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

/*
 * SimpleHypotheekApplet.java
 *
 * Created on 22-mei-2009, 15:36:10
 */


/**
 *
 *
 * Copyright (c) Wishnu Prasetya, 2009.
 */

package Hypotheek;

import java.awt.Color;
import java.awt.Graphics ;
import java.awt.Graphics2D ;
import java.awt.Stroke ;
import java.util.* ;
import static Hypotheek.Util.* ;

/**
 *
 * @author Wishnu Prasetya
 */
public class SimpleHypotheekApplet extends javax.swing.JApplet {

    /** Initializes the applet SimpleHypotheekApplet */
    public void init() {
        try {
            java.awt.EventQueue.invokeAndWait(new Runnable() {
                public void run() {
                    initComponents();
                }
            });
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

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

        jPanel4 = new javax.swing.JPanel();
        jSeparator8 = new javax.swing.JSeparator();
        jLabel10 = new javax.swing.JLabel();
        jLabel11 = new javax.swing.JLabel();
        jPanel3 = new javax.swing.JPanel();
        jTabbedPane1 = new javax.swing.JTabbedPane();
        jPanel1 = new javax.swing.JPanel();
        jLabel7 = new javax.swing.JLabel();
        jSeparator1 = new javax.swing.JSeparator();
        jLabel1 = new javax.swing.JLabel();
        loan_field = new javax.swing.JTextField();
        jLabel6 = new javax.swing.JLabel();
        duration_field = new javax.swing.JTextField();
        jLabel8 = new javax.swing.JLabel();
        interestRate_field = new javax.swing.JTextField();
        jLabel13 = new javax.swing.JLabel();
        jComboBox1 = new javax.swing.JComboBox();
        jLabel3 = new javax.swing.JLabel();
        monthlypay_field = new javax.swing.JTextField();
        jLabel9 = new javax.swing.JLabel();
        jSeparator2 = new javax.swing.JSeparator();
        jLabel5 = new javax.swing.JLabel();
        salary_field = new javax.swing.JTextField();
        jLabel2 = new javax.swing.JLabel();
        age_field = new javax.swing.JTextField();
        jSeparator3 = new javax.swing.JSeparator();
        jSeparator4 = new javax.swing.JSeparator();
        jLabel12 = new javax.swing.JLabel();
        year_to_show_field = new javax.swing.JTextField();
        jSeparator5 = new javax.swing.JSeparator();
        jSeparator6 = new javax.swing.JSeparator();
        jSeparator7 = new javax.swing.JSeparator();
        bereken_button = new javax.swing.JButton();
        jPanel2 = new javax.swing.JPanel();
        jLabel4 = new javax.swing.JLabel();
        housepriceGrowth_field = new javax.swing.JTextField();
        jLabel14 = new javax.swing.JLabel();
        purchaseOverheadPecentage = new javax.swing.JTextField();
        jLabel15 = new javax.swing.JLabel();
        premie_levenverz_field = new javax.swing.JTextField();
        jTabbedPane2 = new javax.swing.JTabbedPane();
        jScrollPane1 = new javax.swing.JScrollPane();
        overviewreport_area = new javax.swing.JTextArea();
        jScrollPane2 = new javax.swing.JScrollPane();
        yearreport_area = new javax.swing.JTextArea();
        graph_area = new javax.swing.JPanel();

        jPanel4.setBackground(new java.awt.Color(153, 153, 255));
        jPanel4.setLayout(new java.awt.GridLayout(4, 0));

        jSeparator8.setBackground(new java.awt.Color(153, 153, 255));
        jSeparator8.setForeground(new java.awt.Color(153, 153, 255));
        jPanel4.add(jSeparator8);

        jLabel10.setFont(new java.awt.Font("Arial", 1, 18));
        jLabel10.setForeground(new java.awt.Color(204, 204, 255));
        jLabel10.setText("  Hypotheek X-press-Calculator (2009)");
        jPanel4.add(jLabel10);
        jLabel10.getAccessibleContext().setAccessibleName("Hypotheek X-press-Calculator ");

