Pure Javascript alternative to path.getPointAtLength(t) and getTotalLength() functions. Works with Canvas & Node
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.


Build Status Coverage Status


Pure Javascript alternative to getPointAtLength(t) and getTotalLength() functions. Works with Canvas and Node

JavaScript can access to path elements properties in a browser, such as its length and the point at a given length. Unfortunately, this can't be achieved using a Canvas element or when working with node. This library can be used to replace this need. It has no dependencies on other JavaScript libraries.


To use with npm, just type

npm install svg-path-properties


var path = require("svg-path-properties");
var properties = path.svgPathProperties("M0,100 Q50,-50 100,100 T200,100");
var length = properties.getTotalLength();
var point = properties.getPointAtLength(200);
var tangent = properties.getTangentAtLength(200);
var allProperties = properties.getPropertiesAtLength(200);
var parts = properties.getParts(); --> Gets an array with the different sections of the path, each element containing the initial and final points, the length and the curve function

Check this block to see how it works with the browser.


Some parts of the code are taken from other libraries or questions at StackOverflow:

For Bézier curves:

For path parsing: