1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.g2d.elementclass.canvas;
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14 import java.awt.geom.AffineTransform;
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15 import java.awt.geom.Rectangle2D;
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17 import org.simantics.g2d.element.ElementUtils;
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18 import org.simantics.g2d.element.IElement;
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19 import org.simantics.g2d.element.handler.SceneGraph;
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20 import org.simantics.scenegraph.g2d.G2DParentNode;
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21 import org.simantics.scenegraph.utils.GeometryUtils;
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22 import org.simantics.utils.datastructures.hints.IHintContext.Key;
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23 import org.simantics.utils.datastructures.hints.IHintContext.KeyOf;
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24 import org.simantics.utils.page.MarginUtils;
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25 import org.simantics.utils.page.MarginUtils.Margins;
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28 * Lock viewport (KEY_VIEWPORT) of DiagramPainter to an element.
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30 * e.setHint(DiagramHints.KEY_DIAGRAM, ElementUtils.getDiagram(focusE)); Note!
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31 * Add this handler _before_ diagram painter in element class
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33 * Keys: ElementViewport.KEY_ELEMENT
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35 * @See {@link DiagramPainter}
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36 * @author Toni Kalajainen
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38 public class ElementViewport implements SceneGraph {
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40 public static final Key KEY_ELEMENT = new KeyOf(IElement.class);
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42 private static final long serialVersionUID = -849879952227051310L;
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44 public static final ElementViewport INSTANCE = new ElementViewport();
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46 private final Margins margins = MarginUtils.MARGINS5;
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49 public void cleanup(IElement e) {
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53 public void init(IElement e, G2DParentNode parent) {
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54 // Initializes viewport before DiagramPainter initializes the
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56 IElement focusE = e.getHint(KEY_ELEMENT);
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57 Rectangle2D focusBounds = ElementUtils.getElementBounds(focusE);
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58 Rectangle2D bounds = ElementUtils.getElementBounds(e);
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60 AffineTransform at = GeometryUtils.fitArea(bounds, focusBounds, margins);
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61 e.setHint(DiagramPainter.KEY_VIEWPORT, at);
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