Source Code Cross Referenced for JGraphpadMorphingManager.java in  » Graphic-Library » jgraphpad » com » jgraph » pad » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Graphic Library » jgraphpad » com.jgraph.pad.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: JGraphpadMorphingManager.java,v 1.5 2007/03/25 13:11:08 david Exp $
003:         * Copyright (c) 2001-2005, Gaudenz Alder
004:         * 
005:         * All rights reserved. 
006:         * 
007:         * This file is licensed under the JGraph software license, a copy of which
008:         * will have been provided to you in the file LICENSE at the root of your
009:         * installation directory. If you are unable to locate this file please
010:         * contact JGraph sales for another copy.
011:         */
012:        package com.jgraph.pad.util;
013:
014:        import java.awt.Shape;
015:        import java.awt.event.ActionEvent;
016:        import java.awt.event.ActionListener;
017:        import java.awt.geom.Rectangle2D;
018:        import java.util.HashSet;
019:        import java.util.Hashtable;
020:        import java.util.Iterator;
021:        import java.util.Map;
022:
023:        import javax.swing.Timer;
024:
025:        import org.jgraph.JGraph;
026:        import org.jgraph.graph.CellView;
027:        import org.jgraph.graph.DefaultGraphModel;
028:        import org.jgraph.graph.GraphConstants;
029:
030:        /**
031:         * Animation for simple graph changes (moves). This takes a nested map and
032:         * animates the change visually so the vertices appear to float to their new
033:         * locations. This implementation only takes into account new positions of
034:         * vertices, sizes, colors etc are changed after the animation in a single step.<br>
035:         * Note: This class is not thread-safe.
036:         */
037:        public class JGraphpadMorphingManager implements  ActionListener {
038:
039:            /**
040:             * Specifies the delay between morphing steps in milliseconds. Default is
041:             * 30.
042:             */
043:            protected int delay = 30;
044:
045:            /**
046:             * Specifies the number of animation steps. Default is 10.
047:             */
048:            protected int steps = 10;
049:
050:            /**
051:             * References the graph to be morphed.
052:             */
053:            protected JGraph graph;
054:
055:            /**
056:             * Holds the current morhing step.
057:             */
058:            protected transient int step = 0;
059:
060:            /**
061:             * Holds the current and final bounds of the animation.
062:             */
063:            protected transient Map oldBounds = new Hashtable(),
064:                    newBounds = new Hashtable();
065:
066:            /**
067:             * Holds the context cells, eg the edges connected to the animated cells or
068:             * one of their parents.
069:             */
070:            protected transient CellView[] context;
071:
072:            /**
073:             * Holds the clipping shape to be used for repainting the graph.
074:             */
075:            protected transient Shape clip;
076:
077:            /**
078:             * Holds the original nested map for the final execute step.
079:             */
080:            protected transient Map nestedMap;
081:
082:            /**
083:             * Animates the graph so that all vertices move from their current location
084:             * to the new location stored in the nested map. This sets the
085:             * {@link #nestedMap} and {@link #graph} variable and spawns a timer
086:             * process. While the timer is running, further method calls are ignored.
087:             * The call will return immediately.
088:             * 
089:             * @param nestedMap
090:             *            The nested map that defines the new locations.
091:             */
092:            public synchronized void morph(JGraph graph, Map nestedMap) {
093:                if (this .graph == null && this .nestedMap == null
094:                        && graph != null && nestedMap != null) {
095:                    this .graph = graph;
096:                    this .nestedMap = nestedMap;
097:                    initialize();
098:                    // Execute the morphing. This spawns a timer
099:                    // to not block the dispatcher thread (repaint).
100:                    if (!newBounds.isEmpty()) {
101:                        Timer timer = new Timer(delay, this );
102:                        timer.start();
103:                    } else {
104:                        execute();
105:                    }
106:                }
107:            }
108:
109:            /**
110:             * Hook for subclassers to determine whether the specified cell should be
111:             * animated. This implementation returns true for all cells.
112:             * 
113:             * @param cell
114:             *            The cells to be checked.
115:             * @return Returns true if the cell may be animated.
116:             */
117:            protected boolean isAnimatable(Object cell) {
118:                return true;
119:            }
120:
121:            /**
122:             * Initializes the datastructures required for the animation. This
123:             * implementation sets the current and final location for the cells to be
124:             * animated using the specified nestedMap to get the new locations. If a
125:             * cell is in the nested map but {@link #isAnimatable(Object)} returns false
126:             * then the cell is moved to it's final location in the first animation
127:             * step.
128:             */
129:            protected void initialize() {
130:                // Initialize the old (current) and new (final) bounds
131:                // hashtables if the bounds differ. For the non-animatable
132:                // cells this will temporily apply the new bounds.
