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1 /* s_traf.c
2 *
3 * Micropolis, Unix Version. This game was released for the Unix platform
4 * in or about 1990 and has been modified for inclusion in the One Laptop
5 * Per Child program. Copyright (C) 1989 - 2007 Electronic Arts Inc. If
6 * you need assistance with this program, you may contact:
7 * http://wiki.laptop.org/go/Micropolis or email micropolis@laptop.org.
8 *
9 * This program is free software: you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation, either version 3 of the License, or (at
12 * your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details. You should have received a
18 * copy of the GNU General Public License along with this program. If
19 * not, see <http://www.gnu.org/licenses/>.
20 *
21 * ADDITIONAL TERMS per GNU GPL Section 7
22 *
23 * No trademark or publicity rights are granted. This license does NOT
24 * give you any right, title or interest in the trademark SimCity or any
25 * other Electronic Arts trademark. You may not distribute any
26 * modification of this program using the trademark SimCity or claim any
27 * affliation or association with Electronic Arts Inc. or its employees.
28 *
29 * Any propagation or conveyance of this program must include this
30 * copyright notice and these terms.
31 *
32 * If you convey this program (or any modifications of it) and assume
33 * contractual liability for the program to recipients of it, you agree
34 * to indemnify Electronic Arts for any liability that those contractual
35 * assumptions impose on Electronic Arts.
36 *
37 * You may not misrepresent the origins of this program; modified
38 * versions of the program must be marked as such and not identified as
39 * the original program.
40 *
41 * This disclaimer supplements the one included in the General Public
42 * License. TO THE FULLEST EXTENT PERMISSIBLE UNDER APPLICABLE LAW, THIS
43 * PROGRAM IS PROVIDED TO YOU "AS IS," WITH ALL FAULTS, WITHOUT WARRANTY
44 * OF ANY KIND, AND YOUR USE IS AT YOUR SOLE RISK. THE ENTIRE RISK OF
45 * SATISFACTORY QUALITY AND PERFORMANCE RESIDES WITH YOU. ELECTRONIC ARTS
46 * DISCLAIMS ANY AND ALL EXPRESS, IMPLIED OR STATUTORY WARRANTIES,
47 * INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY, SATISFACTORY QUALITY,
48 * FITNESS FOR A PARTICULAR PURPOSE, NONINFRINGEMENT OF THIRD PARTY
49 * RIGHTS, AND WARRANTIES (IF ANY) ARISING FROM A COURSE OF DEALING,
50 * USAGE, OR TRADE PRACTICE. ELECTRONIC ARTS DOES NOT WARRANT AGAINST
51 * INTERFERENCE WITH YOUR ENJOYMENT OF THE PROGRAM; THAT THE PROGRAM WILL
52 * MEET YOUR REQUIREMENTS; THAT OPERATION OF THE PROGRAM WILL BE
53 * UNINTERRUPTED OR ERROR-FREE, OR THAT THE PROGRAM WILL BE COMPATIBLE
54 * WITH THIRD PARTY SOFTWARE OR THAT ANY ERRORS IN THE PROGRAM WILL BE
55 * CORRECTED. NO ORAL OR WRITTEN ADVICE PROVIDED BY ELECTRONIC ARTS OR
56 * ANY AUTHORIZED REPRESENTATIVE SHALL CREATE A WARRANTY. SOME
57 * JURISDICTIONS DO NOT ALLOW THE EXCLUSION OF OR LIMITATIONS ON IMPLIED
58 * WARRANTIES OR THE LIMITATIONS ON THE APPLICABLE STATUTORY RIGHTS OF A
59 * CONSUMER, SO SOME OR ALL OF THE ABOVE EXCLUSIONS AND LIMITATIONS MAY
60 * NOT APPLY TO YOU.
