tileset_animation.rb

  def load_tile_set(actor, action)
    actor_dir = Inflector.underscore(actor.class)
    tileset = load_image "#{actor_dir}/#{action}.png"

    action_imgs = []                                              
    w,h = *tileset.size                                           
                                                                  
    if h > w                                                      
      # down                                                      
      num_frames = h/w                                            
      clip_from = Rubygame::Rect.new(0, 0, w, w)                  
      clip_to = Rubygame::Rect.new(0, 0, w, w)                    
      num_frames.times do                                         
        surface = Rubygame::Surface.new(clip_to.size)             
        tileset.blit surface, clip_to, clip_from                  
        surface.set_colorkey(surface.get_at(0,0))                 
        action_imgs << surface                                    
        clip_from.y += w                                          
      end                                                         
    else                                                          
      # right                                                     
      num_frames = w/h                                            
      clip_from = Rubygame::Rect.new(0, 0, h, h)                  
      clip_to = Rubygame::Rect.new(0, 0, h, h)                    
      num_frames.times do                                         
        surface = Rubygame::Surface.new(clip_to.size)             
        tileset.blit surface, clip_to, clip_from                  
        surface.set_colorkey(surface.get_at(0,0))                 
        action_imgs << surface                                    
        clip_from.x += h                                          
      end                                                         
    end                                                           
                                                                  
    action_imgs                                                   
  end