src/traps.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 "traps.h"
  23
  24 /**
  25 * Adds a trap to the map
  26 * @param name The name of the trap group
  27 * @param trapType The type of trap this is
  28 * @param damage The damage the trap does
  29 * @param speed The speed at which the trap moves
  30 * @param startY The starting X location of the trap
  31 * @param startY The starting Y location of the trap
  32 * @param startY The ending X location of the trap
  33 * @param startY The ending Y location of the trap
  34 * @param wait1 The first state wait time
  35 * @param wait2 The second state wait time
  36 * @param sprite The Sprite to use with this trap
  37 * @param active The active state of this trap
  38 */
  39 void addTrap(const char *name, int trapType, int damage, int speed, int startX, int startY, int endX, int endY, int wait1, int wait2, const char *sprite, bool active)
  40 {
  41         Trap *trap = new Trap();
  42
  43         trap->setName(name);
  44         trap->setTrapType(trapType);
  45         trap->setDamage(damage);
  46         trap->setSpeed(speed);
  47         trap->setDestinations(startX, startY, endX, endY);
  48
  49         if (wait1 == -1) wait1 = Math::rrand(10, 60);
  50         if (wait2 == -1) wait2 = Math::rrand(10, 60);
  51
  52         trap->setWaitTimes(wait1, wait2);
  53         trap->setSprite(graphics.getSprite(sprite, true));
  54         trap->active = active;
  55
  56         if (trap->type == TRAP_TYPE_BARRIER)
  57         {
  58                 trap->currentAction = TRAP_FIRSTACTION;
  59                 trap->thinktime = wait1;
  60                 if (trap->thinktime == 0)
  61                         trap->thinktime = 1;
  62         }
  63
  64         map.addTrap(trap);
  65 }
  66
  67 /**
  68 * Toggles the active state of a trap
  69 * @param The trap to toggle
  70 */
  71 void toggleTrap(Trap *trap)
  72 {
  73         trap->active = !trap->active;
  74
  75         if (trap->type == TRAP_TYPE_MINE)
  76         {
  77                 if (trap->active)
  78                 {
  79                         trap->setSprite(graphics.getSprite("ActiveMine", true));
  80                 }
  81                 else
  82                 {
  83                         trap->setSprite(graphics.getSprite("InActiveMine", true));
  84                 }
  85         }
  86 }
  87
  88 /**
  89 * Draws the chain link for the spiked ball traps.
  90 * @param trap The trap that the chain link should be drawn from
  91 */
  92 void drawTrapChain(Trap *trap)
  93 {
  94         float x = trap->startX;
  95         float y = trap->startY;
  96         int tx = (int)trap->x + (trap->sprite->image[0]->w / 2);
  97         int ty = (int)trap->y + (trap->sprite->image[0]->h / 2);
  98         float dx, dy;
  99
 100         Math::calculateSlope(tx, ty, trap->startX, trap->startY, &dx, &dy);
 101
 102         dx *= 7;
 103         dy *= 7;
 104
 105         SDL_Surface *chainLink = graphics.getSprite("ChainLink", true)->getCurrentFrame();
 106
 107         if ((dx == 0) && (dy == 0))
 108                 return;
 109
 110         while (true)
 111         {
 112                 graphics.blit(chainLink, (int)(x - engine.playerPosX), (int)(y - engine.playerPosY), graphics.screen, true);
 113
 114                 x += dx;
 115                 y += dy;
 116
 117                 if (Collision::collision(x, y, 3, 3, tx, ty, 4, 4))
 118                         break;
 119         }
 120 }
 121
 122 /**
 123 * Checks for a trap colliding with enemies or the Player
 124 * @param trap The trap to perform the check
 125 * @return Whether the trap made contact with an enemy or the Player
 126 */
 127 bool doTrapCollisions(Trap *trap)
 128 {
 129         bool hit = false;
 130
 131         if ((trap->type == TRAP_TYPE_SPIKE) && (trap->currentAction != TRAP_FIRSTACTION))
 132         {
 133                 return false;
 134         }
 135
 136         Entity *enemy = (Entity*)map.enemyList.getHead();
 137
 138         while (enemy->next != NULL)
 139         {
 140                 enemy = (Entity*)enemy->next;
 141
 142                 if (Collision::collision(trap->x, trap->y, trap->width, trap->height, enemy->x, enemy->y, enemy->width, enemy->height))
 143                 {
 144                         throwAndDamageEntity(enemy, trap->damage, -5, 5, -8);
 145                         hit = true;
 146                 }
 147         }
 148
 149         if ((player.immune > 0) && (player.immune <= 120))
 150         {
 151                 return hit;
 152         }
 153
 154         if (Collision::collision(trap->x, trap->y, trap->width, trap->height, player.x, player.y, player.width, player.height))
 155         {
 156                 throwAndDamageEntity(&player, trap->damage, -5, 5, -8);
 157
 158                 if (trap->damage == 10)
 159                 {
 160                         player.health = 0;
 161                 }
 162
 163                 if (trap->type == TRAP_TYPE_MINE)
 164                 {
 165                         for (int i = 0 ; i < 10 ; i++)
 166                         {
 167                                 addExplosion(trap->x + Math::rrand(-15, 15), trap->y + Math::rrand(-15, 15), 50, &engine.world);
 168                         }
 169                 }
 170                 hit = true;
 171         }
 172
 173         return hit;
 174 }
 175
 176 /**
 177 * Loops through all the traps and makes them do their thing according
 178 * to the type of trap that they are
 179 */
 180 void doTraps()
 181 {
 182         Trap *trap = (Trap*)map.trapList.getHead();
 183         Trap *previous = trap;
 184
 185         bool remove = false;
 186         int x, y, mx, my;
 187         unsigned int absX, absY;
 188
 189         while (trap->next != NULL)
 190         {
 191                 trap = (Trap*)trap->next;
 192
 193                 x = (int)(trap->x - engine.playerPosX);
 194                 y = (int)(trap->y - engine.playerPosY);
 195
 196                 if (trap->type == TRAP_TYPE_SWING)
 197                 {
 198                         absX = abs(x - trap->endX);
 199                         absY = abs(y - trap->endY);
 200                 }
 201                 else
 202                 {
 203                         absX = abs(x);
 204                         absY = abs(y);
 205                 }
 206
 207                 /*
 208                         Barrier traps must be do at all times. Otherwise there is an "break" in the
 209                         line if more than one barrier is used over a large space and the barrier becomes
 210                         inconsistant.
