public class surface {
  public static void main (String args []) {
     int n = 50, m = 50, i, j;
     float zmat []  = new float [n*m];

     double x, y;
     double fpi = 3.1415926/180.;
     double stepx = 360. / (n-1);
     double stepy = 360. / (m-1);
     for (i = 0; i < n; i++) {
       x = i * stepx;
       for (j = 0; j < m; j++) {
         y = j * stepy;
         zmat[i*m+j] = (float) (2 * Math.sin(x*fpi)* Math.sin(y*fpi));
       }
     }
       
     Dislin.metafl ("cons");
     Dislin.setpag ("da4p");
     Dislin.disini ();
     Dislin.pagera ();
     Dislin.hwfont ();

     Dislin.axspos (200, 2600);
     Dislin.axslen (1800, 1800);
         
     Dislin.name   ("X-axis", "x");
     Dislin.name   ("Y-axis",  "y");
     Dislin.name   ("Z-axis",  "z");

     Dislin.titlin ("Surface Plot (SURMAT)", 1);
     Dislin.titlin ("F(X,Y) = 2*SIN(X)*SIN(Y)", 3);

     Dislin.view3d (-5.f, -5.f, 4.f, "abs");
     Dislin.graf3d (0.f, 360.f, 0.f, 90.f,
                    0.f, 360.f, 0.f, 90.f,
                    -3.f, 3.f, -3.f, 1.f);
     Dislin.height (50);
     Dislin.title  ();
 
     Dislin.color  ("green");
     Dislin.surmat (zmat, n, m, 1, 1);
     Dislin.disfin ();
  }
}