/* $Id: x08c.c 6375 2005-10-07 17:53:37Z airwin $

	3-d plot demo.

   Copyright (C) 2004  Alan W. Irwin
   Copyright (C) 2004  Rafael Laboissiere

   This file is part of PLplot.

   PLplot is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Library Public License as published
   by the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   PLplot is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with PLplot; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA


*/

#include "plcdemos.h"

#define XPTS   35		/* Data points in x */
#define YPTS   46		/* Data points in y */

static PLFLT alt[] = {60.0, 20.0};
static PLFLT az[] = {30.0, 60.0};
static void cmap1_init(int);

static char *title[] =
{
    "#frPLplot Example 8 - Alt=60, Az=30",
    "#frPLplot Example 8 - Alt=20, Az=60",
};

/*--------------------------------------------------------------------------*\
 * cmap1_init1
 *
 * Initializes color map 1 in HLS space.
 * Basic grayscale variation from half-dark (which makes more interesting
 * looking plot compared to dark) to light.
 * An interesting variation on this:
 *	s[1] = 1.0
\*--------------------------------------------------------------------------*/

static void
cmap1_init(int gray)
{
  PLFLT i[2], h[2], l[2], s[2];

  i[0] = 0.0;		/* left boundary */
  i[1] = 1.0;		/* right boundary */

  if (gray) {
    h[0] = 0.0;		/* hue -- low: red (arbitrary if s=0) */
    h[1] = 0.0;		/* hue -- high: red (arbitrary if s=0) */

    l[0] = 0.5;		/* lightness -- low: half-dark */
    l[1] = 1.0;		/* lightness -- high: light */

    s[0] = 0.0;		/* minimum saturation */
    s[1] = 0.0;		/* minimum saturation */
  } else {
    h[0] = 240; /* blue -> green -> yellow -> */
    h[1] = 0;   /* -> red */

    l[0] = 0.6;
    l[1] = 0.6;

    s[0] = 0.8;
    s[1] = 0.8;
  }

  plscmap1n(256);
  c_plscmap1l(0, 2, i, h, l, s, NULL);
}

/*--------------------------------------------------------------------------*\
 * main
 *
 * Does a series of 3-d plots for a given data set, with different
 * viewing options in each plot.
\*--------------------------------------------------------------------------*/


static int sombrero;

static PLOptionTable options[] = {
  {
    "sombrero",			/* Turns on use of Sombrero function */
    NULL,
    NULL,
    &sombrero,
    PL_OPT_BOOL,
    "-sombrero",
    "Use the \"sombrero\" function." },
  {
    NULL,			/* option */
    NULL,			/* handler */
    NULL,			/* client data */
    NULL,			/* address of variable to set */
    0,				/* mode flag */
    NULL,			/* short syntax */
    NULL }			/* long syntax */
};

#define LEVELS 10

int
main(int argc, char *argv[])
{
  int i, j, k;
  PLFLT *x, *y, **z;
  PLFLT xx, yy, r;
  PLINT ifshade;
  PLFLT zmin, zmax, step;
  PLFLT clevel[LEVELS];
  PLINT nlevel=LEVELS;
  int   rosen=1;

  /* Parse and process command line arguments */
  plMergeOpts(options, "x08c options",  NULL);
  (void) plparseopts(&argc, argv, PL_PARSE_FULL);
  if (sombrero)
    rosen=0;

  /* Initialize plplot */

  plinit();

/* Allocate data structures */

  x = (PLFLT *) calloc(XPTS, sizeof(PLFLT));
  y = (PLFLT *) calloc(YPTS, sizeof(PLFLT));

  plAlloc2dGrid(&z, XPTS, YPTS);

  for (i = 0; i < XPTS; i++) {
    x[i] = ((double) (i - (XPTS / 2)) / (double) (XPTS / 2));
    if (rosen)
      x[i] *=  1.5;
  }

  for (i = 0; i < YPTS; i++) {
    y[i] = (double) (i - (YPTS / 2)) / (double) (YPTS / 2);
    if (rosen)
      y[i] += 0.5;
  }

  for (i = 0; i < XPTS; i++) {
    xx = x[i];
    for (j = 0; j < YPTS; j++) {
      yy = y[j];
      if (rosen) {
	z[i][j] = pow(1. - xx, 2.) + 100. * pow(yy - pow(xx, 2.), 2.);
	/* The log argument may be zero for just the right grid.  */
	if (z[i][j] > 0.)
	  z[i][j] = log(z[i][j]);
	else
	  z[i][j] = -5.; /* -MAXFLOAT would mess-up up the scale */
      }
      else {
	r = sqrt(xx * xx + yy * yy);
	z[i][j] = exp(-r * r) * cos(2.0 * M_PI * r);
      }
    }
  }

  plMinMax2dGrid(z, XPTS, YPTS, &zmax, &zmin);
  step = (zmax-zmin)/(nlevel+1);
  for (i=0; i<nlevel; i++)
    clevel[i] = zmin + step + step*i;

  pllightsource(1.,1.,1.);

  for (k = 0; k < 2; k++) {
    for (ifshade = 0; ifshade < 4; ifshade++) {
      pladv(0);
      plvpor(0.0, 1.0, 0.0, 0.9);
      plwind(-1.0, 1.0, -0.9, 1.1);
      plcol0(3);
      plmtex("t", 1.0, 0.5, 0.5, title[k]);
      plcol0(1);
      if (rosen)
	plw3d(1.0, 1.0, 1.0, -1.5, 1.5, -0.5, 1.5, zmin, zmax, alt[k], az[k]);
      else
	plw3d(1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, zmin, zmax, alt[k], az[k]);

      plbox3("bnstu", "x axis", 0.0, 0,
	     "bnstu", "y axis", 0.0, 0,
	     "bcdmnstuv", "z axis", 0.0, 0);
      plcol0(2);

      if (ifshade == 0) { /* diffuse light surface plot */
	cmap1_init(1);
	plsurf3d(x, y, z, XPTS, YPTS, 0, NULL, 0);
      } else if (ifshade == 1) { /* magnitude colored plot */
	cmap1_init(0);
	plsurf3d(x, y, z, XPTS, YPTS, MAG_COLOR, NULL, 0);
      } else if (ifshade == 2) { /*  magnitude colored plot with faceted squares */
	cmap1_init(0);
	plsurf3d(x, y, z, XPTS, YPTS, MAG_COLOR | FACETED, NULL, 0);
      } else {                    /* magnitude colored plot with contours */
	cmap1_init(0);
	plsurf3d(x, y, z, XPTS, YPTS, MAG_COLOR | SURF_CONT | BASE_CONT, clevel, nlevel);
      }
    }
  }

/* Clean up */

  free((void *) x);
  free((void *) y);
  plFree2dGrid(z, XPTS, YPTS);

  plend();

  exit(0);
}
