RMagickで動的に画像を生成

RUBY RAILS

速いかな…？


require 'RMagick'

class ImageController < ApplicationController
  def rm
    canvas = Magick::Image.new(240, 300, Magick::HatchFill.new('white','lightcyan2'))
    gc = Magick::Draw.new

    # Draw ellipse
    gc.stroke('red')
    gc.stroke_width(3)
    gc.fill_opacity(0)
    gc.ellipse(120, 150, 80, 120, 0, 270)||<

    # Draw endpoints
    gc.stroke('gray50')
    gc.stroke_width(1)
    gc.circle(120, 150, 124, 150)
    gc.circle(200, 150, 204, 150)
    gc.circle(120,  30, 124,  30)

    # Draw lines
    gc.line(120, 150, 200, 150)
    gc.line(120, 150, 120,  30)

    # Annotate
    gc.stroke('transparent')
    gc.fill('black')
    gc.text(130, 35, "End")
    gc.text(188, 135, "Start")
    gc.text(130, 95, "'Height=120'")
    gc.text(55, 155, "'Width=80'")

    gc.draw(canvas)

    send_data canvas.to_blob { self.format = 'png' }, :type => 'image/png', :disposition => 'inline'
  end
end