Question

I only need to update this JAVA program to be able to :

1 ) Exit cleanly after creating the chart

2 ) change the pie chart to a perfect circle rather than an oval

3 ) provide a separate class driver

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

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

// class to store the value and color mapping of the
// pie segment(slices)
class Segment {
double value;
Color color;

// constructor
public Segment(double value, Color color) {
this.value = value;
this.color = color;
}
}

class pieChartComponent extends JComponent {

private static final long serialVersionUID = 1L;
Segment[] Segments;

// Parameterized constructor
// create 4 segments of the pie chart
pieChartComponent(int v1, int v2, int v3, int v4) {
Segments = new Segment[] { new Segment(v1, Color.black), new Segment(v2, Color.green), new Segment(v3, Color.yellow),
new Segment(v4, Color.red) };
}

// function responsible for calling the worker method drawPie
public void paint(Graphics g) {
drawPie((Graphics2D) g, getBounds(), Segments);
}

// worker function for creating the percentage wise slices of the pie chart
  
void drawPie(Graphics2D g, Rectangle area, Segment[] Segments) {
double total = 0.0D;
// fin the total of the all the inputs provided by the user
for (int i = 0; i < Segments.length; i++) {
total += Segments[i].value;
}
  
// Initialization
double curValue = 0.0D;
int strtAngle = 0;
// iterate till all the segments are covered
for (int i = 0; i < Segments.length; i++) {
// compute start angle, with percentage
strtAngle = (int) (curValue * 360 / total);
// find the area angle of the segment
int arcAngle = (int) (Segments[i].value * 360 / total);

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

public class Graphic_Pie2D {
public static void main(String[] argv) {

System.out.println("Pleae provide 4 values, to create the pie chart");
Scanner input = new Scanner(System.in);
int v1, v2, v3, v4;
v1 = input.nextInt();
v2 = input.nextInt();
v3 = input.nextInt();
v4 = input.nextInt();
  
// create a JFrame with title
JFrame frame = new JFrame("Pie Chart");
frame.getContentPane().add(new pieChartComponent(v1,v2,v3,v4));
frame.setSize(500, 300);
frame.setVisible(true);

}
}

here's the assignment for reference :

Pie chart: prompt the user (at the command line) for 4 positive integers, then draw a pie chart in a window. Convert the numbers to percentages of the numbers’ total sum; color each segment differently; use Arc2D. No text fields (other than the window title) are required. Provide a driver in a separate source file to test your class.

Answer 1

/********** Need to change this file ***********/

/**************** Graphic_Pie2D.java **********************/

import java.util.Scanner;
import javax.swing.JFrame;

public class Graphic_Pie2D {
    public static void main(String[] argv) {

        System.out.println("Pleae provide 4 values, to create the pie chart");
        Scanner input = new Scanner(System.in);
        int v1, v2, v3, v4;
        v1 = input.nextInt();
        v2 = input.nextInt();
        v3 = input.nextInt();
        v4 = input.nextInt();

        // create a JFrame with title
        JFrame frame = new JFrame("Pie Chart");
        frame.getContentPane().add(new pieChartComponent(v1, v2, v3, v4));
        frame.setSize(500, 500);
        frame.setVisible(true);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

/************** setSize sets the dimensions, of frame, if you want a circle height and width (both parametrs) must be equals **************/

/*********** setDefaultCloseOperation sets whats happen when you click the top right red cross ************/

/*************** Output ***************/

/*********** If you have any doubt, you may ask in comments ***************/

/***************** Thanks for reading ******************/