Class: RSyntaxTree::SVGGraph

Inherits:
BaseGraph show all
Defined in:
lib/rsyntaxtree/svg_graph.rb

Constant Summary collapse

REGION_DEFAULT_COLOR =

Default color for a region shade drawn with bare '%' (no color spec). An explicit '%@color:' is always honored, even in color-off mode, to stay consistent with how the @color: node-text color behaves.

"#888888"
REGION_FILL_OPACITY =

Fill opacity for region shades; low enough that nested/overlapping shades stack naturally without obscuring the tree underneath.

0.2
REGION_STROKE_OPACITY =

The border reuses the fill color but at a higher opacity, so it reads as a darker shade of the same color — keeping the region clearly bounded on a white page without a per-color "darker shade" lookup.

0.55

Constants inherited from BaseGraph

BaseGraph::LINK_ARROW_CLEARANCE, BaseGraph::TIDY_BASE_SPACING, BaseGraph::TIDY_CONVERGENCE, BaseGraph::TIDY_EXTRA_CAP, BaseGraph::TIDY_HEIGHT_BUDGET, BaseGraph::TIDY_LEVEL_BALANCE, BaseGraph::TIDY_MAX_ITERATIONS

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from BaseGraph

#ancestor_ids, #calculate_height, #calculate_indent, #calculate_level, #calculate_width, #child_spread, #connector_height_for, #contour_clearance, #draw_connector, #draw_elements, #effective_rect, #finalize_ltr, #get_leftmost, #get_rightmost, #layout_overlaps?, #layout_snapshot, #level_connector_heights, #link_connection_pairs, #make_balance, #middle_child_alignment, #mirror_layout, #node_centering, #normalize_horizontal, #parse_list, #prepare_ltr, #restore_layout, #restore_middle_child_alignment, #shift_subtree, #spread_linked_pairs, #subtree_leaf_center_span, #subtree_leaf_span, #subtree_rects, #tidy_compress, #tidy_gap

Constructor Details

#initialize(element_list, params, global) ⇒ SVGGraph

Returns a new instance of SVGGraph.



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# File 'lib/rsyntaxtree/svg_graph.rb', line 30

def initialize(element_list, params, global)
  super(element_list, params, global)
  @height = 0
  @width  = 0
  @extra_lines = []
  @region_shades = []
  @fontset = params[:fontset]
  @fontsize = params[:fontsize]
  @linewidth = params[:linewidth]
  @transparent = params[:transparent] == true
  @color = params[:color]
  @fontstyle = params[:fontstyle]
  @polyline = params[:polyline] == true
  @direction = params[:direction] || "ttb"
  @line_styles = "<line style='fill: none; stroke:#{@col_line}; stroke-width:#{@linewidth + LINE_SCALING}; stroke-linejoin:round; stroke-linecap:round;' x1='X1' y1='Y1' x2='X2' y2='Y2' />\n"
  @polyline_styles = "<polyline style='stroke:#{@col_line}; stroke-width:#{@linewidth + LINE_SCALING}; fill:none; stroke-linejoin:round; stroke-linecap:round;'
                        points='CHIX CHIY MIDX1 MIDY1 MIDX2 MIDY2 PARX PARY' />\n"
  @polygon_styles = "<polygon style='fill: none; stroke: #{@col_connector}; stroke-width:#{@linewidth + LINE_SCALING}; stroke-linejoin:round;stroke-linecap:round;' points='X1 Y1 X2 Y2 X3 Y3' />\n"
  @text_styles = "<text white-space='pre' alignment-baseline='text-top' style='fill: COLOR; storoke-width: 0; font-size: fontsize' x='X_VALUE' y='Y_VALUE'>CONTENT</text>\n"
  @tree_data = String.new
  @visited_x = {}
  @visited_y = {}
  @global = global
end

Instance Attribute Details

#height ⇒ Object

Returns the value of attribute height.



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# File 'lib/rsyntaxtree/svg_graph.rb', line 28

def height
  @height
end

#width ⇒ Object

Returns the value of attribute width.



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# File 'lib/rsyntaxtree/svg_graph.rb', line 28

def width
  @width
end

Instance Method Details

#bothways_arrows(x1, y1, x2, y2, col, swidth) ⇒ Object

Two arrowheads back to back at the midpoint of a link, drawn as filled triangles sized to the link itself. The arrowBothways marker this replaces was one fixed size — three inter-node gaps wide — so on a short link between narrow-spaced boxes it spilled over both of them.



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# File 'lib/rsyntaxtree/svg_graph.rb', line 824

def bothways_arrows(x1, y1, x2, y2, col, swidth)
  len = Math.hypot(x2 - x1, y2 - y1)
  return "" if len.zero?

  ux = (x2 - x1) / len
  uy = (y2 - y1) / len
  mx = (x1 + x2) / 2
  my = (y1 + y2) / 2

  # Same proportions the marker had — three inter-node gaps end to end,
  # one deep, two heads with a shaft's worth of daylight between them —
  # so a link long enough to hold it looks as it always did. What is new
  # is that a shorter link gets the same shape at a smaller size instead
  # of the one fixed size spilling over the boxes on either side.
  span = [@global[:h_gap_between_nodes] * 3, len * 0.8].min
  head = span / 3.0
  half = head / 2.0

  arrow = lambda do |dir|
    tip_x = mx + ux * (span / 2.0) * dir
    tip_y = my + uy * (span / 2.0) * dir
    base_x = mx + ux * half * dir
    base_y = my + uy * half * dir
    "<polygon points='#{tip_x},#{tip_y} " \
      "#{base_x - uy * half},#{base_y + ux * half} " \
      "#{base_x + uy * half},#{base_y - ux * half}' " \
      "style='fill:#{col}; stroke:none;' />"
  end

  arrow.call(1) + "\n" + arrow.call(-1)
end

#collect_region_shades ⇒ Object

Collect a background rectangle for every element flagged with '%'. Outer (shallower) regions are emitted first so deeper ones layer on top; with low opacity the overlap reads as a darker nesting.