        jLabel11.setFont(new java.awt.Font("Arial", 2, 10));
        jLabel11.setForeground(new java.awt.Color(153, 204, 255));
        jLabel11.setText("        Copyright (c) W. Prasetya, 2009");
        jPanel4.add(jLabel11);

        getContentPane().add(jPanel4, java.awt.BorderLayout.NORTH);

        jPanel3.setBackground(new java.awt.Color(204, 204, 255));
        jPanel3.setFont(new java.awt.Font("Arial", 0, 12));
        jPanel3.setMinimumSize(new java.awt.Dimension(800, 400));
        jPanel3.setPreferredSize(new java.awt.Dimension(800, 400));
        jPanel3.setLayout(new javax.swing.BoxLayout(jPanel3, javax.swing.BoxLayout.LINE_AXIS));

        jTabbedPane1.setBackground(new java.awt.Color(204, 204, 255));
        jTabbedPane1.setFont(new java.awt.Font("Arial", 0, 12));
        jTabbedPane1.setMinimumSize(new java.awt.Dimension(300, 400));
        jTabbedPane1.setPreferredSize(new java.awt.Dimension(300, 400));

        jPanel1.setBackground(new java.awt.Color(204, 204, 255));
        jPanel1.setFont(new java.awt.Font("Arial", 0, 12));
        jPanel1.setLayout(new java.awt.GridLayout(14, 0));

        jLabel7.setFont(new java.awt.Font("Arial", 1, 12));
        jLabel7.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jLabel7.setText("  Leninggegevens:");
        jLabel7.setHorizontalTextPosition(javax.swing.SwingConstants.LEFT);
        jPanel1.add(jLabel7);

        jSeparator1.setBackground(new java.awt.Color(204, 204, 255));
        jSeparator1.setForeground(new java.awt.Color(204, 204, 255));
        jPanel1.add(jSeparator1);

        jLabel1.setFont(new java.awt.Font("Arial", 0, 12));
        jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jLabel1.setText("     Lening (euro)");
        jLabel1.setHorizontalTextPosition(javax.swing.SwingConstants.LEFT);
        jPanel1.add(jLabel1);

        loan_field.setColumns(8);
        loan_field.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
        loan_field.setText("100000");
        jPanel1.add(loan_field);

        jLabel6.setFont(new java.awt.Font("Arial", 0, 12));
        jLabel6.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jLabel6.setText("     Leenperiode (jaar)");
        jPanel1.add(jLabel6);

        duration_field.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
        duration_field.setText("30");
        jPanel1.add(duration_field);

        jLabel8.setFont(new java.awt.Font("Arial", 0, 12));
        jLabel8.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jLabel8.setText("     Jaarrente (in %)");
        jPanel1.add(jLabel8);

        interestRate_field.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
        interestRate_field.setText("5.10");
        jPanel1.add(interestRate_field);

        jLabel13.setFont(new java.awt.Font("Arial", 0, 12));
        jLabel13.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jLabel13.setText("     Hypotheekvorm");
        jPanel1.add(jLabel13);

        jComboBox1.setFont(new java.awt.Font("Arial", 0, 12));
        jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Annuiteitenhypotheek", "Spaarhypotheek" }));
        jComboBox1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jComboBox1ActionPerformed(evt);
            }
        });
        jPanel1.add(jComboBox1);

        jLabel3.setFont(new java.awt.Font("Arial", 0, 12));
        jLabel3.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jLabel3.setText("     Uw maandelijks betaling ");
        jLabel3.setToolTipText("Bedrag die u per maand kan/wil betalen (in euro)");
        jPanel1.add(jLabel3);

        monthlypay_field.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
        monthlypay_field.setText("800");
        monthlypay_field.setToolTipText("Bedrag die u per maand kan/wil betalen (in euro)");
        jPanel1.add(monthlypay_field);

        jLabel9.setFont(new java.awt.Font("Arial", 1, 12));
        jLabel9.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jLabel9.setText("  Uw gegevens:");
        jPanel1.add(jLabel9);

