boards_helper.rb

module BoardsHelper
  
  def render_board( board )
    BoardPresenter.new( self, board ).render
  end
  
  def render_map( map )
    MapPresenter.new( self, map ).render
  end
  
end

map_presenter.rb

class MapPresenter
  include PresenterMethodMissing
  attr_accessor :map, :renderers
  
  def initialize( template, map, *renderers )
    self.template = template
    self.map = map
    self.renderers = renderers
  end
  
  def render( opts={} )
    current_x, current_y = 0,0
    html = render_map
    if opts.delete(:exclude_container)
      html 
    else
      content_tag( :div, :style => "height:#{map.pixel_height}px;width:#{map.pixel_width}px", :id => "board", :class => "game_board margin-top-10 left" ) do
        html
      end
    end
  end
  
  def left_offset( x )
    (x * TileFactory::TILE_WIDTH) + (TileFactory::TILE_WIDTH >> 2)
  end
  
  def top_offset( y )
    (y * TileFactory::TILE_HEIGHT) + (TileFactory::TILE_HEIGHT >> 2)
  end
  
private

  def render_map
    html = ""
    (0...map.levels.size).each do |level|
      (0...map.height).each do | current_y |
        (0...map.width).each do | current_x |
          tile = map.tile_at( current_x, current_y, level )
          html << render_tile( tile, current_x, current_y )
          renderers.each do | renderer |
            content = renderer.render( current_x, current_y, level )
            html << content if content
          end
        end
      end
    end
    html 
  end

  def render_tile( tile, x, y )
    image_tag( tile.image, :id => "tile_#{x}-#{y}", :class => "map_tile" )
  end
  
end