chase.c

quake1 dos源代码最新版本

/*
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.

*/
// chase.c -- chase camera code

#include "quakedef.h"

cvar_t	*chase_back;
cvar_t	*chase_up;
cvar_t	*chase_right;
cvar_t	*chase_active;

vec3_t	chase_pos;
vec3_t	chase_angles;

vec3_t	chase_dest;
vec3_t	chase_dest_angles;

// 2001-09-18 New cvar system by Maddes (Init)  start
void Chase_Init_Cvars (void)
{
	chase_back = Cvar_Get ("chase_back", "100", CVAR_ORIGINAL);
	chase_up = Cvar_Get ("chase_up", "16", CVAR_ORIGINAL);
	chase_right = Cvar_Get ("chase_right", "0", CVAR_ORIGINAL);
	chase_active = Cvar_Get ("chase_active", "0", CVAR_ORIGINAL);
}
// 2001-09-18 New cvar system by Maddes (Init)  end

void Chase_Init (void)
{
// 2001-09-18 New cvar system by Maddes (Init)  start
/*
	chase_back = Cvar_Get ("chase_back", "100", CVAR_ORIGINAL);
	chase_up = Cvar_Get ("chase_up", "16", CVAR_ORIGINAL);
	chase_right = Cvar_Get ("chase_right", "0", CVAR_ORIGINAL);
	chase_active = Cvar_Get ("chase_active", "0", CVAR_ORIGINAL);
*/
// 2001-09-18 New cvar system by Maddes (Init)  end
}

void Chase_Reset (void)
{
	// for respawning and teleporting
//	start position 12 units behind head
}

void TraceLine (vec3_t start, vec3_t end, vec3_t impact)
{
	trace_t	trace;

	memset (&trace, 0, sizeof(trace));
	SV_RecursiveHullCheck (cl.worldmodel->hulls, 0, 0, 1, start, end, &trace);

	VectorCopy (trace.endpos, impact);
}

void Chase_Update (void)
{
	int		i;
	float	dist;
	vec3_t	forward, up, right;
	vec3_t	dest, stop;


	// if can't see player, reset
	AngleVectors (cl.viewangles, forward, right, up);

	// calc exact destination
	for (i=0 ; i<3 ; i++)
		chase_dest[i] = r_refdef.vieworg[i]
		- forward[i]*chase_back->value
		- right[i]*chase_right->value;
	chase_dest[2] = r_refdef.vieworg[2] + chase_up->value;

	// find the spot the player is looking at
	VectorMA (r_refdef.vieworg, 4096, forward, dest);
	TraceLine (r_refdef.vieworg, dest, stop);

	// calculate pitch to look at the same spot from camera
	VectorSubtract (stop, r_refdef.vieworg, stop);
	dist = DotProduct (stop, forward);
	if (dist < 1)
		dist = 1;
	r_refdef.viewangles[PITCH] = -atan(stop[2] / dist) / M_PI * 180;

// 2000-01-09 ChaseCam fix by FrikaC  start
	TraceLine(r_refdef.vieworg, chase_dest, stop);
	if (Length(stop) != 0)
	{
		VectorCopy(stop, chase_dest);
	}
// 2000-01-09 ChaseCam fix by FrikaC  end

	// move towards destination
	VectorCopy (chase_dest, r_refdef.vieworg);
}