src/trains.cpp

   1 /*
   2 Copyright (C) 2004-2011 Parallel Realities
   3 Copyright (C) 2011-2015 Perpendicular Dimensions
   4
   5 This program is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU General Public License
   7 as published by the Free Software Foundation; either version 2
   8 of the License, or (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13
  14 See the GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20 */
  21
  22 #include "trains.h"
  23
  24 /**
  25 * Opens a door and converts it into a normal door (TR_DOOR)
  26 * at the same time. Uses up keys if needed
  27 * @param train The door to open.
  28 */
  29 void openDoor(Train *train)
  30 {
  31         if (train->active)
  32         {
  33                 return;
  34         }
  35
  36         switch (train->type)
  37         {
  38                 case TR_GOLD_DOOR:
  39                 case TR_GOLD_SLIDEDOOR:
  40                         engine.setInfoMessage("Used Gold Key", 1, INFO_NORMAL);
  41                         break;
  42                 case TR_SILVER_DOOR:
  43                 case TR_SILVER_SLIDEDOOR:
  44                         engine.setInfoMessage("Used Silver Key", 1, INFO_NORMAL);
  45                         break;
  46                 case TR_BRONZE_DOOR:
  47                 case TR_BRONZE_SLIDEDOOR:
  48                         engine.setInfoMessage("Used Bronze Key", 1, INFO_NORMAL);
  49                         break;
  50         }
  51
  52         if ((train->type != TR_LOCKED_DOOR) && (train->type != TR_LOCKED_SLIDEDOOR))
  53         {
  54                 if (train->type < TR_SLIDEDOOR)
  55                 {
  56                         train->type = TR_DOOR;
  57                 }
  58                 else
  59                 {
  60                         train->type = TR_SLIDEDOOR;
  61                 }
  62         }
  63
  64         train->active = true;
  65
  66         audio.playSound(SND_OPENDOOR, CH_TOUCH);
  67 }
  68
  69 /**
  70 * Blocks an entity from moving any further and shows
  71 * a message for the reason the door would not open
  72 * @param ent The entity to block
  73 * @param message The message to show when blocking the Player
  74 * @param train The door that performs the blocking
  75 * @param dir The direction the entity was moving in (required for clipping)
  76 */
  77 void trainBlockEntity(Entity *ent, const char *message, Train *train, int dir)
  78 {
  79         if (ent == &player)
  80         {
  81                 if ((train->isReady()) && (!train->active))
  82                 {
  83                         engine.setInfoMessage(message, 1, INFO_NORMAL);
  84                         audio.playSound(SND_LOCKEDDOOR, CH_TOUCH);
  85                 }
  86         }
  87
  88         if ((ent->flags & ENT_BULLET) && (!(ent->flags & ENT_BOUNCES)))
  89         {
  90                 if (dir == 0)
  91                 {
  92                         if (ent->dx < 0) ent->x = train->x + train->sprite->image[0]->w;
  93                         if (ent->dx > 0) ent->x = train->x - ent->width;
  94                 }
  95         }
  96
  97         if (dir == 1)
  98         {
  99                 if ((ent->dy >= 0) && (train->type >= TR_SLIDEDOOR))
 100                 {
 101                         ent->dy = 0;
 102                         ent->falling = false;
 103                 }
 104         }
 105 }
 106
 107 /**
 108 * Checks to see if an entity has touched this train. Depending on
 109 * the trains status certain other functions will be invoked
 110 * @param ent The entity to test
 111 * @param dir The direction the entity was moving in
 112 * @return Whether a collision took place
 113 */
 114 bool checkTrainContact(Entity *ent, int dir)
 115 {
 116         Train *train = (Train*)map.trainList.getHead();
 117
 118         bool collision = false;
 119         int x, y, mapAttribute;
 120
 121         while (train->next != NULL)
 122         {
 123                 train = (Train*)train->next;
 124
 125                 if (dir == 0)
 126                 {
 127                         collision = (Collision::collision(ent->x + ent->dx, ent->y, ent->width, ent->height - 1, train->x, train->y, train->width, train->height));
 128                 }
 129                 else
 130                 {
 131                         collision = (Collision::collision(ent->x, ent->y + ent->dy, ent->width, ent->height - 1, train->x, train->y, train->width, train->height));
 132                 }
 133
 134                 if (collision)
 135                 {
 136                         switch (train->type)
 137                         {
 138                                 case TR_TRAIN:
 139                                         if (ent->flags & ENT_BULLET)
 140                                         {
 141                                                 return true;
 142                                         }
 143
 144                                         if (ent->flags & ENT_FLIES)
 145                                         {