 211                 */
 212
 213                 if (((absX < 800) && (absY < 600)) || (trap->type == TRAP_TYPE_BARRIER) || (trap->type == TRAP_TYPE_FLAME))
 214                 {
 215                         remove = false;
 216
 217                         if ((trap->think()) && (trap->active))
 218                         {
 219                                 switch (trap->type)
 220                                 {
 221                                         case TRAP_TYPE_MINE:
 222                                                 audio.playSound(SND_ROCKET, CH_SPAWN, trap->x);
 223                                                 break;
 224                                         case TRAP_TYPE_SPIKE:
 225                                                 audio.playSound(SND_ROCKET, CH_SPAWN, trap->x);
 226                                                 break;
 227                                         case TRAP_TYPE_SWING:
 228                                                 audio.playSound(SND_THROW, CH_SPAWN, trap->x);
 229                                                 break;
 230                                         case TRAP_TYPE_BARRIER:
 231                                                 if ((absX <= 640) && (absY <= 480))
 232                                                 {
 233                                                         audio.playSound(SND_ELECTRICITY1 + Math::prand() % 3, CH_SPAWN, trap->x);
 234                                                 }
 235                                                 break;
 236                                         case TRAP_TYPE_FLAME:
 237                                                 if ((absX <= 640) && (absY <= 480))
 238                                                 {
 239                                                         audio.playSound(SND_FIRECRACKLE, CH_SPAWN, trap->x);
 240                                                 }
 241                                                 break;
 242                                 }
 243                         }
 244
 245                         if (trap->type == TRAP_TYPE_MINE)
 246                         {
 247                                 mx = (int)trap->x >> BRICKSHIFT;
 248                                 my = (int)(trap->y + trap->dy + trap->sprite->image[0]->h) >> BRICKSHIFT;
 249
 250                                 if (map.isSolid(mx, my))
 251                                 {
 252                                         trap->y = (my * BRICKSIZE) - trap->sprite->image[0]->h;
 253                                         trap->dy = 0;
 254                                 }
 255                         }
 256
 257                         if (trap->type == TRAP_TYPE_SWING)
 258                         {
 259                                 drawTrapChain(trap);
 260                         }
 261
 262                         switch (trap->type)
 263                         {
 264                                 case TRAP_TYPE_FLAME:
 265
 266                                         graphics.blit(trap->sprite->getCurrentFrame(), x, y, graphics.screen, true);
 267
 268                                         if ((absX <= 640) && (absY <= 480))
 269                                         {
 270                                                 if (trap->currentAction == TRAP_FIRSTACTION)
 271                                                 {
 272                                                         if (trap->active)
 273                                                         {
 274                                                                 engine.world.place((int)trap->x + (trap->startX * 8), (int)trap->y + (trap->startY * 8));
 275                                                                 engine.world.currentWeapon = &weapon[WP_FLAMETHROWER];
 276
 277                                                                 if (trap->startX == -1)
 278                                                                 {
 279                                                                         addBullet(&engine.world, Math::rrand(-500, -100) / 100.00, Math::rrand(-20, 20) / 100.00);
 280                                                                 }
 281                                                                 else if (trap->startX == 1)
 282                                                                 {
 283                                                                         addBullet(&engine.world, Math::rrand(100, 500) / 100.00, Math::rrand(-2, 20) / 100.00);
 284                                                                 }
 285                                                                 else if (trap->startY == -1)
 286                                                                 {
 287                                                                         addBullet(&engine.world, Math::rrand(-20, 20) / 100.00, Math::rrand(-500, -100) / 100.00);
 288                                                                 }
 289                                                                 else if (trap->startY == 1)
 290                                                                 {
 291                                                                         addBullet(&engine.world, Math::rrand(-20, 20) / 100.00, Math::rrand(100, 500) / 100.00);
 292                                                                 }
 293                                                         }
 294                                                 }
 295                                         }
 296                                         break;
 297
 298                                 case TRAP_TYPE_BARRIER:
 299                                         if (trap->currentAction == TRAP_FIRSTACTION)
 300                                         {
 301                                                 if (trap->active)
 302                                                 {
 303                                                         graphics.blit(trap->sprite->getCurrentFrame(), x, y, graphics.screen, false);
 304                                                         doTrapCollisions(trap);
 305                                                 }
 306                                         }
 307                                         break;
 308
 309                                 default:
 310                                         graphics.blit(trap->sprite->getCurrentFrame(), x, y, graphics.screen, false);
 311                                 if (trap->active)
 312                                         {
 313                                                 remove = doTrapCollisions(trap);
 314                                         }
 315                                         break;
 316                         }
 317                 }
 318
 319
 320                 if (trap->type != TRAP_TYPE_MINE)
 321                         remove = false;
 322
 323                 if (!remove)
 324                 {
 325                         previous = trap;
 326                 }
 327                 else
 328                 {
 329                         map.trapList.remove(previous, trap);
 330                         trap = previous;
 331                 }
 332         }
 333 }