2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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
;