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# File 'lib/rsyntaxtree/svg_graph.rb', line 147

def collect_region_shades
  hctt = @global[:height_connector_to_text]
  pad = @global[:h_gap_between_nodes]  # generous padding for the non-parent-facing edges
  pad_parent = hctt / 2.0              # tighter margin on the parent-facing edge of the root
  radius = hctt / 2.0
  stroke_width = @linewidth + LINE_SCALING
  half = stroke_width / 2.0
  @element_list.get_elements.each do |element|
    next unless element.region

    b = region_subtree_bounds(element.id)
    left = b[:left] - pad
    right = b[:right] + pad
    top = b[:top] - pad
    bottom = b[:bottom] + pad

    # The edge facing the parent is handled specially so the incoming
    # connector neither overlaps nor touches the plane. That edge is the
    # TOP in top-to-bottom layout and the LEFT in left-to-right layout; the
    # other edges keep the generous padding. For a non-root node the edge
    # is placed midway between the connector anchor and the content edge
    # (even gap on both sides); the tree root has no incoming connector, so
    # it just gets a tighter-but-consistent margin there.
    is_root = element.parent.zero?
    if @direction == "ltr"
      anchor = element.horizontal_indent - hctt
      left = if is_root
               b[:left] - pad_parent
             elsif anchor < b[:left]
               (b[:left] + anchor) / 2.0
             else
               left
             end
    else
      anchor = element.vertical_indent + hctt / 2.0
      top = if is_root
              b[:top] - pad_parent
            elsif anchor < b[:top]
              (b[:top] + anchor) / 2.0
            else
              top
            end
    end

    x = left
    y = top
    w = right - left
    h = bottom - top
    # An explicit shade color is always honored (consistent with the
    # @color: node-text color); bare '%' falls back to gray.
    color = element.region_color || REGION_DEFAULT_COLOR
    @region_shades << "<rect x='#{x}' y='#{y}' width='#{w}' height='#{h}' rx='#{radius}' ry='#{radius}' " \
                      "fill='#{color}' fill-opacity='#{REGION_FILL_OPACITY}' " \
                      "stroke='#{color}' stroke-opacity='#{REGION_STROKE_OPACITY}' stroke-width='#{stroke_width}' />\n"

    # Track the union of region extents (the stroke straddles the edge, so
    # it reaches half a stroke-width outside the rect) for canvas growth.
    rb = (@region_bounds ||= { min_x: x - half, min_y: y - half, max_x: x + w + half, max_y: y + h + half })
    rb[:min_x] = x - half if x - half < rb[:min_x]
    rb[:min_y] = y - half if y - half < rb[:min_y]
    rb[:max_x] = x + w + half if x + w + half > rb[:max_x]
    rb[:max_y] = y + h + half if y + h + half > rb[:max_y]
  end
end

#draw_a_path(s_x, s_y, t_x, t_y, target_arrow = :none) ⇒ Object 



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# File 'lib/rsyntaxtree/svg_graph.rb', line 257

def draw_a_path(s_x, s_y, t_x, t_y, target_arrow = :none)
  spacing = @global[:h_gap_between_nodes] * 1.25
  min_bulge = @global[:height_connector_to_text]

  # Centered offset for multiple lines at the same endpoint
  s_key = "#{s_x.round}"
  t_key = "#{t_x.round}"
  @visited_x[s_key] = (@visited_x[s_key] || 0) + 1
  @visited_x[t_key] = (@visited_x[t_key] || 0) + 1
  s_offset = ((@visited_x[s_key] - 1) - (@visited_x[s_key] - 1) / 2.0) * spacing
  t_offset = ((@visited_x[t_key] - 1) - (@visited_x[t_key] - 1) / 2.0) * spacing

  dashed = true if target_arrow == :none

  if @direction == "ltr"
    # LTR: route to the RIGHT of the tree (⊃ shape / reversed C)
    # Source → right → vertical → left → Target
    xmax = [s_x, t_x].max
    bulge = [min_bulge, (s_y - t_y).abs * 0.3 + min_bulge].min
    # Ensure paths don't overlap: extend beyond previous paths
    new_x = if xmax < @width
              @width + bulge
            else
              xmax + bulge
            end

    new_s_y = s_y + s_offset
    new_t_y = t_y + t_offset

    case target_arrow
    when :single
      @extra_lines << generate_line(s_x, new_s_y, new_x, new_s_y, @col_path, dashed)
      @extra_lines << generate_line(new_x, new_s_y, new_x, new_t_y, @col_path, dashed)
      @extra_lines << generate_line(new_x, new_t_y, t_x, new_t_y, @col_path, dashed, true)
    when :double
      @extra_lines << generate_line(new_x, new_s_y, s_x, new_s_y, @col_path, dashed, true)
      @extra_lines << generate_line(new_x, new_s_y, new_x, new_t_y, @col_path, dashed)
      @extra_lines << generate_line(new_x, new_t_y, t_x, new_t_y, @col_path, dashed, true)
    else
      @extra_lines << generate_line(s_x, new_s_y, new_x, new_s_y, @col_path, dashed)
      @extra_lines << generate_line(new_x, new_s_y, new_x, new_t_y, @col_path, dashed)
      @extra_lines << generate_line(new_x, new_t_y, t_x, new_t_y, @col_path, dashed)
    end
    @width = new_x if new_x > @width
  else
    # TTB: route BELOW the tree (U shape)
    # Source → down → horizontal → up → Target
    ymax = [s_y, t_y].max
    # Proportional bulge: based on distance between endpoints,
    # not the full tree height
    bulge = [min_bulge, (s_x - t_x).abs * 0.3 + min_bulge].min
    new_y = ymax + bulge

    new_s_x = s_x - s_offset
    new_t_x = t_x - t_offset

    case target_arrow
    when :single
      @extra_lines << generate_line(new_s_x, s_y, new_s_x, new_y, @col_path, dashed)
      @extra_lines << generate_line(new_s_x, new_y, new_t_x, new_y, @col_path, dashed)
      @extra_lines << generate_line(new_t_x, new_y, new_t_x, t_y, @col_path, dashed, true)
    when :double
      @extra_lines << generate_line(new_s_x, new_y, new_s_x, s_y, @col_path, dashed, true)
      @extra_lines << generate_line(new_s_x, new_y, new_t_x, new_y, @col_path, dashed)
      @extra_lines << generate_line(new_t_x, new_y, new_t_x, t_y, @col_path, dashed, true)
    else
      @extra_lines << generate_line(new_s_x, s_y, new_s_x, new_y, @col_path, dashed)
      @extra_lines << generate_line(new_s_x, new_y, new_t_x, new_y, @col_path, dashed)
      @extra_lines << generate_line(new_t_x, new_y, new_t_x, t_y, @col_path, dashed)
    end
    @height = new_y if new_y > @height
  end
end

