Generate screenshots for a Ruby on Rails application

 

Install gem by 

$ gem install screencap

This command will install screencap on your machine

If you need to use gem from your Rails application then you need to add it to the Gemfile

gem 'screencap'

After adding to Gemfile, bundle

bundle

This command will ensure the availability of your gem your Ruby On Rails application

Usage
Using screencap gem to capture screenshots is fairly easy. The following code will help you capture screenshots with ruby -

require 'screencap'
fetcher_object = Screencap::Fetcher.new('https://www.shadbox.com')
screenshot = fetcher_object.fetch

The fetch method supports various options as given below -

screenshot = fetcher_object.fetch(
output: '~/public/file-name.png',
# optional parameters:
div: '.class-name', # CSS selector
width: 500, # Width of Screenshot - Viewport
height: 420, # Height of Screenshot - Viewport
top: 0, left: 0, width: 100, height: 100 # Area to capture screenshot of)

I Hope, the above tutorial helps you to capture screenshots with Ruby. Please feel free to comment down below.