Javascript OpenLayers 3在功能添加事件上绘制交互

在OL2中，我能够做到以下几点：

var drawControl = new ol.Control.DrawFeature(
    myLayer,
    ol.Handler.RegularPolygon, {
        handlerOptions: {
            sides: 4,
            irregular: true
        },
        eventListeners: {
            featureadded: function( e ) {
                // process features
            }
        }
    }
);

在OL3中添加功能后，是否有办法访问这些功能？我试图做的是在绘制特征后投影它们。理想情况下，如果可能的话，我会在画它们之前投影它们

// draw is an instance of ol.interaction.Draw
// when draw ended but the feature was not added yet to ol.source.Vector
draw.on('drawend', function(evt){
  console.info(evt.feature);
});

// vectorSource is an instance of ol.source.Vector
// added to source
vectorSource.on('addfeature', function(evt) {
    console.info(evt.feature);
});