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, train->x);
  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, train->x);
  85                 }
  86         }
  87
  88         if ((ent->flags & ENT_BULLET) && (!(ent->flags & ENT_BOUNCES)))
  89         {
  90                 if (dir & DIR_X)
  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 & DIR_Y)
  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 == DIR_X)
 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 if (dir == DIR_Y)
 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                 else
 134                 {
 135                         collision = (Collision::collision(ent->x + ent->dx, ent->y + ent->dy, ent->width, ent->height - 1, train->x, train->y, train->width, train->height));
 136                 }
 137
 138                 if (collision)
 139                 {
 140                         switch (train->type)
 141                         {
 142                                 case TR_TRAIN:
 143                                         if (ent->flags & ENT_BULLET)
 144                                         {
 145                                                 return true;
 146                                         }
 147
 148                                         if (ent->flags & ENT_FLIES)
 149                                         {
 150                                                 return false;
 151                                         }
 152
 153                                         if ((ent == &player) && (train->waitsForPlayer()))
 154                                         {
 155                                                 train->active = true;
 156                                         }
 157
 158                                         x = (int)(ent->x + ent->dx) >> BRICKSHIFT;
 159                                         y = (int)(ent->y + ent->height - 1) >> BRICKSHIFT;
 160
 161                                         mapAttribute = map.data[x][y];
 162
 163                                         evaluateMapAttribute(ent, mapAttribute);
 164
 165                                         if (ent->dy >= 0)
 166                                         {
 167                                                 if (train->active)
 168                                                 {
 169                                                         if (!map.isIceLevel)
 170                                                         {
 171                                                                 ent->x -= train->getDX();
 172                                                         }
 173                                                 }
 174
 175                                                 ent->dy = 1;
 176
 177                                                 ent->y = train->y;
 178                                                 ent->y -= ent->height;
 179
 180                                                 ent->falling = false;
 181                                         }
 182
 183                                         break;
 184
 185                                 case TR_DOOR:
 186                                 case TR_SLIDEDOOR:
 187                                         if (!(ent->flags & ENT_BULLET))
 188                                         {
 189                                                 openDoor(train);
 190                                         }
 191
 192                                         if (dir & DIR_Y)
 193                                         {
 194                                                 ent->dy = 0;
 195                                                 ent->falling = false;
 196                                         }
 197                                         return true;
 198                                         break;
 199
 200                                 case TR_LOCKED_DOOR:
 201                                 case TR_LOCKED_SLIDEDOOR:
 202                                         trainBlockEntity(ent, "Door is locked", train, dir);
 203                                         return true;
 204                                         break;
 205
 206                                 case TR_GOLD_DOOR:
 207                                 case TR_GOLD_SLIDEDOOR:
 208                                         if ((ent == &player) && (carryingItem("Gold Key")))
 209                                         {
 210                                                 openDoor(train);
 211                                         }
 212                                         else
 213                                         {
 214                                                 trainBlockEntity(ent, "Gold Key Required", train, dir);
 215                                         }
 216                                         return true;
 217                                         break;
 218
 219                                 case TR_SILVER_DOOR:
 220                                 case TR_SILVER_SLIDEDOOR:
 221                                         if ((ent == &player) && (carryingItem("Silver Key")))
 222                                         {
 223                                                 openDoor(train);
 224                                         }
 225                                         else
 226                                         {
 227                                                 trainBlockEntity(ent, "Silver Key Required", train, dir);
 228                                         }
 229                                         return true;
 230                                         break;
 231
 232                                 case TR_BRONZE_DOOR:
