4.3BSD - /usr/src/games/trek/torped.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifndef lint
   8: static char sccsid[] = "@(#)torped.c	5.1 (Berkeley) 1/29/86";
   9: #endif not lint
  10: 
  11: # include   <stdio.h>
  12: # include   "trek.h"
  13: 
  14: /*
  15: **  PHOTON TORPEDO CONTROL
  16: **
  17: **	Either one or three photon torpedoes are fired.  If three
  18: **	are fired, it is called a "burst" and you also specify
  19: **	a spread angle.
  20: **
  21: **	Torpedoes are never 100% accurate.  There is always a random
  22: **	cludge factor in their course which is increased if you have
  23: **	your shields up.  Hence, you will find that they are more
  24: **	accurate at close range.  However, they have the advantage that
  25: **	at long range they don't lose any of their power as phasers
  26: **	do, i.e., a hit is a hit is a hit, by any other name.
  27: **
  28: **	When the course spreads too much, you get a misfire, and the
  29: **	course is randomized even more.  You also have the chance that
  30: **	the misfire damages your torpedo tubes.
  31: */
  32: 
  33: 
  34: torped()
  35: {
  36:     register int        ix, iy;
  37:     double          x, y, dx, dy;
  38:     double          angle;
  39:     int         course, course2;
  40:     register int        k;
  41:     double          bigger;
  42:     double          sectsize;
  43:     int         burst;
  44:     int         n;
  45: 
  46:     if (Ship.cloaked)
  47:     {
  48:         return (printf("Federation regulations do not permit attack while cloaked.\n"));
  49:     }
  50:     if (check_out(TORPED))
  51:         return;
  52:     if (Ship.torped <= 0)
  53:     {
  54:         return (printf("All photon torpedos expended\n"));
  55:     }
  56: 
  57:     /* get the course */
  58:     course = getintpar("Torpedo course");
  59:     if (course < 0 || course > 360)
  60:         return;
  61:     burst = -1;
  62: 
  63:     /* need at least three torpedoes for a burst */
  64:     if (Ship.torped < 3)
  65:     {
  66:         printf("No-burst mode selected\n");
  67:         burst = 0;
  68:     }
  69:     else
  70:     {
  71:         /* see if the user wants one */
  72:         if (!testnl())
  73:         {
  74:             k = ungetc(cgetc(0), stdin);
  75:             if (k >= '0' && k <= '9')
  76:                 burst = 1;
  77:         }
  78:     }
  79:     if (burst < 0)
  80:     {
  81:         burst = getynpar("Do you want a burst");
  82:     }
  83:     if (burst)
  84:     {
  85:         burst = getintpar("burst angle");
  86:         if (burst <= 0)
  87:             return;
  88:         if (burst > 15)
  89:             return (printf("Maximum burst angle is 15 degrees\n"));
  90:     }
  91:     sectsize = NSECTS;
  92:     n = -1;
  93:     if (burst)
  94:     {
  95:         n = 1;
  96:         course -= burst;
  97:     }
  98:     for (; n && n <= 3; n++)
  99:     {
 100:         /* select a nice random course */
 101:         course2 = course + randcourse(n);
 102:         angle = course2 * 0.0174532925;         /* convert to radians */
 103:         dx = -cos(angle);
 104:         dy =  sin(angle);
 105:         bigger = fabs(dx);
 106:         x = fabs(dy);
 107:         if (x > bigger)
 108:             bigger = x;
 109:         dx /= bigger;
 110:         dy /= bigger;
 111:         x = Ship.sectx + 0.5;
 112:         y = Ship.secty + 0.5;
 113:         if (Ship.cond != DOCKED)
 114:             Ship.torped -= 1;
 115:         printf("Torpedo track");
 116:         if (n > 0)
 117:             printf(", torpedo number %d", n);
 118:         printf(":\n%6.1f\t%4.1f\n", x, y);
 119:         while (1)
 120:         {
 121:             ix = x += dx;
 122:             iy = y += dy;
 123:             if (x < 0.0 || x >= sectsize || y < 0.0 || y >= sectsize)
 124:             {
 125:                 printf("Torpedo missed\n");
 126:                 break;
 127:             }
 128:             printf("%6.1f\t%4.1f\n", x, y);
 129:             switch (Sect[ix][iy])
 130:             {
 131:               case EMPTY:
 132:                 continue;
 133: 
 134:               case HOLE:
 135:                 printf("Torpedo disappears into a black hole\n");
 136:                 break;
 137: 
 138:               case KLINGON:
 139:                 for (k = 0; k < Etc.nkling; k++)
 140:                 {
 141:                     if (Etc.klingon[k].x != ix || Etc.klingon[k].y != iy)
 142:                         continue;
 143:                     Etc.klingon[k].power -= 500 + ranf(501);
 144:                     if (Etc.klingon[k].power > 0)
 145:                     {
 146:                         printf("*** Hit on Klingon at %d,%d: extensive damages\n",
 147:                             ix, iy);
 148:                         break;
 149:                     }
 150:                     killk(ix, iy);
 151:                     break;
 152:                 }
 153:                 break;
 154: 
 155:               case STAR:
 156:                 nova(ix, iy);
 157:                 break;
 158: 
 159:               case INHABIT:
 160:                 kills(ix, iy, -1);
 161:                 break;
 162: 
 163:               case BASE:
 164:                 killb(Ship.quadx, Ship.quady);
 165:                 Game.killb += 1;
 166:                 break;
 167:               default:
 168:                 printf("Unknown object %c at %d,%d destroyed\n",
 169:                     Sect[ix][iy], ix, iy);
 170:                 Sect[ix][iy] = EMPTY;
 171:                 break;
 172:             }
 173:             break;
 174:         }
 175:         if (damaged(TORPED) || Quad[Ship.quadx][Ship.quady].stars < 0)
 176:             break;
 177:         course += burst;
 178:     }
 179:     Move.free = 0;
 180: }
 181: 
 182: 
 183: /*
 184: **  RANDOMIZE COURSE
 185: **
 186: **	This routine randomizes the course for torpedo number 'n'.
 187: **	Other things handled by this routine are misfires, damages
 188: **	to the tubes, etc.
 189: */
 190: 
 191: randcourse(n)
 192: int n;
 193: {
 194:     double          r;
 195:     register int        d;
 196: 
 197:     d = ((franf() + franf()) - 1.0) * 20;
 198:     if (abs(d) > 12)
 199:     {
 200:         printf("Photon tubes misfire");
 201:         if (n < 0)
 202:             printf("\n");
 203:         else
 204:             printf(" on torpedo %d\n", n);
 205:         if (ranf(2))
 206:         {
 207:             damage(TORPED, 0.2 * abs(d) * (franf() + 1.0));
 208:         }
 209:         d *= 1.0 + 2.0 * franf();
 210:     }
 211:     if (Ship.shldup || Ship.cond == DOCKED)
 212:     {
 213:         r = Ship.shield;
 214:         r = 1.0 + r / Param.shield;
 215:         if (Ship.cond == DOCKED)
 216:             r = 2.0;
 217:         d *= r;
 218:     }
 219:     return (d);
 220: }

Defined functions

Defined variables