code: function(point, feature, drawing) {
          if (drawing && !this.handler.freehandMode(this.handler.evt)) {
              this.cancelDelay();
              this.measure(feature.geometry, "measurepartial");
          }
      }
docs: Method: measureImmediate
  Called each time the measurement sketch is modified.
  
  Parameters:
  point - {<OpenLayers.Geometry.Point>} The point at the mouse position.
  feature - {<OpenLayers.Feature.Vector>} The sketch feature.
  drawing - {Boolean} Indicates whether we're currently drawing.