Edytor graficzny a znikanie obiektów.

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Witam, mam za zadanie napisać edytor graficzny, którym można rysować linie, prostokąty itd. Poradziłem sobie ze zmianą figury do rysowania, lecz po każdym narysowaniu obiektu poprzedni znika. Próbowałem wstawiać współrzędne każdego z nich do tablice i potem pętlą je kolejno rysować ale nie wychodzi... proszę o analizę kodu i o pomoc :D

/*
 * NewJFrame.java
 *
 * Created on 19 listopad 2013, 11:51
 */

package javaapplication23;

import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;

/**
 *
 * @author  student
 */
public class NewJFrame extends javax.swing.JFrame {
 public int x,y,n;
public int x2, y2;
int funkcja=0;
int tab[]= new int[10];
int tab2[]= new int[10];
int tab3[]= new int[10];
int tab4[]= new int[10];

    private Object JLabel2;
    public class rysuj extends JPanel
    {
        private boolean jToggleButton1ActionPerformed;

        @Override
        protected void paintComponent(Graphics g)
        {

            super.paintComponent(g);
            for(int i=0;i<10;i++)
            {
            tab[i]=x;
            tab2[i]=y;
            tab3[i]=x2;
            tab4[i]=y2;
            }
            for(int i=0;i<10;i++){
            g.setColor(Color.black);
            if(funkcja==1)
            g.drawLine(tab[i],tab2[i],tab3[i],tab4[i]);
            else
            if(funkcja==2)
            g.drawRect(tab[i],tab2[i],tab3[i],tab4[i]);

            }

        }

    }
    public NewJFrame() {
        initComponents();
        rysuj q= new rysuj();
        this.add(q);
        q.setSize(10000,10000);
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jButton4 = new javax.swing.JButton();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();

        jLabel1.setText("jLabel1");

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        addMouseListener(new java.awt.event.MouseAdapter() {
            public void mousePressed(java.awt.event.MouseEvent evt) {
                formMousePressed(evt);
            }
            public void mouseReleased(java.awt.event.MouseEvent evt) {
                formMouseReleased(evt);
            }
        });
        addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {
            public void mouseMoved(java.awt.event.MouseEvent evt) {
                formMouseMoved(evt);
            }
        });

        jButton1.setText("jButton1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jButton2.setText("jButton2");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jButton3.setText("jButton3");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        jButton4.setText("jButton4");

        jLabel2.setText("jLabel2");

        jLabel3.setText("jLabel3");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jButton1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jButton2)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jButton3)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jButton4)
                .addContainerGap())
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(258, Short.MAX_VALUE)
                .addComponent(jLabel2)
                .addGap(40, 40, 40)
                .addComponent(jLabel3)
                .addGap(34, 34, 34))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1)
                    .addComponent(jButton2)
                    .addComponent(jButton3)
                    .addComponent(jButton4))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 242, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(jLabel3))
                .addGap(21, 21, 21))
        );

        pack();
    }// </editor-fold>

    private void formMousePressed(java.awt.event.MouseEvent evt) {
  x=evt.getX();
y=evt.getY();

    }

    private void formMouseReleased(java.awt.event.MouseEvent evt) {
       x2=evt.getX();
y2=evt.getY();
this.repaint();

    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
      for(int i=0;i<1;i++){
            System.out.println(tab[i]);
            System.out.println(tab2[i]);
            System.out.println(tab3[i]);
            System.out.println(tab4[i]);}

    }

    private void formMouseMoved(java.awt.event.MouseEvent evt) {
       jLabel2.setText("x:"+String.valueOf(evt.getX()));
        jLabel3.setText("y:"+String.valueOf(evt.getY()));
    }

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
        funkcja= 1;
    }

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
       funkcja=2;
    }

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

    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JButton jButton4;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    // End of variables declaration

}

dodanie znacznika <code class="java"> - fp

0

Co to jest?

        protected void paintComponent(Graphics g)
        {

            super.paintComponent(g);
            for(int i=0;i<10;i++)
            {
            tab[i]=x;
            tab2[i]=y;
            tab3[i]=x2;
            tab4[i]=y2;
            }
            for(int i=0;i<10;i++){
            g.setColor(Color.black);
            if(funkcja==1)
            g.drawLine(tab[i],tab2[i],tab3[i],tab4[i]);
            else
            if(funkcja==2)
            g.drawRect(tab[i],tab2[i],tab3[i],tab4[i]);

            }

        }

Przecież wszystkie elementy tablic są identyczne. Naprawdę rysujesz wielokrotnie jeden i ten sam obiekt.

0

W takim razie jak to poprawić?

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