        jSeparator2.setBackground(new java.awt.Color(204, 204, 255));
        jSeparator2.setForeground(new java.awt.Color(204, 204, 255));
        jPanel1.add(jSeparator2);

        jLabel5.setFont(new java.awt.Font("Arial", 0, 12));
        jLabel5.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jLabel5.setText("     Uw bruto jaarsalaris");
        jPanel1.add(jLabel5);

        salary_field.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
        salary_field.setText("20000");
        jPanel1.add(salary_field);

        jLabel2.setFont(new java.awt.Font("Arial", 0, 12));
        jLabel2.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jLabel2.setText("     Leeftijd (jaar)");
        jPanel1.add(jLabel2);

        age_field.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
        age_field.setText("30");
        jPanel1.add(age_field);

        jSeparator3.setBackground(new java.awt.Color(204, 204, 255));
        jSeparator3.setForeground(new java.awt.Color(204, 204, 255));
        jPanel1.add(jSeparator3);

        jSeparator4.setBackground(new java.awt.Color(204, 204, 255));
        jSeparator4.setForeground(new java.awt.Color(204, 204, 255));
        jPanel1.add(jSeparator4);

        jLabel12.setFont(new java.awt.Font("Arial", 0, 12));
        jLabel12.setText("  Toon details van jaar:");
        jLabel12.setToolTipText("Uw aflossing van dit jaar wordt in details in de \"Jaar details\"-tab aangetoond.");
        jPanel1.add(jLabel12);

        year_to_show_field.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
        year_to_show_field.setText("1");
        year_to_show_field.setToolTipText("Uw aflossing van dit jaar wordt in details in de \"Jaar details\"-tab aangetoond.");
        jPanel1.add(year_to_show_field);

        jSeparator5.setBackground(new java.awt.Color(204, 204, 255));
        jSeparator5.setForeground(new java.awt.Color(204, 204, 255));
        jPanel1.add(jSeparator5);

        jSeparator6.setBackground(new java.awt.Color(204, 204, 255));
        jSeparator6.setForeground(new java.awt.Color(204, 204, 255));
        jPanel1.add(jSeparator6);

        jSeparator7.setBackground(new java.awt.Color(204, 204, 255));
        jSeparator7.setForeground(new java.awt.Color(204, 204, 255));
        jPanel1.add(jSeparator7);

        bereken_button.setBackground(new java.awt.Color(153, 153, 255));
        bereken_button.setFont(new java.awt.Font("Arial", 1, 12));
        bereken_button.setText("Bereken");
        bereken_button.setBorder(new javax.swing.border.SoftBevelBorder(javax.swing.border.BevelBorder.RAISED));
        bereken_button.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bereken_buttonActionPerformed(evt);
            }
        });
        jPanel1.add(bereken_button);

        jTabbedPane1.addTab("Gegevens", jPanel1);

        jPanel2.setBackground(new java.awt.Color(204, 204, 255));
        jPanel2.setFont(new java.awt.Font("Arial", 0, 12));

        jLabel4.setFont(new java.awt.Font("Arial", 0, 12));
        jLabel4.setText("Verwachte huisprijs groei (in %)");
        jLabel4.setToolTipText("Verwachte jaarlijksgroei (in %) van huisprijs. Dit wordt gebruikt in uw winst berekening.");

        housepriceGrowth_field.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
        housepriceGrowth_field.setText("2.00");
        housepriceGrowth_field.setToolTipText("Verwachte jaarlijksgroei (in %) van huisprijs. Dit wordt gebruikt in uw winst berekening.");

        jLabel14.setFont(new java.awt.Font("Arial", 0, 12));
        jLabel14.setText("Bijkomende koopkosten (%)");
        jLabel14.setToolTipText("Overdrachtsbelasting, makelaarkosten, enz, die u ook uit de lening laat bekostigen. Rente over deze kosten is niet belastingaftrekbaar.");

        purchaseOverheadPecentage.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
        purchaseOverheadPecentage.setText("10");
        purchaseOverheadPecentage.setToolTipText("Overdrachtsbelasting, makelaarkosten, enz, die u ook uit de lening laat bekostigen. Rente over deze kosten is niet belastingaftrekbaar.");

        jLabel15.setFont(new java.awt.Font("Arial", 0, 12)); // NOI18N
        jLabel15.setText("Premie levensverz. (eur/maand)");

        premie_levenverz_field.setHorizontalAlignment(javax.swing.JTextField.RIGHT);
        premie_levenverz_field.setText("0");

