/* gLife - An Artificial Life implementation using GNOME
 *
 * Copyright (C) 1999 Ali Abdin <aliabdin@aucegypt.edu>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 */

#include <gnome.h>
#include <glade/glade.h>

#include <libart_lgpl/art_svp_vpath_stroke.h>
#include <libart_lgpl/art_rgb_svp.h>
#include <libart_lgpl/art_rgb.h>
#include <libart_lgpl/art_vpath.h>
#include <libart_lgpl/art_svp_vpath.h>

#include "glife.h"
#include "drawing.h"
#include "data.h"
#include "simulation.h"

static ArtSVP*
get_line_svp (gint x1, gint y1, gint x2, gint y2) {
	
	ArtVpath vpath[3];
	ArtSVP *svp;
	gboolean line_width;
	
	line_width = 1.0;
	/* 1.0 pixel for the width of the line */
	
	vpath[0].code = ART_MOVETO_OPEN;
	vpath[0].x = x1;
	vpath[0].y = y1;
	vpath[1].code = ART_LINETO;
	vpath[1].x = x2;
	vpath[1].y = y2;
	vpath[2].code = ART_END;
	vpath[2].x = 0;
	vpath[2].y = 0;

	svp = art_svp_vpath_stroke (vpath,
				    ART_PATH_STROKE_JOIN_MITER,
				    ART_PATH_STROKE_CAP_BUTT,
				    line_width,
				    4.0,
				    1.0);
	return svp;
}

static ArtSVP*
get_circle_svp (gdouble x, gdouble y, gdouble radius) {
	ArtVpath *vpath;
	ArtSVP *svp;
	gdouble xcenter, ycenter;

	/* INTERVAL-1 because 1 is the width of the grid line */
	if (radius > 14.0)
		radius = 14.0;
	xcenter = (gdouble) ((14.0 - (2.0 * radius))/2.0) + radius + (x*INTERVAL);
	ycenter = (gdouble) ((14.0 - (2.0 * radius))/2.0) + radius + (y*INTERVAL);

	vpath = art_vpath_new_circle (xcenter, ycenter, radius);
	svp = art_svp_from_vpath (vpath);
	
	art_free (vpath);
	
	return svp;
}

static void
render_grid_to_buf() {
	gint i;
	
	/* FIXME: Would probably be more efficient to get the SVP's into an array
	 * and then render in one big go - Might not be possible - Need to ask Raph */
	for (i = 0; i <= height-1; i += INTERVAL) {
		ArtSVP *svp;

		svp = get_line_svp (i, 0, i, height-1);
		art_rgb_svp_alpha (svp, 0, 0, height, width, 0x000000ff,
			           drawbuf, ROWSTRIDE, NULL);
		art_svp_free (svp);
	}
	
	for (i = 0; i <= width-1; i += INTERVAL) {
		ArtSVP *svp;

		svp = get_line_svp (0, i, width-1, i);
		art_rgb_svp_alpha (svp, 0, 0, height, width, 0x000000ff,
			           drawbuf, ROWSTRIDE, NULL);	
		art_svp_free (svp);
	}	
}

static void
render_terrain_to_buf() {
	gint row,col;
	
	
	for (col = 0; col <= MAXCOL; col++)
		for (row = 0; row <= MAXROW; row++)
		{
			if (!(terrain[col][row].foodamt <= 0)) {
				ArtSVP *svp;

				svp = get_circle_svp((gdouble) col,
						     (gdouble) row,
						     RADSIZE(terrain[col][row].foodamt));
				art_rgb_svp_alpha (svp, 0, 0, height, width, terrcolor,
						   drawbuf, ROWSTRIDE, NULL);

				art_svp_free (svp);
				while (gtk_events_pending())
					gtk_main_iteration();
			}
		}	
}

static void
render_animals_to_buf() {
	GList *tmp;

	tmp = animal;
	while (tmp) {
		ArtSVP *svp;
		AnimalType *anim;
		
		anim = (AnimalType *) tmp->data;
		svp = get_circle_svp ((gdouble) anim->posx-1,
				      (gdouble) anim->posy-1,
				      3.0);
		if ((anim->sex == 'm') || (anim->sex == 'M'))
			art_rgb_svp_alpha (svp, 0, 0, height, width,
				 	   malecolor,
				   	   drawbuf, ROWSTRIDE, NULL);
		else
			art_rgb_svp_alpha (svp, 0, 0, height, width,
				 	   femalecolor,
				   	   drawbuf, ROWSTRIDE, NULL);		
		tmp = tmp->next;
                while (gtk_events_pending())
                	gtk_main_iteration();
		art_svp_free (svp);
	}
}

#if 0
void mini_render_terrain () {
	gint row,col;

	for (col = 0; col <= MAXCOL; col++)
		for (row = 0; row <= MAXROW; row++) {
			if (!(terrain[col][row].foodamt <= 0)) 
			   art_rgb_svp_alpha (terrain[col][row].svp, 0, 0, height, width, terrcolor,
			             	      drawbuf, ROWSTRIDE, NULL);
		}
}
#endif

void
render() {
	
	/* Fille with white before re-rendering to the buffer */
	art_rgb_fill_run ((art_u8 *)drawbuf, 255, 255, 255, width*height);
	
	if (ruleset.gridcheck) 
		render_grid_to_buf();
	if (ruleset.terraincheck)
		render_terrain_to_buf();
	if (ruleset.animalcheck)
		render_animals_to_buf();
}


gboolean 
on_darea_expose (GtkWidget *widget,
                 GdkEventExpose *event,
                 gpointer user_data)
{
  /* This function taken shamelessly from mattheiu */
  guchar *rgbbuf = (guchar *) user_data;

  
  /* render(); */
  
  gdk_draw_rgb_image (widget->window, widget->style->fg_gc[GTK_STATE_NORMAL],
                      0, 0, width, height,
                      GDK_RGB_DITHER_MAX, rgbbuf, ROWSTRIDE);
  return TRUE;
}