/* $OpenBSD: move.c,v 1.8 2016/01/07 14:37:51 mestre Exp $ */ /* $NetBSD: move.c,v 1.3 1995/04/22 10:59:12 cgd Exp $ */ /* * Copyright (c) 1980, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <math.h> #include <stdio.h> #include "trek.h" /* ** Move Under Warp or Impulse Power ** ** `Ramflag' is set if we are to be allowed to ram stars, ** Klingons, etc. This is passed from warp(), which gets it from ** either play() or ram(). Course is the course (0 -> 360) at ** which we want to move. `Speed' is the speed we ** want to go, and `time' is the expected time. It ** can get cut short if a long range tractor beam is to occur. We ** cut short the move so that the user doesn't get docked time and ** energy for distance which he didn't travel. ** ** We check the course through the current quadrant to see that he ** doesn't run into anything. After that, though, space sort of ** bends around him. Note that this puts us in the awkward posi- ** tion of being able to be dropped into a sector which is com- ** pletely surrounded by stars. Oh Well. ** ** If the SINS (Space Inertial Navigation System) is out, we ran- ** domize the course accordingly before ever starting to move. ** We will still move in a straight line. ** ** Note that if your computer is out, you ram things anyway. In ** other words, if your computer and sins are both out, you're in ** potentially very bad shape. ** ** Klingons get a chance to zap you as you leave the quadrant. ** By the way, they also try to follow you (heh heh). ** ** Return value is the actual amount of time used. */ double move(int ramflag, int course, double time, double speed) { double angle; double x, y, dx, dy; int ix = 0, iy = 0; double bigger; int n, i; double dist, sectsize, xn, evtime; # ifdef xTRACE if (Trace) printf("move: ramflag %d course %d time %.2f speed %.2f\n", ramflag, course, time, speed); # endif sectsize = NSECTS; /* initialize delta factors for move */ angle = course * 0.0174532925; if (damaged(SINS)) angle += Param.navigcrud[1] * (franf() - 0.5); else if (Ship.sinsbad) angle += Param.navigcrud[0] * (franf() - 0.5); dx = -cos(angle); dy = sin(angle); bigger = fabs(dx); dist = fabs(dy); if (dist > bigger) bigger = dist; dx /= bigger; dy /= bigger; /* check for long range tractor beams */ /**** TEMPORARY CODE == DEBUGGING ****/ evtime = Now.eventptr[E_LRTB]->date - Now.date; # ifdef xTRACE if (Trace) printf("E.ep = %p, ->evcode = %d, ->date = %.2f, evtime = %.2f\n", Now.eventptr[E_LRTB], Now.eventptr[E_LRTB]->evcode, Now.eventptr[E_LRTB]->date, evtime); # endif if (time > evtime && Etc.nkling < 3) { /* then we got a LRTB */ evtime += 0.005; time = evtime; } else evtime = -1.0e50; dist = time * speed; /* move within quadrant */ Sect[Ship.sectx][Ship.secty] = EMPTY; x = Ship.sectx + 0.5; y = Ship.secty + 0.5; xn = NSECTS * dist * bigger; n = xn + 0.5; # ifdef xTRACE if (Trace) printf("dx = %.2f, dy = %.2f, xn = %.2f, n = %d\n", dx, dy, xn, n); # endif Move.free = 0; for (i = 0; i < n; i++) { ix = (x += dx); iy = (y += dy); # ifdef xTRACE if (Trace) printf("ix = %d, x = %.2f, iy = %d, y = %.2f\n", ix, x, iy, y); # endif if (x < 0.0 || y < 0.0 || x >= sectsize || y >= sectsize) { /* enter new quadrant */ dx = Ship.quadx * NSECTS + Ship.sectx + dx * xn; dy = Ship.quady * NSECTS + Ship.secty + dy * xn; if (dx < 0.0) ix = -1; else ix = dx + 0.5; if (dy < 0.0) iy = -1; else iy = dy + 0.5; # ifdef xTRACE if (Trace) printf("New quad: ix = %d, iy = %d\n", ix, iy); # endif Ship.sectx = x; Ship.secty = y; compkldist(0); Move.newquad = 2; attack(0); checkcond(); Ship.quadx = ix / NSECTS; Ship.quady = iy / NSECTS; Ship.sectx = ix % NSECTS; Ship.secty = iy % NSECTS; if (ix < 0 || Ship.quadx >= NQUADS || iy < 0 || Ship.quady >= NQUADS) { if (!damaged(COMPUTER)) dumpme(0); else lose(L_NEGENB); } initquad(0); n = 0; break; } if (Sect[ix][iy] != EMPTY) { /* we just hit something */ if (!damaged(COMPUTER) && ramflag <= 0) { ix = x - dx; iy = y - dy; printf("Computer reports navigation error; %s stopped at %d,%d\n", Ship.shipname, ix, iy); Ship.energy -= Param.stopengy * speed; break; } /* test for a black hole */ if (Sect[ix][iy] == HOLE) { /* get dumped elsewhere in the galaxy */ dumpme(1); initquad(0); n = 0; break; } ram(ix, iy); break; } } if (n > 0) { dx = Ship.sectx - ix; dy = Ship.secty - iy; dist = sqrt(dx * dx + dy * dy) / NSECTS; time = dist / speed; if (evtime > time) time = evtime; /* spring the LRTB trap */ Ship.sectx = ix; Ship.secty = iy; } Sect[Ship.sectx][Ship.secty] = Ship.ship; compkldist(0); return (time); }