#draw_bracket(x1, y1, width, height, col, bline = false) ⇒ Object 



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# File 'lib/rsyntaxtree/svg_graph.rb', line 595

def draw_bracket(x1, y1, width, height, col, bline = false)
  swidth = bline ? @linewidth + BLINE_SCALING : @linewidth + LINE_SCALING
  slwidth = @global[:h_gap_between_nodes] / 2
  @extra_lines << "<polyline style='stroke:#{col}; stroke-width:#{swidth}; fill:none; stroke-linejoin:round; stroke-linecap:round;'
                        points='#{x1 + slwidth},#{y1} #{x1},#{y1} #{x1},#{y1 + height} #{x1 + slwidth},#{y1 + height}' />\n"
  @extra_lines << "<polyline style='stroke:#{col}; stroke-width:#{swidth}; fill:none; stroke-linejoin:round; stroke-linecap:round;'
                        points='#{x1 + width - slwidth},#{y1} #{x1 + width},#{y1} #{x1 + width},#{y1 + height} #{x1 + width - slwidth},#{y1 + height}' />\n"
end

#draw_element(element) ⇒ Object 



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# File 'lib/rsyntaxtree/svg_graph.rb', line 331

def draw_element(element)
  top = element.vertical_indent
  left = element.horizontal_indent
  right = left + element.content_width
  txt_pos = left + (right - left) / 2

  # Use element's custom color if specified, otherwise use default based on type
  col = if element.color
          element.color
        elsif element.type == ETYPE_LEAF
          @col_leaf
        else
          @col_node
        end

  text_data = @text_styles.sub(/COLOR/, col)
  text_data = text_data.sub(/fontsize/, @fontsize.to_s + "px;")
  # The node is laid out at the width of its label plus the room its own
  # enclosure needs, so the text starts that far inside the node's left
  # edge and the enclosure is drawn on the edge itself.
  enclosure_room = element.label_enclosure_room
  text_x = txt_pos - element.content_width / 2 + enclosure_room
  text_y = top + @global[:single_line_height] - @global[:height_connector_to_text]
  text_data  = text_data.sub(/X_VALUE/, text_x.to_s)
  text_data  = text_data.sub(/Y_VALUE/, text_y.to_s)
  new_text = +""
  this_x = 0
  this_y = 0
  prev_line_height = nil
  bc = { x: text_x - enclosure_room, y: top, width: element.content_width, height: nil }
  element.content.each_with_index do |l, idx|
    case l[:type]
    when :border, :bborder
      x1 = text_x
      if idx.zero?
        text_y -= l[:height]
      else
        text_y += l[:height]
      end
      y1 = text_y - @global[:single_line_height] / 8
      x2 = text_x + element.text_width
      y2 = y1
      case l[:type]
      when :border
        stroke_width = @linewidth + LINE_SCALING
      when :bborder
        stroke_width = @linewidth + BLINE_SCALING
      end
      @extra_lines << "<line style=\"stroke:#{col}; fill:none; stroke-linecap:round; stroke-width:#{stroke_width}; \" x1=\"#{x1}\" y1=\"#{y1}\" x2=\"#{x2}\" y2=\"#{y2}\"></line>"
    else
      if @direction == "ltr" && element.type == ETYPE_LEAF
        # LTR leaves: left-align text at the node's left edge
        this_x = left
      elsif element.enclosure == :brackets
        this_x = text_x
      else
        ewidth = 0
        l[:elements].each do |e|
          ewidth += e[:width]
        end
        this_x = txt_pos - (ewidth / 2)
      end
      # Advance by the height of the line just drawn, not of this one: a
      # row holding a nested matrix is as tall as the matrix, and the row
      # after it has to clear all of it.
      text_y += prev_line_height if idx != 0 && prev_line_height
      text_y += l[:top_room].to_f
      prev_line_height = l[:elements].map { |e| e[:height] }.max

      l[:elements].each do |e|
        if e[:decoration].include?(:matrix)
          markup, this_x = render_matrix(e, this_x, text_y, element, col)
          new_text << markup
          next
        end

        markup, this_x = render_run(e, this_x, text_y, element, col)
        new_text << markup
      end
    end
    @height = text_y if text_y > @height
  end

  bc[:y] = bc[:y] + @global[:height_connector_to_text] * 3 / 4
  # text_y is the baseline of the last line. A line holding a nested matrix
  # reaches further down than a line of text, so the label has to be given
  # the rest of it.
  overhang = prev_line_height.to_f - @global[:single_x_metrics].height
  bc[:height] = text_y - bc[:y] + @global[:height_connector_to_text] + [overhang, 0].max
  case element.enclosure
  when :brackets
    draw_bracket(bc[:x], bc[:y], bc[:width], bc[:height], col)
  when :rectangle
    draw_rectangle(bc[:x], bc[:y], bc[:width], bc[:height], col)
  when :brectangle
    draw_rectangle(bc[:x], bc[:y], bc[:width], bc[:height], col, true)
  end

  element.content_height = bc[:height]
  @tree_data += text_data.sub(/CONTENT/, new_text)
end

#draw_paths ⇒ Object 



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# File 'lib/rsyntaxtree/svg_graph.rb', line 612

def draw_paths
  paths = []
  path_pool_target = {}
  path_pool_other = {}
  path_pool_source = {}
  path_flags = []

  line_pool = {}
  line_flags = []

