Module: Rough::HachureFill

Defined in:
lib/rough/hachure_fill.rb

Class Method Summary collapse

Class Method Details

.hachure_lines(polygons, hachure_gap, hachure_angle, hachure_step_offset = 1) ⇒ Object 



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# File 'lib/rough/hachure_fill.rb', line 7

def hachure_lines(polygons, hachure_gap, hachure_angle, hachure_step_offset = 1)
  gap = [hachure_gap, 0.1].max
  # Detect if single polygon passed as [[x,y], ...] vs [[[x,y], ...], ...]
  polygon_list = if polygons[0] && polygons[0][0]&.is_a?(Numeric)
    [polygons]
  else
    polygons
  end

  rotation_center = [0, 0]

  if hachure_angle != 0
    polygon_list.each { |polygon| rotate_points(polygon, rotation_center, hachure_angle) }
  end

  lines = straight_hachure_lines(polygon_list, gap, hachure_step_offset)

  if hachure_angle != 0
    polygon_list.each { |polygon| rotate_points(polygon, rotation_center, -hachure_angle) }
    rotate_lines(lines, rotation_center, -hachure_angle)
  end

  lines
end