61 */
62 #include "sim.h"
63
64
65 /* Traffic Generation */
66
67
68 #define MAXDIS 30
69
70 short PosStackN, SMapXStack[MAXDIS+1], SMapYStack[MAXDIS+1];
71 short LDir;
72 short Zsource;
73 short TrafMaxX, TrafMaxY;
74
75
76 /* comefrom: DoIndustrial DoCommercial DoResidential */
77 MakeTraf(int Zt)
78 {
79 short xtem, ytem;
80
81 xtem = SMapX;
82 ytem = SMapY;
83 Zsource = Zt;
84 PosStackN = 0;
85
86 #if 0
87 if ((!Rand(2)) && FindPTele()) {
88 /* printf("Telecommute!\n"); */
89 return (TRUE);
90 }
91 #endif
92
93 if (FindPRoad()) { /* look for road on zone perimeter */
94 if (TryDrive()) { /* attempt to drive somewhere */
95 SetTrafMem(); /* if sucessful, inc trafdensity */
96 SMapX = xtem;
97 SMapY = ytem;
98 return (TRUE); /* traffic passed */
99 }
100 SMapX = xtem;
101 SMapY = ytem;
102 return (FALSE); /* traffic failed */
103 }
104 else return (-1); /* no road found */
105 }
106
107
108 /* comefrom: MakeTraf */
109 SetTrafMem(void)
110 {
111 register short x, z;
112
113 for (x = PosStackN; x > 0; x--) {
114 PullPos();
115 if (TestBounds(SMapX, SMapY)) {
116 z = Map[SMapX][SMapY] & LOMASK;
117 if ((z >= ROADBASE) && (z < POWERBASE)) {
118 SimSprite *sprite;
119
120 /* check for rail */
121 z = TrfDensity[SMapX >>1][SMapY >>1];
122 z += 50;
123 if ((z > 240) &&
124 (!Rand(5))) {
125 z = 240;
126 TrafMaxX = SMapX <<4;
127 TrafMaxY = SMapY <<4;
128 if (((sprite = GetSprite(COP)) != NULL) &&
129 (sprite->control == -1)) {
130 sprite->dest_x = TrafMaxX;
131 sprite->dest_y = TrafMaxY;
132 }
133 }
134 TrfDensity[SMapX >>1][SMapY >>1] = z;
135 }
136 }
137 }
138 }
139
140
141 /* comefrom: TryGo */
142 PushPos(void)
143 {
144 PosStackN++;
145 SMapXStack[PosStackN] = SMapX;
146 SMapYStack[PosStackN] = SMapY;
147 }
148
149
150 /* comefrom: SetTrafMem */
151 PullPos(void)
152 {
153 SMapX = SMapXStack[PosStackN];
154 SMapY = SMapYStack[PosStackN];
155 PosStackN--;
156 }
157
158
159 /* comefrom: DoSPZone MakeTraf */
160 FindPRoad(void) /* look for road on edges of zone */
161 {
162 static short PerimX[12] = {-1, 0, 1, 2, 2, 2, 1, 0,-1,-2,-2,-2};
163 static short PerimY[12] = {-2,-2,-2,-1, 0, 1, 2, 2, 2, 1, 0,-1};
164 register short tx, ty, z;
165
166 for (z = 0; z < 12; z++) {
167 tx = SMapX + PerimX[z];
168 ty = SMapY + PerimY[z];
169 if (TestBounds(tx, ty)) {
170 if (RoadTest(Map[tx][ty])) {
171 SMapX = tx;
172 SMapY = ty;
173 return (TRUE);
174 }
175 }
176 }
177 return (FALSE);
178 }
179
180
181 FindPTele(void) /* look for telecommunication on edges of zone */
182 {
183 static short PerimX[12] = {-1, 0, 1, 2, 2, 2, 1, 0,-1,-2,-2,-2};
184 static short PerimY[12] = {-2,-2,-2,-1, 0, 1, 2, 2, 2, 1, 0,-1};
185 register short tx, ty, z, tile;
186
187 for (z = 0; z < 12; z++) {
188 tx = SMapX + PerimX[z];
189 ty = SMapY + PerimY[z];
190 if (TestBounds(tx, ty)) {
191 tile = Map[tx][ty] & LOMASK;
192 if ((tile >= TELEBASE) && (tile <= TELELAST)) {
193 return (TRUE);
194 }
195 }
196 }
197 return (FALSE);
