Module: NSWTopo::Declination
- Includes:
- VectorRender
- Defined in:
- lib/nswtopo/layer/declination.rb
Constant Summary collapse
- CREATE =
%w[angle spacing arrows offset]
- DEFAULTS =
YAML.load <<~YAML spacing: 40.0 offset: 0.0 arrows: 160.0 stroke: darkred stroke-width: 0.1 symbol: path: d: M 0 0 L 0.4 2 L 0 1.3 L -0.4 2 Z stroke: none YAML
Constants included from VectorRender
VectorRender::FONT_SCALED_ATTRIBUTES, VectorRender::MARGIN, VectorRender::SVG_ATTRIBUTES
Instance Method Summary collapse
Methods included from VectorRender
#categorise, #create, #drawing_features, #features, #filename, #labeling_features, #params_for, #render
Instance Method Details
#get_features ⇒ Object
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# File 'lib/nswtopo/layer/declination.rb', line 17 def get_features @params["fill"] ||= @params["stroke"] declination = @angle || @map.declination col_spacing = @spacing row_spacing = @arrows * 0.5 col_offset = @offset % @spacing radius = 0.5 * @map.neatline.bounds.transpose.then do |bl, tr| Vector[*tr] - Vector[*bl] end.norm j_max = (radius / col_spacing).ceil i_max = (radius / row_spacing).ceil (-j_max..j_max).each.with_object(GeoJSON::Collection.new(projection: @map.neatline.projection)) do |j, collection| x = j * col_spacing + col_offset coordinates = [radius, -radius].map do |y| Vector[x, y].rotate_by_degrees(declination - @map.rotation) + Vector[*@map.dimensions] / 2 end collection.add_linestring coordinates (-i_max..i_max).reject(&j.even? ? :even? : :odd?).map do |i| Vector[x, i * row_spacing].rotate_by_degrees(declination - @map.rotation) + Vector[*@map.dimensions] / 2 end.each do |coordinates| collection.add_point coordinates, "rotation" => declination end end end |
#to_s ⇒ Object
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# File 'lib/nswtopo/layer/declination.rb', line 45 def to_s lines = features.grep(GeoJSON::LineString) return @name if lines.none? angle = lines.map(&:coordinates).map do |p0, p1| p1 - p0 end.max_by(&:norm).then do |delta| 90 + 180 * Math::atan2(delta.y, delta.x) / Math::PI + @map.rotation end "%s: %i line%s at %.1f°%s" % [@name, lines.length, (?s unless lines.one?), angle.abs, angle > 0 ? ?E : angle < 0 ? ?W : nil] end |