Sample project drawing sine graph in opengl java

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);

  }

 }

}