Charts and Reading Files

Next of all, are you supposed to be mixing awt and swing components. I'm no GUI expert, but what I've learned from the forums is that most suggest that you shouldn't mix the two, and in fact most stick with just swing components.

It almost looks to me like part of your program was created by one person (your instructor?) and another part created by someone else (you? -- the pie chart?) If that's correct, I think you should stick to swing components (jlabel, jbutton, jtextfields, etc).

petes1234a at 2007-7-12 10:05:03 >

A couple of things strike me: Firstly, you have declared buttons and you have given them all different action listeners. Could you do something like:

JButton temp = (JButton) e.getSource();

if (temp.equals(calculateButton) {

}

etc.

I am not sure why you want to read in a text file if you are asking users to enter the figures on the screen. Why not just calculate what they enter?

An earlier reply was right about you needing to put the painting stuff in paintComponent and then calling repaint() when a button is clicked. However, I can't see anything that would call actionPerformed in the pie chart class, and you want something outside the class to call the repaint anyway.

Tavea at 2007-7-12 10:05:03 >

Thank you all for your help. I got the pie to display though it still does not display the current figures (I want it to display the total interest paid and total principal paid but that is not a concern of mine right now).

However, the pie chart is a teeny little thing and I don't know why. Can anyone solve this mystery for me? I just don't get why it is so tiny.

I'm only reposting my code since it changed and to answer my follow-up question you will need to see it. I don't feel a new thread is necessary since this is a follow-up to my previous question. There are two files for this to work. I know it is a bit messy.

Thank you again for your help and feedback!

Christy

import java.awt.*;

import java.awt.geom.*;

import java.awt.event.*;

import javax.swing.*;

import java.text.*;

import java.io.*;

import java.util.*;

public class MortgageCalculationsWeek5 extends JPanel

{

//Initialize variables

JFramemainFrame;

JButton calculateButton, clearButton, exitButton, pieButton;

JTextField principalField, interestField, termField, monthlyField, termResult, interestResult, interestPaidField, principalPaidField;

JTextArea displayArea;

JScrollPane displayPane;

JLabel principalLabel, termLabel, interestLabel, interestRateLabel, TermLabel, monthlyLabel, intPaidLabel, priPaidLabel;

JLabelintructionLabel1, intructionLabel2, intructionLabel3, intructionLabel4, intructionLabel5, intructionLabel6;

JPanel mainPanel, buttonPanel, titlePanel, basePanel, piePanel;

JComboBox termCombo, interestCombo;

Pie pie;

String principalString, interestString, termString, interestBox, termYears;

String pie1, pie2;

double principalAmt, loanInterest, loanTerm, monthlyPayment, interestPayment, principalPayment, remainingBalance, months, monthlyInt, totalInterest, totalPrincipal, totalInterestPaid, totalPrincipalPaid;

int[] inputs;

public static void main (String[] args)

{

javax.swing.SwingUtilities.invokeLater(

new Runnable() {

public void run() {

new MortgageCalculationsWeek5();

}

}

);

}

public MortgageCalculationsWeek5()

{

mainFrame = new JFrame();

mainFrame.setSize(900,600);

mainFrame.setLocation(100,0);

mainFrame.setTitle("MORTGAGE CALCULATOR");

mainFrame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

//create panels

mainPanel = new JPanel();

titlePanel = new JPanel();

buttonPanel = new JPanel();

piePanel = new JPanel();

basePanel = new JPanel(new GridLayout(0,1));

//Instruction labels for titlePanel

intructionLabel1 = new JLabel("Instructions:Enter in the principal amount that you want. Next either enter in the interest and term or select from the drop-down lists. After entering");

intructionLabel2 = new JLabel("the data, click on the CALCULATE button to calculate. If you want to enter in different information, click on the CLEAR button to clear the fields and start");

intructionLabel3 = new JLabel("over. When you are done, click on the EXIT button. ");

intructionLabel4 = new JLabel("");

intructionLabel5 = new JLabel("*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");

//principal label and text field

principalLabel = new JLabel("Principal:");

principalField = new JTextField(10);

interestLabel = new JLabel("Interest Rate (APR):");

String[] InterestRates = {"5.35", "5.50", "5.75"};

interestCombo = new JComboBox(InterestRates);

interestCombo.setEditable(false);

termLabel = new JLabel("Term (in years):");

//term combo box

//WORK ON THE CODE TO READ THE FILE HERE!!!*************************************************************

/*int termFile = 3;

int[] term = new int[termFile];

