PieChart
// PieChart.java for Drawing Bar Chart.
// Author : Saket Kumar
// Email Id : saket_kumar@hotmail.com
import java.awt.*;
import java.io.*;
import java.lang.*;
public class PieChart extends java.applet.Applet {
String title;
Font font;
FontMetrics fontMetrics;
int titleHeight = 15;
int columns;
int values[];
Color colors[];
String labels[];
float percent[];
float angle[];
int maxLabelWidth = 0;
int maxValueWidth = 0;
int max = 0;
int strWidth=0;
boolean showLabel=true; // Whether to display label or not
boolean showPercent=true; // Whether to display percent or not
int lx=0,ly=0; //For Writing Label
int cx=0,cy=0; //Center of Circle
public synchronized void init() {
String temp;
font = new java.awt.Font("Sanserif", Font.BOLD, 12);
fontMetrics = getFontMetrics(font);
String bgColor=getParameter("bgcolor"); // Background color of Chart
if (bgColor==null)
setBackground(Color.white);
else{
if (bgColor.equals("red")) {
setBackground(Color.red);
} else if (bgColor.equals("green")) {
setBackground(Color.green);
} else if (bgColor.equals("blue")) {
setBackground(Color.blue);
} else if (bgColor.equals("pink")) {
setBackground(Color.pink);
} else if (bgColor.equals("orange")) {
setBackground(Color.orange);
} else if (bgColor.equals("magenta")) {
setBackground(Color.magenta);
} else if (bgColor.equals("cyan")) {
setBackground(Color.cyan);
} else if (bgColor.equals("white")) {
setBackground(Color.white);
} else if (bgColor.equals("yellow")) {
setBackground(Color.yellow);
} else if (bgColor.equals("gray")) {
setBackground(Color.gray);
} else if (bgColor.equals("darkGray")) {
setBackground(Color.darkGray);
} else {
setBackground(Color.white);
}
}
title = getParameter("title"); // Title of the Pie Chart
if (title == null) {
title = "Pie Chart";
}
temp = getParameter("columns");
if (temp == null) {
columns = 5;
} else {
columns = Integer.parseInt(temp);
}
temp = getParameter("showlabel");
if (temp == null) {
showLabel = true;
} else {
if (temp.equalsIgnoreCase("YES"))
showLabel = true;
if (temp.equalsIgnoreCase("NO"))
showLabel = false;
else
showLabel = true;
}
temp = getParameter("showpercent");
if (temp == null) {
showPercent = true;
} else {
if (temp.equalsIgnoreCase("YES"))
showPercent = true;
if (temp.equalsIgnoreCase("NO"))
showPercent = false;
else
showPercent = true;
}
values = new int[columns];
colors = new Color[columns];
labels = new String[columns];
percent= new float[columns];
angle = new float[columns];
float totalValue=0;
for (int i=0; i < columns; i++) {
temp = getParameter("Pvalue" + (i+1));
if (temp != null) {
try {
values[i] = Integer.parseInt(temp);
} catch (NumberFormatException e) {
values[i] = 0;
}
}
totalValue += values[i];
if (values[i] > max) {
max = values[i];
}
// parse the label for this column
temp = getParameter("P" + "label"+ (i+1) );
labels[i] = (temp == null) ? "" : temp;
maxLabelWidth = Math.max(fontMetrics.stringWidth((String)(labels[i])),
maxLabelWidth);
// parse the color attribute for this column
temp = getParameter("P" + "color"+ (i+1) );
if (temp != null) {
if (temp.equals("red")) {
colors[i] = Color.red;
} else if (temp.equals("green")) {
colors[i] = Color.green;
} else if (temp.equals("blue")) {
colors[i] = Color.blue;
} else if (temp.equals("pink")) {
colors[i] = Color.pink;
} else if (temp.equals("orange")) {
colors[i] = Color.orange;
} else if (temp.equals("magenta")) {
colors[i] = Color.magenta;
} else if (temp.equals("cyan")) {
colors[i] = Color.cyan;
} else if (temp.equals("white")) {
colors[i] = Color.white;
