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.
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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();
}
}
|
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