 233                                 case TR_BRONZE_SLIDEDOOR:
 234                                         if ((ent == &player) && (carryingItem("Bronze Key")))
 235                                         {
 236                                                 openDoor(train);
 237                                         }
 238                                         else
 239                                         {
 240                                                 trainBlockEntity(ent, "Bronze Key Required", train, dir);
 241                                         }
 242                                         return true;
 243                                         break;
 244                         }
 245                 }
 246         }
 247
 248         return false;
 249 }
 250
 251 /**
 252 * Lazy way of setting the sprite for the train
 253 * @param train The train to set the Sprite for
 254 */
 255 void setTrainSprite(Train *train)
 256 {
 257         switch (train->type)
 258         {
 259                 case TR_TRAIN:
 260                         train->sprite = graphics.getSprite("Platform", true);
 261                         break;
 262                 case TR_DOOR:
 263                 case TR_LOCKED_DOOR:
 264                         train->sprite = graphics.getSprite("NormalDoor", true);
 265                         break;
 266                 case TR_GOLD_DOOR:
 267                         train->sprite = graphics.getSprite("GoldDoor", true);
 268                         break;
 269                 case TR_SILVER_DOOR:
 270                         train->sprite = graphics.getSprite("SilverDoor", true);
 271                         break;
 272                 case TR_BRONZE_DOOR:
 273                         train->sprite = graphics.getSprite("BronzeDoor", true);
 274                         break;
 275                 case TR_SLIDEDOOR:
 276                 case TR_LOCKED_SLIDEDOOR:
 277                         train->sprite = graphics.getSprite("SlideDoor", true);
 278                         break;
 279                 case TR_GOLD_SLIDEDOOR:
 280                         train->sprite = graphics.getSprite("GoldSlideDoor", true);
 281                         break;
 282                 case TR_SILVER_SLIDEDOOR:
 283                         train->sprite = graphics.getSprite("SilverSlideDoor", true);
 284                         break;
 285                 case TR_BRONZE_SLIDEDOOR:
 286                         train->sprite = graphics.getSprite("BronzeSlideDoor", true);
 287                         break;
 288         }
 289 }
 290
 291 /**
 292 * Checks to see if a door has attempted to open or close on the Player
 293 * or an enemy
 294 * @param train The door to perform the check on
 295 * @return Whether an entity was in the path of the door
 296 */
 297 bool doorClosedOnEntity(Train *train)
 298 {
 299         // allow entities to stand on an horizontal moving door without blocking its movement.
 300         int y = (train->type < TR_SLIDEDOOR) ? (int)train->y : (int)train->y + 1;
 301
 302         if (Collision::collision(player.x, player.y, player.width, player.height, train->x, y, train->width, train->height))
 303         {
 304                 return true;
 305         }
 306
 307         Entity *enemy = (Entity*)map.enemyList.getHead();
 308
 309         while (enemy->next != NULL)
 310         {
 311                 enemy = (Entity*)enemy->next;
 312
 313                 if (Collision::collision(enemy->x, enemy->y, enemy->width, enemy->height, train->x, y, train->width, train->height))
 314                 {
 315                         return true;
 316                 }
 317         }
 318
 319         return false;
 320 }
 321
 322 /**
 323 * Peforms actions for all the trains on the level. Moves them, etc.
 324 */
 325 void doTrains()
 326 {
 327         Train *train = (Train*)map.trainList.getHead();
 328
 329         int x, y, oldX, oldY;
 330         int playSound = false;
 331
 332         while (train->next != NULL)
 333         {
 334                 train = (Train*)train->next;
 335
 336                 x = (int)(train->x - engine.playerPosX);
 337                 y = (int)(train->y - engine.playerPosY);
 338
 339                 if ((train->type == TR_TRAIN) && (train->active))
 340                 {
 341                         train->move();
 342                 }
 343
 344                 if (train->type != TR_TRAIN)
 345                 {
 346                         oldX = (int)train->x;
 347                         oldY = (int)train->y;
 348                         playSound = false;
 349
 350                         playSound = train->openClose();
 351
 352                         // only check if the door actually moved(!)
 353                         if ((oldX != (int)train->x) || (oldY != (int)train->y))
 354                         {
 355                                 if (doorClosedOnEntity(train))
 356                                 {
 357                                         train->x = oldX;
 358                                         train->y = oldY;
 359                                 }
 360                                 else if (playSound)
 361                                 {
 362                                         audio.playSound(SND_DOOROPENED, CH_TOUCH, train->x);
 363                                 }
 364                         }
 365                 }
 366
 367                 if (train->sprite == NULL)
 368                 {
 369                         setTrainSprite(train);
 370                 }
 371
 372                 if ((abs(x) <= 800) && (abs(y) <= 600))
 373                 {
 374                         graphics.blit(train->sprite->getCurrentFrame(), x, y, graphics.screen, false);
 375                 }
 376         }
 377 }