m93a_osm_importer.rb

# (C) 2015 by Aqualung (Jim Hamilton)
# (C) 2017 by m93a (Michal Grňo)
# Permission granted to freely use this code as long as this statement
# and the list of authors are included in any derivative work(s).
#
# m93a_osm_importer.rb
#
# Import OSM-type 2D ways
#
# version 1.1 - February 18, 2017 - Uses Sketchup's internal geo coordinates
#----------------------------------------------------------------------------------------
require 'sketchup.rb'
require 'rexml/document'
include REXML
#----------------------------------------------------------------------------------------
module M93A
  module OSM_Importer

    class << self
      def m93a_osm_import

        model = Sketchup.active_model
        imported = model.entities.add_group

        # Check for georeferencing
        unless model.georeferenced?
          UI.messagebox("The model needs to be georeferenced!")
          return
        end

        # Start the operation
        model.start_operation("Import OSM File",true)

        # Ask user for the OSM file
        base = UI.openpanel("Select OSM File", "~", "OSM Files|*.osm;||")
        path = File.dirname(base) + '/' + File.basename(base,".*") + '.osm'

        # Parse the file
        doc = Document.new File.new path
        nodes = Hash.new

        # Read positions of nodes
        doc.elements.each("osm/node") { |n|
          id = n.attributes["id"]
          lat = n.attributes["lat"].to_f
          lon = n.attributes["lon"].to_f
          # BEWARE! Longitude comes first!
          nodes[id] = model.latlong_to_point [lon,lat]
        }

        # Add ways to the model
        doc.elements.each("osm/way") { |w|
          points = []
          group = imported.entities.add_group
          w.elements.each("nd") { |n|
            points.push nodes[n.attributes["ref"]]
          }
          group.entities.add_edges points
        }

        # Commit the operation
        model.commit_operation
      end #m93a_osm_import
    end #class


    unless file_loaded?("m93a_osm_importer.rb")
      UI.menu("PlugIns").add_item("Import OSM File") { m93a_osm_import }
      file_loaded("m93a_osm_importer.rb")
    end

  end #OSM_Importer
end #M93A