Java Programming:

Topic:

Graphics

Description

Write a program that inputs sales amounts from five regions of a company and displays a pie chart as a percentage of sales. See Implementation, Testing, Picture and Sample Code sections below.

Implementation

Write the following classes:

class JFrmeExt

Write a class JFrameExt that extends JFrame and provides the following:

Five private double variables for holding sales amounts from five regions: North, South, East, West, and Midwest.

A public constructor with five parameters that initializes the sales amounts for the five regions.

The method paint() that overrides the paint method in the parent class. In the paint method, convert the sales amounts into fraction of the total and display them as a pie chart as shown below. Also show a legend at the bottom of the pie chart.

class Main

Write a class Main that contains the method main(). In the main method, provide the following:

Prompt the user to input sales amounts for the five regions as double values.

Create a JFrameExt object and pass it the sales amounts of the five regions.

Set the size of the JFrameExt object to 500,650.

Set the JFrameExt object to be visible.

Testing

Use the following test data in millions of dollars:

North: 20.0

South: 25.0

East: 15.0

West: 30.0

Midwest 10.0

Picture

Sample Code

//Class JFrameExt

import java.awt.Color;

import java.awt.Graphics;

import java.awt.HeadlessException;

import javax.swing.JFrame;

public class JFrameExt extends JFrame {

private double north;

private double south;

private double east;

private double west;

private double midwest;

public JFrameExt(double north, double south, double east, double west,

double midwest) throws HeadlessException {

super();

this.north = north;

this.south = south;

this.east = east;

this.west = west;

this.midwest = midwest;

}

@Override

public void paint (Graphics g){

//clean the surface of all drawings

super.paint(g);

double total=north+south+east+west+midwest;

//draw arc for north region

int startAngle=0;

int arcLength=(int)(north/total*360.0);

g.setColor(Color.red);

g.fillArc(100,100,300,300,startAngle,arcLength);

//draw arc for south region

startAngle=startAngle+arcLength;

arcLength=(int)(south/total*360.0);

g.setColor(Color.green);

g.fillArc(100,100,300,300,startAngle,arcLength);

//draw arc for east region

//draw arc for west region

//draw arc for midwest region

//draw the legend for north region

int xRect=100;

int rectWidth=50;

int horSpacing=10;

int vertSpacing=5;

int yRect=500;

int rectHeight=10;

g.setColor(Color.red);

g.fillRect (xRect,yRect,rectWidth,rectHeight);

int xString=xRect+rectWidth+horSpacing;

int yString=yRect+rectHeight;

String theString="North - 20.0";

g.drawString (theString,xString,yString);

//draw the legend for south region

//x-values stay the same

//y-values change

yRect=yRect+rectHeight+vertSpacing;

rectHeight=10;

g.setColor(Color.green);

g.fillRect (xRect,yRect,rectWidth,rectHeight);

//xString=xRect+rectWidth+horSpacing;

yString=yRect+rectHeight;

theString="South - 25.0";

g.drawString (theString,xString,yString);

//draw the legend for east region

//draw the legend for west region

//draw the legend for east region

}

}

//Class Main

//Input the sales amount from the user.

//In the code below, sales amounts are hard-coded for convenience

public class Main {

public static void main(String[] args) {

JFrameExt f = new JFrameExt(20,25,15,30,10);

f.setSize(500,650);

f.setVisible(true);

}

}