Java Pie Chart

				
'**************************************
' Name: Java Pie Chart
' Description:Just a cool pie chart... VOTE FOR ME ANYWAYS, please! :)
' By: Mike McNaughton
'
'This code is copyrighted and has' limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=2085&lngWId=14'for details.'**************************************

/* Pie chart Applet */
/* This program is in the public domain. 
*/
import java.awt.*;
import java.applet.*;
import java.util.*;
import java.lang.Math;
// ================================================================
// A struct class to hold data for one wedge
class PieItem {
 public double frac; // each one has a number
 public String label; // and a label
 PieItem (String s) { // constructor
StringTokenizer t = new StringTokenizer(s, ",");
frac = Double.valueOf(t.nextToken()).doubleValue();
label = t.nextToken();
 } // constructor
} // PieItem
//The view of the pie.
class PieView extends Canvas {
 PieItem[] wedges; // The data for the pie
 double total = 0.0; // Total of all wedges
 static final int ncolors = 5;
 Color wedgeColor[] = new Color[5];
 int pieViewSize; // size of square to incise pie into
 static final int pieBorderWidth = 10; // pixels from circle edge to side
 int pieDiameter; // derived from the view size
 int pieRadius; // ..
 int pieCenterPos; // ..
 
 public PieView(int asize, PieItem[] avec) { // constructor
this.pieViewSize = asize; // copy args
this.wedges = avec;
pieDiameter = pieViewSize-2*pieBorderWidth;
pieRadius = pieDiameter/2;
pieCenterPos = pieBorderWidth+pieRadius;
this.setFont(new Font("Helvetica",Font.BOLD,12));
this.setBackground(Color.white);
for (int i = 0; i<wedges.length; i++) {
 total += wedges[i].frac;
}
wedgeColor[0] = Color.green; // colors that black looks good on
wedgeColor[1] = Color.pink;
wedgeColor[2] = Color.cyan;
wedgeColor[3] = Color.red;
wedgeColor[4] = Color.yellow;
 } // constructor
 public void paint(Graphics g) {
int startDeg = 0;
int arcDeg;
int x, y;
double angleRad;
g.setColor(Color.lightGray); // shadow
g.fillOval(pieBorderWidth+3,pieBorderWidth+3,pieDiameter,pieDiameter);
g.setColor(Color.gray); // "other" is gray
g.fillOval(pieBorderWidth,pieBorderWidth,pieDiameter,pieDiameter);
int wci = 0;
int i;
for (i = 0; i<this.wedges.length; i++) { // draw wedges
 arcDeg = (int)((this.wedges[i].frac / total) * 360);
 g.setColor(wedgeColor[wci++]);
 g.fillArc(pieBorderWidth,pieBorderWidth,pieDiameter,pieDiameter,
		startDeg, arcDeg);
 if (wci >= ncolors) {
	wci = 0; // rotate colors
 }
 startDeg += arcDeg;
} // draw wedges
startDeg = 0; // Do labels so they go on top of the wedges.
for (i = 0; i<this.wedges.length; i++) {
 arcDeg = (int)((this.wedges[i].frac / total) * 360);
 if (arcDeg > 3) { // don't label small wedges
	g.setColor(Color.black);
	angleRad = (float) (startDeg+(arcDeg/2))* java.lang.Math.PI / 180.0;
	x = pieCenterPos + (int)((pieRadius/1.3)*java.lang.Math.cos(angleRad));
	y = pieCenterPos - (int)((pieRadius/1.3)*java.lang.Math.sin(angleRad))
+ 5; // 5 is about half the height of the text
	g.drawString(this.wedges[i].label, x, y);
 } // don't label small wedges
 startDeg += arcDeg;
} // for
 } // paint()
 public Dimension preferredSize () {
return new Dimension (pieViewSize,pieViewSize);
 } // preferredSize
 
} // PieView
// ================================================================
// The Pie chart applet
public class Pie extends Applet {
 private PieView the_pie = null;
 public Pie() { // constructor
// Nothing happens here, can't get args yet.
 } // constructor
 public void init () {
String stemp;
double dtemp;
int i;
// Read the applet arguments
stemp = this.getParameter("title");
String chartTitle = (stemp == null) ? "" : stemp;
stemp = this.getParameter("subtitle");
String chartSubTitle = (stemp == null) ? "" : stemp;
int nargs = 0;
while (this.getParameter("arg"+nargs) != null) {
 nargs++; // just count the arguments
} // while
PieItem[] v = new PieItem[nargs]; // allocate storage
for (i=0; i<nargs; i++) {
 v[i] = new PieItem(getParameter("arg"+i)); // parse argument
} // for
int d = (i+1)/2; // Shell sort
do {
 for (i=0; i < nargs-d; i++) {
	if (v[i].frac < v[i+d].frac) {
	 dtemp = v[i].frac; // swap
	 v[i].frac = v[i+d].frac;
	 v[i+d].frac = dtemp;
	 stemp = v[i].label;
	 v[i].label = v[i+d].label;
	 v[i+d].label = stemp;
	}
 } // for
 d -= 1;
} while (d > 0);
int h = this.size().height;
int w = this.size().width;
the_pie = new PieView(h-50, v); // shd be min(h-50,w)?
this.setLayout(new BorderLayout(0,0));
this.setBackground(Color.white);
this.add("Center", the_pie);
this.add("North", new Label(chartTitle));
this.add("South", new Label(chartSubTitle));
 } // init
 // Boiler plate for HotJava
 public String getAppletInfo () {
return "Pie 1997-06-14 THVV";
 } // getAppletInfo
 public String [][] getParameterInfo () {
String [][] info = {
};
return info;
 } // getParameterInfo
 // Main program for testing only.
 public static void main(String args[]) {
Frame f = new Frame("Pie");
Pie p = new Pie();
p.init();
p.start();
f.add("Center",p);
f.resize(512,512);
f.show();
 } // main
} // Pie