Leaflet AreaSelect
AreaSelect is a leaflet plugin for letting users select a square area (bounding box), using a resizable centered box on top of the map.
Another similar plugin is leaflet-locationfilter, which solves the same problem but provides a rectangle that is movable and not fixed to the center, but doesn't support keeping the aspect ratio.
Example Code
// Add it to the map
var areaSelect = L.areaSelect({width:200, height:300, minWidth:40, minHeight:40, minHorizontalSpacing:40, minVerticalSpacing:100});
areaSelect.addTo(map);
// Read the bouding box
var bounds = areaSelect.getBounds();
// Get a callback when the bounds change
areaSelect.on("change", function() {
console.log("Bounds:", this.getBounds());
});
// Set the dimensions of the box
areaSelect.setDimensions({width: 500, height: 500})
// And to remove it do:
//areaSelect.remove();You can also make it keep the aspect ratio:
var areaSelect = L.areaSelect({width:200, height:300, keepAspectRatio:true});If you need the coordinates for all four corners of the bounding box:
var bboxCoordinates = areaSelect.getBBoxCoordinates();See it in action
Check out the bundled example, or this JSFiddle where I've set keepAspectRatio:true.
Author
AreaSelect is developed by Jonatan Heyman.
License
MIT License