236 lines
6.5 KiB
C
236 lines
6.5 KiB
C
/* $NetBSD: move.c,v 1.6 2003/08/07 09:37:52 agc Exp $ */
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/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)move.c 8.1 (Berkeley) 5/31/93";
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#else
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__RCSID("$NetBSD: move.c,v 1.6 2003/08/07 09:37:52 agc Exp $");
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#endif
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#endif /* not lint */
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#include <stdio.h>
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#include <math.h>
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#include "trek.h"
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/*
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** Move Under Warp or Impulse Power
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**
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** `Ramflag' is set if we are to be allowed to ram stars,
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** Klingons, etc. This is passed from warp(), which gets it from
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** either play() or ram(). Course is the course (0 -> 360) at
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** which we want to move. `Speed' is the speed we
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** want to go, and `time' is the expected time. It
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** can get cut short if a long range tractor beam is to occur. We
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** cut short the move so that the user doesn't get docked time and
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** energy for distance which he didn't travel.
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**
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** We check the course through the current quadrant to see that he
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** doesn't run into anything. After that, though, space sort of
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** bends around him. Note that this puts us in the awkward posi-
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** tion of being able to be dropped into a sector which is com-
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** pletely surrounded by stars. Oh Well.
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**
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** If the SINS (Space Inertial Navigation System) is out, we ran-
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** domize the course accordingly before ever starting to move.
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** We will still move in a straight line.
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**
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** Note that if your computer is out, you ram things anyway. In
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** other words, if your computer and sins are both out, you're in
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** potentially very bad shape.
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**
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** Klingons get a chance to zap you as you leave the quadrant.
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** By the way, they also try to follow you (heh heh).
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**
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** Return value is the actual amount of time used.
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**
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**
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** Uses trace flag 4.
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*/
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double move(ramflag, course, time, speed)
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int ramflag;
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int course;
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double time;
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double speed;
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{
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double angle;
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double x, y, dx, dy;
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int ix = 0, iy = 0;
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double bigger;
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int n;
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int i;
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double dist;
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double sectsize;
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double xn;
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double evtime;
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# ifdef xTRACE
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if (Trace)
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printf("move: ramflag %d course %d time %.2f speed %.2f\n",
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ramflag, course, time, speed);
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# endif
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sectsize = NSECTS;
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/* initialize delta factors for move */
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angle = course * 0.0174532925;
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if (damaged(SINS))
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angle += Param.navigcrud[1] * (franf() - 0.5);
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else
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if (Ship.sinsbad)
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angle += Param.navigcrud[0] * (franf() - 0.5);
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dx = -cos(angle);
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dy = sin(angle);
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bigger = fabs(dx);
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dist = fabs(dy);
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if (dist > bigger)
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bigger = dist;
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dx /= bigger;
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dy /= bigger;
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/* check for long range tractor beams */
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/**** TEMPORARY CODE == DEBUGGING ****/
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evtime = Now.eventptr[E_LRTB]->date - Now.date;
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# ifdef xTRACE
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if (Trace)
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printf("E.ep = %p, ->evcode = %d, ->date = %.2f, evtime = %.2f\n",
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Now.eventptr[E_LRTB], Now.eventptr[E_LRTB]->evcode,
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Now.eventptr[E_LRTB]->date, evtime);
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# endif
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if (time > evtime && Etc.nkling < 3)
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{
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/* then we got a LRTB */
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evtime += 0.005;
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time = evtime;
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}
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else
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evtime = -1.0e50;
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dist = time * speed;
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/* move within quadrant */
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Sect[Ship.sectx][Ship.secty] = EMPTY;
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x = Ship.sectx + 0.5;
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y = Ship.secty + 0.5;
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xn = NSECTS * dist * bigger;
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n = xn + 0.5;
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# ifdef xTRACE
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if (Trace)
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printf("dx = %.2f, dy = %.2f, xn = %.2f, n = %d\n", dx, dy, xn, n);
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# endif
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Move.free = 0;
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for (i = 0; i < n; i++)
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{
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ix = (x += dx);
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iy = (y += dy);
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# ifdef xTRACE
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if (Trace)
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printf("ix = %d, x = %.2f, iy = %d, y = %.2f\n", ix, x, iy, y);
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# endif
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if (x < 0.0 || y < 0.0 || x >= sectsize || y >= sectsize)
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{
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/* enter new quadrant */
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dx = Ship.quadx * NSECTS + Ship.sectx + dx * xn;
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dy = Ship.quady * NSECTS + Ship.secty + dy * xn;
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if (dx < 0.0)
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ix = -1;
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else
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ix = dx + 0.5;
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if (dy < 0.0)
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iy = -1;
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else
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iy = dy + 0.5;
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# ifdef xTRACE
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if (Trace)
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printf("New quad: ix = %d, iy = %d\n", ix, iy);
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# endif
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Ship.sectx = x;
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Ship.secty = y;
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compkldist(0);
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Move.newquad = 2;
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attack(0);
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checkcond();
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Ship.quadx = ix / NSECTS;
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Ship.quady = iy / NSECTS;
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Ship.sectx = ix % NSECTS;
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Ship.secty = iy % NSECTS;
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if (ix < 0 || Ship.quadx >= NQUADS || iy < 0 ||
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Ship.quady >= NQUADS) {
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if (!damaged(COMPUTER)) {
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dumpme(0);
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} else
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lose(L_NEGENB);
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}
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initquad(0);
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n = 0;
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break;
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}
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if (Sect[ix][iy] != EMPTY)
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{
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/* we just hit something */
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if (!damaged(COMPUTER) && ramflag <= 0)
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{
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ix = x - dx;
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iy = y - dy;
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printf("Computer reports navigation error; %s stopped at %d,%d\n",
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Ship.shipname, ix, iy);
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Ship.energy -= Param.stopengy * speed;
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break;
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}
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/* test for a black hole */
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if (Sect[ix][iy] == HOLE)
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{
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/* get dumped elsewhere in the galaxy */
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dumpme(1);
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initquad(0);
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n = 0;
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break;
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}
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ram(ix, iy);
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break;
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}
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}
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if (n > 0)
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{
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dx = Ship.sectx - ix;
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dy = Ship.secty - iy;
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dist = sqrt(dx * dx + dy * dy) / NSECTS;
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time = dist / speed;
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if (evtime > time)
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time = evtime; /* spring the LRTB trap */
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Ship.sectx = ix;
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Ship.secty = iy;
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}
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Sect[Ship.sectx][Ship.secty] = Ship.ship;
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compkldist(0);
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return (time);
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}
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