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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