Rmagick Rvg hebrew issue

[alexey]

Hi,
I am generating images with multilingual annotations (english,
russian, hebrew, and more)
Problem is in rtl languages like hebrew.

Writing order are reversed, if string = "שלום" its outputted to image
like "םולש"

title.tspan(string,10, 200).styles
(:font_size=>font_size, :fill=>color, :font_weight => fw)

any ideas?
(except detect string language and resort it:))

[Vladimir Tkach]

To create images from the unicode text, we can use the "encoding" method for the Draw object.

Example:

require "RMagick"

def show_textimg
bg = Magick::Image.new(120,20){self.background_color = "#9E9E9E"}
text = Magick::Draw.new
text.encoding = "Unicode"
text.text(23,14,"ドの半角⇔全角")
text.draw(bg)
bg.write "#{RAILS_ROOT}/public/images/text.jpg"
end

2009/11/25 alexey <alex.cr...@gmail.com>

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[Elad Meidar]

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Elad Meidar

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[Zohar Arad]

Hey

Here's a snippet I use for generating buttons with Hebrew text using RMagick.

# string reversal method

def reverse(orig)

src = orig.force_encoding(Encoding::UTF_8).reverse.to_s

tgt = ''

tmp = []

src.each_char do |c|

if c =~ /[a-zA-Z0-9]/

tmp << c

else

if tmp.length > 0

tgt += tmp.reverse.join('')

tmp.clear

end

tgt += c

end

end

if tmp.length > 0

tgt += tmp.reverse.join('')

tmp.clear

end

tgt

end

end

# button generation method

def generate_button(text)

str = reverse(text)

base_path = File.join(File.dirname(__FILE__),'/../assets/')

canvas = Magick::Image.read(base_path+'button_bg.png').first

text = Magick::Draw.new

text.encoding = 'utf-8'

text.font = base_path+'goldfingerbold.ttf'

text.pointsize = 14

text.gravity = Magick::EastGravity

text.annotate(canvas, 0,0,10,-13, str) {

self.fill = 'white'

}

text.annotate(canvas, 0,0,10,12, str) {

self.fill = 'white'

}

canvas.format = 'PNG'

return canvas

end

Naturally, button and font assets may vary depending on your needs.

The main principle is to reverse the Hebrew string (and then un-reverse alpha-numeric characters) and use Magick::EastGravity to align text from right to left.

Also, if you can use a relatively recent version of ImageMagick (6.5) i recommend it. Using the above with ImageMagick 6.3 produces slightly worse results (font is rendered less clearly).

Hope this helps

Zohar