The main purpose of this short program is to demonstrate mouse events: mouse clicks, mouse presses, mouse drags, and mouse releases. Utilizing
mouseDragged method, for instance, the nodes can be dragged around a panel. Double clicking a node will erase it. To connect two nodes, click both of them one by one.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189 | import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import java.util.*;
public class TreeDiagramMaker extends JFrame{
private JPanel pleft=null;
private JPanel pright=null;
private JButton bnode=null;
private JButton bline=null;
private JButton bsave=null;
private int counter=0;
private int curindex=0;
private ArrayList<Rectangle> nodes=null;
private int mousex=0,mousey=0;
private boolean pressed=false;
private ArrayList<Integer> parent=null;
private ArrayList<Integer> children=null;
//private ArrayList<Point> lines=null;
//private ArrayList<Point> lines2=null;
private int counterp=0;
int rect1=-1,rect2=-1;
public TreeDiagramMaker(){
super("Tree Diagram Maker");
setSize(900,700);
setLayout(new BorderLayout());
pleft=new JPanel();
bnode=new JButton();
BufferedImage bufimage=null;
try{
bufimage=ImageIO.read(new File("node.png"));
}catch(Exception e){
}
bnode.setIcon(new ImageIcon(bufimage));
bnode.addActionListener(new ButtonHandler());
pleft.add(bnode);
pright=new DrawDiagram();
pright.setPreferredSize(new Dimension(600,600));
pright.addMouseListener(new MouseHandler());
pright.addMouseMotionListener(new MouseHandler());
add(BorderLayout.WEST,pleft);
add(BorderLayout.EAST,pright);
nodes=new ArrayList<Rectangle>();
parent=new ArrayList<Integer>();
children=new ArrayList<Integer>();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
show();
}
class DrawDiagram extends JPanel{
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2=(Graphics2D)g;
if(!nodes.isEmpty()){
for(int i=0;i<nodes.size();i++){
g2.draw(nodes.get(i));
}
}
if(pressed){
g2.draw(nodes.get(curindex));
}
if(!parent.isEmpty()&&!children.isEmpty()){
for(int i=0;i<parent.size();i++){
int centerx1=(int)(nodes.get(parent.get(i)).getMinX())+(int)(nodes.get(parent.get(i)).getMaxX()-nodes.get(parent.get(i)).getMinX())/2;
int centery1=(int)(nodes.get(parent.get(i)).getMaxY());
int centerx2=(int)(nodes.get(children.get(i)).getMinX())+(int)(nodes.get(children.get(i)).getMaxX()-nodes.get(children.get(i)).getMinX())/2;
int centery2=(int)(nodes.get(children.get(i)).getMinY());
g2.drawLine(centerx1,centery1,centerx2,centery2);
}
}
}
}
class ButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
if(e.getSource()==bnode){
nodes.add(counter,new Rectangle(0,0,100,80));
curindex=counter;
counter++;
repaint();
}
}
}
class MouseHandler implements MouseMotionListener, MouseListener{
public void mouseMoved(MouseEvent e){
}
public void mouseDragged(MouseEvent e){
if(pressed){
mousex=e.getX();
mousey=e.getY();
nodes.get(curindex).setLocation(mousex,mousey);
repaint();
}
}
public void mouseEntered(MouseEvent e){
}
public void mouseExited(MouseEvent e){
}
public void mouseReleased(MouseEvent e){
pressed=false;
}
public void mousePressed(MouseEvent e){
for(int i=0;i<nodes.size();i++){
if(nodes.get(i).contains(e.getX(),e.getY())){
mousex=e.getX();
mousey=e.getY();
curindex=i;
pressed=true;
break;
}
}
}
public void mouseClicked(MouseEvent e){
if(e.getClickCount()==2){
rect1=-1;
rect2=-1;
for(int i=0;i<nodes.size();i++){
if(nodes.get(i).contains(e.getX(),e.getY())){
nodes.remove(i);
counter--;
curindex=0;
for(int j=0;j<parent.size();j++){
if(parent.get(j)==i){
parent.remove(j);
children.remove(j);
counterp--;
}
}
for(int j=0;j<children.size();j++){
if(children.get(j)==i){
children.remove(j);
parent.remove(j);
counterp--;
}
}
repaint();
break;
}
}
}
if(e.getClickCount()==1){
for(int i=0;i<nodes.size();i++){
if(nodes.get(i).contains(e.getX(),e.getY())){
if(rect1==-1){
rect1=i;
break;
}
if(rect1!=-1){
rect2=i;
if(rect2!=rect1){
parent.add(counterp,rect1);
children.add(counterp,rect2);
counterp++;
rect1=-1;
rect2=-1;
repaint();
break;
}
if(rect2==rect1){
rect1=-1;
rect2=-1;
break;
}
}
}
}
}
}
}
public static void main(String[] args){
TreeDiagramMaker ap=new TreeDiagramMaker();
}
}
|
