How to make Lines I draw Draggable and Moveable etc??

[Michelle Wang]

Hello Sir:
I have following code that can draw lines at my will, but I hope to
[1]. Keep all lines I draw here;
[2]. make them draggable and moveable and deletable,
How can I do that??
see code below

[1]. main code

    
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JLayeredPane;
import javax.swing.JPanel; 
 
public class DynamicLineDemo extends JPanel
{
JLayeredPane panel = new JLayeredPane();
 
public DynamicLineDemo()
{
super();
setSize(500,600);
setLayout(new BorderLayout());
 setBounds(10,10,650,470);
 add(panel,BorderLayout.CENTER);
 panel.setLayout(null);
 
 DynamicLines line1 = new DynamicLines(panel);
line1.setBounds(getBounds());

DynamicLines line2 = new DynamicLines(panel);
line2.setBounds(getBounds());

this.setSize(750,500);
this.setVisible(true);
setVisible(true);

}

public static void main(String args[])
{

    JFrame f = new JFrame("Test");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    DynamicLineDemo  ld = new DynamicLineDemo();
    f.add(ld);
    f.setSize(400,300);
    f.setLocation(200,200);
    f.setVisible(true);

}
}
 
 

 
 
sub program
 
 
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
 
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.BasicStroke;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Component;
import javax.swing.JLayeredPane;
import javax.swing.JComponent;
import java.awt.geom.Line2D;
import java.awt.geom.Line2D.Double;
import java.lang.*;
import java.awt.*;
import javax.swing.*;
 
public class DynamicLines extends JPanel implements MouseListener, MouseMotionListener{
int startX;
int startY;
int endX;
int endY;
int mx;
int my;
//int startX, startY, endX, endY;
JLayeredPane canvas;
BasicStroke stroke = new BasicStroke(10);
Line2D myline;
boolean isSelected = false;
boolean isContainWhilePress = false;
Color color = Color.BLACK;
 
//*****************************************************************
public void mouseClicked(MouseEvent arg0) 
{

if(isContain(arg0.getPoint()));
canvas.repaint();
 
}
 

public void mouseEntered(MouseEvent arg0) 
{
}
 

public void mouseExited(MouseEvent arg0) 
{
}
 

public void mousePressed(MouseEvent m) 
{
if(this.isContain(m.getPoint()))
{
mx = m.getX();
my = m.getY();
this.isContainWhilePress = true;
}
repaint(); 
}
 

public void mouseReleased(MouseEvent arg0) 
{
this.isContainWhilePress = false;
 
}

public void mouseMoved(MouseEvent e)
{
                  this.isContain(e.getPoint());
                 repaint();
}

public void mouseDragged(MouseEvent m)
{
                   if(this.isContainWhilePress)
                   {
                      int x = getX() + m.getX() - mx;
int y = getY() + m.getY() - my;
setLocation(x,y);
}
else
{
Component c = this.canvas.getComponentAt(m.getPoint());
if(c != null)
this.canvas.moveToBack(this);
}
repaint();
}

/* Checks whether a Point cuts the Line */
public boolean isContain(Point point)
{
Shape outline = stroke.createStrokedShape(myline);
if (outline.contains(point)) 
{
isSelected = true;
this.canvas.moveToFront(this);
return true;
    }
    else
    this.canvas.moveToBack(this);
    isSelected = false;
    return false;
}

/* Checks whether an area cuts the Line */
public boolean intersects(Rectangle r)
{
Shape outline = stroke.createStrokedShape(myline);
if (outline.contains(r)) 
{
isSelected = true;
this.canvas.moveToFront(this);
return true;
    }
    else
    this.canvas.moveToBack(this);
    isSelected = false;
    return false;
}

/* Methods for resizing Lines */
public void setLine(int x1, int y1, int x2, int y2)
 {
 startX = x1;
startY = y1;
endX   = x2;
endY   = y2;
this.repaint();
 }
 
 /* Methods for resizing Lines */
 public void setLine(Point start, Point end)
 {
 startX = (int)start.getX();
startY = (int)start.getY();
endX   = (int)end.getX();
endY   = (int)end.getY();
this.repaint();
 }
//*****************************************************************
  public DynamicLines(JLayeredPane canvas) {
    super();
    MouseListener drawing1 = new MouseListener() {
      public void mouseClicked(MouseEvent e) {
      }
 
      public void mouseEntered(MouseEvent e) {
      }
 
      public void mouseExited(MouseEvent e) {
      }
 
      public void mousePressed(MouseEvent e) {
        color = Color.RED;
        startX = endX = e.getX();
        startY = endY = e.getY();
        repaint();
      }
 
      public void mouseReleased(MouseEvent e) {
        color = Color.BLACK;
        repaint();
      }
    };
    addMouseListener(drawing1);
 
    MouseMotionListener drawing2 = new MouseMotionListener() {
      public void mouseDragged(MouseEvent e) {
        endX = e.getX();
        endY = e.getY();
        repaint();
      }
 
      public void mouseMoved(MouseEvent e) {
      }
    };
    addMouseMotionListener(drawing2);
 
addMouseListener(this);
addMouseMotionListener(this);
this.canvas = canvas;
this.setOpaque(false);
this.setRequestFocusEnabled(true);
canvas.add(this);
  }
 
protected void paintComponent(Graphics g)
 {
super.paintComponent(g);
Graphics2D g2D = (Graphics2D)g;
      g2D.setStroke(new BasicStroke(5.0f));
      myline = new Line2D.Double(startX,startY,endX,endY);
      g2D.draw(myline);
 }
 
}
 
 

[ October 30, 2007: Message edited by: Michelle Wang ]