1 /* 2 * Copyright (c) 1980 Regents of the University of California. 3 * 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 34 #ifndef lint 35 /*static char sccsid[] = "from: @(#)move.c 5.4 (Berkeley) 6/1/90";*/ 36 static char rcsid[] = "$Id: move.c,v 1.2 1993/08/01 18:50:16 mycroft Exp $"; 37 #endif /* not lint */ 38 39 # include "trek.h" 40 41 /* 42 ** Move Under Warp or Impulse Power 43 ** 44 ** `Ramflag' is set if we are to be allowed to ram stars, 45 ** Klingons, etc. This is passed from warp(), which gets it from 46 ** either play() or ram(). Course is the course (0 -> 360) at 47 ** which we want to move. `Speed' is the speed we 48 ** want to go, and `time' is the expected time. It 49 ** can get cut short if a long range tractor beam is to occur. We 50 ** cut short the move so that the user doesn't get docked time and 51 ** energy for distance which he didn't travel. 52 ** 53 ** We check the course through the current quadrant to see that he 54 ** doesn't run into anything. After that, though, space sort of 55 ** bends around him. Note that this puts us in the awkward posi- 56 ** tion of being able to be dropped into a sector which is com- 57 ** pletely surrounded by stars. Oh Well. 58 ** 59 ** If the SINS (Space Inertial Navigation System) is out, we ran- 60 ** domize the course accordingly before ever starting to move. 61 ** We will still move in a straight line. 62 ** 63 ** Note that if your computer is out, you ram things anyway. In 64 ** other words, if your computer and sins are both out, you're in 65 ** potentially very bad shape. 66 ** 67 ** Klingons get a chance to zap you as you leave the quadrant. 68 ** By the way, they also try to follow you (heh heh). 69 ** 70 ** Return value is the actual amount of time used. 71 ** 72 ** 73 ** Uses trace flag 4. 74 */ 75 76 double move(ramflag, course, time, speed) 77 int ramflag; 78 int course; 79 double time; 80 double speed; 81 { 82 double angle; 83 double x, y, dx, dy; 84 register int ix, iy; 85 double bigger; 86 int n; 87 register int i; 88 double dist; 89 double sectsize; 90 double xn; 91 double evtime; 92 93 # ifdef xTRACE 94 if (Trace) 95 printf("move: ramflag %d course %d time %.2f speed %.2f\n", 96 ramflag, course, time, speed); 97 # endif 98 sectsize = NSECTS; 99 /* initialize delta factors for move */ 100 angle = course * 0.0174532925; 101 if (damaged(SINS)) 102 angle += Param.navigcrud[1] * (franf() - 0.5); 103 else 104 if (Ship.sinsbad) 105 angle += Param.navigcrud[0] * (franf() - 0.5); 106 dx = -cos(angle); 107 dy = sin(angle); 108 bigger = fabs(dx); 109 dist = fabs(dy); 110 if (dist > bigger) 111 bigger = dist; 112 dx /= bigger; 113 dy /= bigger; 114 115 /* check for long range tractor beams */ 116 /**** TEMPORARY CODE == DEBUGGING ****/ 117 evtime = Now.eventptr[E_LRTB]->date - Now.date; 118 # ifdef xTRACE 119 if (Trace) 120 printf("E.ep = %u, ->evcode = %d, ->date = %.2f, evtime = %.2f\n", 121 Now.eventptr[E_LRTB], 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 if (!damaged(COMPUTER)) 183 { 184 dumpme(0); 185 } 186 else 187 lose(L_NEGENB); 188 initquad(0); 189 n = 0; 190 break; 191 } 192 if (Sect[ix][iy] != EMPTY) 193 { 194 /* we just hit something */ 195 if (!damaged(COMPUTER) && ramflag <= 0) 196 { 197 ix = x - dx; 198 iy = y - dy; 199 printf("Computer reports navigation error; %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 { 207 /* get dumped elsewhere in the galaxy */ 208 dumpme(1); 209 initquad(0); 210 n = 0; 211 break; 212 } 213 ram(ix, iy); 214 break; 215 } 216 } 217 if (n > 0) 218 { 219 dx = Ship.sectx - ix; 220 dy = Ship.secty - iy; 221 dist = sqrt(dx * dx + dy * dy) / NSECTS; 222 time = dist / speed; 223 if (evtime > time) 224 time = evtime; /* spring the LRTB trap */ 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