leaflet-lasso


Lasso selection plugin for Leaflet

Demo

Supports all Leaflet vector layers:

- Marker
- CircleMarker
- Circle
- Polyline
- Polyline with multiple segments
- Rectangle
- Polygon
- Polygon with hole
- Polygon with multiple segments
- Polygon with multiple segments and holes
- Custom layers can be supported if they inherit from the above layers, and have getBounds and toGeoJSON methods

Selection modes:

- contain - entire shape must be in lasso polygon (default)
- intersect - any part of shape can be in lasso polygon

Install

``
npm install leaflet-lasso
`

or

`

`

Usage

`
import "leaflet-lasso";
`

For detailed API, please see exported TypeScript typings.

$3

Use for custom activation.

`
interface LassoHandlerOptions {
polygon?: L.PolylineOptions,
intersect?: boolean;
}
`

`
const lasso = L.lasso(map, options);
yourCustomButton.addEventListener('click', () => {
lasso.enable();
});
`

$3

Use for default control.

`
interface LassoControlOptionsData {
title?: string;
}

type LassoControlOptions = L.ControlOptions & LassoControlOptionsData & LassoHandlerOptions;
`

`
L.control.lasso(options).addTo(map);
`

$3

Listen for this event to receive matching Leaflet layers.

`
interface LassoHandlerFinishedEventData {
originalEvent: MouseEvent;
latLngs: L.LatLng[];
layers: L.Layer[];
}

type LassoHandlerFinishedEvent = L.LeafletEvent & LassoHandlerFinishedEventData;
`

`
map.on('lasso.finished', (event: LassoHandlerFinishedEvent) => {
console.log(event.layers);
});
``

Thanks

Icon by @Falke-Design