筆者最近公司的新項(xiàng)目需要對(duì)網(wǎng)絡(luò)設(shè)備連接狀態(tài)的進(jìn)行監(jiān)聽。在網(wǎng)上找啊找，終于發(fā)現(xiàn)了JGraph這個(gè)開源的開發(fā)包可以利用。雖然用起來還是比較麻煩，但總比自己用SWING，AWT慢慢寫要輕松許多。
下面簡(jiǎn)單介紹下最近摸索JGraph的用法（復(fù)雜的用法還沒有研究出來），首先是整個(gè)的畫布，JGraph的畫布有一個(gè)GraphModel，畫面上所有的對(duì)象都要添加在GraphModel中。其次是畫面上的各種元素， JGraph將圖元定義為一個(gè)一個(gè)的cell，每個(gè)cell可以是一個(gè)頂點(diǎn)（Vertex）、邊（Edge）或者節(jié)點(diǎn)（Port）中的一種。頂點(diǎn)可以有鄰接的頂點(diǎn)，他們通過邊相聯(lián)系，邊連接的兩個(gè)端點(diǎn)稱為目標(biāo)和源，每個(gè)目標(biāo)或者源是一個(gè)節(jié)點(diǎn)。節(jié)點(diǎn)是頂點(diǎn)的孩子。每個(gè)cell都可以有自己的孩子。然后是為畫布和畫面上的元素添加屬性。
每個(gè)cell的外觀由相應(yīng)的屬性定義，屬性序列是指一系列的鍵－值對(duì)，他們以Map形式組織，例如：
// 創(chuàng)建LOCAL SERVER對(duì)象及屬性
DefaultGraphCell LocServer = new DefaultGraphCell("LOCAL SERVER");
Map LocServerattrib = new Hashtable();
attributes.put(LocServer, LocServerattrib);
GraphConstants.setIcon(LocServerattrib, icon);
GraphConstants.setBorder(LocServerattrib, BorderFactory
.createCompoundBorder());
GraphConstants.setEditable(LocServerattrib, false);
最后是添加事件，JGraph里有一個(gè)BasicMarqueeHandler類，應(yīng)該是用來捕捉事件的，我的鼠標(biāo)雙擊事件如下：
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2 && e.getButton() == MouseEvent.BUTTON1) {
Object[] obj = BasicMarqueeHandler.getGraphForEvent(e)
.getSelectionCells();
if (obj.length != 0) {
System.out.println(obj[obj.length - 1].toString());
}
}
}
對(duì)于JGraph，我是在摸索中學(xué)習(xí)的，只能簡(jiǎn)單的介紹下最基本的應(yīng)用，由于工作進(jìn)度，只能先這樣用了，還請(qǐng)各位高手多多指點(diǎn)。下面是我學(xué)習(xí)摸索時(shí)做的小例子， 請(qǐng)大家多提寶貴意見。
1
package example;
2
3import java.awt.BorderLayout;
4import java.awt.event.MouseEvent;
5import java.awt.event.MouseListener;
6import java.awt.geom.Rectangle2D;
7import java.awt.Dimension;
8import java.awt.Font;
9import java.awt.Color;
10
11import java.util.Hashtable;
12import java.util.Map;
13
14import javax.swing.BorderFactory;
15import javax.swing.Icon;
16import javax.swing.ImageIcon;
17import javax.swing.JFrame;
18import javax.swing.JPanel;
19import javax.swing.JScrollPane;
20
21import org.jgraph.JGraph;
22import org.jgraph.graph.BasicMarqueeHandler;
23import org.jgraph.graph.ConnectionSet;
24import org.jgraph.graph.DefaultEdge;
25import org.jgraph.graph.DefaultGraphCell;
26import org.jgraph.graph.DefaultGraphModel;
27import org.jgraph.graph.DefaultPort;
28import org.jgraph.graph.GraphConstants;
29import org.jgraph.graph.GraphModel;
30
31
public class topology 
{
32
/** *//**
33
* 本程序用于畫網(wǎng)絡(luò)拓?fù)鋱D
34
*/
35 public static void main(String[] args) {
36 JFrame frame = new topologyFrame(4);
37 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
38 frame.setVisible(true);
39 }
40
}
41
42/** *//**
43 * 主畫面
44 */
45class topologyFrame extends JFrame {
46 private static final int DEFAULT_WIDTH = 1024;
47 private static final int DEFAULT_HEIGHT = 768;
48
49 public topologyFrame(int iNumber) {
