Paper.js

Paper.js provides a Document Object Model (also called a Scene Graph) that is very easy to work with.

Paper.js makes is very easy to create and paths and add segments to them,and easy to manipulated segments.

Paper.js Supports mouse interaction and keyboard interaction.

SVG Import and Export, Raster Images, Color Averaging, Symbols, Selection Outlines, Vector Geometry, Mathematical Operations

Flexibility in parameter conversion when passing values to functions