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addGap(16, 16, 16)
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 195, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel14, javax.swing.GroupLayout.PREFERRED_SIZE, 172, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel15))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(premie_levenverz_field, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 63, Short.MAX_VALUE)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                        .addComponent(purchaseOverheadPecentage, javax.swing.GroupLayout.Alignment.TRAILING)
                        .addComponent(housepriceGrowth_field, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 42, Short.MAX_VALUE)))
                .addGap(67, 67, 67))
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel4, javax.swing.GroupLayout.PREFERRED_SIZE, 41, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(housepriceGrowth_field, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(purchaseOverheadPecentage, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel14, javax.swing.GroupLayout.PREFERRED_SIZE, 28, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel15)
                    .addComponent(premie_levenverz_field, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(430, 430, 430))
        );

        jTabbedPane1.addTab("Meer opties", jPanel2);

        jPanel3.add(jTabbedPane1);

        jTabbedPane2.setBackground(new java.awt.Color(204, 204, 255));
        jTabbedPane2.setFont(new java.awt.Font("Arial", 0, 12));
        jTabbedPane2.setMinimumSize(new java.awt.Dimension(500, 400));
        jTabbedPane2.setPreferredSize(new java.awt.Dimension(500, 400));

        overviewreport_area.setColumns(20);
        overviewreport_area.setFont(new java.awt.Font("Monospaced", 0, 12));
        overviewreport_area.setForeground(new java.awt.Color(51, 51, 51));
        overviewreport_area.setRows(5);
        jScrollPane1.setViewportView(overviewreport_area);

        jTabbedPane2.addTab("Rapport", jScrollPane1);

        jScrollPane2.setBackground(new java.awt.Color(255, 255, 255));

        yearreport_area.setColumns(20);
        yearreport_area.setFont(new java.awt.Font("Monospaced", 0, 12));
        yearreport_area.setRows(5);
        jScrollPane2.setViewportView(yearreport_area);

        jTabbedPane2.addTab("Jaar details", jScrollPane2);

        graph_area.setBackground(new java.awt.Color(255, 255, 255));
        graph_area.addComponentListener(new java.awt.event.ComponentAdapter() {
            public void componentShown(java.awt.event.ComponentEvent evt) {
                graph_areaComponentShown(evt);
            }
        });

        javax.swing.GroupLayout graph_areaLayout = new javax.swing.GroupLayout(graph_area);
        graph_area.setLayout(graph_areaLayout);
        graph_areaLayout.setHorizontalGroup(
            graph_areaLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 544, Short.MAX_VALUE)
        );
        graph_areaLayout.setVerticalGroup(
            graph_areaLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 537, Short.MAX_VALUE)
        );

        jTabbedPane2.addTab("Grafiek", graph_area);

        jPanel3.add(jTabbedPane2);

        getContentPane().add(jPanel3, java.awt.BorderLayout.CENTER);
    }// </editor-fold>//GEN-END:initComponents

    private void bereken_buttonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_bereken_buttonActionPerformed
        int selectedYearToReport ;
        try {
            H.setLoan(euro2cent(parse_IntegralInput(loan_field.getText(),"lening",1,div(Hypotheek.MAX_LOAN,100)))) ;
            H.setDuration(12 * parse_IntegralInput(duration_field.getText(),"leenperiode",1,div(Hypotheek.MAX_LOAN_DURATION,12))) ;
            H.setMonthlyPayment(euro2cent(parse_IntegralInput(monthlypay_field.getText(),"maandelijks bedrag",1,div(Hypotheek.MAX_LOAN,100)))) ;
            H.setIncome(euro2cent(parse_IntegralInput(salary_field.getText(),"salaris",1,div(Hypotheek.MAX_LOAN,100)))) ;
            H.setAge(parse_IntegralInput(age_field.getText(),"leeftijd",0,Hypotheek.MAX_AGE)) ;