  elist = @element_list.get_elements

  elist.each do |element|
    if @direction == "ltr"
      # LTR anchors: paths attach at left/right edges, vertically centered
      hctt = @global[:height_connector_to_text]
      y_center = element.vertical_indent + (element.content_height + hctt * 1.5) / 2
      x0 = element.horizontal_indent - hctt
      x1 = element.horizontal_indent + element.content_width + hctt
      x2 = element.horizontal_indent + element.content_width + hctt * 2
      y0 = y_center
      y1 = y_center
      # A line-type connection, though, wants the box's own geometry.
      # The path anchors sit a clearance off the box — right for a curve
      # leaving a node, but a straight link anchored there floats off
      # both boxes, or lands inside them when the gap is narrow.
      lgeom = {
        left: element.horizontal_indent,
        right: element.horizontal_indent + element.content_width,
        top: y_center - element.content_height / 2,
        bottom: y_center + element.content_height / 2,
        cx: element.horizontal_indent + element.content_width / 2,
        cy: y_center
      }
    else
      # x0/x2 are the box's own edges: a link between two nodes runs
      # between these plus a small margin. Anchoring a full h_gap
      # outside the box left links too short in wide gaps and pushed
      # them into the boxes in narrow ones. Only the line pool uses
      # x0/x2; movement paths read x1, which is unchanged.
      x0 = element.horizontal_indent
      x1 = element.horizontal_indent + element.content_width / 2
      x2 = element.horizontal_indent + element.content_width
      y0 = element.vertical_indent + @global[:height_connector_to_text] / 2
      y1 = element.vertical_indent + element.content_height + @global[:height_connector_to_text]
      lgeom = nil
    end
    et = element.path
    et.each do |tr|
      if /\A-(>|<)?(\d+)\z/ =~ tr
        arrow = $1
        tr = $2
        if line_pool[tr]
          line_pool[tr] << { x: { left: x0, center: x1, right: x2 }, y: { top: y0, center: y0 + (y1 - y0) / 2, bottom: y1 }, arrow: arrow, geom: lgeom }
        else
          line_pool[tr] = [{ x: { left: x0, center: x1, right: x2 }, y: { top: y0, center: y0 + (y1 - y0) / 2, bottom: y1 }, arrow: arrow, geom: lgeom }]
        end
        line_flags << tr
      elsif /\A(?:>|<)(\d+)\z/ =~ tr
        tr = $1
        if path_pool_target[tr]
          path_pool_target[tr] << [x1, y1]
        else
          path_pool_target[tr] = [[x1, y1]]
        end
        path_flags << tr
      elsif path_pool_source[tr]
        if path_pool_other[tr]
          path_pool_other[tr] << [x1, y1]
        else
          path_pool_other[tr] = [[x1, y1]]
        end
        path_flags << tr
      else
        path_pool_source[tr] = [x1, y1]
        path_flags << tr
      end
      raise RSTError, +"Error: input text contains a path having more than two ends:\n > #{tr}" if path_flags.tally.any? { |_k, v| v > 2 } || line_flags.tally.any? { |_k, v| v > 2 }
    end
  end

  path_flags.tally.each do |k, v|
    raise RSTError, +"Error: input text contains a path having only one end:\n > #{k}" if v == 1
  end

  # A line-type connection is subject to the same rule as a path: it takes
  # two ends. Without this the drawing walked off a nil pool below.
  line_flags.tally.each do |k, v|
    raise RSTError, +"Error: input text contains a line having only one end:\n > #{k}" if v == 1
  end

  path_pool_source.each do |k, v|
    path_flags.delete(k)
    if (targets = path_pool_target[k])
      targets.each do |t|
        paths << { x1: v[0], y1: v[1], x2: t[0], y2: t[1], arrow: :single }
      end
    elsif (others = path_pool_other[k])
      others.each do |t|
        paths << { x1: v[0], y1: v[1], x2: t[0], y2: t[1], arrow: :none }
      end
    end
  end

  path_flags.uniq.each do |k|
    targets = path_pool_target[k]
    next if targets.nil? || targets.empty?

    fst = targets.shift
    next if fst.nil?

    targets.each do |t|
      paths << { x1: fst[0], y1: fst[1], x2: t[0], y2: t[1], arrow: :double }
    end
  end

  paths.each do |t|
    draw_a_path(t[:x1], t[:y1], t[:x2], t[:y2], t[:arrow])
  end

  line_pool.each do |_k, v|
    a = v[0]
    b = v[1]

    # A straight link stops a small margin short of each box. The margin
    # scales with the inter-node gap and is clamped so an endpoint can
    # never cross the facing edge.
    margin = @global[:h_gap_between_nodes] * 0.25
    inset = ->(gap) { [[margin, gap / 2 - 1].min, 0].max }

    if @direction == "ltr"
      # LTR: use x-position to determine depth relationship,
      # y-position for sibling relationship
      ga = a[:geom]
      gb = b[:geom]
      if ga[:left] > gb[:right]
        m = inset.call(ga[:left] - gb[:right])
        generate_connectors(ga[:left] - m, ga[:cy], gb[:right] + m, gb[:cy], @col_extra, false, a[:arrow], b[:arrow])
      elsif ga[:right] < gb[:left]
        m = inset.call(gb[:left] - ga[:right])
        generate_connectors(gb[:left] - m, gb[:cy], ga[:right] + m, ga[:cy], @col_extra, false, b[:arrow], a[:arrow])
      elsif ga[:cy] < gb[:cy]
        m = inset.call(gb[:top] - ga[:bottom])
        generate_connectors(ga[:cx], ga[:bottom] + m, ga[:cx], gb[:top] - m, @col_extra, false, a[:arrow], b[:arrow])
      else
        m = inset.call(ga[:top] - gb[:bottom])
        generate_connectors(gb[:cx], gb[:bottom] + m, gb[:cx], ga[:top] - m, @col_extra, false, b[:arrow], a[:arrow])
      end
    else
      # TTB: use y-position to determine depth relationship
      if a[:y][:top] > b[:y][:bottom]
        generate_connectors(a[:x][:center], a[:y][:top], b[:x][:center], b[:y][:bottom], @col_extra, false, a[:arrow], b[:arrow])
      elsif a[:y][:bottom] < b[:y][:top]
        generate_connectors(b[:x][:center], b[:y][:top], a[:x][:center], a[:y][:bottom], @col_extra, false, b[:arrow], a[:arrow])
      elsif a[:x][:center] < b[:x][:center]
        m = inset.call(b[:x][:left] - a[:x][:right])
        if a[:y][:top] == b[:y][:top]
          upper_y = a[:y][:center] < b[:y][:center] ? a[:y][:center] : b[:y][:center]
          generate_connectors(a[:x][:right] + m, upper_y, b[:x][:left] - m, upper_y, @col_extra, false, a[:arrow], b[:arrow])
        else
          generate_connectors(a[:x][:right] + m, a[:y][:center], b[:x][:left] - m, b[:y][:center], @col_extra, false, a[:arrow], b[:arrow])
        end
      elsif a[:y][:top] == b[:y][:top]
        upper_y = a[:y][:center] < b[:y][:center] ? a[:y][:center] : b[:y][:center]
        m = inset.call(a[:x][:left] - b[:x][:right])
        generate_connectors(b[:x][:right] + m, upper_y, a[:x][:left] - m, upper_y, @col_extra, false, b[:arrow], a[:arrow])
      else
        m = inset.call(a[:x][:left] - b[:x][:right])
        generate_connectors(b[:x][:right] + m, b[:y][:center], a[:x][:left] - m, a[:y][:center], @col_extra, false, b[:arrow], a[:arrow])
      end
    end
  end
  paths.size + line_pool.keys.size
end

