Created
May 7, 2012 09:52
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| require "rubygems" | |
| require "capybara-webkit" | |
| require "mini_magick" | |
| class WebkitScreenshot | |
| def initialize | |
| @browser = Capybara::Driver::Webkit::Browser.new | |
| end | |
| def browser | |
| @browser | |
| end | |
| def visit(url) | |
| browser.visit(url) | |
| end | |
| # Result sample: {"bottom"=>186, "height"=>110, "left"=>0, "right"=>276, "top"=>76, "width"=>276} | |
| def rect(elem_id) | |
| browser.evaluate_script <<-EOF | |
| var elem = document.getElementById('#{elem_id}'); | |
| Capybara.reflow(elem); | |
| elem.getBoundingClientRect(); | |
| EOF | |
| end | |
| # Result sample: {"x"=>953, "y"=>42} | |
| def offset(elem_id) | |
| browser.evaluate_script <<-EOF | |
| var elem = document.getElementById('#{elem_id}'); | |
| Capybara.reflow(elem); | |
| Capybara.centerPostion(elem); | |
| EOF | |
| end | |
| def output(options = {}) | |
| filename = options[:filename] || "out.png" | |
| width = options[:width] || 1000 | |
| height = options[:height] || 10 | |
| browser.render(filename, width, height) | |
| filename | |
| end | |
| def output_by_elem(elem_id, options = {}) | |
| filename = options[:filename] || "elem.png" | |
| img = MiniMagick::Image.open(output) | |
| img.crop(crop_param(elem_id)) | |
| img.write(filename) | |
| end | |
| WRAP_WIDTH = 40 | |
| def crop_param(elem_id) | |
| params_rect = rect(elem_id) | |
| params_offset = offset(elem_id) | |
| width = params_rect['width'] + WRAP_WIDTH | |
| height = params_rect['height'] + WRAP_WIDTH | |
| offset_x = params_offset['x'] - params_rect['width']/2 - WRAP_WIDTH/2 | |
| offset_x = 0 if offset_x < 0 | |
| offset_y = params_offset['y'] - params_rect['height']/2 - WRAP_WIDTH/2 | |
| offset_y = 0 if offset_y < 0 | |
| "#{width}x#{height}+#{offset_x}+#{offset_y}" | |
| end | |
| end | |
| if __FILE__ == $0 | |
| ws = WebkitScreenshot.new | |
| ws.visit "http://www.google.co.jp/" | |
| ws.output_by_elem('hplogo', filename: "google.png") | |
| ws.visit "http://www.sonicgarden.jp/" | |
| ws.output_by_elem('nav', filename: "nav.png") | |
| ws.visit "http://www.sonicgarden.jp/" | |
| ws.output_by_elem('facebook', filename: "facebook.png") | |
| ws.visit "https://www.facebook.com/" | |
| ws.output_by_elem('loginbutton', filename: "loginbutton.png") | |
| ws.visit "https://www.facebook.com/" | |
| ws.output_by_elem('registration_container', filename: "registration_container.png") | |
| end |
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