First image generation poc

.gitignore

@@ -2,3 +2,4 @@
 .bundle
 pkg/*
 vendor/*
+tmp/*

lib/traptcha.rb

@@ -1,2 +1,4 @@
+require 'traptcha/image'
+
 module Traptcha
 end

lib/traptcha/image.rb

@@ -0,0 +1,34 @@
+module Traptcha
+  class Image
+    def initialize(text)
+      @text = text
+      @canvas = Magick::Image.new(150, 100)
+      @canvas.format = "PNG"
+    end
+
+    def save(path)
+      generate
+      @canvas.write(File.join(path, @text + ".png"))
+    end
+
+    protected
+
+    def generate
+      image = ::Magick::Draw.new
+
+      image.font_family = "Thonburi"
+      image.font_weight = ::Magick::BoldWeight
+
+      position = 0
+
+      @text.chars.each do |letter|
+        image.annotate(@canvas, 0, 0, position, 90, letter) do
+          self.fill = "black"
+          self.pointsize = (20..50).to_a.choice
+        end
+
+        position += (20..25).to_a.choice
+      end
+    end
+  end
+end

spec/spec_helper.rb

@@ -0,0 +1 @@
+require 'traptcha'

spec/traptcha/image_spec.rb

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+require "spec_helper"
+require "rmagick"
+require "fileutils"
+
+describe Traptcha::Image do
+  describe "save" do
+    subject { Traptcha::Image.new("test") }
+    let(:path) { File.expand_path(File.dirname(__FILE__) + "../../../tmp/image_spec") }
+
+    before do
+      FileUtils.mkdir_p path
+    end
+
+    it "saves a image file on an specific path" do
+      expect { subject.save(path) }.to change { Dir["#{path}/*"].size }
+    end
+
+    after do
+      FileUtils.rm_rf path
+    end
+  end
+end