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import java.awt.Color;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.RenderingHints;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class Grapher extends JPanel {

static double[] data;

int x, y, oldX, oldY;

final int PAD = 40;

protected void paintComponent(Graphics g) {

super.paintComponent(g);

Graphics2D g2 = (Graphics2D)g;

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

int w = getWidth();

int h = getHeight();

g2.drawLine(PAD, PAD, PAD, h-PAD);

g2.drawLine(PAD, h-PAD, w-PAD, h-PAD);

double xScale = (w - 2*PAD)/(data.length + 1.0d);

double maxValue = 100.0;

double yScale = (h - 2*PAD)/maxValue;

// The origin location.

int x0 = PAD;

int y0 = h-PAD;

oldX = PAD;

oldY = h-PAD;

g2.setPaint(Color.red);

for(int j = 0; j < data.length; j++) {

x = x0 + (int)(xScale * (j+1));

y = y0 - (int)(yScale * data[j]);

g2.drawLine(oldX, oldY, x, y);

oldX = x;

oldY = y;

}

}

public static float getPercentageDone(final float pSecondsElapsed, final float pDuration, final float pMinValue, final float pMaxValue) {

return (float) (pMaxValue * pSecondsElapsed / pDuration + pMinValue + 4.0f * Math.sin(Math.PI * pSecondsElapsed * 10.0f/pDuration));

}

public static void main(String[] args) {

data = new double[2000];

for (int i=0; i<2000; i++) {

data[i] = getPercentageDone(i, 2000.0f, 0.0f, 100.0f);

}

JFrame f = new JFrame();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.getContentPane().add(new Grapher());

f.setSize(400,400);

f.setLocation(200,200);

f.setVisible(true);

}

}