 146                                                 return false;
 147                                         }
 148
 149                                         if ((ent == &player) && (train->waitsForPlayer()))
 150                                         {
 151                                                 train->active = true;
 152                                         }
 153
 154                                         x = (int)(ent->x + ent->dx) >> BRICKSHIFT;
 155                                         y = (int)(ent->y + ent->height - 1) >> BRICKSHIFT;
 156
 157                                         mapAttribute = map.data[x][y];
 158
 159                                         evaluateMapAttribute(ent, mapAttribute);
 160
 161                                         if (ent->dy >= 0)
 162                                         {
 163                                                 if (train->active)
 164                                                 {
 165                                                         if (!map.isIceLevel)
 166                                                         {
 167                                                                 ent->x -= train->getDX();
 168                                                         }
 169                                                 }
 170
 171                                                 ent->dy = 1;
 172
 173                                                 ent->y = train->y;
 174                                                 ent->y -= ent->height;
 175
 176                                                 ent->falling = false;
 177                                         }
 178
 179                                         break;
 180
 181                                 case TR_DOOR:
 182                                 case TR_SLIDEDOOR:
 183                                         if (!(ent->flags & ENT_BULLET))
 184                                         {
 185                                                 openDoor(train);
 186                                         }
 187
 188                                         if (dir == 1)
 189                                         {
 190                                                 ent->dy = 0;
 191                                                 ent->falling = false;
 192                                         }
 193                                         return true;
 194                                         break;
 195
 196                                 case TR_LOCKED_DOOR:
 197                                 case TR_LOCKED_SLIDEDOOR:
 198                                         trainBlockEntity(ent, "Door is locked", train, dir);
 199                                         return true;
 200                                         break;
 201
 202                                 case TR_GOLD_DOOR:
 203                                 case TR_GOLD_SLIDEDOOR:
 204                                         if ((ent == &player) && (carryingItem("Gold Key")))
 205                                         {
 206                                                 openDoor(train);
 207                                         }
 208                                         else
 209                                         {
 210                                                 trainBlockEntity(ent, "Gold Key Required", train, dir);
 211                                         }
 212                                         return true;
 213                                         break;
 214
 215                                 case TR_SILVER_DOOR:
 216                                 case TR_SILVER_SLIDEDOOR:
 217                                         if ((ent == &player) && (carryingItem("Silver Key")))
 218                                         {
 219                                                 openDoor(train);
 220                                         }
 221                                         else
 222                                         {
 223                                                 trainBlockEntity(ent, "Silver Key Required", train, dir);
 224                                         }
 225                                         return true;
 226                                         break;
 227
 228                                 case TR_BRONZE_DOOR:
 229                                 case TR_BRONZE_SLIDEDOOR:
 230                                         if ((ent == &player) && (carryingItem("Bronze Key")))
 231                                         {
 232                                                 openDoor(train);
 233                                         }
 234                                         else
 235                                         {
 236                                                 trainBlockEntity(ent, "Bronze Key Required", train, dir);
 237                                         }
 238                                         return true;
 239                                         break;
 240                         }
