src/traps.cpp

   1 /*
   2 Copyright (C) 2004-2011 Parallel Realities
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20
  21 #include "traps.h"
  22
  23 /**
  24 * Adds a trap to the map
  25 * @param name The name of the trap group
  26 * @param trapType The type of trap this is
  27 * @param damage The damage the trap does
  28 * @param speed The speed at which the trap moves
  29 * @param startY The starting X location of the trap
  30 * @param startY The starting Y location of the trap
  31 * @param startY The ending X location of the trap
  32 * @param startY The ending Y location of the trap
  33 * @param wait1 The first state wait time
  34 * @param wait2 The second state wait time
  35 * @param sprite The Sprite to use with this trap
  36 * @param active The active state of this trap
  37 */
  38 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)
  39 {
  40         Trap *trap = new Trap();
  41
  42         trap->setName(name);
  43         trap->setTrapType(trapType);
  44         trap->setDamage(damage);
  45         trap->setSpeed(speed);
  46         trap->setDestinations(startX, startY, endX, endY);
  47
  48         if (wait1 == -1) wait1 = Math::rrand(10, 60);
  49         if (wait2 == -1) wait2 = Math::rrand(10, 60);
  50
  51         trap->setWaitTimes(wait1, wait2);
  52         trap->setSprite(graphics.getSprite(sprite, true));
  53         trap->active = active;
  54
  55         if (trap->type == TRAP_TYPE_BARRIER)
  56         {
  57                 trap->currentAction = TRAP_FIRSTACTION;
  58                 trap->thinktime = wait1;
  59                 if (trap->thinktime == 0)
  60                         trap->thinktime = 1;
  61         }
  62
  63         map.addTrap(trap);
  64 }
  65
  66 /**
  67 * Toggles the active state of a trap
  68 * @param The trap to toggle
  69 */
  70 void toggleTrap(Trap *trap)
  71 {
  72         trap->active = !trap->active;
  73
  74         if (trap->type == TRAP_TYPE_MINE)
  75         {
  76                 if (trap->active)
  77                 {
  78                         trap->setSprite(graphics.getSprite("ActiveMine", true));
  79                 }
  80                 else
  81                 {
  82                         trap->setSprite(graphics.getSprite("InActiveMine", true));
  83                 }
  84         }
  85 }
  86
  87 /**
  88 * Draws the chain link for the spiked ball traps.
  89 * @param trap The trap that the chain link should be drawn from
  90 */
  91 void drawTrapChain(Trap *trap)
  92 {
  93         float x = trap->startX;
  94         float y = trap->startY;
  95         int tx = (int)trap->x + (trap->sprite->image[0]->w / 2);
  96         int ty = (int)trap->y + (trap->sprite->image[0]->h / 2);
  97         float dx, dy;
  98
  99         Math::calculateSlope(tx, ty, trap->startX, trap->startY, &dx, &dy);
 100
 101         dx *= 7;
 102         dy *= 7;
 103
 104         SDL_Surface *chainLink = graphics.getSprite("ChainLink", true)->getCurrentFrame();
 105
 106         if ((dx == 0) && (dy == 0))
 107                 return;
 108
 109         while (true)
 110         {
 111                 graphics.blit(chainLink, (int)(x - engine.playerPosX), (int)(y - engine.playerPosY), graphics.screen, true);
 112
 113                 x += dx;
 114                 y += dy;
 115
 116                 if (Collision::collision(x, y, 3, 3, tx, ty, 4, 4))
 117                         break;
 118         }
 119 }
 120
 121 /**
 122 * Checks for a trap colliding with enemies or the Player
 123 * @param trap The trap to perform the check
 124 * @return Whether the trap made contact with an enemy or the Player
 125 */
 126 bool doTrapCollisions(Trap *trap)
 127 {
 128         bool hit = false;
 129
 130         if ((trap->type == TRAP_TYPE_SPIKE) && (trap->currentAction != TRAP_FIRSTACTION))
 131         {
 132                 return false;
 133         }
 134
 135         Entity *enemy = (Entity*)map.enemyList.getHead();
 136
 137         while (enemy->next != NULL)
 138         {
 139                 enemy = (Entity*)enemy->next;
 140
 141                 if (Collision::collision(trap->x, trap->y, trap->width, trap->height, enemy->x, enemy->y, enemy->width, enemy->height))
 142                 {
 143                         throwAndDamageEntity(enemy, trap->damage, -5, 5, -8);
 144                         hit = true;
 145                 }
 146         }
 147
 148         if ((player.immune > 0) && (player.immune <= 120))
 149         {
 150                 return hit;
 151         }
 152
 153         if (Collision::collision(trap->x, trap->y, trap->width, trap->height, player.x, player.y, player.width, player.height))
 154         {
 155                 throwAndDamageEntity(&player, trap->damage, -5, 5, -8);
 156
 157                 if (trap->damage == 10)
 158                 {
 159                         player.health = 0;
 160                 }
 161
 162                 if (trap->type == TRAP_TYPE_MINE)
 163                 {
 164                         for (int i = 0 ; i < 10 ; i++)
 165                         {
 166                                 addExplosion(trap->x + Math::rrand(-15, 15), trap->y + Math::rrand(-15, 15), 50, &engine.world);
 167                         }
 168                 }
 169                 hit = true;
 170         }
 171
 172         return hit;
 173 }
 174
 175 /**
 176 * Loops through all the traps and makes them do their thing according
 177 * to the type of trap that they are
 178 */
 179 void doTraps()
 180 {
 181         Trap *trap = (Trap*)map.trapList.getHead();
 182         Trap *previous = trap;
 183
 184         bool remove = false;
 185         int x, y, mx, my;
 186         unsigned int absX, absY;
 187
 188         while (trap->next != NULL)
 189         {
 190                 trap = (Trap*)trap->next;
 191
 192                 x = (int)(trap->x - engine.playerPosX);
 193                 y = (int)(trap->y - engine.playerPosY);
 194
 195                 if (trap->type == TRAP_TYPE_SWING)
 196                 {
 197                         absX = abs(x - trap->endX);
 198                         absY = abs(y - trap->endY);
 199                 }
 200                 else
 201                 {
 202                         absX = abs(x);
 203                         absY = abs(y);
 204                 }
 205
 206                 /*
 207                         Barrier traps must be do at all times. Otherwise there is an "break" in the
 208                         line if more than one barrier is used over a large space and the barrier becomes
 209                         inconsistant.
