import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.geom.Line2D;
import java.io.*;
class SimpleWhiteboard extends JPanel{
public JButton saveButton;
public int lastX=0, lastY=0;
public SimpleWhiteboard(){
setPreferredSize(new Dimension(530,180));
setBorder(BorderFactory.createLineBorder(Color.yellow,3));
saveButton=new JButton("Ïðîáà");
JTextArea res = new JTextArea(10,20);
setBackground(Color.RED);
setFont(new Font("Serif",Font.BOLD,18));
add(res,BorderLayout.CENTER);
add(saveButton,BorderLayout.SOUTH);
addMouseListener(new PositionRecorder());
addMouseMotionListener(new LineDrawer());
}
public void record(int x, int y){
lastX=x;
lastY=y;
}
private class PositionRecorder extends MouseAdapter{
public void mouseEntered(MouseEvent event){
requestFocus();
record(event.getX(),event.getY());
}
public void mousePressed(MouseEvent event) {
record(event.getX(),event.getY());
}
}
public class LineDrawer extends MouseMotionAdapter{
Line2D line;
public void mouseDragged(MouseEvent event){
int x=event.getX();
int y=event.getY();
Graphics g= getGraphics();
System.out.println(g.hashCode());
//Line line;
Graphics2D k= (Graphics2D)g;
g.setColor(Color.green);
g.drawLine(lastX, lastY, x, y);
System.out.println(g.hashCode());
record(x,y);
System.out.println("X="+lastX);
//Graphics k= getGraphics();
System.out.println(k.hashCode());
}
}
}
? Но как лучше организовать именование обьектов, случайным числом. ведь будут и линии и овалы и квадраты и круги