src/bullets.cpp

   1 /*
   2 Copyright (C) 2004 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 "bullets.h"
  22
  23 void addBullet(Entity *owner, float dx, float dy)
  24 {
  25         if (!(owner->flags & ENT_BOSS))
  26         {
  27                 if (owner->environment == ENV_WATER)
  28                 {
  29                         if ((owner->currentWeapon != &weapon[WP_PISTOL]) && (owner->currentWeapon != &weapon[WP_AIMEDPISTOL]))
  30                         {
  31                                 return;
  32                         }
  33                 }
  34         }
  35
  36         Entity *bullet = new Entity();
  37
  38         bullet->x = owner->x;
  39         bullet->y = owner->y;// + owner->dy;
  40
  41         if (owner != &engine.world)
  42         {
  43                 bullet->x += (owner->width / 2);
  44                 bullet->y += (owner->height / 2);
  45         }
  46
  47         bullet->setName(owner->currentWeapon->name);
  48         bullet->id = owner->currentWeapon->id;
  49         bullet->dx = dx;
  50         bullet->dy = owner->currentWeapon->dy + dy;
  51         bullet->next = NULL;
  52         bullet->health = owner->currentWeapon->health;
  53         bullet->damage = owner->currentWeapon->damage;
  54         bullet->setSprites(owner->currentWeapon->sprite[0], owner->currentWeapon->sprite[1], owner->currentWeapon->sprite[1]);
  55         bullet->face = owner->face;
  56         bullet->owner = owner;
  57         bullet->flags = owner->currentWeapon->flags + ENT_SPARKS + ENT_BULLET + ((owner->flags & ENT_BOSS) ? ENT_BOSS : 0);
  58
  59         if (bullet->flags & ENT_EXPLODES)
  60         {
  61                 bullet->deathSound = SND_GRENADE;
  62         }
  63         else if (owner->currentWeapon->fireSound > -1)
  64         {
  65                 if ((Math::prand() % 2) == 0)
  66                 {
  67                         bullet->deathSound = SND_RICO1;
  68                 }
  69                 else
  70                 {
  71                         bullet->deathSound = SND_RICO2;
  72                 }
  73         }
  74
  75         // cheating here!
  76         if (owner->currentWeapon->id == WP_STALAGTITE)
  77         {
  78                 bullet->deathSound = SND_STONEBREAK;
  79         }
  80
  81         if (owner->currentWeapon->fireSound > -1)
  82         {
  83                 audio.playSound(owner->currentWeapon->fireSound, CH_WEAPON);
  84         }
  85
  86         if (owner->flags & ENT_AIMS)
  87         {
  88                 Math::calculateSlope(player.x + Math::rrand(-20, 20), player.y + Math::rrand(-20, 20), bullet->x, bullet->y, &bullet->dx, &bullet->dy);
  89                 bullet->dx *= owner->currentWeapon->dx;
  90                 bullet->dy *= owner->currentWeapon->dy;
  91         }
  92
  93         map.addBullet(bullet);
  94
  95         // Adjust the reload time of enemies according to difficulty level
  96         owner->reload = owner->currentWeapon->reload;
  97
  98         if ((owner != &player) && (game.skill < 3))
  99         {
 100                 owner->reload *= (3 - game.skill);
 101         }
 102
 103         if (owner->flags & ENT_ALWAYSFIRES)
 104         {
 105                 owner->reload = 10;
 106         }
 107
 108         if (owner == &player)
 109         {
 110                 game.incBulletsFired();
 111
 112                 if (engine.cheatReload)
 113                 {
 114                         owner->reload = 4;
 115                 }
 116         }
 117 }
 118
 119 void destroyBullet(Entity *bullet)
 120 {
 121         if (bullet->deathSound == -1)
 122         {
 123                 return;
 124         }
 125
 126         bullet->health = 0;
 127
 128         if (bullet->flags & ENT_SPARKS)
 129         {
 130                 audio.playSound(bullet->deathSound, CH_TOUCH);
 131         }
 132
 133         if (bullet->flags & ENT_EXPLODES)
 134         {