133:                Iterator it = nestedMap.entrySet().iterator();
134:                while (it.hasNext()) {
135:                    Map.Entry entry = (Map.Entry) it.next();
136:                    Object cell = entry.getKey();
137:                    Rectangle2D rect = GraphConstants.getBounds((Map) entry
138:                            .getValue());
139:                    if (rect != null) {
140:                        Rectangle2D old = graph.getCellBounds(cell);
141:                        if (old != null && !old.equals(rect)) {
142:                            oldBounds.put(cell, old.clone());
143:                            if (!isAnimatable(cell))
144:                                setCellBounds(cell, rect);
145:                            else
146:                                newBounds.put(cell, rect);
147:                        }
148:                    }
149:                }
150:
151:                // Finds the set of parents to determine the clipping region
152:                // and context of the animation. To make sure the complete
153:                // graph is painted including the non-animatable cells
154:                // this uses the cells from the oldbounds map.
155:                HashSet parents = new HashSet();
156:                it = oldBounds.keySet().iterator();
157:                while (it.hasNext()) {
158:                    Object cell = it.next();
159:
160:                    // Fetches all parents of the cell and adds them to the parent set
161:                    Object parent = graph.getModel().getParent(cell);
162:                    while (parent != null) {
163:                        parents.add(parent);
164:                        parent = graph.getModel().getParent(parent);
165:                    }
166:                }
167:                parents.addAll(oldBounds.keySet());
168:                Object[] cells = parents.toArray();
169:
170:                // Initializes the clipping region
171:                clip = graph.getCellBounds(cells);
172:
173:                // Initializes the context of the animation. The context consists
174:                // of all cells connected to either a cell or one of its parents.
175:                Object[] edges = DefaultGraphModel.getEdges(graph.getModel(),
176:                        cells).toArray();
177:                context = graph.getGraphLayoutCache().getMapping(edges);
178:            }
179:
180:            /**
181:             * Invoked to perform an animation step and stop the timer if all animation
182:             * steps have been performed.
183:             * 
184:             * @param event
185:             *            The object that describes the event.
186:             */
187:            public void actionPerformed(ActionEvent event) {
188:                if (step >= steps) {
189:                    Timer timer = (Timer) event.getSource();
190:                    timer.stop();
191:                    execute();
192:                } else {
193:                    step++;
194:                    Iterator it = newBounds.keySet().iterator();
195:                    while (it.hasNext())
196:                        updateCell(it.next());
197:                    graph.getGraphLayoutCache().update(context);
198:                    graph.getGraphics().setClip(clip);
199:                    graph.repaint();
200:                }
201:            }
202:
203:            /**
204:             * Executes the actual change on the graph layout cache. This implementation
205:             * restored the bounds on the modified cells to their old values for correct
206:             * undo of the change, then calls the graph layout cache's edit method with
207:             * the original nested map and cleans up the datastructures. This implements
208:             * the final step of the animation.
209:             */
210:            protected void execute() {
211:                try {
212:                    Iterator it = oldBounds.entrySet().iterator();
213:                    while (it.hasNext()) {
214:                        Map.Entry entry = (Map.Entry) it.next();
215:                        setCellBounds(entry.getKey(), (Rectangle2D) entry
216:                                .getValue());
217:                    }
218:                    graph.getGraphLayoutCache().edit(nestedMap, null, null,
219:                            null);
220:                } finally {
221:                    graph = null;
222:                    nestedMap = null;
223:                    oldBounds.clear();
224:                    newBounds.clear();
225:                    context = null;
226:                    clip = null;
227:                    step = 0;
228:                }
229:            }
230:
231:            /**
232:             * Updates the specified cell for {@link #step}. This implementation moves
233:             * the cell by a single increment towards it's final location using
234:             * {@link #setCellBounds(Object, Rectangle2D)} to update the cell's bounds.
235:             * 
236:             * @param cell
237:             *            The cell to be updated.
238:             */
239:            protected void updateCell(Object cell) {
240:                if (isAnimatable(cell)) {
241:                    Rectangle2D old = (Rectangle2D) oldBounds.get(cell);
242:                    Rectangle2D rect = (Rectangle2D) newBounds.get(cell);
243:                    double dx = (rect.getX() - old.getX()) * step / steps;
244:                    double dy = (rect.getY() - old.getY()) * step / steps;
245:                    Rectangle2D pos = new Rectangle2D.Double(old.getX() + dx,
246:                            old.getY() + dy, old.getWidth(), old.getHeight());
247:                    setCellBounds(cell, pos);
248:                }
249:            }
250:
251:            /**
252:             * Sets the bounds for the specified cell.
253:             * 
254:             * @param cell
255:             *            The cell whose bounds to set.
256:             * @param bounds
257:             *            The new bounds of the cell.
258:             */
259:            protected void setCellBounds(Object cell, Rectangle2D bounds) {
260:                Rectangle2D rect = graph.getCellBounds(cell);
261:                if (rect != null && bounds != null) {
262:                    rect.setFrame(bounds.getX(), bounds.getY(), bounds
263:                            .getWidth(), bounds.getHeight());
264:                    CellView view = graph.getGraphLayoutCache().getMapping(
265:                            cell, false);
266:                    if (view != null)
267:                        view.update(graph.getGraphLayoutCache());
268:                }
269:            }
270:
271:        }
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