1 /*- 2 * Copyright (c) 1980, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)klmove.c 8.1 (Berkeley) 5/31/93 30 * $FreeBSD: src/games/trek/klmove.c,v 1.4 1999/11/30 03:49:49 billf Exp $ 31 * $DragonFly: src/games/trek/klmove.c,v 1.4 2006/10/08 17:11:30 pavalos Exp $ 32 */ 33 34 #include "trek.h" 35 36 /* 37 ** Move Klingons Around 38 ** 39 ** This is a largely incomprehensible block of code that moves 40 ** Klingons around in a quadrant. It was written in a very 41 ** "program as you go" fashion, and is a prime candidate for 42 ** rewriting. 43 ** 44 ** The flag `fl' is zero before an attack, one after an attack, 45 ** and two if you are leaving a quadrant. This serves to 46 ** change the probability and distance that it moves. 47 ** 48 ** Basically, what it will try to do is to move a certain number 49 ** of steps either toward you or away from you. It will avoid 50 ** stars whenever possible. Nextx and nexty are the next 51 ** sector to move to on a per-Klingon basis; they are roughly 52 ** equivalent to Ship.sectx and Ship.secty for the starship. Lookx and 53 ** looky are the sector that you are going to look at to see 54 ** if you can move their. Dx and dy are the increment. Fudgex 55 ** and fudgey are the things you change around to change your 56 ** course around stars. 57 */ 58 59 void 60 klmove(int fl) 61 { 62 int n; 63 struct kling *k; 64 double dx, dy; 65 int nextx, nexty; 66 int lookx, looky; 67 int motion; 68 int fudgex, fudgey; 69 int qx, qy; 70 double bigger; 71 int i; 72 73 #ifdef xTRACE 74 if (Trace) 75 printf("klmove: fl = %d, Etc.nkling = %d\n", fl, Etc.nkling); 76 #endif 77 for (n = 0; n < Etc.nkling; n++) { 78 k = &Etc.klingon[n]; 79 i = 100; 80 if (fl) 81 i = 100.0 * k->power / Param.klingpwr; 82 if (ranf(i) >= Param.moveprob[2 * Move.newquad + fl]) 83 continue; 84 /* compute distance to move */ 85 motion = ranf(75) - 25; 86 motion *= k->avgdist * Param.movefac[2 * Move.newquad + fl]; 87 /* compute direction */ 88 dx = Ship.sectx - k->x + ranf(3) - 1; 89 dy = Ship.secty - k->y + ranf(3) - 1; 90 bigger = dx; 91 if (dy > bigger) 92 bigger = dy; 93 if (bigger == 0.0) 94 bigger = 1.0; 95 dx = dx / bigger + 0.5; 96 dy = dy / bigger + 0.5; 97 if (motion < 0) { 98 motion = -motion; 99 dx = -dx; 100 dy = -dy; 101 } 102 fudgex = fudgey = 1; 103 /* try to move the klingon */ 104 nextx = k->x; 105 nexty = k->y; 106 for (; motion > 0; motion--) { 107 lookx = nextx + dx; 108 looky = nexty + dy; 109 if (lookx < 0 || lookx >= NSECTS || 110 looky < 0 || looky >= NSECTS) { 111 /* new quadrant */ 112 qx = Ship.quadx; 113 qy = Ship.quady; 114 if (lookx < 0) 115 qx -= 1; 116 else 117 if (lookx >= NSECTS) 118 qx += 1; 119 if (looky < 0) 120 qy -= 1; 121 else 122 if (looky >= NSECTS) 123 qy += 1; 124 if (qx < 0 || qx >= NQUADS || 125 qy < 0 || qy >= NQUADS || 126 Quad[qx][qy].stars < 0 || 127 Quad[qx][qy].klings > MAXKLQUAD - 1) 128 break; 129 if (!damaged(SRSCAN)) { 130 printf("Klingon at %d,%d escapes to quadrant %d,%d\n", 131 k->x, k->y, qx, qy); 132 motion = Quad[qx][qy].scanned; 133 if (motion >= 0 && motion < 1000) 134 Quad[qx][qy].scanned += 100; 135 motion = Quad[Ship.quadx][Ship.quady].scanned; 136 if (motion >= 0 && motion < 1000) 137 Quad[Ship.quadx][Ship.quady].scanned -= 100; 138 } 139 Sect[k->x][k->y] = EMPTY; 140 Quad[qx][qy].klings += 1; 141 Etc.nkling -= 1; 142 bmove(&Etc.klingon[Etc.nkling], k, sizeof *k); 143 Quad[Ship.quadx][Ship.quady].klings -= 1; 144 k = 0; 145 break; 146 } 147 if (Sect[lookx][looky] != EMPTY) { 148 lookx = nextx + fudgex; 149 if (lookx < 0 || lookx >= NSECTS) 150 lookx = nextx + dx; 151 if (Sect[lookx][looky] != EMPTY) { 152 fudgex = -fudgex; 153 looky = nexty + fudgey; 154 if (looky < 0 || looky >= NSECTS || 155 Sect[lookx][looky] != EMPTY) { 156 fudgey = -fudgey; 157 break; 158 } 159 } 160 } 161 nextx = lookx; 162 nexty = looky; 163 } 164 if (k && (k->x != nextx || k->y != nexty)) { 165 if (!damaged(SRSCAN)) 166 printf("Klingon at %d,%d moves to %d,%d\n", 167 k->x, k->y, nextx, nexty); 168 Sect[k->x][k->y] = EMPTY; 169 Sect[k->x = nextx][k->y = nexty] = KLINGON; 170 } 171 } 172 compkldist(0); 173 } 174