Taking a screenshot bigger than the physical screen size

Question

Hello, I need to take a screenshot that includes parts not on screen. 

 

Image of what i need: https://drive.google.com/file/d/0B5AXiesUBkuxdVg5NnA0Y2ktcEU/view?usp=sharing

The screenshot must be able to be taken at any size.

 

Thank you, for your feedback.