Scanner data = null;

try

{

data = new Scanner(new BufferedReader(new FileReader("LoanTerms.txt")));

int termNumber = 0;

while (data.hasNext())

{

if (data.hasNextInt())

{

term[termNumber++] = data.nextInt();

if (termNumber == termFile)

break;

}

else

{

data.next();

}

}

}

finally

{

}

int[] TermYears = {term[0], term[1], term[2]};

//PROBLEMS GETTING IT TO READ THE ARRAY CORRECTLY***************************************************

*/String[] TermYears = {"7", "15", "30"};//change this to the array for reading a file

termCombo = new JComboBox(TermYears);

termCombo.setSelectedIndex(0);

termCombo.setEditable(false);

//Monthly Payment label and text field

JLabel addSpace1 = new JLabel("");

JLabel addSpace2 = new JLabel("");

monthlyLabel = new JLabel("Monthly Payment:");

monthlyField = new JTextField(7);

intPaidLabel = new JLabel("Interest Paid:");

interestPaidField = new JTextField(7);

priPaidLabel = new JLabel("Principal Paid:");

principalPaidField = new JTextField(7);

//display area

displayArea = new JTextArea(5,70);

displayArea.setEditable(false);

displayPane = new JScrollPane(displayArea, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);

//buttons

calculateButton = new JButton("Calculate");

calculateButton.addActionListener(new CalculateButtonListener());

pieButton = new JButton("Create Pie Chart");

pieButton.addActionListener(new PieButtonListener());

clearButton = new JButton("Clear Selections");

clearButton.addActionListener(new ClearFieldsAction());

exitButton = new JButton("Exit Program");

exitButton.addActionListener(new ExitProgramAction());

pie1 = principalField.getText();

pie2 = monthlyField.getText();

inputs = new int[2];

pie = new Pie(new int[]{1,1});//{} is the array numbers 0 and 1 since we know it is going to start with 0; but if we start with 0, it will only show 1 color

piePanel.add(pie);

//add to titlePanel

titlePanel.add(intructionLabel1);

titlePanel.add(intructionLabel2);

titlePanel.add(intructionLabel3);

titlePanel.add(intructionLabel4);

titlePanel.add(intructionLabel5);

//add to mainPanel

mainPanel.add(addSpace1);

mainPanel.add(principalLabel);

mainPanel.add(principalField);

mainPanel.add(interestLabel);

mainPanel.add(interestCombo);

mainPanel.add(termLabel);

mainPanel.add(termCombo);

mainPanel.add(addSpace2);

mainPanel.add(monthlyLabel);

mainPanel.add(monthlyField);

mainPanel.add(intPaidLabel);

mainPanel.add(interestPaidField);

mainPanel.add(priPaidLabel);

mainPanel.add(principalPaidField);

mainPanel.add(displayPane);

buttonPanel.add(calculateButton);

buttonPanel.add(pieButton);

buttonPanel.add(clearButton);

buttonPanel.add(exitButton);

//add other panels to base

basePanel.add(titlePanel);

basePanel.add(mainPanel);

basePanel.add(buttonPanel);

basePanel.add(piePanel);

//add base panel to frame

mainFrame.setLayout(new GridLayout(0,1));

mainFrame.add(basePanel);

mainFrame.setVisible(true);

}

private void SetTextFunctionMonthly(String text)

{

monthlyField.setText(text);

}

private void SetTextFunctionPrincipal(String text)

{

principalPaidField.setText(text);

}

private void SetTextFunctionInterest(String text)

{

interestPaidField.setText(text);

}

class CalculateButtonListener implements ActionListener

{

public void actionPerformed (ActionEvent e) throws NullPointerException

{

principalString = principalField.getText();

interestString = (String)interestCombo.getSelectedItem();

termString = (String)termCombo.getSelectedItem();

//get user input and display exceptions

try

{

principalAmt = Double.parseDouble(principalString);

}

catch (Exception ex)

{

JOptionPane.showMessageDialog(null, "Error with the principal entered. Field is either blank or invalid data entered.", "Exception #1", JOptionPane.ERROR_MESSAGE);

principalField.requestFocus();

return;

}

try

{

loanInterest = Double.parseDouble(interestString);

}

catch (Exception ex)

{

JOptionPane.showMessageDialog(null, "Error with the interest entered. Field is either blank or invalid data entered.", "Exception #2", JOptionPane.ERROR_MESSAGE);

interestField.requestFocus();

return;