 210                 */
 211
 212                 if (((absX < 800) && (absY < 600)) || (trap->type == TRAP_TYPE_BARRIER) || (trap->type == TRAP_TYPE_FLAME))
 213                 {
 214                         remove = false;
 215
 216                         if ((trap->think()) && (trap->active))
 217                         {
 218                                 switch (trap->type)
 219                                 {
 220                                         case TRAP_TYPE_MINE:
 221                                                 audio.playSound(SND_ROCKET, CH_SPAWN);
 222                                                 break;
 223                                         case TRAP_TYPE_SPIKE:
 224                                                 audio.playSound(SND_ROCKET, CH_SPAWN);
 225                                                 break;
 226                                         case TRAP_TYPE_SWING:
 227                                                 audio.playSound(SND_THROW, CH_SPAWN);
 228                                                 break;
 229                                         case TRAP_TYPE_BARRIER:
 230                                                 if ((absX <= 640) && (absY <= 480))
 231                                                 {
 232                                                         audio.playSound(SND_ELECTRICITY1 + Math::prand() % 3, CH_SPAWN);
 233                                                 }
 234                                                 break;
 235                                         case TRAP_TYPE_FLAME:
 236                                                 if ((absX <= 640) && (absY <= 480))
 237                                                 {
 238                                                         audio.playSound(SND_FIRECRACKLE, CH_SPAWN);
 239                                                 }
 240                                                 break;
 241                                 }
 242                         }
 243
 244                         if (trap->type == TRAP_TYPE_MINE)
 245                         {
 246                                 mx = (int)trap->x >> BRICKSHIFT;
 247                                 my = (int)(trap->y + trap->dy + trap->sprite->image[0]->h) >> BRICKSHIFT;
 248
 249                                 if (map.isSolid(mx, my))
 250                                 {
 251                                         trap->y = (my * BRICKSIZE) - trap->sprite->image[0]->h;
 252                                         trap->dy = 0;
 253                                 }
 254                         }
 255
 256                         if (trap->type == TRAP_TYPE_SWING)
 257                         {
 258                                 drawTrapChain(trap);
 259                         }
 260
 261                         switch (trap->type)
 262                         {
 263                                 case TRAP_TYPE_FLAME:
 264
 265                                         graphics.blit(trap->sprite->getCurrentFrame(), x, y, graphics.screen, true);
 266
 267                                         if ((absX <= 640) && (absY <= 480))
 268                                         {
 269                                                 if (trap->currentAction == TRAP_FIRSTACTION)
 270                                                 {
 271                                                         if (trap->active)
 272                                                         {
 273                                                                 engine.world.place((int)trap->x + (trap->startX * 8), (int)trap->y + (trap->startY * 8));
 274                                                                 engine.world.currentWeapon = &weapon[WP_FLAMETHROWER];
 275
 276                                                                 if (trap->startX == -1)
 277                                                                 {
 278                                                                         addBullet(&engine.world, Math::rrand(-500, -100) / 100.00, Math::rrand(-20, 20) / 100.00);
 279                                                                 }
 280                                                                 else if (trap->startX == 1)
 281                                                                 {
 282                                                                         addBullet(&engine.world, Math::rrand(100, 500) / 100.00, Math::rrand(-2, 20) / 100.00);
 283                                                                 }
 284                                                                 else if (trap->startY == -1)
 285                                                                 {
 286                                                                         addBullet(&engine.world, Math::rrand(-20, 20) / 100.00, Math::rrand(-500, -100) / 100.00);
 287                                                                 }
 288                                                                 else if (trap->startY == 1)
 289                                                                 {
 290                                                                         addBullet(&engine.world, Math::rrand(-20, 20) / 100.00, Math::rrand(100, 500) / 100.00);
 291                                                                 }
 292                                                         }
 293                                                 }
 294                                         }
 295                                         break;
 296
 297                                 case TRAP_TYPE_BARRIER:
 298                                         if (trap->currentAction == TRAP_FIRSTACTION)
 299                                         {
 300                                                 if (trap->active)
 301                                                 {
 302                                                         graphics.blit(trap->sprite->getCurrentFrame(), x, y, graphics.screen, false);
 303                                                         doTrapCollisions(trap);
 304                                                 }
 305                                         }
 306                                         break;
 307
 308                                 default:
 309                                         graphics.blit(trap->sprite->getCurrentFrame(), x, y, graphics.screen, false);
 310                                 if (trap->active)
 311                                         {
 312                                                 remove = doTrapCollisions(trap);
 313                                         }
 314                                         break;
 315                         }
 316                 }
 317
 318
 319                 if (trap->type != TRAP_TYPE_MINE)
 320                         remove = false;
 321
 322                 if (!remove)
 323                 {
 324                         previous = trap;
 325                 }
 326                 else
 327                 {
 328                         map.trapList.remove(previous, trap);
 329                         trap = previous;
 330                 }
 331         }
 332 }