#draw_rectangle(x1, y1, width, height, col, bline = false) ⇒ Object 



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# File 'lib/rsyntaxtree/svg_graph.rb', line 589

def draw_rectangle(x1, y1, width, height, col, bline = false)
  swidth = bline ? @linewidth + BLINE_SCALING : @linewidth + LINE_SCALING
  @extra_lines << "<polygon style='stroke:#{col}; stroke-width:#{swidth}; fill:none; stroke-linejoin:round; stroke-linecap:round;'
                        points='#{x1},#{y1} #{x1 + width},#{y1} #{x1 + width},#{y1 + height} #{x1},#{y1 + height}' />\n"
end

#element_visual_box(el) ⇒ Object

Visual bounding box of a single element as actually drawn: the label / enclosure box (which starts hctt*3/4 below vertical_indent, i.e. below the connector gap) widened to include any enclosure bracket/rectangle that is painted beyond the content width.



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# File 'lib/rsyntaxtree/svg_graph.rb', line 216

def element_visual_box(el)
  hctt = @global[:height_connector_to_text]
  box_top = el.vertical_indent + hctt * 3 / 4 # bc[:y]: line-height / enclosure box top
  box_bottom = box_top + el.content_height
  left = el.horizontal_indent
  right = el.horizontal_indent + el.content_width
  if [:brackets, :rectangle, :brectangle].include?(el.enclosure)
    # The room the enclosure needs is already part of content_width; only
    # the stroke straddling the edge reaches beyond it.
    ext = @linewidth + BLINE_SCALING
    left -= ext
    right += ext
    sw = @linewidth + BLINE_SCALING
    top = box_top - sw
    bottom = box_bottom + sw
  else
    # No enclosure box is painted, so hug the actual glyphs rather than the
    # taller line-height box: the line box carries ~hctt*3/4 of leading both
    # above the cap top and below the baseline, which would otherwise leave
    # too much empty space above and below a plain label.
    top = el.vertical_indent + hctt * 3 / 2
    bottom = box_bottom - hctt * 3 / 4
  end
  { left: left, top: top, right: right, bottom: bottom }
end

#generate_connectors(x1, y1, x2, y2, col, dashed = false, s_arrow = false, t_arrow = false, bline = false) ⇒ Object 



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# File 'lib/rsyntaxtree/svg_graph.rb', line 787

def generate_connectors(x1, y1, x2, y2, col, dashed = false, s_arrow = false, t_arrow = false, bline = false)
  string = if s_arrow && t_arrow
             "" # bothways arrowheads are drawn as chevrons below
           elsif s_arrow
             "marker-mid='url(#arrowForward)' "
           elsif t_arrow
             "marker-mid='url(#arrowBackward)' "
           else
             ""
           end
  dasharray = dashed ? "stroke-dasharray='8 8'" : ""
  swidth = bline ? @linewidth + BLINE_SCALING : @linewidth + LINE_SCALING

  if s_arrow && t_arrow
    @extra_lines << "<line x1='#{x1}' y1='#{y1}' x2='#{x2}' y2='#{y2}' style='fill: none; stroke: #{col}; stroke-width:#{swidth}; stroke-linecap:round;' #{dasharray}/>"
    @extra_lines << bothways_arrows(x1, y1, x2, y2, col, swidth)
  elsif s_arrow || t_arrow
    x_mid = if x2 > x1
              x1 + (x2 - x1) / 2
            else
              x1 - (x1 - x2) / 2
            end
    y_mid = if y2 > y1
              y1 + (y2 - y1) / 2
            else
              y1 - (y1 - y2) / 2
            end
    @extra_lines << "<path d='M#{x1},#{y1} L#{x_mid},#{y_mid} L#{x2}, #{y2}' style='fill: none; stroke: #{col}; stroke-width:#{swidth}; stroke-linecap:round;' #{dasharray} #{string}/>"
  else
    @extra_lines << "<line x1='#{x1}' y1='#{y1}' x2='#{x2}' y2='#{y2}' style='fill: none; stroke: #{col}; stroke-width:#{swidth}; stroke-linecap:round;' #{dasharray} #{string}/>"
  end
end

#generate_line(x1, y1, x2, y2, col, dashed = false, arrow = false, bline = false) ⇒ Object 



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# File 'lib/rsyntaxtree/svg_graph.rb', line 856

def generate_line(x1, y1, x2, y2, col, dashed = false, arrow = false, bline = false)
  string = if arrow
             "marker-end='url(#arrow)' "
           else
             ""
           end
  dasharray = dashed ? "stroke-dasharray='8 8'" : ""
  swidth = bline ? @linewidth + BLINE_SCALING : @linewidth + LINE_SCALING

  "<line x1='#{x1}' y1='#{y1}' x2='#{x2}' y2='#{y2}' style='fill: none; stroke: #{col}; stroke-width:#{swidth}; stroke-linecap:round;' #{dasharray} #{string}/>"
end

#line_to_parent(parent, child) ⇒ Object

Draw a line between child/parent elements. An empty-label element (see Element#empty_label?) is a pass-through joint: the line runs to its center instead of stopping at its (invisible) text box, so the segments on both sides connect without a gap.