}

try

{

loanTerm = Double.parseDouble(termString);

}

catch (Exception ex)

{

JOptionPane.showMessageDialog(null, "Error with the term entered. Field is either blank or invalid data entered.", "Exception #3", JOptionPane.ERROR_MESSAGE);

termField.requestFocus();

return;

}

// Display principal, interest, and loan balance of entire term

months = loanTerm * 12;

monthlyInt = (loanInterest / 100) / 12;

monthlyPayment = (principalAmt * monthlyInt) / (1 - Math.pow(1 / (1 + monthlyInt), months));

DecimalFormat decimals2 = new DecimalFormat("0.00");

NumberFormat Currency = NumberFormat.getCurrencyInstance();

SetTextFunctionMonthly("" + decimals2.format(monthlyPayment));

for (int i = 1; i <= months; ++i)

{

interestPayment = principalAmt * monthlyInt;

principalPayment = monthlyPayment - interestPayment;

remainingBalance = principalAmt - principalPayment;

totalInterest = totalInterest += interestPayment;

totalPrincipal += principalPayment;

displayArea.append("\n#" + i + "\t\tP=" + Currency.format(principalPayment) + "\t\tI=" + Currency.format(interestPayment)

+ "\t\tB=" + Currency.format(remainingBalance) + "\n");

principalAmt -= principalPayment; // calculate until payments are done

}

totalInterestPaid = totalInterest += interestPayment;

totalPrincipalPaid = totalPrincipal += principalPayment;

SetTextFunctionInterest("" + decimals2.format(totalInterestPaid));

SetTextFunctionPrincipal("" + decimals2.format(totalPrincipalPaid));

//System.out.println("Total Interest: " + Currency.format(totalInterestPaid) + "\nTotal Principal: "+ Currency.format(totalPrincipalPaid));

}

}//END ACTIONLISTENER AND CALCULATION CLASS

class PieButtonListener extends JPanel implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

if (e.getSource() == pieButton)

{

//int[]a = new int[2];

inputs[0] = Integer.parseInt(interestPaidField.getText());

inputs[1] = Integer.parseInt(principalPaidField.getText());

pie.setNumber(inputs);

//pie = new Pie(inputs);

repaint();

}

}

}

class ClearFieldsAction implements ActionListener

//This clears the fields so the user can enter in new data.

{

public void actionPerformed(ActionEvent e)

{

principalField.setText("");

monthlyField.setText("");

displayArea.setText("");

principalField.requestFocus();

}

}//END ACTIONLISTENER TO CLEAR FIELDS

class ExitProgramAction implements ActionListener

//Displays a closing message then closes the program

{

public void actionPerformed(ActionEvent e)

{

if (e.getSource() == exitButton)

{

JOptionPane.showMessageDialog(MortgageCalculationsWeek5.this,"Have a great day!","Good-bye",JOptionPane.INFORMATION_MESSAGE);

System.exit(0);

}

}

}//END ACTIONLISTENER FOR EXIT BUTTON

}//end of program

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

class Pie extends JPanel

{

int[] number;

public Pie(int[] a)//constructor of pie chart

{

number = new int[a.length];

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

number[i]=a[i];//will throw a null point exception because this array was not created as an object without line 8

}

public void setNumber(int a[])

{

number = new int[a.length];

for (int i=0; i><a.length; i++)

number[i]=a[i];//will throw a null point exception because this array was not created as an object without line 8

System.out.println();

}

public void paintComponent(Graphics g)

{

int v = getWidth();

int h = getHeight();

int[] degrees = new int[number.length];

int a = 0;

/*for (int i=0; i><number.length; i++)

{

a += number[i];

}

for (int i=0; i><degrees.length; i++)

{

degrees[i]= number[i] / a;

}

g.setColor(Color.green);

g.fillArc(0, 0, v, h, 0, degrees[0]);

for (int i=1; i><degrees.length; i++)

{

g.setColor(Color.blue);

g.fillArc(0, 0, v, h, degrees[i-1], degrees[i]);

}

*/

degrees[0] = number[0] * 360 / (number[0]+number[1]);

degrees[1] = 360 - degrees[0];

g.setColor(Color.green);

g.fillArc(0, 0, v, h, 0, degrees[0]);

g.setColor(Color.blue);

g.fillArc(0, 0, v, h, degrees[0], degrees[1]);

}

}

>

DaBoujiboa at 2007-7-12 10:05:03 >