            selectedYearToReport = parse_IntegralInput(year_to_show_field.getText()
                        ,"opgegeven jaar om in details te raporteren",1,div(H.duration,12)) ;

            float x ;
            x = parse_Float2DigInput(interestRate_field.getText(),"rente",0f,
                    toFloat(div(Hypotheek.MAX_INTEREST_RATE,100))) ;
            H.setIterest(toInt(x * 100f));
            x = parse_Float2DigInput(housepriceGrowth_field.getText(),"gegeven groei-percentage van huisprijs",0f,
                    toFloat(div(Hypotheek.MAX_INTEREST_RATE,100))) ;
            H.setAssumedHousePriceIncrRate(toInt(x * 100f));
            x = parse_Float2DigInput(purchaseOverheadPecentage.getText(), "percentage van bijkomende koopkosten",0f,100f) ;
            H.setPurchaseCostPerctage(toInt(x * 100));

            H.setLifeInsurancePremium(euro2cent(parse_IntegralInput(premie_levenverz_field.getText(),
                    "premie van levensverzekering",0,Hypotheek.MAX_LOAN)
                    )) ;
        }
        catch (NumberFormatException e) { return ; }

        R = H.calculate() ;
        String overviewReport = H.printGenStatistics(R) ;
        overviewreport_area.setForeground(Color.BLACK);
        overviewreport_area.setText(overviewReport) ;
        if (R != null) {
            String yearReport = H.printYearReport(R,selectedYearToReport) ;
            yearreport_area.setText(yearReport);
        }
        plotGraph() ;
    }//GEN-LAST:event_bereken_buttonActionPerformed

    private void graph_areaComponentShown(java.awt.event.ComponentEvent evt) {//GEN-FIRST:event_graph_areaComponentShown
        repaint() ;
    }//GEN-LAST:event_graph_areaComponentShown

    private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jComboBox1ActionPerformed
        String selected_hypform = (String) ((javax.swing.JComboBox)evt.getSource()).getSelectedItem() ;
        if (selected_hypform.equals("Spaarhypotheek")) H.switchToPureSpaarHypotheek();
        if (selected_hypform.equals("Annuiteitenhypotheek")) H.setPercentageToSave(0);
    }//GEN-LAST:event_jComboBox1ActionPerformed

    Hypotheek.Result R = null ;
    Hypotheek H = new Hypotheek() ;

    private int parse_IntegralInput(String input, String msg, int minval, int maxval )
        throws NumberFormatException
    {
        int x ;
        try { x = parseInt(input,minval,maxval) ; }
        catch (NumberFormatException e) {
            overviewreport_area.setForeground(Color.RED);
            overviewreport_area.setText("** FOUT in uw invoer: uw "
                      + msg + " moet een geheel getal (zonder punt of comma) tussen "
                      + minval
                      + " en "
                      + maxval + " zijn.") ;
            throw e ;
        }
       return x ;
    }

    // parsing float, with rounded to 2 digits behind the comma
    private float parse_Float2DigInput(String input, String msg, float minval, float maxval )
        throws NumberFormatException
    {
        float x ;
        try { x = parseFloat(input,minval,maxval) ; }
        catch (NumberFormatException e) {
            overviewreport_area.setForeground(Color.RED);
            overviewreport_area.setText("** FOUT in uw invoer: uw "
                      + msg + " moet een getal tussen "
                      + minval
                      + " en "
                      + maxval + " zijn.") ;
            throw e ;
        }
       return x ;
    }

   public void paint(Graphics g) {
       super.paint(g) ;
       plotGraph() ;
   }

    static int GRAPH_WIDTH = 400 ;
    static int GRAPH_HEIGHT = 200 ;
    static int TOP_MARGIN = 50 ;
    static int LEFT_MARGIN = 80 ;
    static int SEP = 8 ;

    private void plotGraph() {

        if (! graph_area.isShowing()) return ;

