Module: NSWTopo::GPS::KML

Defined in:
lib/nswtopo/gis/gps/kml.rb

Instance Method Summary collapse

Instance Method Details

#collection ⇒ Object 



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# File 'lib/nswtopo/gis/gps/kml.rb', line 40

def collection
  GeoJSON::Collection.new.tap do |collection|
    @xml.elements.each "/kml//Placemark[Point/coordinates]" do |placemark|
      coords = placemark.elements["Point/coordinates"].text.split(',').take(2).map(&:to_f)
      collection.add_point coords, properties(placemark).merge("styles" => {})
    end
    @xml.elements.each "/kml//Placemark[LineString/coordinates]" do |placemark|
      coords = placemark.elements["LineString/coordinates"].text.split(' ').map { |triplet| triplet.split(',')[0..1].map(&:to_f) }
      collection.add_linestring coords, properties(placemark).merge("styles" => styles(placemark))
    end
    @xml.elements.each "/kml//Placemark[gx:Track]" do |placemark|
      coords = placemark.elements.collect("gx:Track/gx:coord") { |coord| coord.text.split(?\s).take(2).map(&:to_f) }
      collection.add_linestring coords, properties(placemark).merge("styles" => styles(placemark))
    end
    @xml.elements.each "/kml//Placemark[Polygon/outerBoundaryIs/LinearRing/coordinates]" do |placemark|
      coords = [placemark.elements["Polygon/outerBoundaryIs/LinearRing/coordinates"].text]
      coords += placemark.elements.collect("Polygon/innerBoundaryIs/LinearRing/coordinates", &:text)
      coords.map! do |text|
        text.split(' ').map { |triplet| triplet.split(?,).take(2).map(&:to_f) }
      end
      collection.add_polygon coords, properties(placemark).merge("styles" => styles(placemark))
    end
  end
end

#properties(placemark) ⇒ Object 



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# File 'lib/nswtopo/gis/gps/kml.rb', line 36

def properties(placemark)
  { "name" => placemark.elements["name"]&.text, "folder" => placemark.elements["ancestor::Folder/name"]&.text }
end

#styles(placemark) ⇒ Object 



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# File 'lib/nswtopo/gis/gps/kml.rb', line 4

def styles(placemark)
  style_url = placemark.elements["styleUrl"]&.text&.delete_prefix(?#)
  style_element = @xml.elements["/kml/Document/[@id='%s']" % style_url]
  result = {}

  case style_element&.name
  when "StyleMap"
    style_element = style_element.elements["Pair[key[text()='normal']]"]
    result = styles(style_element) if style_element

  when "Style"
    [%w[LineStyle stroke], %w[PolyStyle fill]].each do |element, attribute|
      /^[0-9a-fA-F]{8}$/.match(style_element.elements["#{element}/color"]&.text) do |match|
        a, b, g, r = match[0].each_char.each_slice(2).map(&:join)
        result["#{attribute}-opacity"] = (Float("0x%s" % a) / 255).round(5)
        result[attribute] = Colour.new("#%s%s%s" % [r, g, b]).to_s
      end
    end
    result["stroke"] ||= "#FFFFFF"
    result["stroke-width"] = ((style_element.elements["LineStyle/width"]&.text || 1).to_f * 25.4 / 96.0).round(5)

    [%w[fill fill], %w[outline stroke]].each do |element, attribute|
      if style_element.elements["PolyStyle/#{element}"]&.text == ?0
        result[attribute] = "none"
        result.delete "#{attribute}-opacity"
        result.delete "#{attribute}-width"
      end
    end
  end
  result
end