Drawing in Graphic-Context of a JPanel in a JPanel

[Raschin Ghanad]

I have a Panel that has a Panel inside (to get some inset in my Panel.)
The problem is, that it just works, if I draw into the main Panel.
If I try to get the Graphic context of my other JPanel and write into it,
I just see my drawing for breaks of seconds when I rezise the Frame (where the JPanelis inside).
If I don't resize, I see nothing, if I finish resizing, the same.

Here ist my Code.
Maybe the paint-Method is just called when resizing now?

Can anyone help ?
Is there another possibility to get some inset for my drawing Area?

Here is my Code:

 
public class CurvePanel extends JPanel {
 
  JPanel screenPanel;
  private Vector elements = new Vector(); 
  private int x1,y1,x2,y2;
  
  /** Creates a new instance of SpecUICurve */
  public CurvePanel() {          
        setPreferredSize(new java.awt.Dimension(450, 450));
        setLayout(new java.awt.GridBagLayout());                  
        setBorder(new javax.swing.border.BevelBorder(javax.swing.border.BevelBorder.LOWERED));           
        
        screenPanel = new JPanel();
        screenPanel.setBorder(new javax.swing.border.BevelBorder(javax.swing.border.BevelBorder.LOWERED));
        screenPanel.setPreferredSize(new java.awt.Dimension(430, 430));        
        screenPanel.setVisible(true);        
        this.add(screenPanel, new java.awt.GridBagConstraints());        
        
        int inset = 20;                              
        setAxis(inset, 50, inset, 300);     
        setAxis(inset, 300, 350, 300);      
  }  
  
  public void setAxis(int x1,int y1,int x2,int y2) {
    this.x1 = x1; this.y1 = y1;
    this.x2 = x2; this.y2 = y2;
    
    elements.add(new Line(x1, y1, x2, y2));      
  }
  
  public void addPath(Vector v) {
    System.out.println("in addPath");
    int[] x = new int[v.size()+1];
    int[] y = new int[v.size()+1];
    int i = 0;
     for (Iterator iter = v.iterator(); iter.hasNext()    :wink:     {
          Point p = (Point) iter.next();
          x[i] = (int) p.getX();
          y[i] = (int) p.getY();                                    
          i++;
     }            
    Path p =new Path(x[0], y[0]);
    
    for(int u=1;u<i;u++) {
      System.out.println("Add Line to Path:" + x[u] + "; " + y[u]);
       p.setGeneralPath(x[u], y[u]);
    }
    p.closeGeneralPath();
    elements.add(p);              
  }
    
  public void addCurve(Vector v) {
    int[] x = new int[v.size()+1];
    int[] y = new int[v.size()+1];
    int i = 0;
     for (Iterator iter = v.iterator(); iter.hasNext()    :wink:     {
          Point p = (Point) iter.next();
          x[i] = (int) p.getX();
          y[i] = (int) p.getY();                                    
          i++;
     }            
    for(int u=0;u<i;u++) {
      elements.add(new Line(x[u],y[u],x[u+1],y[u+1]));      
    }    
  }
[B]
  public void paint(Graphics g) {                
 
    g = screenPanel.getGraphics();  //!!! whithout this I see some result!
 
    Graphics2D g2 = (Graphics2D)g;
    Stroke stroke = new BasicStroke( 2 );    
    g2.setStroke( stroke );    
           
    System.out.println("\n \n");
    
    int i = 0;
    for (Iterator iter = elements.iterator(); iter.hasNext()    :wink:     {
           ((Basic) iter.next()).paint( g2 );   
            System.out.println("It:" + i);i++;
    }    
  }             [/B]
}
 
  

[ July 29, 2004: Message edited by: Raschin Ghanad ]

[Joe Ess]

Since you didn't override screenPanel's paint method, it is probably painting itself over your own paint efforts. Have a gander at the Custom Painting chapter of the Java Tutorial for some more detail.

[Raschin Ghanad]

yes, thats what I was thinking about, too.
But how can I override it without creating a new class that extends a JPanel and then adding it?

Can't I use my actual paint-Method to write into the Graphic-Context of the the component using the getGraphcis() method?


Sorry, I haven't time to read the tut, but I will do so in a while.

thanx for fast response
[ July 29, 2004: Message edited by: Raschin Ghanad ]