        Graphics2D g = (Graphics2D) graph_area.getGraphics() ;
        g.clearRect(0,0,graph_area.getWidth(),graph_area.getHeight());

        if (R == null) return ;
        
        List<Integer> cummulativeLoanPaid = H.calcYearlyCummulativeProgressOfLoanPaid(R) ;
        List<Integer> cummulativeSaving = H.calcYearlyCummulativeProgressOfSaving(R) ;
        List<Integer> cummulativeTaxReduction = H.calcYearlyCummulativeProgressOfTaxReduction(R) ;

        //System.out.println(">>>" + cummulativeLoanPaid + " size " + cummulativeLoanPaid.size()) ;
        //System.out.println(">>>" + cummulativeSaving + " size " + cummulativeSaving.size()) ;

        assert cummulativeLoanPaid.size() ==  cummulativeSaving.size() ;

        assert cummulativeLoanPaid.size() == cummulativeTaxReduction.size() ;

        int N = cummulativeLoanPaid.size() ;

        int loan = H.loan ;

        List<Float> line1 = new LinkedList<Float>() ;
        for (int i=0; i<N; i++) {
            Float val = toFloat(loan - cummulativeLoanPaid.get(i) - cummulativeSaving.get(i))
                / toFloat(loan) ;
            line1.add(val) ;
        }
         
        List<Float> line2 = new LinkedList<Float>() ;
        for (int tr : cummulativeTaxReduction) {
            Float val = toFloat(tr) / toFloat(loan) ;
            line2.add(val) ;
        }

        List<Float> line3 = new LinkedList<Float>() ;
        float growth = 1f + toFloat(H.assumedHousePriceIncrRate) / 10000f ;
        for (int m=0; m<N; m++) {
            Float house_value = cummulativeGrowth(H.getHousePurchaseValue(),growth,toFloat(m)/12f) ;
            Float val = house_value / toFloat(loan) ;
            line3.add(val) ;
        }

        int loan_height = toInt(0.9f * toFloat(GRAPH_HEIGHT)) ;

        // Drawing the loan-line
        //g.setColor(Color.BLUE) ;
        //drawLine(g,0,loan_height,GRAPH_WIDTH,loan_height) ;

        // Drawing the cummulative part of the loan that still remains (minus saving)
        int deltaX = div(GRAPH_WIDTH,N) ;

        int xprev = 0 ;
        int yprev = loan_height ;
        int year = 1 ;
        for (Float hp : line1) {
            int x = xprev + deltaX ;
            int y = toInt(hp * toFloat(loan_height)) ;
            g.setColor(Color.RED) ;
            drawLine(g,xprev,yprev,x,y) ;
            if (year % 5 == 0) {
                g.setColor(Color.BLACK) ;
                drawStr(g,"" + year, x-4, - 2*SEP) ;
            }
            xprev = x ; yprev = y ;
            year++ ;
        }

        // Drawing the cummulative tax reduction:
        xprev = 0 ;
        yprev = 0 ;
        g.setColor(Color.GREEN) ;
        for (Float hp : line2) {
            int x = xprev + deltaX ;
            int y = toInt(hp * toFloat(loan_height)) ;
            drawLine(g,xprev,yprev,x,y) ;
            xprev = x ; yprev = y ;

        }

        // Drawing the x and y axis:
        g.setColor(Color.BLACK) ;
        drawLine(g,0,0,GRAPH_WIDTH,0) ;
        drawLine(g,-1,-1,GRAPH_WIDTH,-1) ;
        //drawLine(g,0,-2,GRAPH_WIDTH,-2) ;
        drawLine(g,0,0,0,GRAPH_HEIGHT) ;
        drawLine(g,-1,0,-1,GRAPH_HEIGHT) ;
        //drawLine(g,-2,0,-2,GRAPH_HEIGHT) ;

