114 lines
3.3 KiB
C
114 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 1980 Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
/*static char sccsid[] = "from: @(#)compkl.c 5.4 (Berkeley) 6/1/90";*/
|
|
static char rcsid[] = "$Id: compkl.c,v 1.2 1993/08/01 18:50:47 mycroft Exp $";
|
|
#endif /* not lint */
|
|
|
|
# include "trek.h"
|
|
|
|
/*
|
|
** compute klingon distances
|
|
**
|
|
** The klingon list has the distances for all klingons recomputed
|
|
** and sorted. The parameter is a Boolean flag which is set if
|
|
** we have just entered a new quadrant.
|
|
**
|
|
** This routine is used every time the Enterprise or the Klingons
|
|
** move.
|
|
*/
|
|
|
|
compkldist(f)
|
|
int f; /* set if new quadrant */
|
|
{
|
|
register int i, dx, dy;
|
|
double d;
|
|
double temp;
|
|
|
|
if (Etc.nkling == 0)
|
|
return;
|
|
for (i = 0; i < Etc.nkling; i++)
|
|
{
|
|
/* compute distance to the Klingon */
|
|
dx = Ship.sectx - Etc.klingon[i].x;
|
|
dy = Ship.secty - Etc.klingon[i].y;
|
|
d = dx * dx + dy * dy;
|
|
d = sqrt(d);
|
|
|
|
/* compute average of new and old distances to Klingon */
|
|
if (!f)
|
|
{
|
|
temp = Etc.klingon[i].dist;
|
|
Etc.klingon[i].avgdist = 0.5 * (temp + d);
|
|
}
|
|
else
|
|
{
|
|
/* new quadrant: average is current */
|
|
Etc.klingon[i].avgdist = d;
|
|
}
|
|
Etc.klingon[i].dist = d;
|
|
}
|
|
|
|
/* leave them sorted */
|
|
sortkl();
|
|
}
|
|
|
|
|
|
/*
|
|
** sort klingons
|
|
**
|
|
** bubble sort on ascending distance
|
|
*/
|
|
|
|
sortkl()
|
|
{
|
|
struct kling t;
|
|
register int f, i, m;
|
|
|
|
m = Etc.nkling - 1;
|
|
f = 1;
|
|
while (f)
|
|
{
|
|
f = 0;
|
|
for (i = 0; i < m; i++)
|
|
if (Etc.klingon[i].dist > Etc.klingon[i+1].dist)
|
|
{
|
|
bmove(&Etc.klingon[i], &t, sizeof t);
|
|
bmove(&Etc.klingon[i+1], &Etc.klingon[i], sizeof t);
|
|
bmove(&t, &Etc.klingon[i+1], sizeof t);
|
|
f = 1;
|
|
}
|
|
}
|
|
}
|