame.Surface((main.GAME_WIDTH, main.SEA_HEIGHT)).convert()
      for i in range(0, int(main.SEA_HEIGHT)):
          lineRect = Rect((0, i), (main.GAME_WIDTH, 1))
          blueValue = 255 - ((i / main.SEA_HEIGHT) * 255);
          sea.fill((0, 20, blueValue), lineRect)
      backgroundSurface.blit(sea, (0, main.SKY_HEIGHT))
    
      # Sand
      sand = pygame.Surface((main.GAME_WIDTH, main.SAND_HEIGHT)).convert()      
      for i in range(0, int(main.SAND_HEIGHT)):
          lineRect = Rect((0, main.SAND_HEIGHT - i), (main.GAME_WIDTH, 1))
          colourValue = ((main.SAND_HEIGHT - i) / (main.GAME_HEIGHT - main.SAND_HEIGHT)) * 255          
          sand.fill((colourValue * 4, colourValue * 4, colourValue * 0.1), lineRect)                      
      backgroundSurface.blit(sand, (0, main.GAME_HEIGHT - main.SAND_HEIGHT))