Class: Rough::Fillers::Zigzag

Inherits:
Hachure
  • Object
show all
Defined in:
lib/rough/fillers/zigzag.rb

Instance Method Summary collapse

Methods inherited from Hachure

#initialize

Constructor Details

This class inherits a constructor from Rough::Fillers::Hachure

Instance Method Details

#fill_polygons(polygon_list, o) ⇒ Object 



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# File 'lib/rough/fillers/zigzag.rb', line 10

def fill_polygons(polygon_list, o)
  gap = o.hachure_gap
  gap = o.stroke_width * 4 if gap < 0
  gap = [gap, 0.1].max
  o2 = o.merge(hachure_gap: gap)
  lines = ScanLineHachure.polygon_hachure_lines(polygon_list, o2)
  zig_zag_angle = (Math::PI / 180) * o.hachure_angle
  zigzag_lines = []
  dgx = gap * 0.5 * Math.cos(zig_zag_angle)
  dgy = gap * 0.5 * Math.sin(zig_zag_angle)
  lines.each do |line|
    p1, p2 = line
    if Geometry.line_length([p1, p2]) > 0
      zigzag_lines << [[p1[0] - dgx, p1[1] + dgy], p2.dup]
      zigzag_lines << [[p1[0] + dgx, p1[1] - dgy], p2.dup]
    end
  end
  ops = render_lines(zigzag_lines, o)
  OpSet.new(type: :fillSketch, ops: ops)
end