1 #ifndef lint 2 static char sccsid[] = "@(#)help.c 4.2 (Berkeley) 05/09/83"; 3 #endif not lint 4 5 # include "trek.h" 6 7 /* 8 ** call starbase for help 9 ** 10 ** First, the closest starbase is selected. If there is a 11 ** a starbase in your own quadrant, you are in good shape. 12 ** This distance takes quadrant distances into account only. 13 ** 14 ** A magic number is computed based on the distance which acts 15 ** as the probability that you will be rematerialized. You 16 ** get three tries. 17 ** 18 ** When it is determined that you should be able to be remater- 19 ** ialized (i.e., when the probability thing mentioned above 20 ** comes up positive), you are put into that quadrant (anywhere). 21 ** Then, we try to see if there is a spot adjacent to the star- 22 ** base. If not, you can't be rematerialized!!! Otherwise, 23 ** it drops you there. It only tries five times to find a spot 24 ** to drop you. After that, it's your problem. 25 */ 26 27 char *Cntvect[3] = 28 {"first", "second", "third"}; 29 30 help() 31 { 32 register int i; 33 double dist, x; 34 register int dx, dy; 35 int j, l; 36 37 /* check to see if calling for help is reasonable ... */ 38 if (Ship.cond == DOCKED) 39 return (printf("Uhura: But Captain, we're already docked\n")); 40 41 /* or possible */ 42 if (damaged(SSRADIO)) 43 return (out(SSRADIO)); 44 if (Now.bases <= 0) 45 return (printf("Uhura: I'm not getting any response from starbase\n")); 46 47 /* tut tut, there goes the score */ 48 Game.helps += 1; 49 50 /* find the closest base */ 51 dist = 1e50; 52 if (Quad[Ship.quadx][Ship.quady].bases <= 0) 53 { 54 /* there isn't one in this quadrant */ 55 for (i = 0; i < Now.bases; i++) 56 { 57 /* compute distance */ 58 dx = Now.base[i].x - Ship.quadx; 59 dy = Now.base[i].y - Ship.quady; 60 x = dx * dx + dy * dy; 61 x = sqrt(x); 62 63 /* see if better than what we already have */ 64 if (x < dist) 65 { 66 dist = x; 67 l = i; 68 } 69 } 70 71 /* go to that quadrant */ 72 Ship.quadx = Now.base[l].x; 73 Ship.quady = Now.base[l].y; 74 initquad(1); 75 } 76 else 77 { 78 dist = 0.0; 79 } 80 81 /* dematerialize the Enterprise */ 82 Sect[Ship.sectx][Ship.secty] = EMPTY; 83 printf("Starbase in %d,%d responds\n", Ship.quadx, Ship.quady); 84 85 /* this next thing acts as a probability that it will work */ 86 x = pow(1.0 - pow(0.94, dist), 0.3333333); 87 88 /* attempt to rematerialize */ 89 for (i = 0; i < 3; i++) 90 { 91 sleep(2); 92 printf("%s attempt to rematerialize ", Cntvect[i]); 93 if (franf() > x) 94 { 95 /* ok, that's good. let's see if we can set her down */ 96 for (j = 0; j < 5; j++) 97 { 98 dx = Etc.starbase.x + ranf(3) - 1; 99 if (dx < 0 || dx >= NSECTS) 100 continue; 101 dy = Etc.starbase.y + ranf(3) - 1; 102 if (dy < 0 || dy >= NSECTS || Sect[dx][dy] != EMPTY) 103 continue; 104 break; 105 } 106 if (j < 5) 107 { 108 /* found an empty spot */ 109 printf("succeeds\n"); 110 Ship.sectx = dx; 111 Ship.secty = dy; 112 Sect[dx][dy] = Ship.ship; 113 dock(); 114 compkldist(0); 115 return; 116 } 117 /* the starbase must have been surrounded */ 118 } 119 printf("fails\n"); 120 } 121 122 /* one, two, three strikes, you're out */ 123 lose(L_NOHELP); 124 } 125