scrollbar issue

[kumar_gemi]

Hello,

I do have a jpanel to which I am adding a scrollpane. Everything is working fine till that point. I do have a set of codes which draws vertical lines and if I do move the scollbar then nothing happens.

Here comes my issue. I am also drawing some horizontal lines. When I drag the knob of the scrollbar the horizontal lines get erased leaving the vertical lines alone.

I tried my best to figure out the issue but couldn't solve it. Any help would be appreciated.

I have also attached a partial code along with this thread.

Thanks in advance
gemi

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/*
 * DrawCanvas_UI.java
 *
 * Created on Mar 13, 2009, 2:27:13 PM
 */

package DrawCanvas_UI;

//import DrawCanvas_UI.Drawlines;

import interaction.*;
import java.awt.Adjustable;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.ScrollPane;
import java.awt.event.AdjustmentEvent;
import java.awt.event.AdjustmentListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Vector;
import javax.swing.JPanel;

/**
 *
 * @author arun
 */
public class DrawCanvas_UI extends javax.swing.JFrame {

    
    Driver drive = new Driver();
    BAP bap = new BAP();
    static int processmax ;
    static int eventmax ;

    Vector vSrc = new Vector();
    Vector vDest = new Vector();
    Vector vEvent = new Vector();

    ScrollPane scroller;


    public static int MAX_Horzspace = 10; // horizontal spacing between events
    public static final int Unit_Const1 = 1;    // p1 to p0
    public static final int Unit_Const2 = 10;   
    public static final int Unit_Const_pi = 5;

     float stroke = 0;

     drawArrow arrow = new drawArrow();


     MyAdjustmentListener listener = new MyAdjustmentListener();



    /** Creates new form DrawCanvas_UI */
    public DrawCanvas_UI() {


        // Code to initiate the driver class so that it opens the file does all processing
       //  Driver drive = new Driver();
         try{
             drive.filesplit();
         }catch(FileNotFoundException e){
             e.printStackTrace();
         }catch(IOException e){
            e.printStackTrace();
         }

         
       initComponents();

       
       scroller = new ScrollPane(ScrollPane.SCROLLBARS_AS_NEEDED);
       scroller.add(new DrawCanvas());

        Adjustable vadjust = scroller.getVAdjustable();
        Adjustable hadjust = scroller.getHAdjustable();
        hadjust.setUnitIncrement(10);
        vadjust.setUnitIncrement(10);
       
       scroller.getHAdjustable().addAdjustmentListener(listener);
       scroller.getVAdjustable().addAdjustmentListener(listener);

       scroller.setSize(925,740); // Here, the drawingPanel is set larger than the size of the JFrame which
       //contains it.

      

        add("Center", scroller);

        pack();   // pack resizes the Window to the minimum size to satisfy the preferred size of each of the components in the layout
       
       

        
    }

    

 
                             
                         

    private void BrowseActionPerformed(java.awt.event.ActionEvent evt) {                                       



        // TODO add your handling code here:
        
            // TODO add your handling code here:
            //Code to perform input dialog event

        InputDialog id = new InputDialog();
        int n = id.incrementHorzSize();
        MAX_Horzspace = n;
        System.out.println(MAX_Horzspace);

        if (MAX_Horzspace != 10)
        {
          //  repaint();
            
            DrawCanvas_UI dr = new DrawCanvas_UI();
            dr.drawPanel.repaint();
                                  
        }

        
    }                                      




    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new DrawCanvas_UI().setVisible(true);
                 
            }
        });
    }






 //code to draw vertical lines

class DrawCanvas extends JPanel{

         
    scrollwindow scroll = new scrollwindow(); // this defines the size of the panel so that the scrollbar knows how much to increment
    int  scrollh = scroll.getScrollhorizontal();

   
    Vector vPoint1 = new Vector();
    Vector vPoint2 = new Vector();
 //   Point p = new Point();

    private int xa;
    private int xb;
    private int ya = 50;
    private int yb ;