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# File 'lib/rsyntaxtree/svg_graph.rb', line 872

def line_to_parent(parent, child)
  return if child.horizontal_indent.zero?

  if @direction == "ltr"
    # LTR: parent's right side → child's left side
    # Y center = midpoint between TTB top-connection and bottom-connection
    # top = vi + hctt/2, bottom = vi + content_height + hctt
    # midpoint = vi + (content_height + hctt * 1.5) / 2
    hctt = @global[:height_connector_to_text]
    y1 = child.vertical_indent + (child.content_height + hctt * 1.5) / 2
    y2 = parent.vertical_indent + (parent.content_height + hctt * 1.5) / 2
    x1 = child.empty_label? ? child.horizontal_indent + child.content_width / 2 : child.horizontal_indent - hctt
    x2 = parent.empty_label? ? parent.horizontal_indent + parent.content_width / 2 : parent.horizontal_indent + parent.content_width + hctt

    if @polyline
      mid_x1 = x2 + (x1 - x2) / 2
      mid_y1 = y1
      mid_x2 = mid_x1
      mid_y2 = y2
      @tree_data += @polyline_styles.sub(/CHIX/, x1.to_s)
                                    .sub(/CHIY/, y1.to_s)
                                    .sub(/MIDX1/, mid_x1.to_s)
                                    .sub(/MIDY1/, mid_y1.to_s)
                                    .sub(/MIDX2/, mid_x2.to_s)
                                    .sub(/MIDY2/, mid_y2.to_s)
                                    .sub(/PARX/, x2.to_s)
                                    .sub(/PARY/, y2.to_s)
    else
      line_data   = @line_styles.sub(/X1/, x1.to_s)
      line_data   = line_data.sub(/Y1/, y1.to_s)
      line_data   = line_data.sub(/X2/, x2.to_s)
      @tree_data += line_data.sub(/Y2/, y2.to_s)
    end
  else
    # TTB: parent's bottom → child's top
    if @polyline
      chi_x = child.horizontal_indent + child.content_width / 2
      chi_y = child.empty_label? ? child.vertical_indent + child.content_height / 2 : child.vertical_indent + @global[:height_connector_to_text] / 2

      par_x = parent.horizontal_indent + parent.content_width / 2
      par_y = parent.empty_label? ? parent.vertical_indent + parent.content_height / 2 : parent.vertical_indent + parent.content_height + @global[:height_connector_to_text]

      mid_x1 = chi_x
      mid_y1 = par_y + (chi_y - par_y) / 2

      mid_x2 = par_x
      mid_y2 = mid_y1

      @tree_data += @polyline_styles.sub(/CHIX/, chi_x.to_s)
                                    .sub(/CHIY/, chi_y.to_s)
                                    .sub(/MIDX1/, mid_x1.to_s)
                                    .sub(/MIDY1/, mid_y1.to_s)
                                    .sub(/MIDX2/, mid_x2.to_s)
                                    .sub(/MIDY2/, mid_y2.to_s)
                                    .sub(/PARX/, par_x.to_s)
                                    .sub(/PARY/, par_y.to_s)
    else
      x1 = child.horizontal_indent + child.content_width / 2
      y1 = child.empty_label? ? child.vertical_indent + child.content_height / 2 : child.vertical_indent + @global[:height_connector_to_text] / 2
      x2 = parent.horizontal_indent + parent.content_width / 2
      y2 = parent.empty_label? ? parent.vertical_indent + parent.content_height / 2 : parent.vertical_indent + parent.content_height + @global[:height_connector_to_text]

      line_data   = @line_styles.sub(/X1/, x1.to_s)
      line_data   = line_data.sub(/Y1/, y1.to_s)
      line_data   = line_data.sub(/X2/, x2.to_s)
      @tree_data += line_data.sub(/Y2/, y2.to_s)
    end
  end
end

#region_subtree_bounds(id) ⇒ Object

Union of element_visual_box over the subtree rooted at id, in final drawing coordinates. Used to size region shades so the whole subtree (labels, enclosures, brackets) sits inside the plane.



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# File 'lib/rsyntaxtree/svg_graph.rb', line 245

def region_subtree_bounds(id)
  b = element_visual_box(@element_list.get_id(id))
  @element_list.get_id(id).children.each do |c|
    cb = region_subtree_bounds(c)
    b[:left] = cb[:left] if cb[:left] < b[:left]
    b[:right] = cb[:right] if cb[:right] > b[:right]
    b[:top] = cb[:top] if cb[:top] < b[:top]
    b[:bottom] = cb[:bottom] if cb[:bottom] > b[:bottom]
  end
  b
end

#render_matrix(e, this_x, text_y, element, col) ⇒ Object

Draws a matrix nested in a label: its own rows and columns, laid out from the sizes Element#measure_lines worked out, inside its own brackets.



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# File 'lib/rsyntaxtree/svg_graph.rb', line 556

def render_matrix(e, this_x, text_y, element, col)
  out = +""
  inner_x = this_x + @global[:width_half_x] * MATRIX_BRACKET_ROOM
  baseline = text_y
  prev_height = nil

  e[:matrix].each_with_index do |line, idx|
    next unless line[:type] == :text

    baseline += prev_height if idx.positive? && prev_height
    baseline += line[:top_room].to_f
    prev_height = line[:elements].map { |x| x[:height] }.max
    pen = inner_x
    line[:elements].each do |cell|
      markup, pen = if cell[:decoration].include?(:matrix)
                      render_matrix(cell, pen, baseline, element, col)
                    else
                      render_run(cell, pen, baseline, element, col)
                    end
      out << markup
    end
  end

  # The bracket encloses the matrix and its own padding. The separation
  # from the rows either side is already in the baseline this was called
  # with, so taking it off here again would cancel it out and leave two
  # stacked blocks touching.
  padding = @global[:single_x_metrics].height * MATRIX_VERTICAL_ROOM
  top = text_y - @global[:single_x_metrics].height * 0.8 - padding
  draw_bracket(this_x, top, e[:width], e[:matrix_height] + padding * 2, col)
  [out, this_x + e[:width]]
end

#render_run(e, this_x, text_y, element, col) ⇒ Object

Draws one run of a label — a stretch of text with its decorations, or the box, circle or bar drawn around it — at the given pen position, and reports where the pen ends up. A nested matrix draws its own runs through here, so this could no longer live inside the drawing loop.



