Awesome
lineclip
A very fast JavaScript library for clipping polylines and polygons by a bounding box.
- uses Cohen-Sutherland algorithm for line clipping
- uses Sutherland-Hodgman algorithm for polygon clipping
lineclip(
[[-10, 10], [10, 10], [10, -10]], // line
[0, 0, 20, 20]); // bbox
// returns [[[0, 10], [10, 10], [10, 0]]]
API
lineclip.polyline(points, bbox[, result])
points
— an array of[x, y]
pointsbbox
— a bounding box as[xmin, ymin, xmax, ymax]
result
— an array to append the results to
Returns an array of clipped lines.
lineclip
is an alias to lineclip.polyline
.
lineclip.polygon(points, bbox)
Returns a clipped polygon.
Install
Install with NPM:
npm install lineclip
To build a browser-compatible version, clone the repository locally, then run:
npm install -g browserify
browserify -s lineclip index.js > lineclip.js
Changelog
1.1.5 (Sep 23, 2015)
- Fixed a bug where polygon clip broke on out-of-bbox polygons.
1.1.4 (Sep 22, 2015)
- Fixed a bug where last point was omitted if the last two points are in bbox.
- Fixed a bug where a line outside of bbox would produce
[[]]
instead of[]
.
1.1.3 (Sep 12, 2015)
- Fixed a polygon clipping race condition.
1.1.2 (Sep 11, 2015)
- Fixed a bug that completely broke the clipping on many cases. Sorry!
1.1.1 (Sep 11, 2015)
- Fixed a polyline clipping edge case.
1.1.0 (Sep 11, 2015)
- Added Sutherland-Hodgeman polygon clipping (
lineclip.polygon
).
1.0.1 (Sep 11, 2015)
- Minor code cleanup and optimizations.
1.0.0 (Sep 8, 2015)
- Initial release.