1 /* $NetBSD: klmove.c,v 1.3 1995/04/22 10:59:07 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)klmove.c 8.1 (Berkeley) 5/31/93"; 39 #else 40 static char rcsid[] = "$NetBSD: klmove.c,v 1.3 1995/04/22 10:59:07 cgd Exp $"; 41 #endif 42 #endif /* not lint */ 43 44 # include "trek.h" 45 46 /* 47 ** Move Klingons Around 48 ** 49 ** This is a largely incomprehensible block of code that moves 50 ** Klingons around in a quadrant. It was written in a very 51 ** "program as you go" fashion, and is a prime candidate for 52 ** rewriting. 53 ** 54 ** The flag `fl' is zero before an attack, one after an attack, 55 ** and two if you are leaving a quadrant. This serves to 56 ** change the probability and distance that it moves. 57 ** 58 ** Basically, what it will try to do is to move a certain number 59 ** of steps either toward you or away from you. It will avoid 60 ** stars whenever possible. Nextx and nexty are the next 61 ** sector to move to on a per-Klingon basis; they are roughly 62 ** equivalent to Ship.sectx and Ship.secty for the starship. Lookx and 63 ** looky are the sector that you are going to look at to see 64 ** if you can move their. Dx and dy are the increment. Fudgex 65 ** and fudgey are the things you change around to change your 66 ** course around stars. 67 */ 68 69 klmove(fl) 70 int fl; 71 { 72 int n; 73 register struct kling *k; 74 double dx, dy; 75 int nextx, nexty; 76 register int lookx, looky; 77 int motion; 78 int fudgex, fudgey; 79 int qx, qy; 80 double bigger; 81 int i; 82 83 # ifdef xTRACE 84 if (Trace) 85 printf("klmove: fl = %d, Etc.nkling = %d\n", fl, Etc.nkling); 86 # endif 87 for (n = 0; n < Etc.nkling; k && n++) 88 { 89 k = &Etc.klingon[n]; 90 i = 100; 91 if (fl) 92 i = 100.0 * k->power / Param.klingpwr; 93 if (ranf(i) >= Param.moveprob[2 * Move.newquad + fl]) 94 continue; 95 /* compute distance to move */ 96 motion = ranf(75) - 25; 97 motion *= k->avgdist * Param.movefac[2 * Move.newquad + fl]; 98 /* compute direction */ 99 dx = Ship.sectx - k->x + ranf(3) - 1; 100 dy = Ship.secty - k->y + ranf(3) - 1; 101 bigger = dx; 102 if (dy > bigger) 103 bigger = dy; 104 if (bigger == 0.0) 105 bigger = 1.0; 106 dx = dx / bigger + 0.5; 107 dy = dy / bigger + 0.5; 108 if (motion < 0) 109 { 110 motion = -motion; 111 dx = -dx; 112 dy = -dy; 113 } 114 fudgex = fudgey = 1; 115 /* try to move the klingon */ 116 nextx = k->x; 117 nexty = k->y; 118 for (; motion > 0; motion--) 119 { 120 lookx = nextx + dx; 121 looky = nexty + dy; 122 if (lookx < 0 || lookx >= NSECTS || looky < 0 || looky >= NSECTS) 123 { 124 /* new quadrant */ 125 qx = Ship.quadx; 126 qy = Ship.quady; 127 if (lookx < 0) 128 qx -= 1; 129 else 130 if (lookx >= NSECTS) 131 qx += 1; 132 if (looky < 0) 133 qy -= 1; 134 else 135 if (looky >= NSECTS) 136 qy += 1; 137 if (qx < 0 || qx >= NQUADS || qy < 0 || qy >= NQUADS || 138 Quad[qx][qy].stars < 0 || Quad[qx][qy].klings > MAXKLQUAD - 1) 139 break; 140 if (!damaged(SRSCAN)) 141 { 142 printf("Klingon at %d,%d escapes to quadrant %d,%d\n", 143 k->x, k->y, qx, qy); 144 motion = Quad[qx][qy].scanned; 145 if (motion >= 0 && motion < 1000) 146 Quad[qx][qy].scanned += 100; 147 motion = Quad[Ship.quadx][Ship.quady].scanned; 148 if (motion >= 0 && motion < 1000) 149 Quad[Ship.quadx][Ship.quady].scanned -= 100; 150 } 151 Sect[k->x][k->y] = EMPTY; 152 Quad[qx][qy].klings += 1; 153 Etc.nkling -= 1; 154 bmove(&Etc.klingon[Etc.nkling], k, sizeof *k); 155 Quad[Ship.quadx][Ship.quady].klings -= 1; 156 k = 0; 157 break; 158 } 159 if (Sect[lookx][looky] != EMPTY) 160 { 161 lookx = nextx + fudgex; 162 if (lookx < 0 || lookx >= NSECTS) 163 lookx = nextx + dx; 164 if (Sect[lookx][looky] != EMPTY) 165 { 166 fudgex = -fudgex; 167 looky = nexty + fudgey; 168 if (looky < 0 || looky >= NSECTS || Sect[lookx][looky] != EMPTY) 169 { 170 fudgey = -fudgey; 171 break; 172 } 173 } 174 } 175 nextx = lookx; 176 nexty = looky; 177 } 178 if (k && (k->x != nextx || k->y != nexty)) 179 { 180 if (!damaged(SRSCAN)) 181 printf("Klingon at %d,%d moves to %d,%d\n", 182 k->x, k->y, nextx, nexty); 183 Sect[k->x][k->y] = EMPTY; 184 Sect[k->x = nextx][k->y = nexty] = KLINGON; 185 } 186 } 187 compkldist(0); 188 } 189