Help With Displaying Pie Chart

Will you please describe the problem.

Your program works fine for one who doesn't know your precise requirement.

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.text.NumberFormat;

import java.awt.Color;

public class MortgageCalc_wk5 extends JFrame implements ActionListener {

private static final long serialVersionUID = 6;

private static final Rectangle rectangle = null;

//Set up panels for Frame

JPanel topPanel = new JPanel();

JPanel bottomPanel = new JPanel();

JPanel radioPanel = new JPanel();

JPanel grfxPanel = new JPanel();

//Set up Layout

FlowLayout flowLayout = new FlowLayout();

BorderLayout borderLayout = new BorderLayout();

//Radio Choice Style Buttons

JRadioButton Choice1 = new JRadioButton ("User Input", true);

JRadioButton Choice2 = new JRadioButton ("User Selection", false);

//Set up JLabels, JButtons, and JTextFields

JLabel amountLabel = new JLabel("Loan Amount");

JTextField loanField = new JTextField(7);

JLabel termLabel = new JLabel("Term(Yrs)");

JTextField termField = new JTextField(4);

JLabel rateLabel = new JLabel("Rate");

JTextField rateField = new JTextField(4);

JComboBox options = new JComboBox();

JLabel optionsLabel = new JLabel();

JButton calcButton = new JButton("Calculate");

JButton resetButton = new JButton("Reset");

JButton exitButton = new JButton("Exit");

JButton grfxButton = new JButton("Display Graphics");

JLabel paymentLabel = new JLabel("Monthly Payment =");

JTextField paymentField = new JTextField(6);

JLabel outputLabel = new JLabel("Loan Amoritization Chart");

JTextArea calcField = new JTextArea(10, 25);

JScrollPane scroll

= new JScrollPane(calcField, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,

JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);

ButtonGroup radioSelect = new ButtonGroup();

JLabel grfxLabel =new JLabel ("Graphic Chart");

JTextField grfxField = new JTextField ("Graphics");

//Default constructor

public MortgageCalc_wk5() {

super("Tony's Calculator - Week 5");

setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

setVisible(true);

//add ActionListeners

loanField.addActionListener(this);

termField.addActionListener(this);

rateField.addActionListener(this);

options.addActionListener(this);

calcButton.addActionListener(this);

grfxButton.addActionListener(this);

resetButton.addActionListener(this);

exitButton.addActionListener(this);

Choice1.addActionListener(this);

Choice2.addActionListener(this);

//Top Panel Layout

topPanel.setLayout(flowLayout);

topPanel.add(amountLabel);

topPanel.add(loanField);

radioSelect.add(Choice1);

radioSelect.add(Choice2);

topPanel.add(Choice1);

topPanel.add(Choice2);

//Loan Term Options For JComboBox

options.addItem("7 years @ 5.35%");

options.addItem("15 years @ 5.5%");

options.addItem("30 years @ 5.75%");

options.setEnabled(false);

topPanel.add(options);

topPanel.add(termLabel);

topPanel.add(termField);

topPanel.add(rateLabel);

topPanel.add(rateField);

topPanel.add(paymentLabel);

topPanel.add(paymentField);

paymentField.setEditable(false);

//Was Bottom Panel Now East Panel, Calculate Reset,Exit, and Display Buttons

bottomPanel.add(calcButton);

bottomPanel.add(resetButton);

bottomPanel.add(exitButton);

bottomPanel.add(grfxButton);

calcButton.setBackground(Color.blue);

resetButton.setBackground(Color.white);

exitButton.setBackground(Color.red);

calcField.setBackground(Color.orange);

grfxPanel.setBackground(Color.green);

grfxPanel.add(grfxField);

//add Container

Container pane = getContentPane();

pane.setLayout(borderLayout);

pane.add(topPanel, BorderLayout.NORTH);

pane.add(calcField, BorderLayout.WEST);

pane.add(grfxPanel, BorderLayout.SOUTH);

pane.add(bottomPanel, BorderLayout.EAST);

calcField.setLineWrap(true);

calcField.setWrapStyleWord(true);

calcField.setEditable(false);

pane.add(scroll);

scroll.setViewportView(calcField);

pack();

grfxPanel.setBounds(new Rectangle(0, 0, 400, 400));

}

//actionEvent Listeners

public void actionPerformed(ActionEvent event) {

Object source = event.getSource();

if (source == calcButton) {

startCalculations();

}

else if (source == resetButton) {

reset();

}

else if (source == grfxButton) {

chartPanel();

}

else if (source == exitButton) {

end();

}

else if (source == Choice1) {

options.setEnabled(false);

termField.setEnabled(true);

rateField.setEnabled(true);

}

else if (source == Choice2) {

options.setEnabled(true);

termField.setEnabled(false);

rateField.setEnabled(false);

}

}

public void chartPanel() {

JFrame grfxFrame = new JFrame();

grfxFrame.setSize(400, 300);

double[] values = new double[3];

String[] names = new String[3];

values[0] = 1;

names[0] = "Item 1";

values[1] = 2;

names[1] = "Item 2";

values[2] = 4;

names[2] = "Item 3";

grfxFrame.getContentPane().add(new ChartPanel(values, names, "title"));

grfxFrame.setVisible(true);

}

// public class ChartPanel extends JPanel {

class ChartPanel extends JPanel {

private static final long serialVersionUID = 6;

public double[] values;

public String[] names;

public String title;

public ChartPanel(double[] v, String[] n, String t) {

names = n;

values = v;

title = t;

