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    Ongoing observations by End Point Dev people

    Three Things: ImageMagick, RequestBin, Responsivness

    Steph Skardal

    By Steph Skardal
    June 28, 2012

    It’s been a while since I wrote a Three Things blog article, where I share tidbits that I’ve learned that don’t quite make it into a full blog post, but are still worth sharing!

    Image Stacking via Command Line

    I recently needed to stack several images to CSS spritify them. I did some quick searching and found the following ImageMagick command line functionality:

    convert add.png add_ro.png -append test.png
    convert add.png add_ro.png +append test.png

    The -append argument will stack the images vertically, and +append will stack the images horizontally.


    Recently, I needed to quickly examine the contents sent during a payment transaction. Richard pointed me to RequestBin a neat and quick tool for examining the contents of an external request. I was testing the Elavon payment gateway integrated in an application using Piggybak. In my code, I made the following change:

    class ElavonGateway < ViaklixGateway
      self.test_url = 'https://demo.myvirtualmerchant.com/VirtualMerchantDemo/process.do'
      self.live_url = 'https://www.myvirtualmerchant.com/VirtualMerchant/process.do'
    + self.test_url = 'http://requestb.in/abc1def2'

    I ran through a single checkout, then visited the RequestBin inspect URL to examine the variables passed to the payment gateway, to see the following data (the text overwrites itself in Chrome):

    RequestBin example output.

    A Responsiveness Tool

    I’ve been working on responsiveness for a couple of sites recently. One of my clients pointed out responsivepx, which allows you to toggle the width of your browser to review various responsive layouts.

    browsers mobile