scrollbar issue

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

Code:

/* * 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"); } } } }