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sinatraとrmagickで画像にテキストを合成する簡単なサンプル

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やってみた

フォーム送信されたテキストをImageMagickで吹き出し画像と合成するための簡単なサンプルを作りました。
ImageMagickとrmagickのインストールが必要です。

# encoding: utf-8
require 'sinatra'
require 'rmagick'

class App < Sinatra::Base

  get '/' do
    slim :index
  end

  post '/' do
    message = params['message']
    image = Magick::ImageList.new('public/image.png')
    draw = Magick::Draw.new
    draw.annotate(image, 0, 0, 50, 100, message) do
      self.font = 'public/logotype.otf'
      self.fill = '#333333'
      self.align = Magick::LeftAlign
      self.stroke = 'transparent'
      self.pointsize = 30
      self.text_antialias = true
      self.kerning = 1
    end
    image.write('public/temp.png')
    slim :index
  end

end

結果

skitch.png

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