/*  Copyright (C) 1996-1997  Id Software, Inc.

    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

    See file, 'COPYING', for details.
*/

// This is a code harness for the tutor bot, which relies on some SP stuff.
// It has been designed to be the _absolute minimum_ that the bot needs to
// funciton, so there shouldn't be any duplication of code.

/*
=============
range

returns the range catagorization of an entity reletive to self
0	melee range, will become hostile even if back is turned
1	visibility and infront, or visibility and show hostile
2	infront and show hostile
3	only triggered by damage
=============
*/
float range (entity targ)
{
	vector	spot1, spot2;
	float	r;	
	spot1 = self.origin + self.view_ofs;
	spot2 = targ.origin + targ.view_ofs;
	
	r = vlen (spot1 - spot2);
	if (r < 120)
		return RANGE_MELEE;
	if (r < 500)
		return RANGE_NEAR;
	if (r < 1000)
		return RANGE_MID;
	return RANGE_FAR;
}

/*
=============
visible

returns 1 if the entity is visible to self, even if not infront ()
=============
*/
float visible (entity targ)
{
	vector	spot1, spot2;
	
	spot1 = self.origin + self.view_ofs;
	spot2 = targ.origin + targ.view_ofs;
	traceline (spot1, spot2, true, self);	// see through other monsters
	
	if (trace_inopen && trace_inwater)
		return false;			// sight line crossed contents

	if (trace_fraction == 1)
		return true;
	return false;
}

/*
=============
infront

returns 1 if the entity is in front (in sight) of self
=============
*/
float infront (entity targ)
{
	vector	vec;
	float	dot;
	
	makevectors (self.angles);
	vec = normalize (targ.origin - self.origin);
	dot = vec * v_forward;
	
	if ( dot > 0.3)
	{
		return true;
	}
	return false;
}