Class: Graphomaton

Inherits:
Object
  • Object
show all
Defined in:
lib/graphomaton.rb,
lib/graphomaton/version.rb

Constant Summary collapse

VERSION = 
'0.1.1'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Graphomaton

Returns a new instance of Graphomaton.



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# File 'lib/graphomaton.rb', line 9

def initialize
  @states = {}
  @transitions = []
  @initial_state = nil
  @final_states = []
  @state_positions = {}
end

Instance Attribute Details

#final_states ⇒ Object

Returns the value of attribute final_states.



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# File 'lib/graphomaton.rb', line 7

def final_states
  @final_states
end

#initial_state ⇒ Object

Returns the value of attribute initial_state.



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# File 'lib/graphomaton.rb', line 7

def initial_state
  @initial_state
end

#states ⇒ Object

Returns the value of attribute states.



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# File 'lib/graphomaton.rb', line 7

def states
  @states
end

#transitions ⇒ Object

Returns the value of attribute transitions.



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# File 'lib/graphomaton.rb', line 7

def transitions
  @transitions
end

Instance Method Details

#add_final(state) ⇒ Object 



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# File 'lib/graphomaton.rb', line 30

def add_final(state)
  @final_states << state unless @final_states.include?(state)
end

#add_state(name, x = nil, y = nil) ⇒ Object 



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# File 'lib/graphomaton.rb', line 17

def add_state(name, x = nil, y = nil)
  @states[name] = { name: name, x: x, y: y }
  name
end

#add_transition(from, to, label) ⇒ Object 



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# File 'lib/graphomaton.rb', line 22

def add_transition(from, to, label)
  @transitions << { from: from, to: to, label: label }
end

#auto_layout(width = 800, height = 600) ⇒ Object 



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# File 'lib/graphomaton.rb', line 34

def auto_layout(width = 800, height = 600)
  return if @states.empty?

  ordered_states = []
  ordered_states << @initial_state if @initial_state && @states[@initial_state]

  @states.each_key do |name|
    ordered_states << name unless ordered_states.include?(name)
  end

  margin = 100
  spacing = (width - (2 * margin)) / [ordered_states.size - 1, 1].max
  y_center = height / 2

  ordered_states.each_with_index do |name, index|
    if @states[name][:x].nil? || @states[name][:y].nil?
      @states[name][:x] = margin + (index * spacing)
      @states[name][:y] = y_center
    end
  end
end

#count_parallel_transitions(from, to) ⇒ Object 



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# File 'lib/graphomaton.rb', line 56

def count_parallel_transitions(from, to)
  count = 0
  @transitions.each do |trans|
    if (trans[:from] == from && trans[:to] == to) ||
       (trans[:from] == to && trans[:to] == from)
      count += 1
    end
  end
  count
end

#get_transition_index(from, to, label) ⇒ Object 



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# File 'lib/graphomaton.rb', line 67

def get_transition_index(from, to, label)
  index = 0
  @transitions.each do |trans|
    next unless (trans[:from] == from && trans[:to] == to) ||
                (trans[:from] == to && trans[:to] == from)
    return index if trans[:from] == from && trans[:to] == to && trans[:label] == label

    index += 1
  end
  index
end

#save_svg(filename, width = 800, height = 600) ⇒ Object 



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# File 'lib/graphomaton.rb', line 297

def save_svg(filename, width = 800, height = 600)
  File.write(filename, to_svg(width, height))
end

#set_initial(state) ⇒ Object 



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# File 'lib/graphomaton.rb', line 26

def set_initial(state)
  @initial_state = state
end

#to_svg(width = 800, height = 600) ⇒ Object 



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# File 'lib/graphomaton.rb', line 79

def to_svg(width = 800, height = 600)
  auto_layout(width, height)

  doc = REXML::Document.new
  svg = doc.add_element('svg', {
                          'xmlns' => 'http://www.w3.org/2000/svg',
                          'width' => width.to_s,
                          'height' => height.to_s,
                          'viewBox' => "0 0 #{width} #{height}"
                        })

  defs = svg.add_element('defs')
  marker = defs.add_element('marker', {
                              'id' => 'arrowhead',
                              'markerWidth' => '10',
                              'markerHeight' => '10',
                              'refX' => '9',
                              'refY' => '3',
                              'orient' => 'auto'
                            })
  marker.add_element('polygon', {
                       'points' => '0 0, 10 3, 0 6',
                       'fill' => '#333'
                     })

  style = svg.add_element('style')
  style.text = <<-CSS
    .state-circle { fill: white; stroke: #333; stroke-width: 2; }
    .final-state { stroke-width: 4; }
    .state-text { font-family: Arial, sans-serif; font-size: 16px; text-anchor: middle; }
    .transition-line { stroke: #333; stroke-width: 1.5; fill: none; marker-end: url(#arrowhead); }
    .transition-label { font-family: Arial, sans-serif; font-size: 14px; fill: #666; }
    .initial-arrow { stroke: #333; stroke-width: 2; fill: none; marker-end: url(#arrowhead); }
    .label-bg { fill: white; opacity: 0.9; }
  CSS

  processed_pairs = {}

  @transitions.each_with_index do |trans, _idx|
    from_state = @states[trans[:from]]
    to_state = @states[trans[:to]]

