src/CEntity.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 "headers.h"
  23
  24 Entity::Entity()
  25 {
  26         name[0] = 0;
  27         x = y = dx = dy = tx = ty = width = height = 0;
  28         id = 0;
  29         health = 0;
  30         immune = 120;
  31         environment = ENV_AIR;
  32         value = 0;
  33         oxygen = 7;
  34         falling = false;
  35         fuel = 7;
  36         thinktime = baseThink = 0;
  37         next = NULL;
  38         owner = this;
  39         face = 0;
  40         reload = 0;
  41         deathSound = -1;
  42         flags = 0;
  43         falling = false;
  44         owner = this;
  45         dead = DEAD_ALIVE;
  46         referenced = false;
  47
  48         for (int i = 0 ; i < 3 ; i++)
  49         {
  50                 sprite[i] = NULL;
  51         }
  52 }
  53
  54 void Entity::setName(const char *name)
  55 {
  56         strlcpy(this->name, name, sizeof this->name);
  57 }
  58
  59 void Entity::setSprites(Sprite *sprite1, Sprite *sprite2, Sprite *sprite3)
  60 {
  61         sprite[0] = sprite1;
  62         sprite[1] = sprite2;
  63         sprite[2] = sprite3;
  64
  65         currentFrame = 0;
  66
  67         if (sprite[0]->maxFrames > 0)
  68         {
  69                 currentFrame = Math::prand() % (sprite[0]->maxFrames + 1);
  70         }
  71
  72         width = sprite[0]->image[0]->w;
  73         height = sprite[0]->image[0]->h;
  74
  75         currentTime = 1;
  76 }
  77
  78 void Entity::animate()
  79 {
  80         currentTime--;
  81
  82         if (currentTime == 0)
  83         {
  84                 currentFrame++;
  85                 sprite[face]->getNextFrame(&currentFrame, &currentTime);
  86         }
  87 }
  88
  89 SDL_Surface *Entity::getFaceImage()
  90 {
  91         if ((health > 0) && (immune <= 120))
  92         {
  93                 return sprite[face]->image[currentFrame];
  94         }
  95
  96         return sprite[2]->getCurrentFrame();
  97 }
  98
  99 void Entity::place(int x, int y)
 100 {
 101         this->x = this->tx = x;
 102         this->y = this->ty = y;
 103 }
 104
 105 void Entity::setVelocity(float dx, float dy)
 106 {
 107         this->dx = dx;
 108         this->dy = dy;
 109 }
 110
 111 void Entity::move()
 112 {
 113         x += dx;
 114         y += dy;
 115 }
 116
 117 void Entity::setRandomVelocity()
 118 {
 119         dx = Math::rrand(-100, 100);
 120         dx /= 50;
 121
 122         dy = Math::rrand(-15, 0);
 123 }
 124
 125 void Entity::applyGravity()
 126 {
 127         if ((environment == ENV_AIR) && (!(flags & ENT_WEIGHTLESS)))
 128                 dy += 0.5;
 129         else
 130                 dy = 1;
 131
 132         Math::limitFloat(&dy, -12, 12);
 133 }
 134
 135 void Entity::checkEnvironment()
 136 {
 137         switch (environment)
 138         {
 139                 case ENV_AIR:
 140                         Math::limitChar(&(oxygen += 2), 0, 7);
 141                         break;
 142                 case ENV_WATER:
 143                         if (!(flags & ENT_SWIMS))
 144                         {
 145                                 Math::limitChar(&(oxygen -= 1), 0, 7);
 146                                 if (oxygen == 0)
 147                                 {
 148                                         health--;
 149                                         thinktime = 30;
 150                                 }
 151                         }
 152                         break;
 153                 case ENV_SLIME:
 154                         if (immune == 0)
 155                                 health--;
 156                         break;
 157                 case ENV_LAVA:
 158                         if (immune == 0)
 159                                 health -= 2;
 160                         break;
 161         }
 162 }
 163
 164 void Entity::think()
 165 {
 166         if (immune > 0)
 167         {
 168                 immune--;
 169
 170                 if ((falling) && (immune == 121) && (environment == ENV_AIR))
 171                 {
 172                         immune = 122;
 173                 }
 174         }
 175
 176         Math::wrapInt(&(--thinktime), 0, baseThink);
 177         Math::limitInt(&(--reload), 0, 255);
 178
 179         if (flags & ENT_DYING)
 180         {
 181                 health--;
 182         }
 183
 184         if (flags & ENT_FLIES)
 185         {
 186                 if (thinktime == 0)
 187                 {
 188                         fuel--;
 189                         if (fuel == 0)
 190                         {
 191                                 Math::removeBit(&flags, ENT_FLIES);
 192                         }
 193                 }
 194         }
 195         else
 196         {
 197                 if (thinktime == 0)
 198                 {
 199                         fuel++;
 200                 }
 201         }
 202
 203         Math::limitChar(&fuel, 0, 7);
 204
 205         if ((thinktime == 0) && (!(flags & ENT_INANIMATE)))
 206         {
 207                 checkEnvironment();
 208         }
 209 }