Class: Magick::RVG::Utility::LRTextStrategy

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

Overview

class TextStrategy

Instance Method Summary collapse

Methods inherited from TextStrategy

#enquote, #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 183

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

#get_word_spacing ⇒ Object 



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# File 'lib/rvg/misc.rb', line 178

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

#render(x, y, text) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 188

def render(x, y, text)
    x_rel_coords, y_rel_coords = text_rel_coords(text)
    dx = x_rel_coords.inject(0) {|sum, a| sum + a}
    dy = y_rel_coords.max

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

    # Align the first glyph
    case @ctx.text_attrs.glyph_orientation_horizontal
        when 0
            ;
        when 90
            y -= dy
        when 180
            x += x_rel_coords.shift
            x_rel_coords << 0
            y -= dy
        when 270
            x += x_rel_coords[0]
    end

    y += shift_baseline(@ctx.text_attrs.glyph_orientation_horizontal, text[0,1])

    first_word = true
    text.split(::Magick::RVG::WORD_SEP).each do |word|
        unless first_word
            x += x_rel_coords.shift
        end
        first_word = false
        word.split('').each do |glyph|
            render_glyph(@ctx.text_attrs.glyph_orientation_horizontal, x, y, glyph)
            x += x_rel_coords.shift
        end
    end

    @ctx.gc.pop()
    [dx, 0]
end