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