How to use

addNode

method

in

org.jhotdraw.draw.BezierFigure

/**
 * Adds a control point.
 */
public void addNode(BezierPath.Node p) {
  addNode(getNodeCount(), p);
}

/**
 * Splits the segment at the given Point2D.Double if a segment was hit.
 * @return the index of the segment or -1 if no segment was hit.
 *
 * @param split a Point on (or near) a line segment on the bezier path
 * @param tolerance a tolerance, tolerance should take into account
 * the line width, plus 2 divided by the zoom factor. 
 */
public int splitSegment(Point2D.Double split, double tolerance) {
  int i = findSegment(split, tolerance);
  if (i != -1) {
    addNode(i + 1, new BezierPath.Node(split));
  }
  return i + 1;
}

/**
 * Convenience method for setting the point coordinate of the start point.
 * If the BezierFigure has not at least two nodes, nodes are added
 * to the figure until the BezierFigure has at least two nodes.
 */
public void setStartPoint(Point2D.Double p) {
  // Add two nodes if we haven't at least two nodes
  for (int i = getNodeCount(); i < 2; i++) {
    addNode(0, new BezierPath.Node(p.x, p.y));
  }
  setPoint(0, p);
}

@Override
public void redo() throws CannotRedoException {
  super.redo();
  willChange();
  addNode(index, newNode);
  changed();
}

/**
 * Convenience method for setting the point coordinate of the end point.
 * If the BezierFigure has not at least two nodes, nodes are added
 * to the figure until the BezierFigure has at least two nodes.
 */
public void setEndPoint(Point2D.Double p) {
  // Add two nodes if we haven't at least two nodes
  for (int i = getNodeCount(); i < 2; i++) {
    addNode(0, new BezierPath.Node(p.x, p.y));
  }
  setPoint(getNodeCount() - 1, p);
}

  @Override
  public void undo() throws CannotUndoException {
    super.undo();
    view.removeFromSelection(f);
    f.willChange();
    f.addNode(index, removedNode);
    f.changed();
    view.addToSelection(f);
  }
});

  @Override
  public void undo() throws CannotUndoException {
    super.undo();
    view.removeFromSelection(f);
    f.willChange();
    f.addNode(index, removedNode);
    f.changed();
    view.addToSelection(f);
  }
});

@Override
public void updateFigure(final OverlayView view, final BezierFigure figure) {
  super.updateFigure(view, figure);
  assert view.getData() instanceof GeneralPathOverlay;
  final GeneralPathOverlay gpo = (GeneralPathOverlay) view.getData();
  final GeneralPathRegionOfInterest gpr = gpo.getRegionOfInterest();
  final PathIterator pi = gpr.getGeneralPath().getPathIterator(null);
  final int nCount = figure.getNodeCount();
  int i = 0;
  final double[] pos = new double[6];
  while (!pi.isDone()) {
    pi.currentSegment(pos);
    final Node n = new Node(pos[0], pos[1]);
    if (i < nCount) figure.getNode(i).setTo(n);
    else figure.addNode(n);
    pi.next();
    i++;
  }
  while (i < figure.getNodeCount())
    figure.removeNode(i);
}

protected void addPointToFigure(Point2D.Double newPoint) {
  int pointCount = createdFigure.getNodeCount();
  createdFigure.willChange();
  if (pointCount < 2) {
    createdFigure.addNode(new BezierPath.Node(newPoint));
  } else {
    Point2D.Double endPoint = createdFigure.getEndPoint();
    Point2D.Double secondLastPoint = (pointCount <= 1) ? endPoint : createdFigure.getPoint(pointCount - 2, 0);
    if (newPoint.equals(endPoint)) {
      // nothing to do
    } else if (pointCount > 1 && Geom.lineContainsPoint(newPoint.x, newPoint.y, secondLastPoint.x, secondLastPoint.y, endPoint.x, endPoint.y, 0.9f / getView().getScaleFactor())) {
      createdFigure.setPoint(pointCount - 1, 0, newPoint);
    } else {
      createdFigure.addNode(new BezierPath.Node(newPoint));
    }
  }
  createdFigure.changed();
}

@Override
public void updateFigure(final OverlayView view, final BezierFigure figure) {
  super.updateFigure(view, figure);
  final PolygonOverlay polygonOverlay = downcastOverlay(view.getData());
  final PolygonRegionOfInterest roi = polygonOverlay.getRegionOfInterest();
  final int vertexCount = roi.getVertexCount();
  while (figure.getNodeCount() > vertexCount) {
    figure.removeNode(vertexCount);
  }
  for (int i = 0; i < vertexCount; i++) {
    final RealLocalizable vertex = roi.getVertex(i);
    final double x = vertex.getDoublePosition(0);
    final double y = vertex.getDoublePosition(1);
    if (figure.getNodeCount() == i) {
      figure.addNode(new Node(x, y));
    }
    else {
      final Node node = figure.getNode(i);
      node.mask = 0;
      Arrays.fill(node.x, x);
      Arrays.fill(node.y, y);
    }
  }
}

createdFigure.addNode(new BezierPath.Node(
    creationView.getConstrainer().constrainPoint(
    creationView.viewToDrawing(anchor))));