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# File 'lib/rsyntaxtree/svg_graph.rb', line 437

def render_run(e, this_x, text_y, element, col)
  out = +""
  this_y = text_y
    escaped_text = e[:text].gsub('>', '&gt;').gsub('<', '&lt;');
    decorations = []
    decorations << "overline" if e[:decoration].include?(:overline)
    decorations << "underline" if e[:decoration].include?(:underline)
    decorations << "line-through" if e[:decoration].include?(:linethrough)
    decoration = "text-decoration=\"" + decorations.join(" ") + "\""

    style = "style=\""
    if e[:decoration].include?(:small)
      style += "font-size: #{(SUBSCRIPT_CONST.to_f * 100).to_i}%; "
      this_y = text_y - ((@global[:single_x_metrics].height - @global[:single_x_metrics].height * SUBSCRIPT_CONST) / 4) + 2
    elsif e[:decoration].include?(:superscript)
      style += "font-size: #{(SUBSCRIPT_CONST.to_f * 100).to_i}%; "
      this_y = text_y - (@global[:single_x_metrics].height / 4) + 1
    elsif e[:decoration].include?(:subscript)
      style += "font-size: #{(SUBSCRIPT_CONST.to_f * 100).to_i}%; "
      this_y = text_y + 4
    else
      this_y = text_y
    end

    style += "font-weight: bold; fill: #{@col_emph}; " if e[:decoration].include?(:bold) || e[:decoration].include?(:bolditalic)
    style += "font-style: italic; " if e[:decoration].include?(:italic) || e[:decoration].include?(:bolditalic)
    style += "\""

    fontstyle = FontFamily.for_svg(@fontstyle, cjk_priority: e[:cjk])

    if e[:decoration].include?(:box) || e[:decoration].include?(:circle) || e[:decoration].include?(:bar)
      # Measured around the enclosed marks in Element#setup; the line
      # height would draw the shape taller than what it encloses.
      enc_height = e[:enc_height] || e[:height]
      enc_y = this_y - (e[:enc_above] || e[:height] * 0.8)
      enc_width = e[:width]
      enc_x = this_x

      if e[:decoration].include?(:hatched)
        case element.type
        when ETYPE_LEAF
          fill = if @color
                   "url(#hatchForLeaf)"
                 else
                   "url(#hatchBlack)"
                 end
        when ETYPE_NODE
          fill = if @color
                   "url(#hatchForNode)"
                 else
                   "url(#hatchBlack)"
                 end
        end
      else
        fill = "none"
      end

      enc = nil

      stroke_width = if e[:decoration].include?(:bstroke)
                       @linewidth + BLINE_SCALING
                     else
                       @linewidth + LINE_SCALING
                     end

      if e[:decoration].include?(:box)
        enc = "<rect style='stroke: #{col}; stroke-linejoin:round; stroke-width:#{stroke_width};'
                x='#{enc_x}' y='#{enc_y}'
                width='#{enc_width}' height='#{enc_height}'
                fill='#{fill}' />\n"
      elsif e[:decoration].include?(:circle)
        enc = "<rect style='stroke: #{col}; stroke-width:#{stroke_width};'
                x='#{enc_x}' y='#{enc_y}' rx='#{enc_height / 2}' ry='#{enc_height / 2}'
                width='#{enc_width}' height='#{enc_height}'
                fill='#{fill}' />\n"
      elsif e[:decoration].include?(:bar)
        x1 = enc_x
        y1 = enc_y + enc_height / 2
        x2 = enc_x + enc_width
        y2 = y1
        ar_hwidth = e[:width] / 4.0
        bar = "<line style='fill:none; stroke:#{col}; stroke-linejoin:round; stroke-linecap:round; stroke-width:#{stroke_width};' x1='#{x1 + stroke_width / 2}' y1='#{y1}' x2='#{x2 - stroke_width / 2}' y2='#{y2}'></line>\n"
        @extra_lines << bar

        if e[:decoration].include?(:arrow_to_l)
          l_arrowhead = "<polyline stroke-linejoin='round' stroke-linecap='round' fill='none' stroke='#{col}' stroke-width='#{stroke_width}' points='#{x1 + ar_hwidth},#{y1 + ar_hwidth / 2} #{x1 + stroke_width / 2},#{y1} #{x1 + ar_hwidth},#{y1 - ar_hwidth / 2}' />\n"
          @extra_lines << l_arrowhead
        end

        if e[:decoration].include?(:arrow_to_r)
          r_arrowhead = "<polyline stroke-linejoin='round' stroke-linecap='round' fill='none' stroke='#{col}' stroke-width='#{stroke_width}' points='#{x2 - ar_hwidth},#{y2 - ar_hwidth / 2} #{x2 - stroke_width / 2},#{y2} #{x2 - ar_hwidth},#{y2 + ar_hwidth / 2}' />\n"
          @extra_lines << r_arrowhead
        end
      end

      @extra_lines << enc if enc

      # Centre the marks in the shape. e[:width] is the shape's width,
      # e[:content_width] the marks' own, so half the difference is the
      # left inset — the line height used to stand in for the shape's
      # width here, which left the glyph off-centre once the shape was
      # measured from its content instead.
      inset = (e[:width] - e[:content_width]) / 2
      this_x += inset
      out << set_tspan(this_x, this_y, style, decoration, fontstyle, escaped_text)
      this_x += e[:content_width] + inset

    elsif e[:decoration].include?(:whitespace)
      return [out, this_x + e[:width]]
    else
      out << set_tspan(this_x, this_y, style, decoration, fontstyle, escaped_text)
      this_x += e[:width]
    end

  [out, this_x]
end

#set_tspan(this_x, this_y, style, decoration, fontstyle, text) ⇒ Object 



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# File 'lib/rsyntaxtree/svg_graph.rb', line 604

def set_tspan(this_x, this_y, style, decoration, fontstyle, text)
  text.gsub!(/￭+/) do |x|
    num_spaces = x.size
    "<tspan style='fill:none;'>" + "￭" * num_spaces + "</tspan>"
  end
  "<tspan x='#{this_x}' y='#{this_y}' #{style} #{decoration} font-family=\"#{fontstyle}\">#{text}</tspan>\n"
end

#svg_data ⇒ Object 



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# File 'lib/rsyntaxtree/svg_graph.rb', line 55

def svg_data
  metrics = parse_list

  # Region shades depend on the final element positions and on the node
  # content_height that draw_element recomputes, so collect them only
  # after parse_list (which runs draw_elements) has completed.
  collect_region_shades

