trek/impulse.c

   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: @(#)impulse.c   5.4 (Berkeley) 6/1/90";*/
  36 static char rcsid[] = "$Id: impulse.c,v 1.2 1993/08/01 18:50:27 mycroft Exp $";
  37 #endif /* not lint */
  38
  39 # include       "trek.h"
  40
  41 /**
  42  **     move under impulse power
  43  **/
  44
  45 impulse()
  46 {
  47         int                     course;
  48         register int            power;
  49         double                  dist, time;
  50         register int            percent;
  51         extern double           move();
  52
  53         if (Ship.cond == DOCKED)
  54                 return (printf("Scotty: Sorry captain, but we are still docked.\n"));
  55         if (damaged(IMPULSE))
  56                 return (out(IMPULSE));
  57         if (getcodi(&course, &dist))
  58                 return;
  59         power = 20 + 100 * dist;
  60         percent = 100 * power / Ship.energy + 0.5;
  61         if (percent >= 85)
  62         {
  63                 printf("Scotty: That would consume %d%% of our remaining energy.\n",
  64                         percent);
  65                 if (!getynpar("Are you sure that is wise"))
  66                         return;
  67                 printf("Aye aye, sir\n");
  68         }
  69         time = dist / 0.095;
  70         percent = 100 * time / Now.time + 0.5;
  71         if (percent >= 85)
  72         {
  73                 printf("Spock: That would take %d%% of our remaining time.\n",
  74                         percent);
  75                 if (!getynpar("Are you sure that is wise"))
  76                         return;
  77                 printf("(He's finally gone mad)\n");
  78         }
  79         Move.time = move(0, course, time, 0.095);
  80         Ship.energy -= 20 + 100 * Move.time * 0.095;
  81 }