 135                 addExplosion(bullet->x + (bullet->width / 2), bullet->y + (bullet->height / 2), bullet->damage, bullet->owner);
 136         }
 137
 138         if (bullet->id == WP_STALAGTITE)
 139         {
 140                 throwStalagParticles(bullet->x, bullet->y);
 141         }
 142
 143         float dx, dy;
 144
 145         for (int i = 0 ; i < 3 ; i++)
 146         {
 147                 dx = Math::rrand(-30, 30); dx /= 12;
 148                 dy = Math::rrand(-30, 30); dy /= 12;
 149
 150                 if (bullet->flags & ENT_SPARKS)
 151                 {
 152                         map.addParticle(bullet->x, bullet->y, dx, dy, Math::rrand(5, 30), graphics.white, NULL, 0);
 153                 }
 154                 else
 155                 {
 156                         map.addParticle(bullet->x, bullet->y, dx, dy, Math::rrand(5, 30), graphics.red, NULL, 0);
 157                 }
 158         }
 159 }
 160
 161 // Just a little convinence function!
 162 void removeBullet(Entity *bullet)
 163 {
 164         bullet->health = 0;
 165         bullet->deathSound = -1;
 166         Math::removeBit(&bullet->flags, ENT_SPARKS);
 167         Math::removeBit(&bullet->flags, ENT_PUFFS);
 168         Math::removeBit(&bullet->flags, ENT_EXPLODES);
 169 }
 170
 171 void bounceBullet(Entity *bullet, float dx, float dy)
 172 {
 173         if (dx)
 174         {
 175                 bullet->dx = -bullet->dx;
 176                 bullet->x += bullet->dx;
 177                 if (bullet->id != WP_LASER)
 178                 {
 179                         bullet->dx *= 0.75;
 180                         audio.playSound(SND_GRBOUNCE, CH_TOUCH);
 181                 }
 182                 bullet->face = !bullet->face;
 183         }
 184
 185         if (dy)
 186         {
 187                 bullet->dy = -bullet->dy;
 188                 bullet->y += bullet->dy;
 189
 190                 Math::limitFloat(&bullet->dy, -4, 4);
 191
 192                 if ((bullet->dy > -2) && (bullet->dy <= 0)) bullet->dy = -2;
 193                 if ((bullet->dy > 0) && (bullet->dy < 2)) bullet->dy = 2;
 194
 195                 if (bullet->id != WP_LASER)
 196                 {
 197                         bullet->dy *= 0.75;
 198                         audio.playSound(SND_GRBOUNCE, CH_TOUCH);
 199                 }
 200
 201                 if ((bullet->dy > -2) && (bullet->dy <= 0)) bullet->dy = -2;
 202                 if ((bullet->dy > 0) && (bullet->dy < 2)) bullet->dy = 2;
 203
 204                 bullet->face = !bullet->face;
 205         }
 206 }
 207
 208 bool bulletHasCollided(Entity *bullet, float dx, float dy)
 209 {
 210         bullet->x += dx;
 211         bullet->y += dy;
 212
 213         int x = (int)bullet->x >> BRICKSHIFT;
 214         int y = (int)bullet->y >> BRICKSHIFT;
 215
 216         if ((x < 0) || (y < 0))
 217         {
 218                 removeBullet(bullet);
 219         }
 220         else
 221         {
 222                 if (map.isSolid(x, y))
 223                 {
 224                         if (map.isBreakable(x, y))
 225                         {
 226                                 if (bullet->flags & ENT_EXPLODES)
 227                                 {
 228                                         Math::removeBit(&bullet->flags, ENT_BOUNCES);
 229                                         map.data[x][y] = MAP_AIR;
 230                                         audio.playSound(SND_STONEBREAK, CH_EXPLODE);
 231                                         throwBrickParticles(x << BRICKSHIFT, y << BRICKSHIFT);
 232                                 }
 233                                 else
 234                                 {
 235                                         if ((Math::prand() % 2) == 0)
 236                                         {
 237                                                 map.data[x][y] = MAP_AIR;
 238                                                 audio.playSound(SND_STONEBREAK, CH_EXPLODE);