    if from_state == to_state

      cx = from_state[:x]
      cy = from_state[:y]

      loop_height = 80
      loop_width = 45

      start_angle = -135 * Math::PI / 180
      end_angle = -45 * Math::PI / 180
      radius = 30

      start_x = cx + (radius * Math.cos(start_angle))
      start_y = cy + (radius * Math.sin(start_angle))
      end_x = cx + (radius * Math.cos(end_angle))
      end_y = cy + (radius * Math.sin(end_angle))

      control1_x = cx - loop_width
      control1_y = cy - loop_height
      control2_x = cx + loop_width
      control2_y = cy - loop_height

      path_d = "M #{start_x} #{start_y} C #{control1_x} #{control1_y}, #{control2_x} #{control2_y}, #{end_x} #{end_y}"

      svg.add_element('path', {
                        'class' => 'transition-line',
                        'd' => path_d
                      })

      svg.add_element('rect', {
                        'class' => 'label-bg',
                        'x' => (cx - 20).to_s,
                        'y' => (cy - loop_height + 5).to_s,
                        'width' => '40',
                        'height' => '20',
                        'rx' => '3'
                      })

      label = svg.add_element('text', {
                                'class' => 'transition-label',
                                'x' => cx.to_s,
                                'y' => (cy - loop_height + 20).to_s,
                                'text-anchor' => 'middle'
                              })
    else

      x1 = from_state[:x]
      y1 = from_state[:y]
      x2 = to_state[:x]
      y2 = to_state[:y]

      pair_key = [trans[:from], trans[:to]].sort.join('-')
      processed_pairs[pair_key] = 0 unless processed_pairs[pair_key]

      pair_index = processed_pairs[pair_key]
      processed_pairs[pair_key] += 1

      parallel_count = count_parallel_transitions(trans[:from], trans[:to])

      dx = x2 - x1
      dy = y2 - y1
      dist = Math.sqrt((dx**2) + (dy**2))

      radius = 30
      start_x = x1 + ((dx / dist) * radius)
      start_y = y1 + ((dy / dist) * radius)
      end_x = x2 - ((dx / dist) * radius)
      end_y = y2 - ((dy / dist) * radius)

      mid_x = (start_x + end_x) / 2
      mid_y = (start_y + end_y) / 2

      curve_offset = 0
      if parallel_count > 1

        curve_offset = if trans[:from] < trans[:to]

                         -40 * (pair_index + 1)
                       else

                         40 * (pair_index + 1)
                       end
      elsif x1 != x2

        curve_offset = -20 if x1 < x2
        curve_offset = 20 if x1 > x2
      end

      control_x = if (x2 - x1).abs < 10
                    mid_x + (50 * (pair_index.even? ? 1 : -1))
                  else
                    mid_x
                  end
      control_y = mid_y + curve_offset

      path_d = "M #{start_x} #{start_y} Q #{control_x} #{control_y}, #{end_x} #{end_y}"

      svg.add_element('path', {
                        'class' => 'transition-line',
                        'd' => path_d
                      })

      t = 0.5
      label_x = ((1 - t) * (1 - t) * start_x) + (2 * (1 - t) * t * control_x) + (t * t * end_x)
      label_y = ((1 - t) * (1 - t) * start_y) + (2 * (1 - t) * t * control_y) + (t * t * end_y)

      text_width = (trans[:label].length * 8) + 10
      svg.add_element('rect', {
                        'class' => 'label-bg',
                        'x' => (label_x - (text_width / 2)).to_s,
                        'y' => (label_y - 10).to_s,
                        'width' => text_width.to_s,
                        'height' => '20',
                        'rx' => '3'
                      })

      label = svg.add_element('text', {
                                'class' => 'transition-label',
                                'x' => label_x.to_s,
                                'y' => (label_y + 5).to_s,
                                'text-anchor' => 'middle'
                              })
    end
    label.text = trans[:label]
  end

  if @initial_state && @states[@initial_state]
    init = @states[@initial_state]
    svg.add_element('line', {
                      'class' => 'initial-arrow',
                      'x1' => (init[:x] - 60).to_s,
                      'y1' => init[:y].to_s,
                      'x2' => (init[:x] - 30).to_s,
                      'y2' => init[:y].to_s
                    })

    start_label = svg.add_element('text', {
                                    'class' => 'transition-label',
                                    'x' => (init[:x] - 70).to_s,
                                    'y' => (init[:y] - 10).to_s,
                                    'text-anchor' => 'end'
                                  })
    start_label.text = 'start'
  end

  @states.each do |name, state|
    circle_class = 'state-circle'
    circle_class += ' final-state' if @final_states.include?(name)

    svg.add_element('circle', {
                      'class' => circle_class,
                      'cx' => state[:x].to_s,
                      'cy' => state[:y].to_s,
                      'r' => '30'
                    })

    if @final_states.include?(name)
      svg.add_element('circle', {
                        'class' => 'state-circle',
                        'cx' => state[:x].to_s,
                        'cy' => state[:y].to_s,
                        'r' => '24'
                      })
    end

    text = svg.add_element('text', {
                             'class' => 'state-text',
                             'x' => state[:x].to_s,
                             'y' => (state[:y] + 5).to_s
                           })
    text.text = name.to_s
  end

  doc.to_s
end