Module: Rough::Renderer

Defined in:
lib/rough/renderer.rb

Defined Under Namespace

Classes: RenderHelper

Class Method Summary collapse

Class Method Details

._offset(min, max, ops, roughness_gain = 1) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 256

def self._offset(min, max, ops, roughness_gain = 1)
  ops.roughness * roughness_gain * ((_random(ops) * (max - min)) + min)
end

._offset_opt(x, ops, roughness_gain = 1) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 260

def self._offset_opt(x, ops, roughness_gain = 1)
  _offset(-x, x, ops, roughness_gain)
end

._random(ops) ⇒ Object

Internal methods (public for RenderHelper access)



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# File 'lib/rough/renderer.rb', line 249

def self._random(ops)
  unless ops.randomizer
    ops.randomizer = Random.new(ops.seed || 0)
  end
  ops.randomizer.next
end

.arc(x, y, width, height, start, stop, closed, rough_closure, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 100

def arc(x, y, width, height, start, stop, closed, rough_closure, o)
  cx = x
  cy = y
  rx = (width / 2.0).abs
  ry = (height / 2.0).abs
  rx += _offset_opt(rx * 0.01, o)
  ry += _offset_opt(ry * 0.01, o)
  strt = start
  stp = stop
  while strt < 0
    strt += Math::PI * 2
    stp += Math::PI * 2
  end
  if (stp - strt) > (Math::PI * 2)
    strt = 0
    stp = Math::PI * 2
  end
  ellipse_inc = (Math::PI * 2) / o.curve_step_count
  arc_inc = [ellipse_inc / 2.0, (stp - strt) / 2.0].min
  ops = _arc(arc_inc, cx, cy, rx, ry, strt, stp, 1, o)
  unless o.disable_multi_stroke
    o2 = _arc(arc_inc, cx, cy, rx, ry, strt, stp, 1.5, o)
    ops.concat(o2)
  end
  if closed
    if rough_closure
      ops.concat(_double_line(cx, cy, cx + rx * Math.cos(strt), cy + ry * Math.sin(strt), o))
      ops.concat(_double_line(cx, cy, cx + rx * Math.cos(stp), cy + ry * Math.sin(stp), o))
    else
      ops << Op.new(op: :lineTo, data: [cx, cy])
      ops << Op.new(op: :lineTo, data: [cx + rx * Math.cos(strt), cy + ry * Math.sin(strt)])
    end
  end
  OpSet.new(type: :path, ops: ops)
end

.curve(input_points, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 43

def curve(input_points, o)
  if input_points.length > 0
    p1 = input_points[0]
    points_list = p1[0].is_a?(Numeric) ? [input_points] : input_points

    o1 = _curve_with_offset(points_list[0], 1 * (1 + o.roughness * 0.2), o)
    o2 = o.disable_multi_stroke ? [] : _curve_with_offset(points_list[0], 1.5 * (1 + o.roughness * 0.22), clone_options_alter_seed(o))

    (1...points_list.length).each do |i|
      pts = points_list[i]
      next unless pts.length > 0
      underlay = _curve_with_offset(pts, 1 * (1 + o.roughness * 0.2), o)
      overlay = o.disable_multi_stroke ? [] : _curve_with_offset(pts, 1.5 * (1 + o.roughness * 0.22), clone_options_alter_seed(o))
      underlay.each { |item| o1 << item if item.op != :move }
      overlay.each { |item| o2 << item if item.op != :move }
    end

    OpSet.new(type: :path, ops: o1 + o2)
  else
    OpSet.new(type: :path, ops: [])
  end
end

.double_line_fill_ops(x1, y1, x2, y2, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 220

def double_line_fill_ops(x1, y1, x2, y2, o)
  _double_line(x1, y1, x2, y2, o, true)
end

.ellipse(x, y, width, height, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 66

def ellipse(x, y, width, height, o)
  params = generate_ellipse_params(width, height, o)
  ellipse_with_params(x, y, o, params)[:opset]
end

.ellipse_with_params(x, y, o, ellipse_params) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 83

def ellipse_with_params(x, y, o, ellipse_params)
  ap1, cp1 = _compute_ellipse_points(
    ellipse_params[:increment], x, y, ellipse_params[:rx], ellipse_params[:ry],
    1, ellipse_params[:increment] * _offset(0.1, _offset(0.4, 1, o), o), o
  )
  o1 = _curve_ops(ap1, nil, o)
  if !o.disable_multi_stroke && o.roughness != 0
    ap2, _ = _compute_ellipse_points(ellipse_params[:increment], x, y, ellipse_params[:rx], ellipse_params[:ry], 1.5, 0, o)
    o2 = _curve_ops(ap2, nil, o)
    o1 += o2
  end
  {
    estimated_points: cp1,
    opset: OpSet.new(type: :path, ops: o1)
  }
end

