gistfile1.rb

class PointShapesController < ApplicationController
  caches_page :branches

  def branches
    respond_to{ |format|

      valid_tile = Tile.valid_tile(params[:id])

      raise HTTPStatus::NotFound if valid_tile.nil?

      begin
        ico_list = Magick::ImageList.new "public/images/icons/#{params[:style]}.png"
      rescue
        raise HTTPStatus::NotFound
      end

      @ico = ico_list.first

      coord_offset_vector = Tile.pixel_vector_to_point valid_tile, @ico.columns, @ico.rows
      full_query_polygon = Tile.tile_poly_with_offset(valid_tile, coord_offset_vector)


      format.js{
        @shapes = PointShape.
        all( :conditions => ["geom && ? AND styles.name = ?", full_query_polygon, params[:style]], :include => :style ).
        sort_by{|el|-el.geom.y}
        raise HTTPStatus::NotFound if @shapes.empty?
      }

      format.png{

        a = 256

        il = Magick::ImageList.new
        il.new_image(a, a) { self.background_color = 'transparent' }

        offset = Magick::Rectangle.new(0,0,0,0)

        shapes = PointShape.all( :conditions =>
          ["geom && ? AND styles.name = ?", full_query_polygon, params[:style]], :include => :style)

        raise HTTPStatus::NotFound if shapes.empty?

        shapes.sort_by{|el|-el.geom.y}.each{|el|

          pixel_offset_vector = Tile.point_to_pixel_vector el, valid_tile

          dx = @ico.columns/2
          dy = @ico.rows

          offset.x = pixel_offset_vector.x - dx
          offset.y = pixel_offset_vector.y - dy
          new_ico = @ico.dup
          new_ico.page = offset
          il << new_ico
        }

        im = il.flatten_images
        im.format = 'png'

        send_data im.to_blob, :type => 'image/png', :disposition => 'inline'
      }
    }
  end
end