Traffic Organizing In JAVA2D Problems

hi everybody,
please try to understand me becuase my english is not so good..

i study in Damasucs university,IT..

i have a project : Traffic Organizing

i used java2D to draw Map

i made very good work until now

but I have some problems:

1-how can i save the new map (that the user draw it)..

2-when the user load an image from PC some parts of it disapear and after seconds it apears or after click on some part on screen >>> how can make it apear always ...

this the code :

Code:

---

try{
      Graphics2D g2=(Graphics2D)jPanel6.getGraphics();
      File file = new File( "src/Maps/Capture.jpg" );
      FileInputStream inputStream = new FileInputStream( file );
      JPEGImageDecoder decoder =JPEGCodec.createJPEGDecoder( inputStream );
      BufferedImage image = decoder.decodeAsBufferedImage();

      g2.drawImage(image, 0,0,image.getWidth(), image.getHeight(),this);
}

---

and this the code of dialog to load the image :

Code:

---

try {
            JFileChooser  jFileChooser1=new JFileChooser();
            int response = jFileChooser1.showOpenDialog( this );
            if (response==JFileChooser.APPROVE_OPTION)
            {
              File FileName =jFileChooser1.getSelectedFile();
              Image_Loaded_Name=FileName.getAbsolutePath();
              jLabel1.setText(FileName.getName());

              FileInputStream inputStream = new FileInputStream(Image_Loaded_Name);
              JPEGImageDecoder decoder =JPEGCodec.createJPEGDecoder( inputStream );
              Back_Image=decoder.decodeAsBufferedImage();
             
            }
        } catch(Exception e) {      }

---

and this the code of drawing streets and map :

Code:

---

g4=(Graphics2D)jPanel4.getGraphics();
    g4.drawImage(Back_Image,0,0,Back_Image.getWidth(),Back_Image.getHeight(),null);
  double dx,dy;
    stroke1 = new BasicStroke(6,BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND, 0,dashPattern1, 0);
    stroke2 = new BasicStroke(1,BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND, 0,dashPattern, 0);

for(int i=0;i<counter-1 ;i++)
        {
        if (points[i][0]!=-10000000&&points[i+1][0]!=-10000000)
            {
                dx=Math.abs(points[i][0]-points[i+1][0]);
                dy=Math.abs(points[i][1]-points[i+1][1]);
                g4.setColor(Color.DARK_GRAY);
                  g4.setFont(new Font("",2,16));
                g4.setStroke(stroke1);
                g4.draw(new Line2D.Double(points[i][0],points[i][1],points[i+1][0],points[i+1][1]));
               
                g4.setStroke(stroke2);
                g4.setColor(Color.white);
                g4.draw(new Line2D.Double(points[i][0],points[i][1],points[i+1][0],points[i+1][1]));

            }
        }

      for (int i=0;i<node_counter  ;i++)
        {      g4.setColor(Color.blue);
                Ellipse2D e1=new Ellipse2D.Float(points_circle[i][0],  points_circle[i][1], radius_node, radius_node);
                Ellipse2D e2=new Ellipse2D.Float(points_circle[i][0]+2,  points_circle[i][1]+2, radius_node-4, radius_node-4);
                g4.draw(e1);
                g4.draw(e2);
               
        }

---

3- when i resize the window the graphics also disapear >>
:confused::confused:

please try to help me:o

Read the Sun tutorials on using graphics in Swing and Java2D as this is not how you're supposed to paint. You'll want to instead use the paintComponent method, and the tutorials will show you how. Much luck.

I tried the paint component before and i tried again >>>
it didn't work >>>

ok..... look the problem that when i open dailog (load,save) some part of the map(i.e the graphics in the panel) disapear ...

is there any other solution...

thanks for helping me...

Quote:

---

Originally Posted by tamer

is there any other solution...

---

No. The tutorials describe the correct way to do graphics.

ohhhh it's done .....

thanx the problem solved by this code

Code:

---

@Override
public void paint( Graphics g)
{
    super.paintComponents(g);
    Draw();


}

---

:):)
thanx very much ...

Quote:

---

Originally Posted by tamer

ohhhh it's done .....

thanx the problem solved by this code

Code:

---

@Override
public void paint( Graphics g)
{
    super.paintComponents(g);
    Draw();


}

---

:):)
thanx very much ...

---

This looks like dangerous code that I suggest you fix quickly. You should not be calling the super.paintComponent method from within a paint override. Instead I suggest that you override paintComponent and call the super paintComponent method from within it. Ignore this advice at your own risk. Best of luck.