Plot line, bar and pie chart

Question

Anyone can let me know where can i learn or tutorial on how to plot line, bar and pie chart by using java2D... (no third-party software)....
thanks in advance.

Answer 1

Here's a pie chart app I made for an earlier question:
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import javax.swing.*;
public class PieChart {
  public static void main(String[] args) {
    int[] data = {
      18, 95, 102, 87
    PieCharter pie = new PieCharter();
    pie.enterData(data);
    JFrame f = new JFrame("Pie Chart");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.getContentPane().add(pie);
    f.setSize(400,300);
    f.setLocation(300,300);
    f.setVisible(true);
class PieCharter extends JPanel {
  int[] data, percents;
  int dataTotal;
  final int
    PAD = 25,
    R_PAD = 5;
  public PieCharter() {
    setBackground(Color.white);
  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D)g;
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);
    Font font = new Font("lucida sans unicode", Font.PLAIN, 16);
    g2.setFont(font);
    FontRenderContext frc = g2.getFontRenderContext();
    int width = getWidth();
    int height = getHeight();
    int cx = width/2;
    int cy = height/2;
    int dia = (int)Math.min(width, height) - 2*PAD;
    g2.draw(new Ellipse2D.Double((width - dia)/2, (height - dia)/2, dia, dia));
    // draw zero datum
    double radians = 0;
    int x = cx + (int)((dia/2) * Math.cos(radians));
    int y = cy - (int)((dia/2) * Math.sin(radians));
    g2.draw(new Line2D.Double(cx, cy, x, y));
    String s;
    int dataWidth, dataHeight, deltaR, rXInc, rYInc;
    for(int i = 0; i < data.length; i++) {
      radians += 2*Math.PI * data/dataTotal;
x = cx + (int)((dia/2) * Math.cos(radians));
y = cy - (int)((dia/2) * Math.sin(radians));
g2.draw(new Line2D.Double(cx, cy, x, y));
s = String.valueOf(percents[i]) + "%";
dataWidth = (int)font.getStringBounds(s, frc).getWidth();
dataHeight = (int)font.getLineMetrics(s, frc).getAscent();
deltaR = (int)Math.sqrt(dataWidth*dataWidth + dataHeight*dataHeight)/2 + R_PAD;
rXInc = (int)(deltaR * Math.cos(radians));
rYInc = (int)(deltaR * Math.sin(radians));
x += rXInc;
y -= rYInc;
x -= dataWidth/2;
y += dataHeight/2;
g2.drawString(s, x, y);
s = String.valueOf(data[i]);
dataWidth = (int)font.getStringBounds(s, frc).getWidth();
dataHeight = (int)font.getLineMetrics(s, frc).getAscent();
x = cx + (int)((dia/4) * Math.cos(radians - 2*Math.PI * data[i]/(2*dataTotal)));
y = cy - (int)((dia/4) * Math.sin(radians - 2*Math.PI * data[i]/(2*dataTotal)));
x -= dataWidth/2;
y += dataHeight/2;
g2.drawString(s, x, y);
private void prepareData() {
for(int i = 0; i < data.length; i++)
dataTotal += data[i];
percents = new int[data.length];
int dataPlus = 0;
for(int i = 0; i < data.length; i++) {
dataPlus += data[i];
percents[i] = Math.round(100 * dataPlus/dataTotal);
public void enterData(int[] data) {
this.data = data;
prepareData();
repaint();