Point-on-line

Test whether a point is on a line or LineString.

Installation

Install via npm:

npm install point-on-line

Usage

var pointOnLine = require("point-on-line");

pointOnLine([[0,0],[1,1]],[0.5,0.5]); // true
pointOnLine([[0,0],[1,4],[6,3]],[9,3]); // false
pointOnLine("sharks","pizza"); // Error

pointOnLine(line,point)

Returns true if point is on any of the line segments in line, including the endpoints.

Returns false otherwise.

line needs to be one of the following:

• An array of x/y (or lng/lat) coordinate pairs (e.g. [[0,1],[2,2],[3,3]] is a jagged line with three points)
• A GeoJSON feature that has a geometry of type LineString
• A GeoJSON geometry of type LineString

point needs to be one of the following:

• An x/y (or lng/lat) coordinate pair (e.g. [51,75])
• A GeoJSON feature that has a geometry of type Point
• A GeoJSON geometry of type Point

Precision issues

The limitations of JavaScript float precision may cause some problems. Any integers and well under 2^53 should be fine.