Class: RailroadDiagrams::AlternatingSequence

Inherits:
DiagramMultiContainer show all
Defined in:
lib/railroad_diagrams/alternating_sequence.rb

Instance Attribute Summary

Attributes inherited from DiagramItem

#attrs, #children, #down, #height, #needs_space, #up, #width

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from DiagramMultiContainer

#to_str, #walk

Methods inherited from DiagramItem

#add, #to_str, #walk, #write_svg

Constructor Details

#initialize(*items) ⇒ AlternatingSequence

Returns a new instance of AlternatingSequence.



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# File 'lib/railroad_diagrams/alternating_sequence.rb', line 11

def initialize(*items)
  super('g', items)
  @needs_space = false

  arc = AR
  vert = VS
  first, second = @items

  arc_x = 1 / Math.sqrt(2) * arc * 2
  arc_y = (1 - (1 / Math.sqrt(2))) * arc * 2
  cross_y = [arc, vert].max
  cross_x = (cross_y - arc_y) + arc_x

  first_out = [
    arc + arc, (cross_y / 2) + arc + arc, (cross_y / 2) + vert + first.down
  ].max
  @up = first_out + first.height + first.up

  second_in = [
    arc + arc, (cross_y / 2) + arc + arc, (cross_y / 2) + vert + second.up
  ].max
  @down = second_in + second.height + second.down

  @height = 0

  first_width = (first.needs_space ? 20 : 0) + first.width
  second_width = (second.needs_space ? 20 : 0) + second.width
  @width = (2 * arc) + [first_width, cross_x, second_width].max + (2 * arc)
end

Class Method Details

.new(*items) ⇒ Object 



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# File 'lib/railroad_diagrams/alternating_sequence.rb', line 5

def self.new(*items)
  raise "AlternatingSequence takes exactly two arguments, but got #{items.size} arguments." unless items.size == 2

  super
end

Instance Method Details

#format(x, y, width) ⇒ Object 



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# File 'lib/railroad_diagrams/alternating_sequence.rb', line 46

def format(x, y, width)
  arc = AR
  gaps = determine_gaps(width, @width)
  Path.new(x, y).right(gaps[0]).add(self)
  x += gaps[0]
  Path.new(x + @width, y + @height).right(gaps[1]).add(self)
  # bounding box
  # Path(x+gaps[0], y).up(@up).right(@width).down(@up+@down).left(@width).up(@up).add(self)
  first, second = @items

  # top
  first_in = @up - first.up
  first_out = @up - first.up - first.height
  Path.new(x, y).arc('se').up(first_in - (2 * arc)).arc('wn').add(self)
  first.format(x + (2 * arc), y - first_in, @width - (4 * arc)).add(self)
  Path.new(x + @width - (2 * arc), y - first_out)
      .arc('ne').down(first_out - (2 * arc)).arc('ws').add(self)

  # bottom
  second_in = @down - second.down - second.height
  second_out = @down - second.down
  Path.new(x, y)
      .arc('ne')
      .down(second_in - (2 * arc))
      .arc('ws')
      .add(self)
  second.format(x + (2 * arc), y + second_in, @width - (4 * arc)).add(self)
  Path.new(x + @width - (2 * arc), y + second_out)
      .arc('se').up(second_out - (2 * arc)).arc('wn').add(self)

  # crossover
  arc_x = 1 / Math.sqrt(2) * arc * 2
  arc_y = (1 - (1 / Math.sqrt(2))) * arc * 2
  cross_y = [arc, VS].max
  cross_x = (cross_y - arc_y) + arc_x
  cross_bar = (@width - (4 * arc) - cross_x) / 2

  Path.new(x + arc, y - (cross_y / 2) - arc)
      .arc('ws')
      .right(cross_bar)
      .arc_8('n', 'cw')
      .l(cross_x - arc_x, cross_y - arc_y)
      .arc_8('sw', 'ccw')
      .right(cross_bar)
      .arc('ne')
      .add(self)

  Path.new(x + arc, y + (cross_y / 2) + arc)
      .arc('wn')
      .right(cross_bar)
      .arc_8('s', 'ccw')
      .l(cross_x - arc_x, -(cross_y - arc_y))
      .arc_8('nw', 'cw')
      .right(cross_bar)
      .arc('se')
      .add(self)

  self
end

#text_diagram ⇒ Object 



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# File 'lib/railroad_diagrams/alternating_sequence.rb', line 106

def text_diagram
  cross_diag, corner_bot_left, corner_bot_right, corner_top_left, corner_top_right,
  line, line_vertical, tee_left, tee_right = TextDiagram.get_parts(
    %w[
      cross_diag roundcorner_bot_left roundcorner_bot_right
      roundcorner_top_left roundcorner_top_right line
      line_vertical tee_left tee_right
    ]
  )

  first_td = @items[0].text_diagram
  second_td = @items[1].text_diagram
  max_width = TextDiagram.max_width(first_td, second_td)
  left_width, right_width = TextDiagram.gaps(max_width, 0)

  left_lines = []
  right_lines = []
  separator = []

  left_size, right_size = TextDiagram.gaps(first_td.width, 0)
  diagram_td = first_td.expand(left_width - left_size, right_width - right_size, 0, 0)

  left_lines += [' ' * 2] * diagram_td.entry
  left_lines << (corner_top_left + line)
  left_lines += ["#{line_vertical} "] * (diagram_td.height - diagram_td.entry - 1)
  left_lines << (corner_bot_left + line)

  right_lines += [' ' * 2] * diagram_td.entry
  right_lines << (line + corner_top_right)
  right_lines += [" #{line_vertical}"] * (diagram_td.height - diagram_td.entry - 1)
  right_lines << (line + corner_bot_right)

  separator << ("#{line * (left_width - 1)}#{corner_top_right} #{corner_top_left}#{line * (right_width - 2)}")
  separator << ("#{' ' * (left_width - 1)} #{cross_diag} #{' ' * (right_width - 2)}")
  separator << ("#{line * (left_width - 1)}#{corner_bot_right} #{corner_bot_left}#{line * (right_width - 2)}")

  left_lines << (' ' * 2)
  right_lines << (' ' * 2)

  left_size, right_size = TextDiagram.gaps(second_td.width, 0)
  second_td = second_td.expand(left_width - left_size, right_width - right_size, 0, 0)
  diagram_td = diagram_td.append_below(second_td, separator, move_entry: true, move_exit: true)

  left_lines << (corner_top_left + line)
  left_lines += ["#{line_vertical} "] * second_td.entry
  left_lines << (corner_bot_left + line)

  right_lines << (line + corner_top_right)
  right_lines += [" #{line_vertical}"] * second_td.entry
  right_lines << (line + corner_bot_right)

  mid_point = first_td.height + (separator.size / 2)
  diagram_td = diagram_td.alter(new_entry: mid_point, new_exit: mid_point)

  left_td = TextDiagram.new(mid_point, mid_point, left_lines)
  right_td = TextDiagram.new(mid_point, mid_point, right_lines)

  diagram_td = left_td.append_right(diagram_td, '').append_right(right_td, '')
  TextDiagram.new(1, 1, [corner_top_left, tee_left, corner_bot_left])
             .append_right(diagram_td, '')
             .append_right(TextDiagram.new(1, 1, [corner_top_right, tee_right, corner_bot_right]), '')
end

#to_s ⇒ Object 



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# File 'lib/railroad_diagrams/alternating_sequence.rb', line 41

def to_s
  items = @items.map(&:to_s).join(', ')
  "AlternatingSequence(#{items})"
end