gtkradiant/tools/quake3/q3map2/leakfile.c

/* -------------------------------------------------------------------------------

Copyright (C) 1999-2007 id Software, Inc. and contributors.
For a list of contributors, see the accompanying CONTRIBUTORS file.

This file is part of GtkRadiant.

GtkRadiant 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.

GtkRadiant 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 GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

----------------------------------------------------------------------------------

This code has been altered significantly from its original form, to support
several games based on the Quake III Arena engine, in the form of "Q3Map2."

------------------------------------------------------------------------------- */



/* marker */
#define LEAKFILE_C



/* dependencies */
#include "q3map2.h"



/*
==============================================================================

LEAK FILE GENERATION

Save out name.line for qe3 to read
==============================================================================
*/


/*
=============
LeakFile

Finds the shortest possible chain of portals
that leads from the outside leaf to a specifically
occupied leaf

TTimo: builds a polyline xml node
=============
*/
xmlNodePtr LeakFile (tree_t *tree)
{
	vec3_t	mid;
	FILE	*linefile;
	char	filename[1024];
	node_t	*node;
	int		count;
	xmlNodePtr xml_node, point;

	if (!tree->outside_node.occupied)
		return NULL;

	Sys_FPrintf (SYS_VRB,"--- LeakFile ---\n");

	//
	// write the points to the file
	//
	sprintf (filename, "%s.lin", source);
	linefile = fopen (filename, "w");
	if (!linefile)
		Error ("Couldn't open %s\n", filename);

  xml_node = xmlNewNode (NULL, "polyline");

	count = 0;
	node = &tree->outside_node;
	while (node->occupied > 1)
	{
		int			next;
		portal_t	*p, *nextportal;
		node_t		*nextnode;
		int			s;

		// find the best portal exit
		next = node->occupied;
		for (p=node->portals ; p ; p = p->next[!s])
		{
			s = (p->nodes[0] == node);
			if (p->nodes[s]->occupied
				&& p->nodes[s]->occupied < next)
			{
				nextportal = p;
				nextnode = p->nodes[s];
				next = nextnode->occupied;
			}
		}
		node = nextnode;
		WindingCenter (nextportal->winding, mid);
		fprintf (linefile, "%f %f %f\n", mid[0], mid[1], mid[2]);
		point = xml_NodeForVec(mid);
		xmlAddChild(xml_node, point);
		count++;
	}
	// add the occupant center
	GetVectorForKey (node->occupant, "origin", mid);

	fprintf (linefile, "%f %f %f\n", mid[0], mid[1], mid[2]);
	point = xml_NodeForVec(mid);
	xmlAddChild(xml_node, point);
	Sys_FPrintf( SYS_VRB, "%9d point linefile\n", count+1);

	fclose (linefile);
	
	return xml_node;
}