}

public void paintComponent(Graphics g) {

super.paintComponent(g);

if (values == null || values.length == 0){

return;

}

double minValue = 0;

double maxValue = 0;

for (int i = 0; i < values.length; i++) {

if (minValue > values[i]){

minValue = values[i];

}

if (maxValue < values[i]){

maxValue = values[i];

}

}

Dimension d = getSize();

int clientWidth = d.width;

int clientHeight = d.height;

int barWidth = clientWidth / values.length;

Font titleFont = new Font("SansSerif", Font.BOLD, 20);

FontMetrics titleFontMetrics = g.getFontMetrics(titleFont);

Font labelFont = new Font("SansSerif", Font.PLAIN, 10);

FontMetrics labelFontMetrics = g.getFontMetrics(labelFont);

int titleWidth = titleFontMetrics.stringWidth(title);

int y = titleFontMetrics.getAscent();

int x = (clientWidth - titleWidth) / 2;

g.setFont(titleFont);

g.drawString(title, x, y);

int top = titleFontMetrics.getHeight();

int bottom = labelFontMetrics.getHeight();

if (maxValue == minValue){

return;

}

double scale = (clientHeight - top - bottom) / (maxValue - minValue);

y = clientHeight - labelFontMetrics.getDescent();

g.setFont(labelFont);

for (int i = 0; i < values.length; i++) {

int valueX = i * barWidth + 1;

int valueY = top;

int height = (int) (values[i] * scale);

if (values[i] >= 0){

valueY += (int) ((maxValue - values[i]) * scale);

}

else {

valueY += (int) (maxValue * scale);

height = -height;

}

g.setColor(Color.red);

g.fillRect(valueX, valueY, barWidth - 2, height);

g.setColor(Color.black);

g.drawRect(valueX, valueY, barWidth - 2, height);

int labelWidth = labelFontMetrics.stringWidth(names[i]);

x = i * barWidth + (barWidth - labelWidth) / 2;

g.drawString(names[i], x, y);

}

}

}

//Calculation Section

void startCalculations() {

NumberFormat currency = NumberFormat.getCurrencyInstance();

//Variables

double amount = 0;

double term = 0;

double interest = 0;

double moIn = 0;

double moTerm = 0;

double payment = 0;

double newPrin = amount;

boolean Exception = false;

//Input Validation

try {

amount = Double.parseDouble(loanField.getText());

} catch (NumberFormatException e) {

JOptionPane.showMessageDialog

(null, "Commas, Letters, and Puncuation NOT Allowed",

"Message Dialog", JOptionPane.ERROR_MESSAGE);

loanField.setText(null);

calcField.setText(null);

}

//User's Loan Choice

if (Choice2.isSelected()){

if(options.getSelectedIndex() == 0){

term=7;

interest=5.35;

}

else if(options.getSelectedIndex() ==1){

term=15;

interest=5.5;

}

else{

term=30;

interest=5.75;

}

}

else{

//More Validation

try{

term = Double.parseDouble(termField.getText());

}

catch (NumberFormatException e){

JOptionPane.showMessageDialog

(this,"Enter amounts greater than zero","Please enter new amount",

JOptionPane.ERROR_MESSAGE);

Exception=true;

termField.setText(null);

}

try{

interest= Double.parseDouble(rateField.getText());

}

catch (NumberFormatException e){

JOptionPane.showMessageDialog

(this, "Enter an Amount Greater Than Zero, % Not Allowed",

"Please enter Another Amount", JOptionPane.ERROR_MESSAGE);

Exception=true;

rateField.setText(null);

}

}

if ((amount <= 0 || term <= 0 || interest <= 0) && (Exception == false)) {

JOptionPane.showMessageDialog

(null, "Please Enter a Number Greater Than ZERO.",

"Message Dialog", JOptionPane.ERROR_MESSAGE);

if(amount <= 0)

loanField.setText(null);

paymentField.setText(null);

calcField.setText(null);

termField.setText(null);

rateField.setText(null);

}

//Amortization Results Chart

if (amount >7) {

amount = Double.parseDouble(loanField.getText());

moIn = (interest / 12) / 100;

moTerm = term * 12;

payment

= amount * (moIn / (1 - java.lang.Math.pow((1 + moIn), (-moTerm))));

paymentField.setText("" + currency.format(payment));

calcField.append("Period");

calcField.append("");

calcField.append("Payment Amount");

calcField.append("");

calcField.append("Interest Paid");

calcField.append("");

calcField.append("Principle Paid");

calcField.append("");

calcField.append("Loan Balance");

calcField.append("\n");

for (int i = 1; i <= moTerm; i++) {

double newIn = moIn * amount;

double reduct = payment - newIn;

newPrin = amount - reduct;

amount = newPrin;

calcField.append("" + i);

calcField.append("" + currency.format(payment));

calcField.append("" + currency.format(newIn));

calcField.append("" + currency.format(reduct));

calcField.append

("" + currency.format(newPrin) + "\n");

calcField.setCaretPosition(0);

}

}

}

// Program Reset, User Can Calculate Another Amount or Choose A Different Style

void reset () {

loanField.setText(null);

paymentField.setText(null);

calcField.setText(null);

termField.setText(null);

rateField.setText(null);

}

// Exit Command

void end() {

System.exit(0);

}

// main method

public static void main(String args[]) {

java.util.Locale.setDefault(java.util.Locale.US);

MortgageCalc_wk5 calc = new MortgageCalc_wk5();

calc.pack();

calc.setVisible(true);

}

}

// end of program

Message was edited by:

hiwa

hiwaa at 2007-7-9 5:34:02 >