.generate_ellipse_params(width, height, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 71

def generate_ellipse_params(width, height, o)
  psq = Math.sqrt(Math::PI * 2 * Math.sqrt(((width / 2.0)**2 + (height / 2.0)**2) / 2.0))
  step_count = [o.curve_step_count, (o.curve_step_count / Math.sqrt(200)) * psq].max.ceil
  increment = (Math::PI * 2) / step_count
  rx = (width / 2.0).abs
  ry = (height / 2.0).abs
  curve_fit_randomness = 1 - o.curve_fitting
  rx += _offset_opt(rx * curve_fit_randomness, o)
  ry += _offset_opt(ry * curve_fit_randomness, o)
  {increment: increment, rx: rx, ry: ry}
end

.helper ⇒ Object 



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# File 'lib/rough/renderer.rb', line 224

def helper
  @helper ||= RenderHelper.new
end

.line(x1, y1, x2, y2, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 12

def line(x1, y1, x2, y2, o)
  OpSet.new(type: :path, ops: _double_line(x1, y1, x2, y2, o))
end

.linear_path(points, close, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 16

def linear_path(points, close, o)
  len = (points || []).length
  if len > 2
    ops = []
    (0...(len - 1)).each do |i|
      ops.concat(_double_line(points[i][0], points[i][1], points[i + 1][0], points[i + 1][1], o))
    end
    if close
      ops.concat(_double_line(points[len - 1][0], points[len - 1][1], points[0][0], points[0][1], o))
    end
    OpSet.new(type: :path, ops: ops)
  elsif len == 2
    line(points[0][0], points[0][1], points[1][0], points[1][1], o)
  else
    OpSet.new(type: :path, ops: [])
  end
end

.pattern_fill_arc(x, y, width, height, start, stop, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 183

def pattern_fill_arc(x, y, width, height, start, stop, o)
  cx = x
  cy = y
  rx = (width / 2.0).abs
  ry = (height / 2.0).abs
  rx += _offset_opt(rx * 0.01, o)
  ry += _offset_opt(ry * 0.01, o)
  strt = start
  stp = stop
  while strt < 0
    strt += Math::PI * 2
    stp += Math::PI * 2
  end
  if (stp - strt) > (Math::PI * 2)
    strt = 0
    stp = Math::PI * 2
  end
  increment = (stp - strt) / o.curve_step_count
  points = []
  angle = strt
  while angle <= stp
    points << [cx + rx * Math.cos(angle), cy + ry * Math.sin(angle)]
    angle += increment
  end
  points << [cx + rx * Math.cos(stp), cy + ry * Math.sin(stp)]
  points << [cx, cy]
  pattern_fill_polygons([points], o)
end

.pattern_fill_polygons(polygon_list, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 178

def pattern_fill_polygons(polygon_list, o)
  require_relative "fillers/registry"
  Fillers.get(o, helper).fill_polygons(polygon_list, o)
end

.polygon(points, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 34

def polygon(points, o)
  linear_path(points, true, o)
end

.rand_offset(x, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 212

def rand_offset(x, o)
  _offset_opt(x, o)
end

.rand_offset_with_range(min, max, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 216

def rand_offset_with_range(min, max, o)
  _offset(min, max, o)
end

.rectangle(x, y, width, height, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 38

def rectangle(x, y, width, height, o)
  points = [[x, y], [x + width, y], [x + width, y + height], [x, y + height]]
  polygon(points, o)
end

.solid_fill_polygon(polygon_list, o) ⇒ Object

Fills



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# File 'lib/rough/renderer.rb', line 163

def solid_fill_polygon(polygon_list, o)
  ops = []
  polygon_list.each do |points|
    next unless points.length > 0
    offset = o.max_randomness_offset || 0
    if points.length > 2
      ops << Op.new(op: :move, data: [points[0][0] + _offset_opt(offset, o), points[0][1] + _offset_opt(offset, o)])
      (1...points.length).each do |i|
        ops << Op.new(op: :lineTo, data: [points[i][0] + _offset_opt(offset, o), points[i][1] + _offset_opt(offset, o)])
      end
    end
  end
  OpSet.new(type: :fillPath, ops: ops)
end

.svg_path(path, o) ⇒ Object 



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# File 'lib/rough/renderer.rb', line 136

def svg_path(path, o)
  segments = PathDataParser.normalize(PathDataParser.absolutize(PathDataParser.parse(path)))
  ops = []
  first = [0, 0]
  current = [0, 0]
  segments.each do |seg|
    case seg.key
    when "M"
      current = [seg.data[0], seg.data[1]]
      first = [seg.data[0], seg.data[1]]
    when "L"
      ops.concat(_double_line(current[0], current[1], seg.data[0], seg.data[1], o))
      current = [seg.data[0], seg.data[1]]
    when "C"
      x1, y1, x2, y2, x, y = seg.data
      ops.concat(_bezier_to(x1, y1, x2, y2, x, y, current, o))
      current = [x, y]
    when "Z"
      ops.concat(_double_line(current[0], current[1], first[0], first[1], o))
      current = [first[0], first[1]]
    end
  end
  OpSet.new(type: :path, ops: ops)
end