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29 * @(#)move.c 8.1 (Berkeley) 5/31/93
30 * $FreeBSD: src/games/trek/move.c,v 1.6 1999/11/30 03:49:50 billf Exp $
31 * $DragonFly: src/games/trek/move.c,v 1.3 2006/09/07 21:19:44 pavalos Exp $
37 ** Move Under Warp or Impulse Power
39 ** `Ramflag' is set if we are to be allowed to ram stars,
40 ** Klingons, etc. This is passed from warp(), which gets it from
41 ** either play() or ram(). Course is the course (0 -> 360) at
42 ** which we want to move. `Speed' is the speed we
43 ** want to go, and `p_time' is the expected time. It
44 ** can get cut short if a long range tractor beam is to occur. We
45 ** cut short the move so that the user doesn't get docked time and
46 ** energy for distance which he didn't travel.
48 ** We check the course through the current quadrant to see that he
49 ** doesn't run into anything. After that, though, space sort of
50 ** bends around him. Note that this puts us in the awkward posi-
51 ** tion of being able to be dropped into a sector which is com-
52 ** pletely surrounded by stars. Oh Well.
54 ** If the SINS (Space Inertial Navigation System) is out, we ran-
55 ** domize the course accordingly before ever starting to move.
56 ** We will still move in a straight line.
58 ** Note that if your computer is out, you ram things anyway. In
59 ** other words, if your computer and sins are both out, you're in
60 ** potentially very bad shape.
62 ** Klingons get a chance to zap you as you leave the quadrant.
63 ** By the way, they also try to follow you (heh heh).
65 ** Return value is the actual amount of time used.
72 move(int ramflag, int course, double p_time, double speed)
88 printf("move: ramflag %d course %d time %.2f speed %.2f\n",
89 ramflag, course, p_time, speed);
92 /* initialize delta factors for move */
93 angle = course * 0.0174532925;
95 angle += Param.navigcrud[1] * (franf() - 0.5);
98 angle += Param.navigcrud[0] * (franf() - 0.5);
108 /* check for long range tractor beams */
109 /**** TEMPORARY CODE == DEBUGGING ****/
110 evtime = Now.eventptr[E_LRTB]->date - Now.date;
113 printf("E.ep = %p, ->evcode = %d, ->date = %.2f, evtime = %.2f\n",
114 (void *)Now.eventptr[E_LRTB],
115 Now.eventptr[E_LRTB]->evcode,
116 Now.eventptr[E_LRTB]->date, evtime);
118 if (p_time > evtime && Etc.nkling < 3) {
119 /* then we got a LRTB */
124 dist = p_time * speed;
126 /* move within quadrant */
127 Sect[Ship.sectx][Ship.secty] = EMPTY;
128 x = Ship.sectx + 0.5;
129 y = Ship.secty + 0.5;
130 xn = NSECTS * dist * bigger;
134 printf("dx = %.2f, dy = %.2f, xn = %.2f, n = %d\n", dx, dy, xn, n);
138 for (i = 0; i < n; i++) {
143 printf("ix = %d, x = %.2f, iy = %d, y = %.2f\n", ix, x, iy, y);
145 if (x < 0.0 || y < 0.0 || x >= sectsize || y >= sectsize) {
146 /* enter new quadrant */
147 dx = Ship.quadx * NSECTS + Ship.sectx + dx * xn;
148 dy = Ship.quady * NSECTS + Ship.secty + dy * xn;
159 printf("New quad: ix = %d, iy = %d\n", ix, iy);
167 Ship.quadx = ix / NSECTS;
168 Ship.quady = iy / NSECTS;
169 Ship.sectx = ix % NSECTS;
170 Ship.secty = iy % NSECTS;
171 if (ix < 0 || Ship.quadx >= NQUADS || iy < 0 ||
172 Ship.quady >= NQUADS) {
173 if (!damaged(COMPUTER)) {
182 if (Sect[ix][iy] != EMPTY) {
183 /* we just hit something */
184 if (!damaged(COMPUTER) && ramflag <= 0) {
187 printf("Computer reports navigation error; %s stopped at %d,%d\n",
188 Ship.shipname, ix, iy);
189 Ship.energy -= Param.stopengy * speed;
192 /* test for a black hole */
193 if (Sect[ix][iy] == HOLE) {
194 /* get dumped elsewhere in the galaxy */
205 dx = Ship.sectx - ix;
206 dy = Ship.secty - iy;
207 dist = sqrt(dx * dx + dy * dy) / NSECTS;
208 p_time = dist / speed;
210 p_time = evtime; /* spring the LRTB trap */
214 Sect[Ship.sectx][Ship.secty] = Ship.ship;