afimb/chouette2

module ProjectionFields
  extend ActiveSupport::Concern

  included do
    #attr_accessible :projection_x,:projection_y,:projection_xy

    # add projection_type set on pre-insert and pre_update action
  before_save :set_projections
  def set_projections
    if ! self.coordinates.blank?
      self.long_lat_type = 'WGS84'
    else
      self.long_lat_type = nil
    end
  end

  def projection
    if self.referential.projection_type.nil? || self.referential.projection_type.empty?
      nil
    else
      self.referential.projection_type
    end
  end
  @point = nil

  def projection_x
    if self.long_lat_type.nil? || self.projection.nil?
      nil
    else
      @point ||= GeoRuby::SimpleFeatures::Point::from_lat_lng(Geokit::LatLng.new(self.latitude,self.longitude)).project_to(self.projection.to_i)
      @point.x
    end
  end
  def projection_y
    if self.long_lat_type.nil? || self.projection.nil?
      nil
    else
      @point ||= GeoRuby::SimpleFeatures::Point::from_lat_lng(Geokit::LatLng.new(self.latitude,self.longitude)).project_to(self.projection.to_i)
      @point.y
    end
  end
  def projection_xy
    if self.long_lat_type.nil? || self.projection.nil?
      nil
    else
      @point ||= GeoRuby::SimpleFeatures::Point::from_lat_lng(Geokit::LatLng.new(self.latitude,self.longitude)).project_to(self.projection.to_i)
      @point.x.to_s+","+@point.y.to_s
    end
  end
  def projection_x=(dummy)
    # dummy method
  end
  def projection_y=(dummy)
    # dummy method
  end
  def projection_xy=(dummy)
    # dummy method
  end
  end
end