A primer on vector graphics

For rastered image formats like JPG or PNG, each pixel is basically drawn on a fixed size canvas. To display such an image in a different size (say: 1.5 times larger than original), the renderer (your Browser / GPU...

RubyMine: Set specific Ruby version per project

Intro

Embedding videos on a website is very easy, add a <video> tag to your source code and it just works. Most of the time.

The thing is: Both the **operating system and Browser of your client must support the container ...

When you find yourself constantly ignoring a RubyMine warning, you can simple disable that warning and de-clutter your editor. E.g. in my Cucumber scenarios RubyMine underlines 90% of all lines because it does not know about [spreewald](https://gi...

ImageMagick has a command line tool called identify which can read image metadata:

>identify -verbose DSC00136.JPG
Image: DSC00136.JPG
  Format: JPEG (Joint Photographic Experts Group JFIF format)
  Class: DirectClass
  Geometry: 5472x3648+...

Navigation

CTRL + SHIFT + ALT + N
: Search for any symbol in your application, like CSS classes, Ruby classes, methods, helpers etc.

CTRL + SHIFT + N
: Search for filename in your application (also dependencies)

CTRL + E
: Open...

Every time you open a directory containing images, Windows creates those pesky Thumbs.db files for a minor speed-up and lots of cluttering your zip files etc.

You do want to disable them. Here is how on Windows 7:

1. Start → Run (or press Me...

Submit buttons in Rails come with a useful option :disable_with which will disable the button when clicked and change its label to something like "Please wait...".

An annoying side effect of that feature is that when you use the back button to ...

While verifying doubles in RSpec is a good default, it is limited in the amount of methods it actually is able to verify.

The background is that RSpec can't verify dynamica...