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/*
* Copyright (c) 2008-2011, Piccolo2D project, http://piccolo2d.org
* Copyright (c) 1998-2008, University of Maryland
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided
* that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this list of conditions
* and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice, this list of conditions
* and the following disclaimer in the documentation and/or other materials provided with the
* distribution.
*
* None of the name of the University of Maryland, the name of the Piccolo2D project, or the names of its
* contributors may be used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.piccolo2d.examples;
import java.awt.Color;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.Random;
import org.piccolo2d.PCanvas;
import org.piccolo2d.PLayer;
import org.piccolo2d.PNode;
import org.piccolo2d.event.PDragSequenceEventHandler;
import org.piccolo2d.event.PInputEvent;
import org.piccolo2d.extras.PFrame;
import org.piccolo2d.nodes.PPath;
/**
* Create a simple graph with some random nodes and connected edges. An event
* handler allows users to drag nodes around, keeping the edges connected.
*
* ported from .NET GraphEditorExample by Sun Hongmei.
*/
public class GraphEditorExample extends PFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
public GraphEditorExample() {
this(null);
}
public GraphEditorExample(final PCanvas aCanvas) {
super("GraphEditorExample", false, aCanvas);
}
public void initialize() {
final int numNodes = 50;
final int numEdges = 50;
// Initialize, and create a layer for the edges (always underneath the
// nodes)
final PLayer nodeLayer = getCanvas().getLayer();
final PLayer edgeLayer = new PLayer();
getCanvas().getCamera().addLayer(0, edgeLayer);
final Random rnd = new Random();
ArrayList tmp;
for (int i = 0; i < numNodes; i++) {
final float x = (float) (300. * rnd.nextDouble());
final float y = (float) (400. * rnd.nextDouble());
final PPath path = PPath.createEllipse(x, y, 20, 20);
tmp = new ArrayList();
path.addAttribute("edges", tmp);
nodeLayer.addChild(path);
}
// Create some random edges
// Each edge's Tag has an ArrayList used to store associated nodes
for (int i = 0; i < numEdges; i++) {
final int n1 = rnd.nextInt(numNodes);
final int n2 = rnd.nextInt(numNodes);
final PNode node1 = nodeLayer.getChild(n1);
final PNode node2 = nodeLayer.getChild(n2);
final Point2D.Double bound1 = (Point2D.Double) node1.getBounds().getCenter2D();
final Point2D.Double bound2 = (Point2D.Double) node2.getBounds().getCenter2D();
final PPath edge = new PPath.Float();
edge.moveTo((float) bound1.getX(), (float) bound1.getY());
edge.lineTo((float) bound2.getX(), (float) bound2.getY());
tmp = (ArrayList) node1.getAttribute("edges");
tmp.add(edge);
tmp = (ArrayList) node2.getAttribute("edges");
tmp.add(edge);
tmp = new ArrayList();
tmp.add(node1);
tmp.add(node2);
edge.addAttribute("nodes", tmp);
edgeLayer.addChild(edge);
}
// Create event handler to move nodes and update edges
nodeLayer.addInputEventListener(new NodeDragHandler());
}
public static void main(final String[] args) {
new GraphEditorExample();
}
// TODO eclipse formatter made this ugly
// /
// / Simple event handler which applies the following actions to every node
// it is called on:
// / * Turn node red when the mouse goes over the node
// / * Turn node white when the mouse exits the node
// / * Drag the node, and associated edges on mousedrag
// / It assumes that the node's Tag references an ArrayList with a list of
// associated
// / edges where each edge is a PPath which each have a Tag that references
// an ArrayList
// / with a list of associated nodes.
// /
class NodeDragHandler extends PDragSequenceEventHandler {
public NodeDragHandler() {
getEventFilter().setMarksAcceptedEventsAsHandled(true);
}
public void mouseEntered(final PInputEvent e) {
if (e.getButton() == 0) {
e.getPickedNode().setPaint(Color.red);
}
}
public void mouseExited(final PInputEvent e) {
if (e.getButton() == 0) {
e.getPickedNode().setPaint(Color.white);
}
}
public void drag(final PInputEvent e) {
final PNode node = e.getPickedNode();
node.translate(e.getDelta().width, e.getDelta().height);
final ArrayList edges = (ArrayList) e.getPickedNode().getAttribute("edges");
int i;
for (i = 0; i < edges.size(); i++) {
final PPath edge = (PPath) edges.get(i);
final ArrayList nodes = (ArrayList) edge.getAttribute("nodes");
final PNode node1 = (PNode) nodes.get(0);
final PNode node2 = (PNode) nodes.get(1);
edge.reset();
// Note that the node's "FullBounds" must be used (instead of
// just the "Bound") because the nodes have non-identity
// transforms which must be included when determining their
// position.
final Point2D.Double bound1 = (Point2D.Double) node1.getFullBounds().getCenter2D();
final Point2D.Double bound2 = (Point2D.Double) node2.getFullBounds().getCenter2D();
edge.moveTo((float) bound1.getX(), (float) bound1.getY());
edge.lineTo((float) bound2.getX(), (float) bound2.getY());
}
}
}
}
