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1
3
4 package org.jgroups.demos.wb;
5
6
7 import java.awt.*;
8 import java.awt.event.MouseEvent  ;
9 import java.awt.event.MouseListener ;
10 import java.awt.event.MouseMotionListener ;
11 import java.util.Vector ;
12 import org.jgroups.*;
13 import org.jgroups.blocks.*;
14 import org.jgroups.util.Util;
15
16
17
18
19 public class GraphPanel extends Panel implements MouseListener , MouseMotionListener {
20 final Whiteboard wb;
21 final Vector nodes=new Vector ();
22 final Vector copy=new Vector ();
23 String myname=null;
24 public Object my_addr=null;
25 Node pick;
26 boolean pickfixed;
27 Image offscreen;
28 Dimension offscreensize;
29 Graphics offgraphics;
30 static final Color fixedColor = Color.red;
31 static final Color selectColor = Color.pink;
32 final Color nodeColor = new Color(250, 220, 100);
33 final Font default_font=new Font("Helvetica",Font.PLAIN,12);
34
35
36
37 private Frame findParent() {
38 Component retval=getParent();
39
40 while(retval != null) {
41 if(retval instanceof Frame)
42 return (Frame)retval;
43 retval=retval.getParent();
44 }
45 return null;
46 }
47
48
49
50 Node findNodeAtPoint(Point p) {
51 int x=p.x, y=p.y;
52 Node n;
53
54 synchronized(nodes) {
55 if(nodes.size() < 1)
56 return null;
57 for(int i=nodes.size()-1; i >= 0; i--) {
58 n=(Node)nodes.elementAt(i);
59 if(x >= n.xloc && x <= (n.xloc + n.width) && y >= n.yloc && y <= (n.yloc + n.height))
60 return n;
61 }
62 }
63 return null;
64 }
65
66
67
68 public GraphPanel(Whiteboard wb) {
69 this.wb = wb;
70 addMouseListener(this);
71 addMouseMotionListener(this);
72 }
73
74
75 public void addNode(String lbl, Address addr, int xloc, int yloc) {
76 Node n = new Node();
77 n.x = xloc;
78 n.y = yloc;
79 n.lbl = lbl;
80 n.addr=addr;
81 nodes.addElement(n);
82 repaint();
83 }
84
85
86 public void removeNode(Object addr) {
87 Node n;
88 Object a;
89
90 if(addr == null) {
91 System.err.println("removeNode(): address of node to be removed is null !");
92 return;
93 }
94
95 synchronized(nodes) {
96 for(int i=0; i < nodes.size(); i++) {
97 n=(Node)nodes.elementAt(i);
98 a=n.addr;
99 if(a == null)
100 continue;
101 if(addr.equals(a)) {
102 nodes.removeElement(n);
103 System.out.println("Removed node " + n);
104 break;
105 }
106 }
107 repaint();
108 }
109 }
110
111
112 public void adjustNodes(Vector v) {
114 Node n;
115 boolean removed=false;
116
117 synchronized(nodes) {
118 for(int i=0; i < nodes.size(); i++) {
119 n=(Node)nodes.elementAt(i);
120 if(!v.contains(n.addr)) {
121 System.out.println("adjustNodes(): node " + n + " was removed");
122 nodes.removeElement(n);
123 removed=true;
124 }
125 }
126 if(removed)
127 repaint();
128 }
129 }
130
131
132 public void paintNode(Graphics g, Node n, FontMetrics fm) {
133 String addr=n.addr != null ? n.addr.toString() : null;
134 int x = (int)n.x;
135 int y = (int)n.y;
136 g.setColor((n == pick) ? selectColor : (n.fixed ? fixedColor : nodeColor));
137 int w = fm.stringWidth(n.lbl) + 10;
138
139 if(addr != null)
140 w=Math.max(w, fm.stringWidth(addr) + 10);
141
142 if(addr == null)
143 addr="<no address>";
144
145 int h = (fm.getHeight() + 4) * 2;
146 n.width=w;
147 n.height=h;
148 n.xloc=x - w/2;
149 n.yloc=y - h/2;
150 g.fillRect(x - w/2, y - h / 2, w, h);
151 g.setColor(Color.black);
152 g.drawRect(x - w/2, y - h / 2, w-1, h-1);
153 g.drawString(n.lbl, x - (w-10)/2, (y - (h-4)/2) + fm.getAscent());
154 g.drawString(addr, x - (w-10)/2, (y - (h-4)/2) + 2 * fm.getAscent() +4 );
155 }
156
157
158
159 public synchronized void update(Graphics g) {
160 Dimension d = getSize();
161 if ((offscreen == null) || (d.width != offscreensize.width) ||
162 (d.height != offscreensize.height)) {
163 offscreen = createImage(d.width, d.height);
164 offscreensize = d;
165 offgraphics = offscreen.getGraphics();
166 offgraphics.setFont(default_font);
167 }
168
169 offgraphics.setColor(getBackground());
