jPolygon is a javascript library that allows drawing a polygon in a HTML5 canvas over an image. It supports undo and clear funcions. To finalize the polygon press CTRL + mouse Click.

Technologies used:

• pure javascript (no jQuery, etc...)
• HTML5 canvas

Requirements:

• Any browser that supports HTML5 canvas

Main Features:

• Mark points with a square.
• Undo function implementation.
• Clear function implementation.
• When a polygon is created, fill the content with a transparent color.

License:

• MIT license

URL:

• Project sources are hosted on Github
• A live demo is available here