        // drawing the growth of house value:
        // Drawing the cummulative tax reduction:
        xprev = 0 ;
        yprev = toInt(toFloat(loan_height) * toFloat(H.getHousePurchaseValue()) / toFloat(loan))  ;
        g.setColor(Color.BLUE) ;
        for (Float hp : line3) {
            int x = xprev + deltaX ;
            int y = toInt(hp * toFloat(loan_height)) ;
            drawLine(g,xprev,yprev,x,y) ;
            xprev = x ; yprev = y ;
        }

        float deltaY = 0.25f ;
        float yp = deltaY ;
        g.setColor(Color.BLACK) ;
        for (int i=0; i<4; i++ ) {
            int yval = euro2cent(toInt(yp * toFloat(H.loan) / 100000f)) ;
            int y = toInt(yp * toFloat(loan_height)) ;
            drawStr(g,"" + yval, - 6*SEP, y) ;
            yp += deltaY ;
        }

        drawStr(g,"( x 1000 eur.)",-7*SEP, GRAPH_HEIGHT + 2*SEP) ;
        drawStr(g,"(jaar)",GRAPH_WIDTH + 3*SEP, - 2*SEP) ;
        //g.setColor(Color.BLUE) ;
        //drawStr(g,"uw lening",GRAPH_WIDTH/2 - 5*SEP, loan_height + SEP) ;

        g.setColor(Color.RED) ;
        drawLine(g,0,-5*SEP,8*SEP,-5*SEP) ;
        drawStr(g,"Overgeblevende lening",9*SEP,-5*SEP) ;
        g.setColor(Color.BLUE) ;
        drawLine(g,0,-7*SEP,8*SEP,-7*SEP) ;
        drawStr(g,"Huisprijs ontwikkeling",9*SEP,-7*SEP) ;
        g.setColor(Color.GREEN) ;
        drawLine(g,0,-9*SEP,8*SEP,-9*SEP) ;
        drawStr(g,"Uw cummulatief belastingvoordeel",9*SEP,-9*SEP) ;



    }

    private void drawLine(Graphics2D g, int x1, int y1, int x2, int y2) {
        g.drawLine(LEFT_MARGIN + x1
                ,TOP_MARGIN + (GRAPH_HEIGHT - y1)
                ,LEFT_MARGIN + x2
                ,TOP_MARGIN + (GRAPH_HEIGHT - y2) ) ;
    }

    private void drawStr(Graphics2D g, String s, int x, int y) {
        g.drawString(s, LEFT_MARGIN + x, TOP_MARGIN + (GRAPH_HEIGHT - y));
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JTextField age_field;
    private javax.swing.JButton bereken_button;
    private javax.swing.JTextField duration_field;
    private javax.swing.JPanel graph_area;
    private javax.swing.JTextField housepriceGrowth_field;
    private javax.swing.JTextField interestRate_field;
    private javax.swing.JComboBox jComboBox1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel10;
    private javax.swing.JLabel jLabel11;
    private javax.swing.JLabel jLabel12;
    private javax.swing.JLabel jLabel13;
    private javax.swing.JLabel jLabel14;
    private javax.swing.JLabel jLabel15;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JLabel jLabel7;
    private javax.swing.JLabel jLabel8;
    private javax.swing.JLabel jLabel9;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JPanel jPanel3;
    private javax.swing.JPanel jPanel4;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JSeparator jSeparator1;
    private javax.swing.JSeparator jSeparator2;
    private javax.swing.JSeparator jSeparator3;
    private javax.swing.JSeparator jSeparator4;
    private javax.swing.JSeparator jSeparator5;
    private javax.swing.JSeparator jSeparator6;
    private javax.swing.JSeparator jSeparator7;
    private javax.swing.JSeparator jSeparator8;
    private javax.swing.JTabbedPane jTabbedPane1;
    private javax.swing.JTabbedPane jTabbedPane2;
    private javax.swing.JTextField loan_field;
    private javax.swing.JTextField monthlypay_field;
    private javax.swing.JTextArea overviewreport_area;
    private javax.swing.JTextField premie_levenverz_field;
    private javax.swing.JTextField purchaseOverheadPecentage;
    private javax.swing.JTextField salary_field;
    private javax.swing.JTextField year_to_show_field;
    private javax.swing.JTextArea yearreport_area;
    // End of variables declaration//GEN-END:variables

}