code: function(pixel, drawing) {
          if(!this.line) {
              this.createFeature(pixel);
          }
          var lonlat = this.layer.getLonLatFromViewPortPx(pixel); 
          this.point.geometry.x = lonlat.lon;
          this.point.geometry.y = lonlat.lat;
          this.callback("modify", [this.point.geometry, this.getSketch(), drawing]);
          this.point.geometry.clearBounds();
          this.drawFeature();
      }
docs: Method: modifyFeature
  Modify the existing geometry given the new point
  
  Parameters:
  pixel - {<OpenLayers.Pixel>} The updated pixel location for the latest
  point.
  drawing - {Boolean} Indicate if we're currently drawing.