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diff --git a/bundles/org.simantics.g2d/src/org/simantics/g2d/elementclass/canvas/ElementViewport.java b/bundles/org.simantics.g2d/src/org/simantics/g2d/elementclass/canvas/ElementViewport.java
new file mode 100644
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+++ b/bundles/org.simantics.g2d/src/org/simantics/g2d/elementclass/canvas/ElementViewport.java
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+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.g2d.elementclass.canvas;
+
+import java.awt.geom.AffineTransform;
+import java.awt.geom.Rectangle2D;
+
+import org.simantics.g2d.element.ElementUtils;
+import org.simantics.g2d.element.IElement;
+import org.simantics.g2d.element.handler.SceneGraph;
+import org.simantics.scenegraph.g2d.G2DParentNode;
+import org.simantics.scenegraph.utils.GeometryUtils;
+import org.simantics.utils.datastructures.hints.IHintContext.Key;
+import org.simantics.utils.datastructures.hints.IHintContext.KeyOf;
+import org.simantics.utils.page.MarginUtils;
+import org.simantics.utils.page.MarginUtils.Margins;
+
+/**
+ * Lock viewport (KEY_VIEWPORT) of DiagramPainter to an element.
+ * 
+ * e.setHint(DiagramHints.KEY_DIAGRAM, ElementUtils.getDiagram(focusE)); Note!
+ * Add this handler _before_ diagram painter in element class
+ * 
+ * Keys: ElementViewport.KEY_ELEMENT
+ * 
+ * @See {@link DiagramPainter}
+ * @author Toni Kalajainen
+ */
+public class ElementViewport implements SceneGraph {
+
+    public static final Key             KEY_ELEMENT      = new KeyOf(IElement.class);
+
+    private static final long           serialVersionUID = -849879952227051310L;
+
+    public static final ElementViewport INSTANCE         = new ElementViewport();
+
+    private final Margins               margins          = MarginUtils.MARGINS5;
+
+    @Override
+    public void cleanup(IElement e) {
+    }
+
+    @Override
+    public void init(IElement e, G2DParentNode parent) {
+        // Initializes viewport before DiagramPainter initializes the
+        // scenegraph.
+        IElement focusE = e.getHint(KEY_ELEMENT);
+        Rectangle2D focusBounds = ElementUtils.getElementBounds(focusE);
+        Rectangle2D bounds = ElementUtils.getElementBounds(e);
+
+        AffineTransform at = GeometryUtils.fitArea(bounds, focusBounds, margins);
+        e.setHint(DiagramPainter.KEY_VIEWPORT, at);
+    }
+
+}