50 this.setTitle("拓?fù)鋱D");
51 this.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
52
53 final topologyPanel panel = new topologyPanel(iNumber);
54 this.add(panel, BorderLayout.CENTER);
55
56 }
57}
58
59/** *//**
60 * 拓?fù)鋱D面板
61 */
62class topologyPanel extends JPanel {
63 private static final int PANEL_WIDTH = 1024;
64 private static final int PANEL_HEIGHT = 768;
65 private static final int SERVER_WIDTH = 64;
66 private static final int SERVER_HEIGHT = 96;
67 private static final int LINE_LENGTH = 250;
68 private static final String IMAGE_DIR = "D:\\testimg\\SERVER.jpg";
69
70 public topologyPanel(int iServerNum) {
71 setSize(PANEL_WIDTH, PANEL_HEIGHT);
72 this.add(new JScrollPane(setTopologyMaker(iServerNum)));
73 }
74
75 /** *//**
76 * 通過點(diǎn)坐標(biāo)畫線
77 */
78 private JGraph setTopologyMaker(int iServer) {
79
80 GraphModel model = new DefaultGraphModel();
81 Object[] cells = null;
82 final JGraph graph = new JGraph(model);
83 graph.setSelectionEnabled(true);
84 graph.addMouseListener(new MouseEventDemo());
85 Map attributes = new Hashtable();
86 Map LocServerattrib = new Hashtable();
87 Icon icon = new ImageIcon(IMAGE_DIR);
88 double iAngle = 0;
89
90 graph.setMinimumSize(new Dimension(PANEL_WIDTH, PANEL_HEIGHT));
91 graph.setAutoResizeGraph(false);
92 graph.setSizeable(false);
93 graph.setLocation(0, 0);
94 graph.setSize(PANEL_WIDTH, PANEL_HEIGHT);
95
96 // 創(chuàng)建LOCAL SERVER對(duì)象及屬性
97 DefaultGraphCell LocServer = new DefaultGraphCell("LOCAL SERVER");
98 attributes.put(LocServer, LocServerattrib);
99 GraphConstants.setIcon(LocServerattrib, icon);
100 GraphConstants.setBorder(LocServerattrib, BorderFactory
101 .createCompoundBorder());
102 GraphConstants.setEditable(LocServerattrib, false);
103
104 // 中心顯示本地SERVER
105 attributes.put(LocServer, LocServerattrib);
106 Rectangle2D LocServerbounds = new Rectangle2D.Double(graph.getWidth() / 2
107 - SERVER_WIDTH / 2, graph.getHeight() / 2 - SERVER_HEIGHT / 2,
108 SERVER_WIDTH, SERVER_HEIGHT);
109 GraphConstants.setBounds(LocServerattrib, LocServerbounds);
110 GraphConstants.setValue(LocServerattrib, "LOCAL SERVER");
111 GraphConstants.setFont(LocServerattrib, new Font(null, Font.BOLD, 10));
112
113 DefaultPort LocPort = new DefaultPort();
114 LocServer.add(LocPort);
115
116 cells = new Object[] { LocServer };
117 model.insert(cells, attributes, null, null, null);
118
119 if (iServer != 0) {
120 iAngle = 360 / iServer;
121 } else {
122 iAngle = 0;
123 }
124
125 for (int i = 0; i < iServer; i++) {
126 double x;
127 double y;
128
129 x = graph.getWidth()
130 / 2
131 + (java.lang.Math.cos(((iAngle) * i + 45)
132 * java.lang.Math.PI / 180) * LINE_LENGTH)
133 - SERVER_WIDTH / 2;
134 y = graph.getHeight()
135 / 2
136 - (java.lang.Math.sin(((iAngle) * i + 45)
