Module: Marvi::Diagram::BoxDrawing

Included in:
FlowchartRenderer, SequenceRenderer
Defined in:
lib/marvi/diagram.rb

Overview

Shared helpers for renderers that lay nodes out as labelled boxes.

Constant Summary collapse

BOX_HEIGHT = 
3

Instance Method Summary collapse

Instance Method Details

#box_width(label) ⇒ Object 



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# File 'lib/marvi/diagram.rb', line 103

def box_width(label)
  Unicode::DisplayWidth.of(label) + 4
end

#draw_box(grid, top, left, label) ⇒ Object

Draws a three-line box with its top-left corner at (top, left).



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# File 'lib/marvi/diagram.rb', line 108

def draw_box(grid, top, left, label)
  inner = Unicode::DisplayWidth.of(label) + 2
  grid.set(top, left, "┌")
  grid.set(top, left + inner + 1, "┐")
  grid.set(top + 2, left, "└")
  grid.set(top + 2, left + inner + 1, "┘")
  (1..inner).each do |i|
    grid.set(top, left + i, "─")
    grid.set(top + 2, left + i, "─")
  end
  grid.set(top + 1, left, "│")
  grid.set(top + 1, left + inner + 1, "│")

  col = left + 2
  label.each_char do |ch|
    grid.set(top + 1, col, ch)
    width = Unicode::DisplayWidth.of(ch)
    grid.set(top + 1, col + 1, WIDE_FILLER) if width == 2
    col += width
  end
end