move.c revision 1.3
1 /* $NetBSD: move.c,v 1.3 1995/04/22 10:59:12 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[] = "@(#)move.c 8.1 (Berkeley) 5/31/93"; 39 #else 40 static char rcsid[] = "$NetBSD: move.c,v 1.3 1995/04/22 10:59:12 cgd Exp $"; 41 #endif 42 #endif /* not lint */ 43 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 move(ramflag, course, time, speed) 82 int ramflag; 83 int course; 84 double time; 85 double speed; 86 { 87 double angle; 88 double x, y, dx, dy; 89 register int ix, iy; 90 double bigger; 91 int n; 92 register int i; 93 double dist; 94 double sectsize; 95 double xn; 96 double evtime; 97 98 # ifdef xTRACE 99 if (Trace) 100 printf("move: ramflag %d course %d time %.2f speed %.2f\n", 101 ramflag, course, time, speed); 102 # endif 103 sectsize = NSECTS; 104 /* initialize delta factors for move */ 105 angle = course * 0.0174532925; 106 if (damaged(SINS)) 107 angle += Param.navigcrud[1] * (franf() - 0.5); 108 else 109 if (Ship.sinsbad) 110 angle += Param.navigcrud[0] * (franf() - 0.5); 111 dx = -cos(angle); 112 dy = sin(angle); 113 bigger = fabs(dx); 114 dist = fabs(dy); 115 if (dist > bigger) 116 bigger = dist; 117 dx /= bigger; 118 dy /= bigger; 119 120 /* check for long range tractor beams */ 121 /**** TEMPORARY CODE == DEBUGGING ****/ 122 evtime = Now.eventptr[E_LRTB]->date - Now.date; 123 # ifdef xTRACE 124 if (Trace) 125 printf("E.ep = %u, ->evcode = %d, ->date = %.2f, evtime = %.2f\n", 126 Now.eventptr[E_LRTB], Now.eventptr[E_LRTB]->evcode, 127 Now.eventptr[E_LRTB]->date, evtime); 128 # endif 129 if (time > evtime && Etc.nkling < 3) 130 { 131 /* then we got a LRTB */ 132 evtime += 0.005; 133 time = evtime; 134 } 135 else 136 evtime = -1.0e50; 137 dist = time * speed; 138 139 /* move within quadrant */ 140 Sect[Ship.sectx][Ship.secty] = EMPTY; 141 x = Ship.sectx + 0.5; 142 y = Ship.secty + 0.5; 143 xn = NSECTS * dist * bigger; 144 n = xn + 0.5; 145 # ifdef xTRACE 146 if (Trace) 147 printf("dx = %.2f, dy = %.2f, xn = %.2f, n = %d\n", dx, dy, xn, n); 148 # endif 149 Move.free = 0; 150 151 for (i = 0; i < n; i++) 152 { 153 ix = (x += dx); 154 iy = (y += dy); 155 # ifdef xTRACE 156 if (Trace) 157 printf("ix = %d, x = %.2f, iy = %d, y = %.2f\n", ix, x, iy, y); 158 # endif 159 if (x < 0.0 || y < 0.0 || x >= sectsize || y >= sectsize) 160 { 161 /* enter new quadrant */ 162 dx = Ship.quadx * NSECTS + Ship.sectx + dx * xn; 163 dy = Ship.quady * NSECTS + Ship.secty + dy * xn; 164 if (dx < 0.0) 165 ix = -1; 166 else 167 ix = dx + 0.5; 168 if (dy < 0.0) 169 iy = -1; 170 else 171 iy = dy + 0.5; 172 # ifdef xTRACE 173 if (Trace) 174 printf("New quad: ix = %d, iy = %d\n", ix, iy); 175 # endif 176 Ship.sectx = x; 177 Ship.secty = y; 178 compkldist(0); 179 Move.newquad = 2; 180 attack(0); 181 checkcond(); 182 Ship.quadx = ix / NSECTS; 183 Ship.quady = iy / NSECTS; 184 Ship.sectx = ix % NSECTS; 185 Ship.secty = iy % NSECTS; 186 if (ix < 0 || Ship.quadx >= NQUADS || iy < 0 || Ship.quady >= NQUADS) 187 if (!damaged(COMPUTER)) 188 { 189 dumpme(0); 190 } 191 else 192 lose(L_NEGENB); 193 initquad(0); 194 n = 0; 195 break; 196 } 197 if (Sect[ix][iy] != EMPTY) 198 { 199 /* we just hit something */ 200 if (!damaged(COMPUTER) && ramflag <= 0) 201 { 202 ix = x - dx; 203 iy = y - dy; 204 printf("Computer reports navigation error; %s stopped at %d,%d\n", 205 Ship.shipname, ix, iy); 206 Ship.energy -= Param.stopengy * speed; 207 break; 208 } 209 /* test for a black hole */ 210 if (Sect[ix][iy] == HOLE) 211 { 212 /* get dumped elsewhere in the galaxy */ 213 dumpme(1); 214 initquad(0); 215 n = 0; 216 break; 217 } 218 ram(ix, iy); 219 break; 220 } 221 } 222 if (n > 0) 223 { 224 dx = Ship.sectx - ix; 225 dy = Ship.secty - iy; 226 dist = sqrt(dx * dx + dy * dy) / NSECTS; 227 time = dist / speed; 228 if (evtime > time) 229 time = evtime; /* spring the LRTB trap */ 230 Ship.sectx = ix; 231 Ship.secty = iy; 232 } 233 Sect[Ship.sectx][Ship.secty] = Ship.ship; 234 compkldist(0); 235 return (time); 236 } 237
Indexes created Tue Sep 30 20:09:53 GMT 2025