A library to perform point-in-geofence searches. A tiled cache is used to determine inclusion very efficiently, so the library is tailored for create once, query many times uses.
Geofence.inside() should be faster than utils.pointInPolygon: iterations: 1000000, innout: 48ms, pointinpolygon: 747ms
npm install in-n-out
Geofence(vertices, granularity = 20)
Using the Geofence class you can determine whether a point is inside the geofence or not. Upon construction, the geofence's bounding box is broken down into tiles. The tiles that either intersect or are inside the geofence are tracked in a hash table.
Geofence.inside() queries then use this cache to quickly answer
var InNOut = require('in-n-out'); var gf = new InNOut.Geofence([[0,0], [1,0], [1,1], [0,1], [0,0]], 100); gf.inside([0.5,0.5]); // true gf.inside([100,100]); // false
Just like GeoJSON supports interior rings
for polygons, the
Geofence class may also be passed multiple sets of
vertices. If you do, the first set is taken to be the exterior ring, and all
subsequent sets are taken as interior rings ("holes").
The geofence's bbox will be broken down into a granularity x granylarity grid, defaulting to 20x20.
GeofencedGroup(id, whiteoutGfs, blackoutGfs)
Used to determine which ids are valid for a given location, based on the whiteout and blackout geofence rules provided for each id. A typical use case is geofence triggers for loccations, offering location based services or denying services based on location.
var InNOut = require('in-n-out'); var whiteoutGf = new InNOut.Geofence([[0,0], [1,0], [1,1], [0,1], [0,0]]); var blackoutGf = new InNOut.Geofence([[0.5,0], [1,0], [1,1], [0.5,1], [0.5, 0]]); var gfGroup = new InNOut.GeofencedGroup(); gfGroup.add(1, [whiteoutGf], [blackoutGf]); gfGroup.getValidKeys([0.1, 0.1]); //  - Included by whiteout gfGroup.getValidKeys([0.6, 0.6]); //  - Excluded by blackout gfGroup.getValidKeys([100, 100]); //  - Excluded by whiteout
The inclusion logic is as follows:
- If there are blackout zones, exclude the point if it is inside any of them
- If there are whiteout zones
- Include the point if it is inside of any of them
- Exclude the point otherwise
- Include the point
Passing null for the geofence arrays is the same as
This provides a relatively primitive caching mechanism which allows you to bypass tile creation for identical geofences. It's basically a drop-in replacement for
new Geofence(). It keeps all geofences around so if you use many of them you'll run out of memory.
var geofenceCache = new GeofenceCache(); var geo = geofenceCache.getGeo([[0,0], [1,0], [1,1], [0,1], [0,0]];
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