From Rosetta Code
This is an example of a library. You may see a list of other libraries used on Rosetta Code at Category:Solutions by Library.

Wren-polygon is a module which enables arbitrary polygons to be drawn and/or filled within a DOME script using the Wren programming language. It consists of four classes: Polygon, Rectangle, Square and Selectable. The last named is an abstract class from which the other three inherit and enables them to be treated as buttons.

It is the twenty-second in a series of modules (listed on the language's main page) designed to assist with writing Rosetta Code tasks so the same code does not have to be written or copy/pasted time and time again thereby bloating a task's script code unnecessarily.

To use it you need to copy the source code (in the talk page) to a text file called polygon.wren and place this in the same directory as the importing script so DOME can find it.

Wren-polygon depends on the graphics and math modules which are part of the DOME framework. As such it can only be used in a DOME script.