1 /* $NetBSD: move.c,v 1.5 1998/08/30 09:19:40 veego 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 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)move.c 8.1 (Berkeley) 5/31/93"; 40 #else 41 __RCSID("$NetBSD: move.c,v 1.5 1998/08/30 09:19:40 veego Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <stdio.h> 46 #include <math.h> 47 #include "trek.h" 48 49 /* 50 ** Move Under Warp or Impulse Power 51 ** 52 ** `Ramflag' is set if we are to be allowed to ram stars, 53 ** Klingons, etc. This is passed from warp(), which gets it from 54 ** either play() or ram(). Course is the course (0 -> 360) at 55 ** which we want to move. `Speed' is the speed we 56 ** want to go, and `time' is the expected time. It 57 ** can get cut short if a long range tractor beam is to occur. We 58 ** cut short the move so that the user doesn't get docked time and 59 ** energy for distance which he didn't travel. 60 ** 61 ** We check the course through the current quadrant to see that he 62 ** doesn't run into anything. After that, though, space sort of 63 ** bends around him. Note that this puts us in the awkward posi- 64 ** tion of being able to be dropped into a sector which is com- 65 ** pletely surrounded by stars. Oh Well. 66 ** 67 ** If the SINS (Space Inertial Navigation System) is out, we ran- 68 ** domize the course accordingly before ever starting to move. 69 ** We will still move in a straight line. 70 ** 71 ** Note that if your computer is out, you ram things anyway. In 72 ** other words, if your computer and sins are both out, you're in 73 ** potentially very bad shape. 74 ** 75 ** Klingons get a chance to zap you as you leave the quadrant. 76 ** By the way, they also try to follow you (heh heh). 77 ** 78 ** Return value is the actual amount of time used. 79 ** 80 ** 81 ** Uses trace flag 4. 82 */ 83 84 double move(ramflag, course, time, speed) 85 int ramflag; 86 int course; 87 double time; 88 double speed; 89 { 90 double angle; 91 double x, y, dx, dy; 92 int ix = 0, iy = 0; 93 double bigger; 94 int n; 95 int i; 96 double dist; 97 double sectsize; 98 double xn; 99 double evtime; 100 101 # ifdef xTRACE 102 if (Trace) 103 printf("move: ramflag %d course %d time %.2f speed %.2f\n", 104 ramflag, course, time, speed); 105 # endif 106 sectsize = NSECTS; 107 /* initialize delta factors for move */ 108 angle = course * 0.0174532925; 109 if (damaged(SINS)) 110 angle += Param.navigcrud[1] * (franf() - 0.5); 111 else 112 if (Ship.sinsbad) 113 angle += Param.navigcrud[0] * (franf() - 0.5); 114 dx = -cos(angle); 115 dy = sin(angle); 116 bigger = fabs(dx); 117 dist = fabs(dy); 118 if (dist > bigger) 119 bigger = dist; 120 dx /= bigger; 121 dy /= bigger; 122 123 /* check for long range tractor beams */ 124 /**** TEMPORARY CODE == DEBUGGING ****/ 125 evtime = Now.eventptr[E_LRTB]->date - Now.date; 126 # ifdef xTRACE 127 if (Trace) 128 printf("E.ep = %p, ->evcode = %d, ->date = %.2f, evtime = %.2f\n", 129 Now.eventptr[E_LRTB], Now.eventptr[E_LRTB]->evcode, 130 Now.eventptr[E_LRTB]->date, evtime); 131 # endif 132 if (time > evtime && Etc.nkling < 3) 133 { 134 /* then we got a LRTB */ 135 evtime += 0.005; 136 time = evtime; 137 } 138 else 139 evtime = -1.0e50; 140 dist = time * speed; 141 142 /* move within quadrant */ 143 Sect[Ship.sectx][Ship.secty] = EMPTY; 144 x = Ship.sectx + 0.5; 145 y = Ship.secty + 0.5; 146 xn = NSECTS * dist * bigger; 147 n = xn + 0.5; 148 # ifdef xTRACE 149 if (Trace) 150 printf("dx = %.2f, dy = %.2f, xn = %.2f, n = %d\n", dx, dy, xn, n); 151 # endif 152 Move.free = 0; 153 154 for (i = 0; i < n; i++) 155 { 156 ix = (x += dx); 157 iy = (y += dy); 158 # ifdef xTRACE 159 if (Trace) 160 printf("ix = %d, x = %.2f, iy = %d, y = %.2f\n", ix, x, iy, y); 161 # endif 162 if (x < 0.0 || y < 0.0 || x >= sectsize || y >= sectsize) 163 { 164 /* enter new quadrant */ 165 dx = Ship.quadx * NSECTS + Ship.sectx + dx * xn; 166 dy = Ship.quady * NSECTS + Ship.secty + dy * xn; 167 if (dx < 0.0) 168 ix = -1; 169 else 170 ix = dx + 0.5; 171 if (dy < 0.0) 172 iy = -1; 173 else 174 iy = dy + 0.5; 175 # ifdef xTRACE 176 if (Trace) 177 printf("New quad: ix = %d, iy = %d\n", ix, iy); 178 # endif 179 Ship.sectx = x; 180 Ship.secty = y; 181 compkldist(0); 182 Move.newquad = 2; 183 attack(0); 184 checkcond(); 185 Ship.quadx = ix / NSECTS; 186 Ship.quady = iy / NSECTS; 187 Ship.sectx = ix % NSECTS; 188 Ship.secty = iy % NSECTS; 189 if (ix < 0 || Ship.quadx >= NQUADS || iy < 0 || 190 Ship.quady >= NQUADS) { 191 if (!damaged(COMPUTER)) { 192 dumpme(0); 193 } else 194 lose(L_NEGENB); 195 } 196 initquad(0); 197 n = 0; 198 break; 199 } 200 if (Sect[ix][iy] != EMPTY) 201 { 202 /* we just hit something */ 203 if (!damaged(COMPUTER) && ramflag <= 0) 204 { 205 ix = x - dx; 206 iy = y - dy; 207 printf("Computer reports navigation error; %s stopped at %d,%d\n", 208 Ship.shipname, ix, iy); 209 Ship.energy -= Param.stopengy * speed; 210 break; 211 } 212 /* test for a black hole */ 213 if (Sect[ix][iy] == HOLE) 214 { 215 /* get dumped elsewhere in the galaxy */ 216 dumpme(1); 217 initquad(0); 218 n = 0; 219 break; 220 } 221 ram(ix, iy); 222 break; 223 } 224 } 225 if (n > 0) 226 { 227 dx = Ship.sectx - ix; 228 dy = Ship.secty - iy; 229 dist = sqrt(dx * dx + dy * dy) / NSECTS; 230 time = dist / speed; 231 if (evtime > time) 232 time = evtime; /* spring the LRTB trap */ 233 Ship.sectx = ix; 234 Ship.secty = iy; 235 } 236 Sect[Ship.sectx][Ship.secty] = Ship.ship; 237 compkldist(0); 238 return (time); 239 } 240