Thread: Pie Chart help

Hi forum,

I'm new to the forum and to java, what I thought would be simple(and it probably is) is giving me trouble. I have a project where I need to draw a pie chart based on input. I have 99% of the project done, I'm just not sure on how to draw the pie chart. Here is my code for the chart panel. I tried doing it as a bar graph, I just don't know how to do the pie. Please help point me in the right direction


import javax.swing.*;
import java.awt.*;

/**
* Created by S1195552 on 4/7/14.
*/
public class PanelChart extends JPanel {

private double Boston;
private double Miami;
private double Dallas;
private double StLouis;
private double KansasCity;
private double Seattle;
private double LosAngeles;
private double total;
private Graphics g;

public void paintComponent(Graphics g)
{
super.paintComponent(g);
this.g = g;
drawChart();

}

public void setPopulation(double boston, double miami, double dallas, double stLouis, double kansasCity, double seattle, double losAngeles) {
Boston = boston;
Miami = miami;
Dallas = dallas;
StLouis = stLouis;
KansasCity = kansasCity;
Seattle = seattle;
LosAngeles = losAngeles;

this.total = this.Boston +
this.Miami +
this.Dallas +
this.StLouis +
this.KansasCity +
this.Seattle +
this.LosAngeles;

repaint();
}

public void drawChart()
{
int pctBoston = (int)(Boston/total*100);
int pctMiami = (int)(Miami/total*100);
int pctDallas = (int)(Dallas/total*100);
int pctStLouis = (int)(StLouis/total*100);
int pctKansasCity = (int)(KansasCity/total*100);
int pctSeattle = (int)(Seattle/total*100);
int pctLosAngeles = (int)(LosAngeles/total*100);

int factor = 55;
g.setColor(Color.magenta);
//g.fillRect(25, factor * 1 - 15, pctBoston * 3, 10);
g.fillOval(25, factor * 1 - 15, pctBoston * 3, 10);
//g.drawOval();
g.setColor(Color.yellow);
g.fillRect(25,factor * 2-15,pctMiami*3,10);
g.setColor(Color.gray);
g.fillRect(25,factor * 3-15,pctDallas*3,10);
g.setColor(Color.green);
g.fillRect(25,factor * 4-15,pctStLouis*3,10);
g.setColor(Color.red);
g.fillRect(25,factor * 5-15,pctKansasCity*3,10);
g.setColor(Color.red);
g.fillRect(25,factor * 5-15,pctSeattle *3,10);

g.setColor(Color.red);
g.fillRect(25,factor * 5-15,pctLosAngeles*3,10);




}
}

Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

Please post your code correctly. What did you find when you searched the Internet for "java pie chart"?

I didnt find much that I recognize from class

--- Update ---

I'm currently trying to figure it out from the examples we did in class, but I'm having some trouble grasping some of it

--- Update ---

Here is the code properly formatted for the post

import javax.swing.*;
import java.awt.*;
 
/**
* Created by S1195552 on 4/7/14.
*/
public class PanelChart extends JPanel {
 
private double Boston;
private double Miami;
private double Dallas;
private double StLouis;
private double KansasCity;
private double Seattle;
private double LosAngeles;
private double total;
private Graphics g;
 
public void paintComponent(Graphics g)
{
super.paintComponent(g);
this.g = g;
drawChart();
 
}
 
public void setPopulation(double boston, double miami, double dallas, double stLouis, double kansasCity, double seattle, double losAngeles) {
Boston = boston;
Miami = miami;
Dallas = dallas;
StLouis = stLouis;
KansasCity = kansasCity;
Seattle = seattle;
LosAngeles = losAngeles;
 
this.total = this.Boston +
this.Miami +
this.Dallas +
this.StLouis +
this.KansasCity +
this.Seattle +
this.LosAngeles;
 
repaint();
}
 
public void drawChart()
{
int pctBoston = (int)(Boston/total*100);
int pctMiami = (int)(Miami/total*100);
int pctDallas = (int)(Dallas/total*100);
int pctStLouis = (int)(StLouis/total*100);
int pctKansasCity = (int)(KansasCity/total*100);
int pctSeattle = (int)(Seattle/total*100);
int pctLosAngeles = (int)(LosAngeles/total*100);
 
int factor = 55;
g.setColor(Color.magenta);
//g.fillRect(25, factor * 1 - 15, pctBoston * 3, 10);
g.fillOval(25, factor * 1 - 15, pctBoston * 3, 10);
//g.drawOval();
g.setColor(Color.yellow);
g.fillRect(25,factor * 2-15,pctMiami*3,10);
g.setColor(Color.gray);
g.fillRect(25,factor * 3-15,pctDallas*3,10);
g.setColor(Color.green);
g.fillRect(25,factor * 4-15,pctStLouis*3,10);
g.setColor(Color.red);
g.fillRect(25,factor * 5-15,pctKansasCity*3,10);
g.setColor(Color.red);
g.fillRect(25,factor * 5-15,pctSeattle *3,10);
 
g.setColor(Color.red);
g.fillRect(25,factor * 5-15,pctLosAngeles*3,10);
 
 
 
 
}
}