Module: NSWTopo::Overlay

Includes:
Vector
Defined in:
lib/nswtopo/layer/overlay.rb

Constant Summary collapse

CREATE = 
%w[simplify tolerance]
TOLERANCE = 
0.4
GPX_STYLES = 
YAML.load <<~YAML
  stroke: black
  stroke-width: 0.4
YAML

Constants included from Vector

Vector::FONT_SCALED_ATTRIBUTES, Vector::MARGIN, Vector::SVG_ATTRIBUTES

Instance Method Summary collapse

Methods included from Vector

#categorise, #create, #drawing_features, #features, #filename, #labeling_features, #params_for, #render, #svg_path_data

Instance Method Details

#get_features ⇒ Object 



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# File 'lib/nswtopo/layer/overlay.rb', line 12

def get_features
  GPS.new(@path).tap do |gps|
    @simplify = true if GPS::GPX === gps
    @tolerance ||= [@map.to_mm(5), TOLERANCE].max if @simplify
  end.collection.reproject_to(@map.neatline.projection).explode.each do |feature|
    styles, folder, name = feature.values_at "styles", "folder", "name"
    styles ||= GPX_STYLES

    case feature
    when GeoJSON::LineString
      styles["stroke-linejoin"] = "round"
      if @tolerance
        simplified = feature.coordinates.douglas_peucker(@tolerance)
        smoothed = simplified.sample_at(2*@tolerance).each_cons(2).map do |segment|
          segment.along(0.5)
        end.push(simplified.last).prepend(simplified.first)
        feature.coordinates = smoothed
      end
    when GeoJSON::Polygon
      styles["stroke-linejoin"] = "miter"
    end

    categories = [folder, name].compact.reject(&:empty?).map(&method(:categorise))
    keys = styles.keys - params_for(categories.to_set).keys
    styles = styles.slice *keys

    feature.clear
    feature["category"] = categories << feature.object_id
    @params[categories.join(?\s)] = styles if styles.any?
  end
end

#to_s ⇒ Object 



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# File 'lib/nswtopo/layer/overlay.rb', line 44

def to_s
  counts = %i[linestrings polygons].map do |type|
    features.send type
  end.reject(&:empty?).map(&:length).zip(%w[line polygon]).map do |count, word|
    "%s %s%s" % [count, word, (?s if count > 1)]
  end.join(", ")
  "%s: %s" % [@name, counts]
end