hi,
below is the code snippet for zooming the Diagram View.

// Jdiagram View
m_mainJDiagramView = new DiagramView();
m_mainJDiagramView.setLayout(new GridBagLayout());
*******************
m_mainJDiagramView.zoomToFit(new Rectangle2D.Double(50,50,50,50));
********************
m_mainDiagram = new Diagram();

m_mainDiagram.setBackBrush(new SolidBrush(new Color((int) 202,
(int) 202, (int) 202)));
m_mainDiagram.setSelectAfterCreate(false);
m_mainJDiagramView.setCursor(Cursor.getDefaultCursor());
m_mainDiagram.getUndoManager().setUndoEnabled(true);
m_mainDiagram.setGridColor(Color.black);
m_mainDiagram.setShowAnchors(ShowAnchors.Auto);
m_mainDiagram.setShowGrid(true);
m_mainDiagram.setAlignToGrid(true);
m_mainJDiagramView.setBehavior(Behavior.DrawLinks);
m_mainDiagram.setSnapToAnchor(SnapToAnchor.OnCreateOrModify);
m_mainDiagram.setShapeBrush(new SolidBrush(Color.LIGHT_GRAY));
m_mainDiagram.setMeasureUnit(GraphicsUnit.Millimeter);
m_mainDiagram.setBounds(new Rectangle2D.Float(0, 0, 380, 380));
m_mainDiagram.setAlignToGrid(true);

Node[] nodes = new Node[] {
new Node(new AnchorPattern(new AnchorPoint[] {
new AnchorPoint((short) 30, (short) 0, true, true,
MarkStyle.Circle, Color.red),
new AnchorPoint((short) 50, (short) 0, true, true,
MarkStyle.Circle, Color.red),
--
*
*
*
*
m_mainJDiagramView.setDiagram(m_mainDiagram);
// holds Jdiagram.
JideScrollPane jideJdiagramScrollPane = new JideScrollPane();

jideJdiagramScrollPane.setAutoscrolls(true);

jideJdiagramScrollPane.setBorder(lineBorder);

jideJdiagramScrollPane.getViewport().add(m_mainJDiagramView);
jideJdiagramScrollPane
.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
jideJdiagramScrollPane
.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
jideJdiagramScrollPane
.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);

Can you please help if i am wrong in implementing Zoom functionality.

regards
sandeep.