npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

line-interpolate-points

v1.0.5

Published

Exposes a function to interpolate any number of points along a multi-segment line (LineString).

Downloads

2,150

Readme

NPM

line interpolate points

A Node module that interpolates the coordinates of any number of equidistant points along a line composed of one or more line segments, at an optional offset. It's particularly useful for GIS applications, and is analogous to the PostGIS ST_LineInterpolatePoint() and Python Shapely's shapely.geometry.LineString.interpolate(). Here's an example of points interpolated over different multi-segment lines (the second group has been offset):

A range of points interpolated along a multi-segment line.

the api

The module exports a single function, interpolateLineRange( ctrlPoints, number, offsetDist ).

  • ctrlPoints is an array of 2D point arrays, like [ [ 5, 10 ], [ 7, 10 ], [ 14, 13 ] ]
  • number is the number of points to interpolate (the endpoints included)
  • offsetDist is an optional distance to move each interpolated point from its container line segment.
  • minGap is an optional minimum distance to maintain between subsequent interpolated points (offsetDist is not taken into account here, as spacing between points is measured along the LineString). May decrease number if the gap between neighbors with that number of points would be lower than minGap.
> var interpolateLineRange = require( 'line-interpolate-points' )
> interpolateLineRange( [ [ 3, 10 ], [ 4, 10 ] ], 2 )
[ [ 3, 10 ], [ 4, 10 ] ]
> interpolateLineRange( [ [ 3, 10 ], [ 4, 10 ] ], 4 )
[ [ 3, 10 ],
  [ 3.3333333333333335, 10 ],
  [ 3.666666666666667, 10 ],
  [ 4, 10 ] ]
> interpolateLineRange( [ [ 4, 4 ], [ 4, 10 ], [ 7, 17 ] ], 6, 1 )
[ [ 3, 4 ],
  [ 3, 6.723154621172782 ],
  [ 3, 9.446309242345563 ],
  [ 3.9354486533919397, 12.387971226535829 ],
  [ 5.008151811686941, 14.890945262557498 ],
  [ 6.080854969981942, 17.393919298579167 ] ]

Install Dev Dependencies

$ npm install

Contributing

Please fork and pull request against upstream master on a feature branch. Please provide unit tests and script fixtures in the test directory.

Running Unit Tests

$ npm test

Continuous Integration

Travis tests every release against node version 0.10

Build Status