code: function(point, geometry) {
          this.cancelDelay();
          geometry = geometry.clone();
          // when we're wating for a dblclick, we have to trigger measurepartial
          // after some delay to deal with reflow issues in IE
          if (this.handler.freehandMode(this.handler.evt)) {
              // no dblclick in freehand mode
              this.measure(geometry, "measurepartial");
          } else {
              this.delayedTrigger = window.setTimeout(
                  OpenLayers.Function.bind(function() {
                      this.delayedTrigger = null;
                      this.measure(geometry, "measurepartial");
                  }, this),
                  this.partialDelay
              );
          }
      }
docs: Method: measurePartial
  Called each time a new point is added to the measurement sketch.
  
  Parameters:
  point - {<OpenLayers.Geometry.Point>} The last point added.
  geometry - {<OpenLayers.Geometry>} The sketch geometry.