137 * java.lang.Math.PI / 180) * LINE_LENGTH)
138 - SERVER_HEIGHT / 2;
139
140 // 創(chuàng)建PEER SERVER對(duì)象及屬性
141 DefaultGraphCell peerServer = new DefaultGraphCell("PEER SERVER"
142 + (i + 1));
143 Map PeerServerattrib = new Hashtable();
144 attributes.put(peerServer, PeerServerattrib);
145 GraphConstants.setIcon(PeerServerattrib, icon);
146 GraphConstants.setBorder(PeerServerattrib, BorderFactory
147 .createCompoundBorder());
148 GraphConstants.setEditable(PeerServerattrib, false);
149
150 attributes.put(peerServer, PeerServerattrib);
151
152 Rectangle2D PeerMTAbounds = new Rectangle2D.Double(x, y, SERVER_WIDTH,
153 SERVER_HEIGHT);
154 // System.out.println("(" + x + "," + y + ")");
155 GraphConstants.setBounds(PeerServerattrib, PeerMTAbounds);
156 GraphConstants.setValue(PeerServerattrib, "PEER SERVER" + (i + 1));
157 GraphConstants
158 .setFont(PeerServerattrib, new Font(null, Font.BOLD, 10));
159
160 DefaultPort PeerPort = new DefaultPort();
161 peerServer.add(PeerPort);
162
163 // 創(chuàng)建邊對(duì)象及屬性
164 DefaultEdge edge = new DefaultEdge();
165 Map edgeattrib = new Hashtable();
166 attributes.put(edge, edgeattrib);
167 int arrow = GraphConstants.ARROW_NONE;
168 GraphConstants.setLineEnd(edgeattrib, arrow);
169 GraphConstants.setEditable(edgeattrib, false);
170 GraphConstants.setLabelAlongEdge(edgeattrib, true);
171 GraphConstants.setEndFill(edgeattrib, true);
172 GraphConstants.setDisconnectable(edgeattrib, false);
173 GraphConstants.setValue(edgeattrib, "R" + (i + 1));
174 GraphConstants.setFont(edgeattrib, new Font(null, Font.BOLD, 10));
175 GraphConstants.setLineColor(edgeattrib, Color.GREEN);
176 GraphConstants.setLineWidth(edgeattrib, 1.5f);
177
178 // 連接邊的兩個(gè)節(jié)點(diǎn)
179 ConnectionSet cs = new ConnectionSet(edge, LocPort, PeerPort);
180
181 cells = new Object[] { edge, peerServer };
182
183 // 向model添加cells對(duì)象
184 model.insert(cells, attributes, cs, null, null);
185
186 }
187 return graph;
188 }
189}
190
191class MouseEventDemo implements MouseListener {
192
193 public void mouseClicked(MouseEvent e) {
194 if (e.getClickCount() == 2 && e.getButton() == MouseEvent.BUTTON1) {
195 Object[] obj = BasicMarqueeHandler.getGraphForEvent(e)
196 .getSelectionCells();
197 if (obj.length != 0) {
198 System.out.println(obj[obj.length - 1].toString());
199 }
200 }
201 }
202
203 public void mouseEntered(MouseEvent e) {
204 // System.out.println("mouseEntered");
205 }
206
207 public void mouseExited(MouseEvent e) {
208 // System.out.println("mouseExited");
209 }
210
211 public void mousePressed(MouseEvent e) {
212 // System.out.println("mousePressed");
213 }
214
215 public void mouseReleased(MouseEvent e) {
216 // System.out.println("mouseReleased");
217 }
218}
posted on 2008-08-29 10:08
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