198 }
199
200
201 /* comefrom: MakeTraf */
202 TryDrive(void)
203 {
204 short z;
205
206 LDir = 5;
207 for (z = 0; z < MAXDIS; z++) { /* Maximum distance to try */
208 if (TryGo(z)) { /* if it got a road */
209 if (DriveDone()) /* if destination is reached */
210 return (TRUE); /* pass */
211 } else {
212 if (PosStackN) { /* deadend , backup */
213 PosStackN--;
214 z += 3;
215 }
216 else return (FALSE); /* give up at start */
217 }
218 }
219 return (FALSE); /* gone maxdis */
220 }
221
222
223 /* comefrom: TryDrive */
224 TryGo(int z)
225 {
226 short x, rdir, realdir;
227
228 #if 0
229 rdir = Rand(3); /* XXX: Heaviest user of Rand */
230 #else
231 rdir = Rand16() & 3;
232 #endif
233 for (x = rdir; x < (rdir + 4); x++) { /* for the 4 directions */
234 realdir = x & 3;
235 if (realdir == LDir) continue; /* skip last direction */
236 if (RoadTest(GetFromMap(realdir))) {
237 MoveMapSim(realdir);
238 LDir = (realdir + 2) & 3;
239 if (z & 1) /* save pos every other move */
240 PushPos();
241 return (TRUE);
242 }
243 }
244 return (FALSE);
245 }
246
247
248 /* comefrom: TryGo DriveDone */
249 GetFromMap(int x)
250 {
251 switch (x) {
252 case 0:
253 if (SMapY > 0)
254 return (Map[SMapX][SMapY - 1] & LOMASK);
255 return (FALSE);
256 case 1:
257 if (SMapX < (WORLD_X - 1))
258 return (Map[SMapX + 1][SMapY] & LOMASK);
259 return (FALSE);
260 case 2:
261 if (SMapY < (WORLD_Y - 1))
262 return (Map[SMapX][SMapY + 1] & LOMASK);
263 return (FALSE);
264 case 3:
265 if (SMapX > 0)
266 return (Map[SMapX - 1][SMapY] & LOMASK);
267 return (FALSE);
268 default:
269 return (FALSE);
270 }
271 }
272
273
274 /* comefrom: TryDrive */
275 DriveDone(void)
276 {
277 static short TARGL[3] = {COMBASE, LHTHR, LHTHR};
278 static short TARGH[3] = {NUCLEAR, PORT, COMBASE}; /* for destinations */
279 register short x, z, l, h;
280
281 /* unwound -Don */
282 #if 0
283 for (x = 0; x < 4; x++) { /* R>C C>I I>R */
284 z = GetFromMap(x);
285 if ((z >= TARGL[Zsource]) && (z <= TARGH[Zsource]))
286 return (TRUE);
287 }
288 #else
289 l = TARGL[Zsource];
290 h = TARGH[Zsource];
291
292 if (SMapY > 0) {
293 z = Map[SMapX][SMapY - 1] & LOMASK;
294 if ((z >= l) && (z <= h))
295 return (TRUE);
296 }
297 if (SMapX < (WORLD_X - 1)) {
298 z = Map[SMapX + 1][SMapY] & LOMASK;
299 if ((z >= l) && (z <= h))
300 return (TRUE);
301 }
302 if (SMapY < (WORLD_Y - 1)) {
303 z = Map[SMapX][SMapY + 1] & LOMASK;
304 if ((z >= l) && (z <= h))
305 return (TRUE);
306 }
307 if (SMapX > 0) {
308 z = Map[SMapX - 1][SMapY] & LOMASK;
309 if ((z >= l) && (z <= h))
310 return (TRUE);
311 }
312 #endif
313
314 return (FALSE);
315 }
316
317
318 /* comefrom: TryGo FindPRoad */
319 RoadTest(int x)
320 {
321 x = x & LOMASK;
322 if (x < ROADBASE)
323 return (FALSE);
324 if (x > LASTRAIL)
325 return (FALSE);
326 if ((x >= POWERBASE) && (x < RAILHPOWERV))
327 return (FALSE);
328 return (TRUE);
329 }
330
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