1 /* $NetBSD: move.c,v 1.11 2011/07/03 06:44:01 mrg 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)move.c 8.1 (Berkeley) 5/31/93"; 36 #else 37 __RCSID("$NetBSD: move.c,v 1.11 2011/07/03 06:44:01 mrg Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <stdio.h> 42 #include <math.h> 43 #include <float.h> 44 #include "trek.h" 45 46 /* 47 ** Move Under Warp or Impulse Power 48 ** 49 ** `Ramflag' is set if we are to be allowed to ram stars, 50 ** Klingons, etc. This is passed from warp(), which gets it from 51 ** either play() or ram(). Course is the course (0 -> 360) at 52 ** which we want to move. `Speed' is the speed we 53 ** want to go, and `time' is the expected time. It 54 ** can get cut short if a long range tractor beam is to occur. We 55 ** cut short the move so that the user doesn't get docked time and 56 ** energy for distance which he didn't travel. 57 ** 58 ** We check the course through the current quadrant to see that he 59 ** doesn't run into anything. After that, though, space sort of 60 ** bends around him. Note that this puts us in the awkward posi- 61 ** tion of being able to be dropped into a sector which is com- 62 ** pletely surrounded by stars. Oh Well. 63 ** 64 ** If the SINS (Space Inertial Navigation System) is out, we ran- 65 ** domize the course accordingly before ever starting to move. 66 ** We will still move in a straight line. 67 ** 68 ** Note that if your computer is out, you ram things anyway. In 69 ** other words, if your computer and sins are both out, you're in 70 ** potentially very bad shape. 71 ** 72 ** Klingons get a chance to zap you as you leave the quadrant. 73 ** By the way, they also try to follow you (heh heh). 74 ** 75 ** Return value is the actual amount of time used. 76 ** 77 ** 78 ** Uses trace flag 4. 79 */ 80 81 double 82 move(int ramflag, int course, double time, double speed) 83 { 84 double angle; 85 double x, y, dx, dy; 86 int ix = 0, iy = 0; 87 double bigger; 88 int n; 89 int i; 90 double dist; 91 double sectsize; 92 double xn; 93 double evtime; 94 95 #ifdef xTRACE 96 if (Trace) 97 printf("move: ramflag %d course %d time %.2f speed %.2f\n", 98 ramflag, course, time, speed); 99 #endif 100 sectsize = NSECTS; 101 /* initialize delta factors for move */ 102 angle = course * 0.0174532925; 103 if (damaged(SINS)) 104 angle += Param.navigcrud[1] * (franf() - 0.5); 105 else 106 if (Ship.sinsbad) 107 angle += Param.navigcrud[0] * (franf() - 0.5); 108 dx = -cos(angle); 109 dy = sin(angle); 110 bigger = fabs(dx); 111 dist = fabs(dy); 112 if (dist > bigger) 113 bigger = dist; 114 dx /= bigger; 115 dy /= bigger; 116 117 /* check for long range tractor beams */ 118 /**** TEMPORARY CODE == DEBUGGING ****/ 119 evtime = Now.eventptr[E_LRTB]->date - Now.date; 120 #ifdef xTRACE 121 if (Trace) 122 printf("E.ep = %p, ->evcode = %d, ->date = %.2f, " 123 "evtime = %.2f\n", 124 Now.eventptr[E_LRTB], Now.eventptr[E_LRTB]->evcode, 125 Now.eventptr[E_LRTB]->date, evtime); 126 #endif 127 if (time > evtime && Etc.nkling < 3) { 128 /* then we got a LRTB */ 129 evtime += 0.005; 130 time = evtime; 131 } else 132 evtime = DBL_MIN; 133 dist = time * speed; 134 135 /* move within quadrant */ 136 Sect[Ship.sectx][Ship.secty] = EMPTY; 137 x = Ship.sectx + 0.5; 138 y = Ship.secty + 0.5; 139 xn = NSECTS * dist * bigger; 140 n = xn + 0.5; 141 #ifdef xTRACE 142 if (Trace) 143 printf("dx = %.2f, dy = %.2f, xn = %.2f, n = %d\n", 144 dx, dy, xn, n); 145 #endif 146 Move.free = 0; 147 148 for (i = 0; i < n; i++) { 149 ix = (x += dx); 150 iy = (y += dy); 151 #ifdef xTRACE 152 if (Trace) 153 printf("ix = %d, x = %.2f, iy = %d, y = %.2f\n", 154 ix, x, iy, y); 155 #endif 156 if (x < 0.0 || y < 0.0 || x >= sectsize || y >= sectsize) { 157 /* enter new quadrant */ 158 dx = Ship.quadx * NSECTS + Ship.sectx + dx * xn; 159 dy = Ship.quady * NSECTS + Ship.secty + dy * xn; 160 if (dx < 0.0) 161 ix = -1; 162 else 163 ix = dx + 0.5; 164 if (dy < 0.0) 165 iy = -1; 166 else 167 iy = dy + 0.5; 168 #ifdef xTRACE 169 if (Trace) 170 printf("New quad: ix = %d, iy = %d\n", ix, iy); 171 #endif 172 Ship.sectx = x; 173 Ship.secty = y; 174 compkldist(0); 175 Move.newquad = 2; 176 attack(0); 177 checkcond(); 178 Ship.quadx = ix / NSECTS; 179 Ship.quady = iy / NSECTS; 180 Ship.sectx = ix % NSECTS; 181 Ship.secty = iy % NSECTS; 182 if (ix < 0 || Ship.quadx >= NQUADS || iy < 0 || 183 Ship.quady >= NQUADS) { 184 if (!damaged(COMPUTER)) { 185 dumpme(0); 186 } else 187 lose(L_NEGENB); 188 } 189 initquad(0); 190 n = 0; 191 break; 192 } 193 if (Sect[ix][iy] != EMPTY) { 194 /* we just hit something */ 195 if (!damaged(COMPUTER) && ramflag <= 0) { 196 ix = x - dx; 197 iy = y - dy; 198 printf("Computer reports navigation error; " 199 "%s stopped at %d,%d\n", 200 Ship.shipname, ix, iy); 201 Ship.energy -= Param.stopengy * speed; 202 break; 203 } 204 /* test for a black hole */ 205 if (Sect[ix][iy] == HOLE) { 206 /* get dumped elsewhere in the galaxy */ 207 dumpme(1); 208 initquad(0); 209 n = 0; 210 break; 211 } 212 ram(ix, iy); 213 break; 214 } 215 } 216 if (n > 0) { 217 dx = Ship.sectx - ix; 218 dy = Ship.secty - iy; 219 dist = sqrt(dx * dx + dy * dy) / NSECTS; 220 time = dist / speed; 221 if (evtime > time) { 222 /* spring the LRTB trap */ 223 time = evtime; 224 } 225 Ship.sectx = ix; 226 Ship.secty = iy; 227 } 228 Sect[Ship.sectx][Ship.secty] = Ship.ship; 229 compkldist(0); 230 return (time); 231 } 232
Indexes created Fri Sep 26 08:10:20 GMT 2025