OL3 check if point is inside a polygon

Question

When I am adding a point to my web map I want to give it a letter that represents the area where the point is, so I need to know what area the point is in. In OpenLayers 2 I did it like this: areas[i].geometry.containsPoint(point) ---> returns true if it does.

Is there anything like this in OL3?

I searched in the OL3 API but didn't find it.

Answer 1

You can use yourVectorLayer.getSource().getFeaturesAtCoordinate(point). The result is an array, if its length > 0 then the point is inside, otherwise it's not.

Answer 2

These kind of operations aren't supported out of the box in ol3. (maybe in the future).

But you can use a library like http://turfjs.org , in this case you'll need https://github.com/Turfjs/turf-within or https://github.com/Turfjs/turf-inside

You can use ol.format.GeoJSON to convert from a ol3-geometry and geojson for turf and back.

Answer 3

The latest version as of writing is 3.16.0, has the API: ol.extent.containsXY(extent, x, y)

See more info in the latest API docs