Module: LensProtocol::SVG

Defined in:
lib/lens_protocol/svg.rb

Class Method Summary collapse

Class Method Details

.from_message(message, **opts) ⇒ Object 



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# File 'lib/lens_protocol/svg.rb', line 5

def from_message message, **opts
  message
    .tracing_in_rectangular_coordinates
    .select(&:any?)
    .map { |coordinates| from_rectangular_coordinates coordinates, **opts }
end

.from_rectangular_coordinates(coordinates, polygon: {}, cross: {}, cross_size: 200) ⇒ Object 



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# File 'lib/lens_protocol/svg.rb', line 12

def from_rectangular_coordinates coordinates, polygon: {}, cross: {}, cross_size: 200
  polygon_opts = {
    'stroke-width' => 50,
    'points' => polygon_points_from_coordinates(coordinates)
  }.merge(polygon)

  cross_opts = {
    'stroke-width' => 20
  }.merge(cross)

  Nokogiri::XML::Builder.new do |xml|
    xml.svg(width: '100%', viewBox: view_box_from_coordinates(coordinates), xmlns: 'http://www.w3.org/2000/svg') do |xml|
      xml.polygon polygon_opts
      xml.line cross_opts.merge(x1: 0, y1: -cross_size, x2: 0, y2: cross_size)
      xml.line cross_opts.merge(x1: -cross_size, y1: 0, x2: cross_size, y2: 0)
    end
  end.doc.root.to_s
end

.polygon_points_from_coordinates(coordinates) ⇒ Object

Parameters:

  • coordinates (Array) —

    in rectangular form (+X to the right and +Y to the top)



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# File 'lib/lens_protocol/svg.rb', line 32

def polygon_points_from_coordinates coordinates
  coordinates.map { |(x, y)| [x.round, -y.round].join(' ') }.join(', ')
end

.view_box_from_coordinates(coordinates) ⇒ Object 



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# File 'lib/lens_protocol/svg.rb', line 36

def view_box_from_coordinates coordinates
  if coordinates.any?
    # Double the max coordinates plus a 10% to leave some margin for the border
    width = coordinates.map { |(x, _)| x.abs }.max * 2.1
    height = coordinates.map { |(_, y)| y.abs }.max * 2.1
    [-width / 2, -height / 2, width, height].join ' '
  end
end