Class: Magick::RVG::Utility::TBTextStrategy

Inherits:
TextStrategy show all
Defined in:
lib/rvg/misc.rb

Overview

class RLTextStrategy

Instance Method Summary collapse

Methods inherited from TextStrategy

#glyph_metrics, #initialize, #render_glyph, #shift_baseline, #text_rel_coords

Constructor Details

This class inherits a constructor from Magick::RVG::Utility::TextStrategy

Instance Method Details

#get_letter_spacing(glyph) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 213

def get_letter_spacing(glyph)
  gx, gy = glyph_metrics(@ctx.text_attrs.glyph_orientation_vertical, glyph)
  [gx, gy + @ctx.text_attrs.letter_spacing]
end

#get_word_spacing ⇒ Object 



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# File 'lib/rvg/misc.rb', line 208

def get_word_spacing
  @word_space ||= glyph_metrics(@ctx.text_attrs.glyph_orientation_vertical, ' ')[1]
  [0, @word_space + @ctx.text_attrs.word_spacing]
end

#render(x, y, text) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 218

def render(x, y, text)
  x_rel_coords, y_rel_coords = text_rel_coords(text)
  dx = x_rel_coords.max
  dy = y_rel_coords.sum

  # We're handling the anchoring.
  @ctx.gc.push
  @ctx.gc.text_anchor(Magick::StartAnchor)
  if @ctx.text_attrs.text_anchor == :end
    y -= dy
  elsif @ctx.text_attrs.text_anchor == :middle
    y -= dy / 2
  end

  # Align the first glyph such that its center
  # is aligned on x and its top is aligned on y.

  case @ctx.text_attrs.glyph_orientation_vertical
  when 0
    x -= x_rel_coords.max / 2
    y += y_rel_coords[0]
  when 90
    x -= x_rel_coords.max / 2
  when 180
    x += x_rel_coords.max / 2
  when 270
    x += x_rel_coords.max / 2
    y += y_rel_coords.shift
    y_rel_coords << 0 # since we used an element we need to add a dummy
  end

  x -= shift_baseline(@ctx.text_attrs.glyph_orientation_vertical, text[0, 1])

  first_word = true
  text.split(::Magick::RVG::WORD_SEP).each do |word|
    unless first_word
      y += y_rel_coords.shift
      x_rel_coords.shift
    end
    first_word = false
    word.chars.each do |glyph|
      case @ctx.text_attrs.glyph_orientation_vertical.to_i
      when 0, 90, 270
        x_shift = (dx - x_rel_coords.shift) / 2
      when 180
        x_shift = -(dx - x_rel_coords.shift) / 2
      end

      render_glyph(@ctx.text_attrs.glyph_orientation_vertical, x + x_shift, y, glyph)
      y += y_rel_coords.shift
    end
  end

  @ctx.gc.pop
  [0, dy]
end