Add viewport to jpanel

Question

i am really confused regarding the size of my Jpanel(it change as the frame, it shouldn t)
and the implementation of a view port with
could you help me is really important i have submission on monday
pls
package help;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import javax.swing.*;
public abstract class MyFrame extends JFrame {
private static final long serialVersionUID = 1L;
private static JButton drawCircle, drawRectangle, drawSquare, drawStar, start, clear,quit,back, screenshoot;
static final int FPS_MIN = 0;
static final int FPS_MAX = 150;
static final int FPS_INIT = 0;
static int fps;
double x1,x2;
double y1,y2;
int dr =1;
int dy= 1;
int Selection=0;
boolean click=true; //check if start has been clicked
int width = java.awt.Toolkit.getDefaultToolkit().getScreenSize().width;  // screen width
int height = java.awt.Toolkit.getDefaultToolkit().getScreenSize().height;     //screen higth
protected static int count;
int R,G,B;  //color
Cursor c;                    //cursor object
private static ShapePanel bpnl;
public MyFrame()
        R=G=B=0;
        int width = java.awt.Toolkit.getDefaultToolkit().getScreenSize().width;
        int height = java.awt.Toolkit.getDefaultToolkit().getScreenSize().height-100;
        JFrame frame=new JFrame();
        BorderLayout layout=new BorderLayout();
        frame.setLayout(layout);
        frame.setTitle("Game");
        //panel to hold buttons
        JPanel upPanel = new JPanel();
        upPanel.setLayout(new FlowLayout());
        upPanel.setSize(width, height/5);
        //panel to hold SLIDERS
        JPanel leftPanel = new JPanel();
        leftPanel.setLayout(new BoxLayout(leftPanel, BoxLayout.Y_AXIS));
        leftPanel.setSize(50, height);
        //initialize buttons and add to the upPanel
        drawCircle=new JButton("Draw Circle");
        upPanel.add(drawCircle);
        drawStar=new JButton("Draw Star");
        upPanel.add(drawStar);
        drawRectangle=new JButton("Draw Rectangle");
        upPanel.add(drawRectangle);
        drawSquare=new JButton("Draw Square");
        upPanel.add(drawSquare);
        start=new JButton("Start");
        start.setBackground(Color.GREEN);
        //upPanel.add(start);
        clear=new JButton("Clear");
        upPanel.add(clear);
        back=new JButton("Back");
        upPanel.add(back);
        quit=new JButton("Quit");
        quit.setBackground(Color.red);
        upPanel.add(quit);  
        screenshoot=new JButton("ScreenShoot");
        c = new Cursor (Cursor.CROSSHAIR_CURSOR);     //Change cursor to cross hair
     this.setCursor (c);
        //new object spanel to hold TIMER
        JPanel spanel=new JPanel();
            spanel.setLayout(new GridLayout());
            //slider dimension construction
            JSlider sDimension = new JSlider(JSlider.HORIZONTAL,FPS_MIN, FPS_MAX, FPS_INIT);
            sDimension.setMajorTickSpacing(30);
            sDimension.setMinorTickSpacing(3);
            sDimension.setPaintTicks(true);
            sDimension.setPaintLabels(true);
            Font font = new Font("Serif", Font.ITALIC, 15);
            sDimension.setFont(font);
            sDimension.setBorder(BorderFactory.createTitledBorder("Shape Dimension"));
            //slider speed construction
            int FPS_MIN_s = 0;
            int FPS_MAX_s = 60;
            int FPS_INIT_s = 0;    //initial frames per second
            JSlider sSpeed = new JSlider(JSlider.HORIZONTAL,FPS_MIN_s, FPS_MAX_s, FPS_INIT_s);
            sSpeed.setBorder(BorderFactory.createTitledBorder("Shape Speed"));
         ////////////////////////// // slider colors////////////////////////////////////////////////////
            int FPS_MIN_C = 0;
            int FPS_MAX_C = 250;
            int FPS_INIT_C = 0;  
            JSlider sliderR= new JSlider(JSlider.HORIZONTAL,FPS_MIN_C, FPS_MAX_C, FPS_INIT_C);
            sliderR.setBorder(BorderFactory.createTitledBorder("Red Channel"));
            JSlider sliderG= new JSlider(JSlider.HORIZONTAL,FPS_MIN_C, FPS_MAX_C, FPS_INIT_C);
            sliderG.setMajorTickSpacing(50);
            sliderG.setMinorTickSpacing(25);
            sliderG.setPaintTicks(true);
            sliderG.setPaintLabels(true);
            sliderG.setFont(font);
            sliderG.setBorder(BorderFactory.createTitledBorder("Green Channel"));
            JSlider sliderB= new JSlider(JSlider.HORIZONTAL,FPS_MIN_C, FPS_MAX_C, FPS_INIT_C);
            sliderB.setBorder(BorderFactory.createTitledBorder("Blue Channel"));
          //     spanel.add(sSpeed,BorderLayout.EAST);
              frame.add(upPanel,BorderLayout.NORTH);
              frame.add(leftPanel,BorderLayout.WEST);
              bpnl = new ShapePanel(3000,3000);
                    System.out.println("panel width = "+bpnl.getWidth() +"  heigth = " + bpnl.getHeight());
                    bpnl.setFocusable(true);
              upPanel.setBackground(Color.DARK_GRAY);
              upPanel.setBorder(BorderFactory.createLineBorder(Color.white));
        frame.add(spanel,BorderLayout.SOUTH);       
        frame.add(bpnl, BorderLayout.CENTER);
        frame.setSize(width, height);
        frame.setVisible(true);               
           leftPanel.add(sliderR);
           leftPanel.add(sliderB);
           leftPanel.add(sliderG);
           leftPanel.add(sDimension,BorderLayout.WEST); 
             System.out.println("panel width = "+bpnl.getWidth() +"  heigth = " + bpnl.getHeight());
          public static  int getPanelWidth()
              System.out.println("panel width   "+bpnl.getWidth());
              return bpnl.getWidth();
          public static  int getPanelHeigth()
              System.out.println("Panel heigth  " +bpnl.getHeight());
              return bpnl.getHeight();
          public static void main(String args[])
              new MyFrame() {};
package help;
import java.awt.Cursor;
import java.awt.Graphics;
import javax.swing.JPanel;
class ShapePanel extends JPanel  {
     private static final long serialVersionUID = 1L;
     private javax.swing.Timer animationTmr;
     private float heigth;
     private float width;
     private Cursor c;
     public ShapePanel(int w, int h) {
                int W=w;
                int H=h;
                c = new Cursor (Cursor.CROSSHAIR_CURSOR);     //Change cursor to cross hair
                this.setCursor (c); 
                this.setPreferredSize(3000,3000);
     public void paintComponent(Graphics g) {
          super.paintComponent(g);
          g.fillRect(0, 0, this.getWidth(), this.getHeight());
    private void setPreferredSize(int i, int i0) {
    thanks

Answer 1

a simple way
jScrollPane.removeMouseWheelListener(jScrollPane.getMouseWheelListeners()[0]);but if you want to retain the mouseWheelListener, add a mouseListener to the scrollPane,
and in the same method as your panel's code (mousePressed) dispatch the event to the panel