 239                                                 throwBrickParticles(x << BRICKSHIFT, y << BRICKSHIFT);
 240                                         }
 241                                 }
 242                         }
 243
 244                         if (bullet->flags & ENT_BOUNCES)
 245                         {
 246                                 bounceBullet(bullet, dx, dy);
 247                         }
 248
 249                         return true;
 250                 }
 251         }
 252
 253         enemyBulletCollisions(bullet);
 254
 255         checkPlayerBulletCollisions(bullet);
 256
 257         checkBossBulletCollisions(bullet);
 258
 259         checkSwitchContact(bullet);
 260
 261         if ((checkTrainContact(bullet, 0)) || (checkObstacleContact(bullet, 0)))
 262         {
 263                 if (bullet->flags & ENT_BOUNCES)
 264                         bounceBullet(bullet, dx, dy);
 265                 return true;
 266         }
 267
 268         return false;
 269 }
 270
 271 void doBullets()
 272 {
 273         Entity *bullet = (Entity*)map.bulletList.getHead();
 274         Entity *previous = bullet;
 275
 276         int x, y;
 277
 278         while (bullet->next != NULL)
 279         {
 280                 bullet = (Entity*)bullet->next;
 281
 282                 bullet->owner->referenced = true;
 283
 284                 x = (int)(bullet->x - engine.playerPosX);
 285                 y = (int)(bullet->y - engine.playerPosY);
 286
 287                 graphics.blit(bullet->getFaceImage(), x, y, graphics.screen, true);
 288                 bullet->animate();
 289
 290                 if (bullet->flags & ENT_ONFIRE)
 291                 {
 292                         addFireParticles(bullet->x + Math::rrand(-8, 8), bullet->y + Math::rrand(-8, 8), 1);
 293                 }
 294
 295                 if (bullet->flags & ENT_FIRETRAIL)
 296                 {
 297                         addFireTrailParticle(bullet->x, bullet->y);
 298                 }
 299
 300                 if (bullet->flags & ENT_PARTICLETRAIL)
 301                 {
 302                         addColorParticles(x, y, -1, 3);
 303                 }
 304
 305                 if (bullet->owner == &player)
 306                 {
 307                         if ((x < -160) || (y < -120) || (x > 800) || (y > 600))
 308                         {
 309                                 removeBullet(bullet);
 310                         }
 311                 }
 312
 313                 if (bulletHasCollided(bullet, bullet->dx, 0))
 314                 {
 315                         if (!(bullet->flags & ENT_BOUNCES))
 316                         {
 317                                 bullet->health = 0;
 318                         }
 319                 }
 320
 321                 if (bulletHasCollided(bullet, 0, bullet->dy))
 322                 {
 323                         if (!(bullet->flags & ENT_BOUNCES))
 324                         {
 325                                 bullet->health = 0;
 326                         }
 327                 }
 328
 329                 bullet->health--;
 330
 331                 if (bullet->health == 0)
 332                 {
 333                         Math::removeBit(&bullet->flags, ENT_SPARKS);
 334                         Math::removeBit(&bullet->flags, ENT_PUFFS);
 335                 }
 336
 337                 if (!(bullet->flags & ENT_WEIGHTLESS))
 338                 {
 339                         bullet->dy += 0.1;
 340                 }
 341
 342                 if (bullet->health > 0)
 343                 {
 344                         previous = bullet;
 345                 }
 346                 else
 347                 {
 348                         destroyBullet(bullet);
 349                         map.bulletList.remove(previous, bullet);
 350                         bullet = previous;
 351                 }
 352         }
 353 }
 354