  @width = metrics[:width] + @global[:h_gap_between_nodes] * 2
  @height = metrics[:height] + @global[:height_connector_to_text] / 2

  x1 = 0 - @global[:h_gap_between_nodes]
  y1 = 0
  x2 = @width + @global[:h_gap_between_nodes]
  y2 = @height + @global[:height_connector_to_text] / 2

  # Grow the canvas so region shades that reach past the tree's own bounds
  # (e.g. a region on the root node, or one whose padded edge extends beyond
  # the deepest leaf) keep a margin instead of touching the image edge. A
  # margin is added around the region extents before unioning with the tree
  # bounds. x2/y2 are the viewBox width/height, so right = x1 + x2.
  if @region_bounds
    rb = @region_bounds
    m = @global[:h_gap_between_nodes]
    left = [x1, rb[:min_x] - m].min
    top = [y1, rb[:min_y] - m].min
    right = [x1 + x2, rb[:max_x] + m].max
    bottom = [y1 + y2, rb[:max_y] + m].max
    new_x2 = right - left
    new_y2 = bottom - top
    @width += new_x2 - x2
    @height += new_y2 - y2
    x1 = left
    y1 = top
    x2 = new_x2
    y2 = new_y2
  end

  extra_lines = @extra_lines.join("\n")

  as2 = @global[:h_gap_between_nodes] * 1.0
  as4 = as2 * 3

  header = <<~HDR
    <?xml version="1.0" standalone="no"?>
    <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
      <svg width="#{x2}" height="#{y2}" viewBox="#{x1}, #{y1}, #{x2}, #{y2}" version="1.1" xmlns="http://www.w3.org/2000/svg">
      <defs>
        <marker id="arrow" markerUnits="userSpaceOnUse" viewBox="0 0 10 10" refX="10" refY="5" markerWidth="#{as2}" markerHeight="#{as2}" orient="auto">
          <path d="M 0 0 L 10 5 L 0 10" fill="#{@col_extra}"/>
        </marker>
        <marker id="arrowBackward" markerUnits="userSpaceOnUse" viewBox="0 0 10 10" refX="5" refY="5" markerWidth="#{as2}" markerHeight="#{as2}" orient="auto">
          <path d="M 0 0 L 10 5 L 0 10 z" fill="#{@col_extra}"/>
        </marker>
        <marker id="arrowForward" markerUnits="userSpaceOnUse" viewBox="0 0 10 10" refX="5" refY="5" markerWidth="#{as2}" markerHeight="#{as2}" orient="auto">
          <path d="M 10 0 L 0 5 L 10 10 z" fill="#{@col_extra}"/>
        </marker>
        <marker id="arrowBothways" markerUnits="userSpaceOnUse" viewBox="0 0 30 10" refX="15" refY="5" markerWidth="#{as4}" markerHeight="#{as2}" orient="auto">
          <path d="M 0 5 L 10 0 L 10 5 L 20 5 L 20 0 L 30 5 L 20 10 L 20 5 L 10 5 L 10 10 z" fill="#{@col_extra}"/>
        </marker>
        <pattern id="hatchBlack" x="10" y="10" width="10" height="10" patternUnits="userSpaceOnUse" patternTransform="rotate(45)">
          <line x1="0" y="0" x2="0" y2="10" stroke="black" stroke-width="4"></line>
        </pattern>
        <pattern id="hatchForNode" x="10" y="10" width="10" height="10" patternUnits="userSpaceOnUse" patternTransform="rotate(45)">
          <line x1="0" y="0" x2="0" y2="10" stroke="#{@col_node}" stroke-width="4"></line>
        </pattern>
        <pattern id="hatchForLeaf" x="10" y="10" width="10" height="10" patternUnits="userSpaceOnUse" patternTransform="rotate(45)">
          <line x1="0" y="0" x2="0" y2="10" stroke="#{@col_leaf}" stroke-width="4"></line>
        </pattern>
      </defs>
  HDR

  rect = <<~RCT
    <rect x="#{x1}" y="#{y1}" width="#{x2}" height="#{y2}" stroke="none" fill="white" />
  RCT

  footer = "</svg>"

  # Region shades go at the very back: above the white background but
  # below tree connectors and labels.
  shades = @region_shades.join

  if @transparent
    header + shades + @tree_data + extra_lines + footer
  else
    header + rect + shades + @tree_data + extra_lines + footer
  end
end

#triangle_to_parent(parent, child) ⇒ Object

Draw a triangle between child/parent elements



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# File 'lib/rsyntaxtree/svg_graph.rb', line 943

def triangle_to_parent(parent, child)
  return if child.horizontal_indent.zero?

  if @direction == "ltr"
    # LTR: triangle opens vertically (top-bottom of child),
    # apex at parent's right side.
    # Use same vertical reference and dimensions as TTB uses horizontally.
    hctt = @global[:height_connector_to_text]
    child_y_center = child.vertical_indent + (child.content_height + hctt * 1.5) / 2
    parent_y_center = parent.vertical_indent + (parent.content_height + hctt * 1.5) / 2
    tri_half = @global[:single_x_metrics].height / 2
    x1 = child.horizontal_indent - @global[:height_connector_to_text] / 2
    y1 = child_y_center - tri_half
    x2 = child.horizontal_indent - @global[:height_connector_to_text] / 2
    y2 = child_y_center + tri_half
    x3 = parent.horizontal_indent + parent.content_width + @global[:height_connector_to_text]
    y3 = parent_y_center
  else
    # TTB: triangle opens horizontally (left-right of child text),
    # apex at parent's bottom
    x1 = child.horizontal_indent
    y1 = child.vertical_indent + @global[:height_connector_to_text] / 2
    x2 = child.horizontal_indent + child.content_width
    y2 = child.vertical_indent + @global[:height_connector_to_text] / 2
    x3 = parent.horizontal_indent + parent.content_width / 2
    y3 = parent.vertical_indent + parent.content_height + @global[:height_connector_to_text]
  end

  polygon_data = @polygon_styles.sub(/X1/, x1.to_s)
  polygon_data = polygon_data.sub(/Y1/, y1.to_s)
  polygon_data = polygon_data.sub(/X2/, x2.to_s)
  polygon_data = polygon_data.sub(/Y2/, y2.to_s)
  polygon_data = polygon_data.sub(/X3/, x3.to_s)
  @tree_data  += polygon_data.sub(/Y3/, y3.to_s)
end