} else if (temp.equals("yellow")) {
colors[i] = Color.yellow;
} else if (temp.equals("gray")) {
colors[i] = Color.gray;
} else if (temp.equals("darkGray")) {
colors[i] = Color.darkGray;
} else {
colors[i] = Color.gray;
}
} else {
colors[i] = Color.gray;
}
}
float multiFactor = 100 / totalValue;
for (int i=0; i < columns; i++) {
percent[i]= values[i] * multiFactor;
angle[i] = (float) (percent[i] * 3.6) ; // Calculation of Angle (360/100)
}
}
// paint method
public synchronized void paint(Graphics g) {
int x=0;
int y=0;
int width=0,height=0;
int ax=0,ay=0; //For Drawing Black line from center to Peripherial
int px=0,py=0; //For Writing Percentage
int radius=0;
width=height=Math.min((getSize().width - 100),(getSize().height - 100));
x=y=50;
if ( getSize().width > width ){
x = (getSize().width - width ) /2 ;
}
cx = x + width/2;
cy = y + height/2;
radius = width/2;
// Draw the Title of the Chart on Top of the Applet
strWidth=fontMetrics.stringWidth(title);
Font fnt = new java.awt.Font("Sanserif", Font.BOLD, 16);
g.setFont(fnt);
g.setColor(Color.red);
g.drawString(title,((getSize().width - strWidth )/2),15);
g.setFont(font);
int initAngle=90;
int sweepAngle=0;
int incSweepAngle=0;
int incLabelAngle= (int) (angle[0]/2);
for (int i=0; i < columns; i++) {
sweepAngle = (int) Math.round(angle[i]);
g.setColor((Color)colors[i]);
if (i==(columns-1)){
sweepAngle = 360 - incSweepAngle;
g.fillArc(x,y,width,height,initAngle,(-sweepAngle));
g.setColor(Color.black);
g.drawArc(x,y,width,height,initAngle,(-sweepAngle));
if (showLabel){
lx = (int) (cx + ( radius * Math.cos((incLabelAngle * 3.14f/180) - 3.14f/2)));
ly = (int) (cy + ( radius * Math.sin((incLabelAngle * 3.14f/180) - 3.14f/2)));
adjustLabel(i);
g.drawString((String)labels[i],lx,ly);
}
if (showPercent){
px = (int) (cx + ((radius*2/3) * Math.cos((incLabelAngle * 3.14f/180) - 3.14f/2)));
py = (int) (cy + ((radius*2/3) * Math.sin((incLabelAngle * 3.14f/180) - 3.14f/2)));
g.drawString(String.valueOf(Math.round(percent[i]))+"%",px,py);
}
break;
}
g.fillArc(x,y,width,height,initAngle,(-sweepAngle));
g.setColor(Color.black);
g.drawArc(x,y,width,height,initAngle,(-sweepAngle));
incSweepAngle +=sweepAngle;
ax = (int) (cx + ( radius * Math.cos((incSweepAngle * 3.14f/180) - 3.14f/2)));
ay = (int) (cy + ( radius * Math.sin((incSweepAngle * 3.14f/180) - 3.14f/2)));
g.drawLine(cx,cy,ax,ay);
if (showLabel){
lx = (int) (cx + ( radius * Math.cos((incLabelAngle * 3.14f/180) - 3.14f/2)));
ly = (int) (cy + ( radius * Math.sin((incLabelAngle * 3.14f/180) - 3.14f/2)));
adjustLabel(i);
g.drawString((String)labels[i],lx,ly);
}
if (showPercent){
px = (int) (cx + ((radius*2/3) * Math.cos((incLabelAngle * 3.14f/180) - 3.14f/2)));
py = (int) (cy + ((radius*2/3) * Math.sin((incLabelAngle * 3.14f/180) - 3.14f/2)));
strWidth = fontMetrics.stringWidth(Math.round(percent[i])+"%");
g.drawString(String.valueOf(Math.round(percent[i]))+"%",(px - strWidth/2),py);
}
incLabelAngle = incLabelAngle + (int) (angle[i]/2 + angle[i+1]/2);
initAngle += (-sweepAngle);
}
g.setColor(Color.black);
g.drawLine(cx,cy,cx,cy-radius);
}
private void adjustLabel(int i){
if ( (lx > cx) && (ly < cy) ){
lx +=5;
ly -=5;
}
if ( (lx > cx) && (ly > cy) ){
lx +=5;
ly +=10;
}
if ( (lx < cx) && (ly > cy) ){
strWidth=fontMetrics.stringWidth(labels[i]);
lx -= strWidth+5;
if (lx < 0)
lx=0;
}
if ( (lx < cx) && (ly < cy) ){
strWidth=fontMetrics.stringWidth(labels[i]);
lx -= strWidth+5;
if (lx < 0)
lx=0;
}
}
}
Back to the PieChart applet page.
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