 241                 }
 242         }
 243
 244         return false;
 245 }
 246
 247 /**
 248 * Lazy way of setting the sprite for the train
 249 * @param train The train to set the Sprite for
 250 */
 251 void setTrainSprite(Train *train)
 252 {
 253         switch (train->type)
 254         {
 255                 case TR_TRAIN:
 256                         train->sprite = graphics.getSprite("Platform", true);
 257                         break;
 258                 case TR_DOOR:
 259                 case TR_LOCKED_DOOR:
 260                         train->sprite = graphics.getSprite("NormalDoor", true);
 261                         break;
 262                 case TR_GOLD_DOOR:
 263                         train->sprite = graphics.getSprite("GoldDoor", true);
 264                         break;
 265                 case TR_SILVER_DOOR:
 266                         train->sprite = graphics.getSprite("SilverDoor", true);
 267                         break;
 268                 case TR_BRONZE_DOOR:
 269                         train->sprite = graphics.getSprite("BronzeDoor", true);
 270                         break;
 271                 case TR_SLIDEDOOR:
 272                 case TR_LOCKED_SLIDEDOOR:
 273                         train->sprite = graphics.getSprite("SlideDoor", true);
 274                         break;
 275                 case TR_GOLD_SLIDEDOOR:
 276                         train->sprite = graphics.getSprite("GoldSlideDoor", true);
 277                         break;
 278                 case TR_SILVER_SLIDEDOOR:
 279                         train->sprite = graphics.getSprite("SilverSlideDoor", true);
 280                         break;
 281                 case TR_BRONZE_SLIDEDOOR:
 282                         train->sprite = graphics.getSprite("BronzeSlideDoor", true);
 283                         break;
 284         }
 285 }
 286
 287 /**
 288 * Checks to see if a door has attempted to open or close on the Player
 289 * or an enemy
 290 * @param train The door to perform the check on
 291 * @return Whether an entity was in the path of the door
 292 */
 293 bool doorClosedOnEntity(Train *train)
 294 {
 295         // allow entities to stand on an horizontal moving door without blocking its movement.
 296         int y = (train->type < TR_SLIDEDOOR) ? (int)train->y : (int)train->y + 1;
 297
 298         if (Collision::collision(player.x, player.y, player.width, player.height, train->x, y, train->width, train->height))
 299         {
 300                 return true;
 301         }
 302
 303         Entity *enemy = (Entity*)map.enemyList.getHead();
 304
 305         while (enemy->next != NULL)
 306         {
 307                 enemy = (Entity*)enemy->next;
 308
 309                 if (Collision::collision(enemy->x, enemy->y, enemy->width, enemy->height, train->x, y, train->width, train->height))
 310                 {
 311                         return true;
 312                 }
 313         }
 314
 315         return false;
 316 }
 317
 318 /**
 319 * Peforms actions for all the trains on the level. Moves them, etc.
 320 */
 321 void doTrains()
 322 {
 323         Train *train = (Train*)map.trainList.getHead();
 324
 325         int x, y, oldX, oldY;
 326         int playSound = false;
 327
 328         while (train->next != NULL)
 329         {
 330                 train = (Train*)train->next;
 331
 332                 x = (int)(train->x - engine.playerPosX);
 333                 y = (int)(train->y - engine.playerPosY);
 334
 335                 if ((train->type == TR_TRAIN) && (train->active))
 336                 {
 337                         train->move();
 338                 }
 339
 340                 if (train->type != TR_TRAIN)
 341                 {
 342                         oldX = (int)train->x;
 343                         oldY = (int)train->y;
 344                         playSound = false;
 345
 346                         playSound = train->openClose();
 347
 348                         // only check if the door actually moved(!)
 349                         if ((oldX != (int)train->x) || (oldY != (int)train->y))
 350                         {
 351                                 if (doorClosedOnEntity(train))
 352                                 {
 353                                         train->x = oldX;
 354                                         train->y = oldY;
 355                                 }
 356                                 else if (playSound)
 357                                 {
 358                                         audio.playSound(SND_DOOROPENED, CH_TOUCH);
 359                                 }
 360                         }
 361                 }
 362
 363                 if (train->sprite == NULL)
 364                 {
 365                         setTrainSprite(train);
 366                 }
 367
 368                 if ((abs(x) <= 800) && (abs(y) <= 600))
 369                 {
 370                         graphics.blit(train->sprite->getCurrentFrame(), x, y, graphics.screen, false);
 371                 }
 372         }
 373 }