Class: RailroadDiagrams::Stack

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

Instance Attribute Summary

Attributes inherited from DiagramItem

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

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) ⇒ Stack

Returns a new instance of Stack.



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

def initialize(*items)
  super('g', items)
  @need_space = false
  @width = @items.map { |item| item.width + (item.needs_space ? 20 : 0) }.max

  # pretty sure that space calc is totes wrong
  @width += AR * 2 if @items.size > 1

  @up = @items.first.up
  @down = @items.last.down
  @height = 0
  last = @items.size - 1

  @items.each_with_index do |item, i|
    @height += item.height
    @height += [AR * 2, item.up + VS].max if i.positive?
    @height += [AR * 2, item.down + VS].max if i < last
  end
end

Instance Method Details

#format(x, y, width) ⇒ Object 



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# File 'lib/railroad_diagrams/stack.rb', line 30

def format(x, y, width)
  left_gap, right_gap = determine_gaps(width, @width)
  Path.new(x, y).h(left_gap).add(self)
  x += left_gap
  x_initial = x
  if @items.size > 1
    Path.new(x, y).h(AR).add(self)
    x += AR
    inner_width = @width - (AR * 2)
  else
    inner_width = @width
  end

  @items.each_with_index do |item, i|
    item.format(x, y, inner_width).add(self)
    x += inner_width
    y += item.height
    next unless i != @items.size - 1

    Path.new(x, y)
        .arc('ne')
        .down([0, item.down + VS - (AR * 2)].max)
        .arc('es')
        .left(inner_width)
        .arc('nw')
        .down([0, @items[i + 1].up + VS - (AR * 2)].max)
        .arc('ws')
        .add(self)
    y += [item.down + VS, AR * 2].max + [@items[i + 1].up + VS, AR * 2].max
    x = x_initial + AR
  end
  if @items.size > 1
    Path.new(x, y).h(AR).add(self)
    x += AR
  end
  Path.new(x, y).h(right_gap).add(self)
  self
end

#text_diagram ⇒ Object 



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# File 'lib/railroad_diagrams/stack.rb', line 69

def text_diagram
  corner_bot_left, corner_bot_right, corner_top_left, corner_top_right, line, line_vertical = TextDiagram.get_parts(
    %w[corner_bot_left corner_bot_right corner_top_left corner_top_right line line_vertical]
  )

  # Format all the child items, so we can know the maximum width.
  item_tds = @items.map(&:text_diagram)
  max_width = item_tds.map(&:width).max
  left_lines = []
  right_lines = []
  separator_td = TextDiagram.new(0, 0, [line * max_width])
  diagram_td = nil # Top item will replace it.
  item_tds.each_with_index do |item_td, item_num|
    if item_num.zero?
      # The top item enters directly from its left.
      left_lines += [line * 2]
      left_lines += [' ' * 2] * (item_td.height - item_td.entry - 1)
    else
      # All items below the top enter from a snake-line from the previous item's exit.
      # Here, we resume that line, already having descended from above on the right.
      diagram_td = diagram_td.append_below(separator_td, [])
      left_lines += [corner_top_left + line]
      left_lines += ["#{line_vertical} "] * item_td.entry
      left_lines += [corner_bot_left + line]
      left_lines += [' ' * 2] * (item_td.height - item_td.entry - 1)
      right_lines += [' ' * 2] * item_td.exit
    end
    if item_num < item_tds.size - 1
      # All items above the bottom exit via a snake-line to the next item's entry.
      # Here, we start that line on the right.
      right_lines += [line + corner_top_right]
      right_lines += [" #{line_vertical}"] * (item_td.height - item_td.exit - 1)
      right_lines += [line + corner_bot_right]
    else
      # The bottom item exits directly to its right.
      right_lines += [line * 2]
    end
    left_pad, right_pad = TextDiagram.gaps(max_width, item_td.width)
    item_td = item_td.expand(left_pad, right_pad, 0, 0)
    diagram_td = if item_num.zero?
                   item_td
                 else
                   diagram_td.append_below(item_td, [])
                 end
  end
  left_td = TextDiagram.new(0, 0, left_lines)
  diagram_td = left_td.append_right(diagram_td, '')
  right_td = TextDiagram.new(0, right_lines.size - 1, right_lines)
  diagram_td.append_right(right_td, '')
  diagram_td
end

#to_s ⇒ Object 



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# File 'lib/railroad_diagrams/stack.rb', line 25

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