geospatial - OpenLayers 3 get WKT Polygon string -

i have openlayers 3 map can draw polygon.

i have returned wkt string rapresent drawed polygon.

how can it?

jsfiddle code http://jsfiddle.net/michelejs/3zawt33b/7/

here map:

map = new ol.map({             target: 'map',             layers: [raster,vector],             view: new ol.view({               center: ol.proj.fromlonlat([11.249367, 43.774298]),               zoom: 15             })         }); 

here intaractions me draw polygon:

function addinteraction() {          var ct = 0;         draw = new ol.interaction.draw({             source: source,             type: 'polygon',             geometryfunction: function (c, g) {                 if (goog.isdef(g)) {                     g.setcoordinates(c);                 } else {                     g = new ol.geom.polygon(c);                 }                 if (c[0].length > ct) {                     console.log('click coord : ' + c[0][c[0].length - 1]);                     var coord = c[0][c[0].length - 1];                     $('div#coordinate').html( $('div#coordinate').html() + "<p>" + ( number(coord[0]).tofixed(2) ) + " - " + ( number(coord[1]).tofixed(2) ) + "</p>" );                 coordinates.push(coord);                     ct = c[0].length;                 } else {                     console.log('move coord : ' + c[0][c[0].length - 1]);                  }                  return g;             }         });         draw.on('drawend',  function(e) {             isin = e;             checkifin();             lastfeature = e.feature;            //write wkt polygon code in div#getaswk         })          draw.on('drawstart', function (e) {             source.clear();         });           map.addinteraction(draw);      }    map.addinteraction(draw); 

ol3 contains ol.format.wkt class purpose. use writegeometry() method this:

var format = new ol.format.wkt(),     wkt = format.writegeometry(yourfeature.getgeometry()); 

see api-docs: http://openlayers.org/en/v3.0.0/apidoc/ol.format.wkt.html#writegeometry

fiddle: http://jsfiddle.net/igor23/3zawt33b/9/