1 /* $OpenBSD: klmove.c,v 1.4 2003/06/03 03:01:41 millert Exp $ */ 2 /* $NetBSD: klmove.c,v 1.3 1995/04/22 10:59:07 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1980, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)klmove.c 8.1 (Berkeley) 5/31/93"; 36 #else 37 static char rcsid[] = "$OpenBSD: klmove.c,v 1.4 2003/06/03 03:01:41 millert Exp $"; 38 #endif 39 #endif /* not lint */ 40 41 #include <stdio.h> 42 #include "trek.h" 43 44 /* 45 ** Move Klingons Around 46 ** 47 ** This is a largely incomprehensible block of code that moves 48 ** Klingons around in a quadrant. It was written in a very 49 ** "program as you go" fashion, and is a prime candidate for 50 ** rewriting. 51 ** 52 ** The flag `fl' is zero before an attack, one after an attack, 53 ** and two if you are leaving a quadrant. This serves to 54 ** change the probability and distance that it moves. 55 ** 56 ** Basically, what it will try to do is to move a certain number 57 ** of steps either toward you or away from you. It will avoid 58 ** stars whenever possible. Nextx and nexty are the next 59 ** sector to move to on a per-Klingon basis; they are roughly 60 ** equivalent to Ship.sectx and Ship.secty for the starship. Lookx and 61 ** looky are the sector that you are going to look at to see 62 ** if you can move their. Dx and dy are the increment. Fudgex 63 ** and fudgey are the things you change around to change your 64 ** course around stars. 65 */ 66 67 void 68 klmove(fl) 69 int fl; 70 { 71 int n; 72 struct kling *k; 73 double dx, dy; 74 int nextx, nexty; 75 int lookx, looky; 76 int motion; 77 int fudgex, fudgey; 78 int qx, qy; 79 double bigger; 80 int i; 81 82 # ifdef xTRACE 83 if (Trace) 84 printf("klmove: fl = %d, Etc.nkling = %d\n", fl, Etc.nkling); 85 # endif 86 for (n = 0; n < Etc.nkling; n++) 87 { 88 k = &Etc.klingon[n]; 89 i = 100; 90 if (fl) 91 i = 100.0 * k->power / Param.klingpwr; 92 if (ranf(i) >= Param.moveprob[2 * Move.newquad + fl]) 93 continue; 94 /* compute distance to move */ 95 motion = ranf(75) - 25; 96 motion *= k->avgdist * Param.movefac[2 * Move.newquad + fl]; 97 /* compute direction */ 98 dx = Ship.sectx - k->x + ranf(3) - 1; 99 dy = Ship.secty - k->y + ranf(3) - 1; 100 bigger = dx; 101 if (dy > bigger) 102 bigger = dy; 103 if (bigger == 0.0) 104 bigger = 1.0; 105 dx = dx / bigger + 0.5; 106 dy = dy / bigger + 0.5; 107 if (motion < 0) 108 { 109 motion = -motion; 110 dx = -dx; 111 dy = -dy; 112 } 113 fudgex = fudgey = 1; 114 /* try to move the klingon */ 115 nextx = k->x; 116 nexty = k->y; 117 for (; motion > 0; motion--) 118 { 119 lookx = nextx + dx; 120 looky = nexty + dy; 121 if (lookx < 0 || lookx >= NSECTS || looky < 0 || looky >= NSECTS) 122 { 123 /* new quadrant */ 124 qx = Ship.quadx; 125 qy = Ship.quady; 126 if (lookx < 0) 127 qx -= 1; 128 else 129 if (lookx >= NSECTS) 130 qx += 1; 131 if (looky < 0) 132 qy -= 1; 133 else 134 if (looky >= NSECTS) 135 qy += 1; 136 if (qx < 0 || qx >= NQUADS || qy < 0 || qy >= NQUADS || 137 Quad[qx][qy].stars < 0 || Quad[qx][qy].klings > MAXKLQUAD - 1) 138 break; 139 if (!damaged(SRSCAN)) 140 { 141 printf("Klingon at %d,%d escapes to quadrant %d,%d\n", 142 k->x, k->y, qx, qy); 143 motion = Quad[qx][qy].scanned; 144 if (motion >= 0 && motion < 1000) 145 Quad[qx][qy].scanned += 100; 146 motion = Quad[Ship.quadx][Ship.quady].scanned; 147 if (motion >= 0 && motion < 1000) 148 Quad[Ship.quadx][Ship.quady].scanned -= 100; 149 } 150 Sect[k->x][k->y] = EMPTY; 151 Quad[qx][qy].klings += 1; 152 Etc.nkling -= 1; 153 *k = Etc.klingon[Etc.nkling]; 154 Quad[Ship.quadx][Ship.quady].klings -= 1; 155 k = 0; 156 break; 157 } 158 if (Sect[lookx][looky] != EMPTY) 159 { 160 lookx = nextx + fudgex; 161 if (lookx < 0 || lookx >= NSECTS) 162 lookx = nextx + dx; 163 if (Sect[lookx][looky] != EMPTY) 164 { 165 fudgex = -fudgex; 166 looky = nexty + fudgey; 167 if (looky < 0 || looky >= NSECTS || Sect[lookx][looky] != EMPTY) 168 { 169 fudgey = -fudgey; 170 break; 171 } 172 } 173 } 174 nextx = lookx; 175 nexty = looky; 176 } 177 if (k && (k->x != nextx || k->y != nexty)) 178 { 179 if (!damaged(SRSCAN)) 180 printf("Klingon at %d,%d moves to %d,%d\n", 181 k->x, k->y, nextx, nexty); 182 Sect[k->x][k->y] = EMPTY; 183 Sect[k->x = nextx][k->y = nexty] = KLINGON; 184 } 185 } 186 compkldist(0); 187 } 188