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Diffstat (limited to 'games/trek/compkl.c')
| -rw-r--r-- | games/trek/compkl.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/games/trek/compkl.c b/games/trek/compkl.c new file mode 100644 index 000000000000..42801de9cf89 --- /dev/null +++ b/games/trek/compkl.c @@ -0,0 +1,112 @@ +/* + * Copyright (c) 1980, 1993 + * The 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[] = "@(#)compkl.c 8.1 (Berkeley) 5/31/93"; +#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; + } + } +} |