    DrawCanvas()
    {
        
       
         
    }
    

          
      public Dimension getPreferredSize() {

               
    //  return new Dimension(10200, 6000);

          
        
        return new Dimension(scrollh, 6000);


    }


     
    protected void paintComponent(Graphics g) {

        
      super.paintComponent(g);
      Graphics2D g2 = (Graphics2D) g;
      g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);



       processmax = bap.maxProcess(); // to find the maximum no of process


      // code to find the source , dest , event to find a string and receive match
       
      vSrc = bap.getMyVectorSrc();
      vDest = bap.getMyVectorDest();
      vEvent = bap.getMyVectorEvent();

  

         // This code is used to draw the vertical lines


            int width = (925/processmax) ;//10=processmax
         //   System.out.println(processmax);
            
            if(width < 60)
            {
                width = 70;
            }

            int height = 1690;

            int x1 = 30 ; //left
			int y1 = 50;  //top --- Constant value
			int x2 = 30 ; //right
			int y2 = height; //bottom
            int y3 = y1-Unit_Const2; //for process no. (Ex:P1)
            int x3 = x1-Unit_Const_pi; // x-cords for pi

			for (int i = 0;i <= processmax;i++)
			{
     		    vPoint1.add(new Point(x1,y1)); // store the x1,y1 in a vector
                vPoint2.add(new Point(x2,y2)); // store x2,y2 in a vector

                g2.setColor(Color.BLACK);
				g2.drawLine(x1, y1, x2, y2); // cordinates to draw individual vertical lines
				g2.setColor(Color.BLUE);
				g2.drawString("P"+i,x3 , y3);
				x1 = (x1 + width);
		     //   x2 = (x2 + width);
                x2 = x1;
                x3 = (x1 - Unit_Const2);


			}


code to draw horizontal lines

     for ( int i =0; i<vSrc.size();i++)
     {
         
          //these values are got from another class

         short vertexSrc = (Short)vSrc.elementAt(i);
         int vertexDest = (Short)vDest.elementAt(i);
         int vertexEvent = (Integer)vEvent.elementAt(i);

         if(vertexSrc < vertexDest)
         {
             Point p1 = (Point)vPoint1.elementAt(vertexSrc);
             Point p2 = (Point)vPoint2.elementAt(vertexDest);
             xa = p1.x;
             xb = p2.x - Unit_Const1;
             ya = ya + MAX_Horzspace;
             yb = ya;
        
         

         }

         else
         {
             Point p1 = (Point)vPoint1.elementAt(vertexSrc);
             Point p2 = (Point)vPoint2.elementAt(vertexDest);
             xa = p1.x;
             xb = p2.x + Unit_Const1;
             ya = ya + MAX_Horzspace ;
             yb = ya;
       
         }

                  
      arrow.drawArrow(g2,xa,ya,xb,yb,stroke);

     }
     
    }
    
      
}

public class MyAdjustmentListener implements AdjustmentListener{

DrawCanvas drc = new DrawCanvas();


    // This method is called whenever the value of a scrollbar is changed,
        // either by the user or programmatically.
        public void adjustmentValueChanged(AdjustmentEvent evt) {
            Adjustable source = evt.getAdjustable();

            // getValueIsAdjusting() returns true if the user is currently
            // dragging the scrollbar's knob and has not picked a final value
            if (evt.getValueIsAdjusting()) {

            DrawCanvas_UI dr = new DrawCanvas_UI();
            
        //    dr.drawPanel.repaint();
            dr.drawPanel.validate();
                
            return;
                
            }
             int orient = source.getOrientation();
    if (orient == Adjustable.HORIZONTAL) {
    //  System.out.println("from horizontal scrollbar");
    } else {
                 
    //  System.out.println("from vertical scrollbar");
    }
    
}


}




}

[Fubarable]

This is a multi-posted thread that has already been posted in the New to Java section. I will close this thread and ask the original poster not to multi-post.