170 offgraphics.fillRect(0, 0, d.width, d.height);
171
172 FontMetrics fm = offgraphics.getFontMetrics();
173 for (int i = 0; i < nodes.size(); i++) {
174 paintNode(offgraphics, (Node)nodes.elementAt(i), fm);
175 }
176
177 g.drawImage(offscreen, 0, 0, null);
178 }
179
180
181
182
183
184 public void mouseDragged(MouseEvent e) {
185 Point p=e.getPoint();
186 int mod=e.getModifiers();
187
188 if(pick == null)
189 return;
190
191 pick.x=p.x;
192 pick.y=p.y;
193 repaint();
194 }
195
196
197
198
199 public void mousePressed(MouseEvent e) {
200 Point p=e.getPoint();
201 double bestdist = Double.MAX_VALUE, dist;
202 int mod=e.getModifiers();
203 Node n;
204 String msg;
205
206
207 if((mod & MouseEvent.BUTTON3_MASK) != 0) {
208 System.out.println("\nright button at " + p);
209 n=findNodeAtPoint(p);
210 if(n != null) {
211 System.out.println("Found node at " + p + ": " + n);
212 SendDialog dlg=new SendDialog(findParent(), n, myname, wb.disp, wb.groupname);
213 repaint();
214 }
215 e.consume();
216 return;
217 }
218
219
220 for (int i = 0 ; i < nodes.size() ; i++) {
221 n=(Node)nodes.elementAt(i);
222 dist = (n.x - p.x) * (n.x - p.x) + (n.y - p.y) * (n.y - p.y);
223 if (dist < bestdist) {
224 pick = n;
225 bestdist = dist;
226 }
227 }
228 pickfixed = pick.fixed;
229 pick.fixed = true;
230 pick.x = p.x;
231 pick.y = p.y;
232 repaint();
233 }
234
235
236
237
238 public void mouseReleased(MouseEvent e) {
239 Point p=e.getPoint();
240 int mod=e.getModifiers();
241
242 if(pick == null)
243 return;
244
245 pick.x = p.x;
246 pick.y = p.y;
247 pick.fixed = pickfixed;
248
249
250 try {
251 MethodCall call = new MethodCall("moveNode", new Object [] {pick}, new String [] {Node.class.getName()});
252 wb.disp.callRemoteMethods(null, call, GroupRequest.GET_ALL, 0);
253 }
254 catch(Exception ex) {
255 System.err.println(ex);
256 }
257
258 pick = null;
259 }
260
261
262 public void mouseEntered(MouseEvent e) {}
263 public void mouseExited(MouseEvent e) {}
264 public void mouseMoved(MouseEvent e) {}
265 public void mouseClicked(MouseEvent e) {}
266
267
268
269
270 public void start(String name) {
271 myname=name;
272 int xloc = (int)(10 + 250*Math.random());
273 int yloc = (int)(10 + 250*Math.random());
274
275 try {
276 MethodCall call=new MethodCall("addNode",
277 new Object [] {name, my_addr, new Integer (xloc), new Integer (yloc)},
278 new String [] {String .class.getName(), Address.class.getName(), int.class.getName(), int.class.getName()});
279 wb.disp.callRemoteMethods(null, call, GroupRequest.GET_ALL, 0);
280 }
281 catch(Exception e) {
282 System.err.println(e);
283 }
284 repaint();
285 }
286
287
288 public void stop() {
289 nodes.removeAllElements();
290 }
291
292
293
294
295 public void saveState() {
296 copy.removeAllElements();
297 synchronized(nodes) {
298 for(int i=0; i < nodes.size(); i++)
299 copy.addElement(nodes.elementAt(i));
300 }
301 }
302
303
304 public byte[] getState() { try {
306 return Util.objectToByteBuffer(copy);
307 }
308 catch(Throwable ex) {
309 ex.printStackTrace();
310 return null;
311 }
312 }
313
314
315 public void setState(byte[] data) {
316 Vector n;
317 Object new_state;
318
319 try {
320 new_state=Util.objectFromByteBuffer(data);
321 }
322 catch(Exception ex) {
323 ex.printStackTrace();
324 return;
325 }
326
327 synchronized(nodes) {
328 nodes.removeAllElements();
329 if(new_state != null) {
330 n=(Vector )new_state;
331 for(int i=0; i < n.size(); i++)
332 nodes.addElement(n.elementAt(i));
333 repaint();
334 }
335 }
336 }
337
338
339 public void moveNode(Node n) {
340 Node tmp;
341 boolean changed=false;
342
343 synchronized(nodes) {
344 for(int i=0; i < nodes.size(); i++) {
345 tmp=(Node)nodes.elementAt(i);
346 if(n.addr.equals(tmp.addr)) {
347 tmp.x=n.x;
348 tmp.y=n.y;
349 changed=true;
350 break;
351 }
352 }
353 if(changed)
354 repaint();
355 }
356 }
357
358 }
359 |
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