Sample project drawing sine graph in opengl java
import java.awt.BorderLayout;
import java.awt.Graphics;
import java.awt.Polygon;
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Exercise13_12 extends JFrame {
public Exercise13_12() {
         setLayout(new BorderLayout());
         add(new DrawSine(), BorderLayout.CENTER); }
public static void main(String[] args) {
         Exercise13_12 frame = new Exercise13_12();
         frame.setSize(400, 300);
         frame.setTitle("Exercise13_12");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setLocationRelativeTo(null);
         frame.setVisible(true);
}
class DrawSine extends JPanel {
       double f(double x) {
                  return Math.sin(x);
       }
       double gCos(double y) {
          return Math.cos(y);
       }
      protected void paintComponent(Graphics g)
{
      super.paintComponent(g);
     g.drawLine(10, 100, 380, 100);
     g.drawLine(200, 30, 200, 190);
     g.drawLine(380, 100, 370, 90);
     g.drawLine(380, 100, 370, 110);
     g.drawLine(200, 30, 190, 40);
     g.drawLine(200, 30, 210, 40);
     g.drawString("X", 360, 80);
     g.drawString("Y", 220, 40);
     Polygon p = new Polygon();
     Polygon p2 = new Polygon();
     for (int x = -170; x <= 170; x++) {
     p.addPoint(x + 200, 100 – (int) (50 * f((x / 100.0) * 2
                * Math.PI)));
     }
     for (int x = -170; x <= 170; x++) {
     p2.addPoint(x + 200, 100 – (int) (50 * gCos((x / 100.0) * 2
                 * Math.PI)));
     }
     g.setColor(Color.red);
     g.drawPolyline(p.xpoints, p.ypoints, p.npoints);
    g.drawString("-2u03c0", 95, 115);
    g.drawString("2u03c0", 305, 115);
    g.drawString("0", 200, 115);
    g.setColor(Color.blue);
   g.drawPolyline(p2.xpoints, p2.ypoints, p2.npoints);
 }
 }
}
