I need help in drawing a 2D piechart in Java using the four data amounts that a

Question

I need help in drawing a 2D piechart in Java using the four data amounts that a user enters. To get each of the slices I need to use the "fillarc" method. I've already made a Barchart that works but I cannot figure out the Pie chart. I would prefer if your answer could be applied within my code when you submit it but it's not needed. Thanks! This is the code that I have so far:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;

public class BarChart extends JFrame implements ActionListener
{
JLabel title = new JLabel("Enter 4 dollar amounts for your investment portfolio: ");
JLabel first= new JLabel("First Value:");
JTextField firstIn = new JTextField("", 5);
JLabel second = new JLabel("Second Value:");
JTextField secondIn = new JTextField("", 5);
JLabel third = new JLabel("Third Value:");
JTextField thirdIn = new JTextField("", 5);
JLabel fourth = new JLabel("Fourth Value:");
JTextField fourthIn = new JTextField("", 5);
JButton button1 = new JButton("Pie Chart");
JButton button2 = new JButton("Bar Chart");
JButton button3 = new JButton("Clear");
DecimalFormat df = new DecimalFormat();

Container con = getContentPane();
FlowLayout flow = new FlowLayout();

JPanel topPanel = new JPanel(new GridLayout(3,0)); // to hold top 3 panels (see next 3 statements)
JPanel promptPanel = new JPanel(new FlowLayout()); // for topmost text
JPanel inputPanel = new JPanel (new FlowLayout()); // for labels and text fields
JPanel buttonPanel = new JPanel(new GridLayout(1,3)); // to hold the 3 buttons

JPanel centerPanel = new JPanel();

   IAPieChart[] pieValue = {new IAPieChart(5, Color.green),
new IAPieChart(4, Color.orange),
new IAPieChart(3, Color.blue),
new IAPieChart(2, Color.red)

// in your constructor below, add components to the correct panels, then add the
// topmost 3 panels to the topPanel, then add the topPanel to the NORTH.

boolean barOn = false;
boolean pieOn = false;

public BarChart()
{
   con.setLayout(new BorderLayout());
   first.setForeground(Color.red);
   second.setForeground(Color.orange);
   third.setForeground(Color.blue);
   fourth.setForeground(Color.green);

   topPanel.add(promptPanel);
   topPanel.add(inputPanel);
   promptPanel.add(title);
   topPanel.add(buttonPanel);
  
   inputPanel.add(first);
   inputPanel.add(firstIn);
   inputPanel.add(second);
   inputPanel.add(secondIn);
   inputPanel.add(third);
   inputPanel.add(thirdIn);
   inputPanel.add(fourth);
   inputPanel.add(fourthIn);
  
   buttonPanel.add(button1);
   buttonPanel.add(button2);
   buttonPanel.add(button3);
   button1.addActionListener(this);
   button2.addActionListener(this);
   button3.addActionListener(this);

  
  
   con.add(topPanel, BorderLayout.NORTH);
   con.add(centerPanel, BorderLayout.CENTER);

   firstIn.requestFocus();
}

public void actionPerformed(ActionEvent e)
{
   Object source = e.getSource();
   if (source == button2)
   {
   barOn=true;
    repaint();
   }

   topPanel.repaint();
  
}
      

public void paint(Graphics gr)
{
   super.paint(gr);
   df.setMaximumFractionDigits(1);
   df.setMinimumFractionDigits(1);
      
   gr.setColor(Color.white);
   gr.fillRect(0,0,getWidth(),getHeight());
   first.repaint();
   firstIn.repaint();
   second.repaint();
   secondIn.repaint();
   third.repaint();
   thirdIn.repaint();
   fourth.repaint();
   fourthIn.repaint();
   button1.repaint();
   button2.repaint();
   button3.repaint();
   title.repaint();
   if(barOn)
   {
   int barWidth=(int)((getWidth() - 20.0)/4-10);
   int maxBarHeight = getHeight() - 200;
   gr.setColor(Color.black);
   gr.drawLine(5, getHeight()-15,getWidth()-5,getHeight()-15);

   double in1 = Double.parseDouble(firstIn.getText());
   double in2 = Double.parseDouble(secondIn.getText());
   double in3 = Double.parseDouble(thirdIn.getText());
   double in4 = Double.parseDouble(fourthIn.getText());

   double max=in1;
   if (in2>max) {max=in2;}
   if (in3>max) {max=in3;}
   if (in4>max) {max=in4;}
   int x=15;

   double total=in1+in2+in3+in4;

   gr.setColor(Color.red);
   int newHeight=(int)(maxBarHeight*in1/max);
   int y = getHeight()-15-newHeight;S
   gr.fillRect(x,y,barWidth,newHeight);
   gr.drawString(df.format((in1/total*100))+"%", (x+(barWidth/2)-17), y - 7);

   gr.setColor(Color.orange);
   x += barWidth + 10;
   newHeight=(int)(maxBarHeight*in2/max);
   y = getHeight()-15-newHeight;
   gr.fillRect(x,y,barWidth,newHeight);
   gr.drawString(df.format((in2/total*100))+"%", (x+(barWidth/2)-17), y - 7);  

   gr.setColor(Color.blue);
   x += barWidth + 10;
   newHeight=(int)(maxBarHeight*in3/max);
   y = getHeight()-15-newHeight;
   gr.fillRect(x,y,barWidth,newHeight);
   gr.drawString(df.format((in3/total*100))+"%", (x+(barWidth/2)-17), y - 7);

   gr.setColor(Color.green);
   x += barWidth + 10;
   newHeight=(int)(maxBarHeight*in4/max);
   y = getHeight()-15-newHeight;
   gr.fillRect(x,y,barWidth,newHeight);
   gr.drawString(df.format((in4/total*100))+"%", (x+(barWidth/2)-17), y - 7);

   gr.setColor(Color.blue);
   gr.setFont(new Font("Arial", Font.ITALIC, 16));
   gr.drawString("Your investment portfolio",(getWidth()/2-35),getHeight()-centerPanel.getHeight()+15);   

   barOn=false;
  
}
  
}
public static void main(String[] args)
{
   BarChart f = new BarChart();

   f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   f.setSize(700,400);
   f.setVisible(true);
   f.setLocationRelativeTo(null);

  
}

}

Explanation / Answer

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;

import javax.swing.JComponent;
import javax.swing.JFrame;

class Slice {
double value;
Color color;

public Slice(double value, Color color) {
this.value = value;
this.color = color;
}
}

class MyComponent extends JComponent {
Slice[] slices = { new Slice(5, Color.black), new Slice(33, Color.green),
new Slice(20, Color.yellow), new Slice(15, Color.red) };

MyComponent() {

}
public void paint(Graphics g) {
drawPie((Graphics2D) g, getBounds(), slices);
}

void drawPie(Graphics2D g, Rectangle area, Slice[] slices) {
double total = 0.0D;
for (int i = 0; i < slices.length; i++) {
total += slices[i].value;
}

double curValue = 0.0D;
int startAngle = 0;
for (int i = 0; i < slices.length; i++) {
startAngle = (int) (curValue * 360 / total);
int arcAngle = (int) (slices[i].value * 360 / total);

g.setColor(slices[i].color);
g.fillArc(area.x, area.y, area.width, area.height, startAngle, arcAngle);
curValue += slices[i].value;
}
}
}

public class PieChart {
public static void main(String[] argv) {
JFrame frame = new JFrame();
frame.getContentPane().add(new MyComponent());
frame.setSize(700, 400);
frame.setVisible(true);

}
}

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