NodeFigure.java example

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/*******************************************************************************
 * Copyright (c) 2006-2012
 * Software Technology Group, Dresden University of Technology
 * DevBoost GmbH, Berlin, Amtsgericht Charlottenburg, HRB 140026
 * 
 * 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:
 *   Software Technology Group - TU Dresden, Germany;
 *   DevBoost GmbH - Berlin, Germany
 *      - initial API and implementation
 ******************************************************************************/
/*
 * @(#)NodeFigure.java  1.0  July 4, 2006
 *
 * Copyright (c) 1996-2006 by the original authors of JHotDraw
 * and all its contributors.
 * All rights reserved.
 *
 * The copyright of this software is owned by the authors and  
 * contributors of the JHotDraw project ("the copyright holders").  
 * You may not use, copy or modify this software, except in  
 * accordance with the license agreement you entered into with  
 * the copyright holders. For details see accompanying license terms. 
 */
package org.jhotdraw.samples.net.figures;

import java.awt.geom.*;
import java.io.*;
import java.util.*;
import org.jhotdraw.draw.*;
import org.jhotdraw.geom.*;
import static org.jhotdraw.draw.AttributeKeys.*;
import org.jhotdraw.util.*;
import org.jhotdraw.xml.*;

/**
 * NodeFigure.
 *
 * @author Werner Randelshofer
 * @version 1.0 July 4, 2006 Created.
 */
public class NodeFigure extends TextFigure {

    private LinkedList<Connector> connectors;
    private static LocatorConnector north;
    private static LocatorConnector south;
    private static LocatorConnector east;
    private static LocatorConnector west;

    /** Creates a new instance. */
    public NodeFigure() {
        RectangleFigure rf = new RectangleFigure();
        setDecorator(rf);
        createConnectors();
        DECORATOR_INSETS.basicSet(this, new Insets2D.Double(6, 10, 6, 10));
        ResourceBundleUtil labels = ResourceBundleUtil.getBundle("org.jhotdraw.samples.net.Labels");
        setText(labels.getString("nodeDefaultName"));
        setAttributeEnabled(DECORATOR_INSETS, false);
    }

    private void createConnectors() {
        connectors = new LinkedList<Connector>();
        connectors.add(new LocatorConnector(this, RelativeLocator.north()));
        connectors.add(new LocatorConnector(this, RelativeLocator.east()));
        connectors.add(new LocatorConnector(this, RelativeLocator.west()));
        connectors.add(new LocatorConnector(this, RelativeLocator.south()));
    }

    @Override
    public Collection<Connector> getConnectors(ConnectionFigure prototype) {
        return (List<Connector>) Collections.unmodifiableList(connectors);
    }

    @Override
    public Collection<Handle> createHandles(int detailLevel) {
        java.util.List<Handle> handles = new LinkedList<Handle>();
        switch (detailLevel) {
            case -1:
                handles.add(new BoundsOutlineHandle(getDecorator(), false, true));
                break;
            case 0:
                handles.add(new MoveHandle(this, RelativeLocator.northWest()));
                handles.add(new MoveHandle(this, RelativeLocator.northEast()));
                handles.add(new MoveHandle(this, RelativeLocator.southWest()));
                handles.add(new MoveHandle(this, RelativeLocator.southEast()));
                for (Connector c : connectors) {
                    handles.add(new ConnectorHandle(c, new LineConnectionFigure()));
                }
                break;
        }
        return handles;
    }

    @Override
    public Rectangle2D.Double getFigureDrawingArea() {
        Rectangle2D.Double b = super.getFigureDrawingArea();
        // Grow for connectors
        Geom.grow(b, 10d, 10d);
        return b;
    }

    @Override
    public Connector findConnector(Point2D.Double p, ConnectionFigure figure) {
        // return closest connector
        double min = Double.MAX_VALUE;
        Connector closest = null;
        for (Connector c : connectors) {
            Point2D.Double p2 = Geom.center(c.getBounds());
            double d = Geom.length2(p.x, p.y, p2.x, p2.y);
            if (d < min) {
                min = d;
                closest = c;
            }
        }
        return closest;
    }

    @Override
    public Connector findCompatibleConnector(Connector c, boolean isStart) {
        if (c instanceof LocatorConnector) {
            LocatorConnector lc = (LocatorConnector) c;
            for (Connector cc : connectors) {
                LocatorConnector lcc = (LocatorConnector) cc;
                if (lcc.getLocator().equals(lc.getLocator())) {
                    return lcc;
                }
            }
        }
        return connectors.getFirst();
    }

    @Override
    public NodeFigure clone() {
        NodeFigure that = (NodeFigure) super.clone();
        that.createConnectors();
        return that;
    }

    @Override
    public int getLayer() {
        return -1; // stay below ConnectionFigures
    }

    @Override
    protected void writeDecorator(DOMOutput out) throws IOException {
        // do nothing
    }

    @Override
    protected void readDecorator(DOMInput in) throws IOException {
        // do nothing
    }

    @Override
    public <T> void setAttribute(AttributeKey<T> key, T newValue) {
        super.setAttribute(key, newValue);
        if (getDecorator() != null) {
            key.basicSet(getDecorator(), newValue);
        }
    }
}