#L.MeasureAreaControl Simple Leaflet control for measuring element's area. Check the demo.

Implements [GeometryUtil.js] (https://github.com/Leaflet/Leaflet.draw/blob/master/src/ext/GeometryUtil.js) by [Leaflet.draw] (https://github.com/Leaflet/Leaflet.draw)

Requirements

• Leaflet 0.7.3
• Font-awesome 4.1.0

Cross-browser compatibility

Tested on:

• IE8, IE9, IE10
• Mozilla 30 (linux)
• Mozilla 29.0.1 (win)
• Chrome 35.0.1916.153 (linux)
• Chrome 35.0.1916.153 (Win)

API

####Constructor

Constructor	Description
L.Control.measureAreaControl(Object options, Array layers[]);	Accepts options object and array of layers of different types
L.Control.measureAreaControl(Object options);	Accepts options object
L.Control.measureAreaControl();	Uses default options

The constructor accepts options object, just like L.Control does. For more details about options see below. Second parameter is an array of layers of class [L.Polygon] (http://leafletjs.com/reference.html#polygon)/[L.Rectangle] (http://leafletjs.com/reference.html#rectangle) and [L.LayerGroup] (http://leafletjs.com/reference.html#layergroup) as well as all its children ([L.FeatureGroup] (http://leafletjs.com/reference.html#featuregroup) and [L.GeoJson] (http://leafletjs.com/reference.html#geojson), consisting of L.Polygon or L.Rectangle. [L.Circle] (http://leafletjs.com/reference.html#circle) and [L.CircleMarker] (http://leafletjs.com/reference.html#circlemarker) are NOT supported!

####Options

Property	Type	Default	Description
position	String	'topright'	The position of the control. More [here] (http://leafletjs.com/reference.html#control-positions).
geodesic	Boolean	true	If true, returns value in square meters. Else, returns hectares

####Methods

method	Param	Description
addLayer(layer)	layers of different types (see note)	accepts layers not in array
removeLayer(layer)	layers of different types (see note)	accepts layers not in array

Accepts same types of layers as constructor, but not as an array, but as single objects. L.Circle is NOT suported.

####Usage

Initialize tool and pass layers to constructor:

   // adding test data
   var geojson1 = L.geoJson(JSON.parse(data1),opts1).addTo(map);
   var geojson2= L.geoJson(JSON.parse(data2),opts2).addTo(map);
   
   // setting options 
   var options = {geodesic: true};
      
   //input parameter is Array of layers
   var layers = [geojson1, geojson2];
   
   // initialize control
   var control = L.Control.measureAreaControl(options, layers).addTo(map);

You can add or remove layers also later:

   var polygon = L.polygon([
        [48.10804729138659, 17.106292247772217],
        [48.10853443729303, 17.106292247772217],
        [48.10853443729303, 17.1071720123291],
        [48.10804729138659, 17.1071720123291],
        [48.10804729138659, 17.106292247772217]
    ]).addTo(_map);
    control.addLayer(polygon);
   // control.removeLayer(polygon);

####Package instruction

1. download and unpack repo
2. cd repo
3. sudo npm install
4. grunt install

...and you are up and running.

####TODO Feel free to propose, report or whatever.

###Thanks

Thanks to guys from [Leaflet.draw] (https://github.com/Leaflet/Leaflet.draw) for inspiration.