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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)move.c 8.1 (Berkeley) 5/31/93 34 * $FreeBSD: src/games/trek/move.c,v 1.6 1999/11/30 03:49:50 billf Exp $ 35 * $DragonFly: src/games/trek/move.c,v 1.2 2003/06/17 04:25:25 dillon Exp $ 36 */ 37 38 # include "trek.h" 39 40 /* 41 ** Move Under Warp or Impulse Power 42 ** 43 ** `Ramflag' is set if we are to be allowed to ram stars, 44 ** Klingons, etc. This is passed from warp(), which gets it from 45 ** either play() or ram(). Course is the course (0 -> 360) at 46 ** which we want to move. `Speed' is the speed we 47 ** want to go, and `time' is the expected time. It 48 ** can get cut short if a long range tractor beam is to occur. We 49 ** cut short the move so that the user doesn't get docked time and 50 ** energy for distance which he didn't travel. 51 ** 52 ** We check the course through the current quadrant to see that he 53 ** doesn't run into anything. After that, though, space sort of 54 ** bends around him. Note that this puts us in the awkward posi- 55 ** tion of being able to be dropped into a sector which is com- 56 ** pletely surrounded by stars. Oh Well. 57 ** 58 ** If the SINS (Space Inertial Navigation System) is out, we ran- 59 ** domize the course accordingly before ever starting to move. 60 ** We will still move in a straight line. 61 ** 62 ** Note that if your computer is out, you ram things anyway. In 63 ** other words, if your computer and sins are both out, you're in 64 ** potentially very bad shape. 65 ** 66 ** Klingons get a chance to zap you as you leave the quadrant. 67 ** By the way, they also try to follow you (heh heh). 68 ** 69 ** Return value is the actual amount of time used. 70 ** 71 ** 72 ** Uses trace flag 4. 73 */ 74 75 double move(ramflag, course, time, speed) 76 int ramflag; 77 int course; 78 double time; 79 double speed; 80 { 81 double angle; 82 double x, y, dx, dy; 83 int ix, iy; 84 double bigger; 85 int n; 86 int i; 87 double dist; 88 double sectsize; 89 double xn; 90 double evtime; 91 92 # ifdef xTRACE 93 if (Trace) 94 printf("move: ramflag %d course %d time %.2f speed %.2f\n", 95 ramflag, course, time, speed); 96 # endif 97 sectsize = NSECTS; 98 /* initialize delta factors for move */ 99 angle = course * 0.0174532925; 100 if (damaged(SINS)) 101 angle += Param.navigcrud[1] * (franf() - 0.5); 102 else 103 if (Ship.sinsbad) 104 angle += Param.navigcrud[0] * (franf() - 0.5); 105 dx = -cos(angle); 106 dy = sin(angle); 107 bigger = fabs(dx); 108 dist = fabs(dy); 109 if (dist > bigger) 110 bigger = dist; 111 dx /= bigger; 112 dy /= bigger; 113 114 /* check for long range tractor beams */ 115 /**** TEMPORARY CODE == DEBUGGING ****/ 116 evtime = Now.eventptr[E_LRTB]->date - Now.date; 117 # ifdef xTRACE 118 if (Trace) 119 printf("E.ep = %p, ->evcode = %d, ->date = %.2f, evtime = %.2f\n", 120 (void *)Now.eventptr[E_LRTB], 121 Now.eventptr[E_LRTB]->evcode, 122 Now.eventptr[E_LRTB]->date, evtime); 123 # endif 124 if (time > evtime && Etc.nkling < 3) 125 { 126 /* then we got a LRTB */ 127 evtime += 0.005; 128 time = evtime; 129 } 130 else 131 evtime = -1.0e50; 132 dist = time * speed; 133 134 /* move within quadrant */ 135 Sect[Ship.sectx][Ship.secty] = EMPTY; 136 x = Ship.sectx + 0.5; 137 y = Ship.secty + 0.5; 138 xn = NSECTS * dist * bigger; 139 n = xn + 0.5; 140 # ifdef xTRACE 141 if (Trace) 142 printf("dx = %.2f, dy = %.2f, xn = %.2f, n = %d\n", dx, dy, xn, n); 143 # endif 144 Move.free = 0; 145 146 for (i = 0; i < n; i++) 147 { 148 ix = (x += dx); 149 iy = (y += dy); 150 # ifdef xTRACE 151 if (Trace) 152 printf("ix = %d, x = %.2f, iy = %d, y = %.2f\n", ix, x, iy, y); 153 # endif 154 if (x < 0.0 || y < 0.0 || x >= sectsize || y >= sectsize) 155 { 156 /* enter new quadrant */ 157 dx = Ship.quadx * NSECTS + Ship.sectx + dx * xn; 158 dy = Ship.quady * NSECTS + Ship.secty + dy * xn; 159 if (dx < 0.0) 160 ix = -1; 161 else 162 ix = dx + 0.5; 163 if (dy < 0.0) 164 iy = -1; 165 else 166 iy = dy + 0.5; 167 # ifdef xTRACE 168 if (Trace) 169 printf("New quad: ix = %d, iy = %d\n", ix, iy); 170 # endif 171 Ship.sectx = x; 172 Ship.secty = y; 173 compkldist(0); 174 Move.newquad = 2; 175 attack(0); 176 checkcond(); 177 Ship.quadx = ix / NSECTS; 178 Ship.quady = iy / NSECTS; 179 Ship.sectx = ix % NSECTS; 180 Ship.secty = iy % NSECTS; 181 if (ix < 0 || Ship.quadx >= NQUADS || iy < 0 || Ship.quady >= NQUADS) 182 { 183 if (!damaged(COMPUTER)) 184 { 185 dumpme(0); 186 } 187 else 188 lose(L_NEGENB); 189 } 190 initquad(0); 191 n = 0; 192 break; 193 } 194 if (Sect[ix][iy] != EMPTY) 195 { 196 /* we just hit something */ 197 if (!damaged(COMPUTER) && ramflag <= 0) 198 { 199 ix = x - dx; 200 iy = y - dy; 201 printf("Computer reports navigation error; %s stopped at %d,%d\n", 202 Ship.shipname, ix, iy); 203 Ship.energy -= Param.stopengy * speed; 204 break; 205 } 206 /* test for a black hole */ 207 if (Sect[ix][iy] == HOLE) 208 { 209 /* get dumped elsewhere in the galaxy */ 210 dumpme(1); 211 initquad(0); 212 n = 0; 213 break; 214 } 215 ram(ix, iy); 216 break; 217 } 218 } 219 if (n > 0) 220 { 221 dx = Ship.sectx - ix; 222 dy = Ship.secty - iy; 223 dist = sqrt(dx * dx + dy * dy) / NSECTS; 224 time = dist / speed; 225 if (evtime > time) 226 time = evtime; /* spring the LRTB trap */ 227 Ship.sectx = ix; 228 Ship.secty = iy; 229 } 230 Sect[Ship.sectx][Ship.secty] = Ship.ship; 231 compkldist(0); 232 return (time); 233 } 234