code: public void onMouseUp(MouseUpEvent event) {
  		if (event.getNativeButton() != NativeEvent.BUTTON_RIGHT) {
  			Coordinate coordinate = getWorldPosition(event);
  			if (distanceLine.getOriginalLocation() == null) {
  				distanceLine.setGeometry(getFactory().createLineString(new Coordinate[] { coordinate }));
  				mapWidget.registerWorldPaintable(distanceLine);
  				mapWidget.registerWorldPaintable(lineSegment);
  				dispatchState(State.START);
  			} else {
  				Geometry geometry = (Geometry) distanceLine.getOriginalLocation();
  				InsertCoordinateOperation op = new InsertCoordinateOperation(geometry.getNumPoints(), coordinate);
  				geometry = op.execute(geometry);
  				distanceLine.setGeometry(geometry);
  				tempLength = (float) geometry.getLength();
  				updateMeasure(event, true);
  				dispatchState(State.CLICK);
  			}
  			mapWidget.render(mapWidget.getMapModel(), RenderGroup.VECTOR, RenderStatus.UPDATE);
  		}
  	}
docs: Set a new point on the distance-line.