// ------------------------------------
//  plot.java
// -----------------------------------

// Computniks have the y axis pointing down!

import java.awt.Graphics;

public class plot extends java.applet.Applet
  {
    double f(double x)
     { return (Math.exp(Math.cos(x))); }


    public void paint(Graphics g)
     {


       String label = "Graph of f(x) = exp(cos(x)) on  [0, 10Pi] ^ [0, 3]";
       int nx = size().width;   // width
       int nyt = size().height; // total height
       int ny = (int)(nyt*0.75); // 25% for bottom label
       g.drawString(label,10, nyt-30); // margins 10 30


       // scale for the region
       double x0 = 0;
       double x1 = 31.42; // 10 Pi
       double y0 = 0;
       double y1 = 3;

       // put axes
       g.drawLine(0,ny-1,nx,ny-1);
       g.drawLine(0,ny,0,0);

       // plot graph
       double xa = 0.0;
       double xb = 0.0;
       double ya = 0.0;
       double yb = 0.0;
       int yai = 0;
       int ybi = 0;

       for (int i = 0 ; i < nx ; i++)
         {
           xa  = ((x1-x0)*i)/nx + x0;
           ya  = f(xa);
           yai = (ny - (int)((ya-y0)*ny/(y1-y0))); // (!)
           xb  = ((x1-x0)*(i+1))/nx + x0;
           yb = f(xb);
           ybi = (ny - (int)((yb-y0)*ny/(y1-y0))); // (!)
	       g.drawLine(i, yai, i + 1, ybi);
         }
  }
}