blobwarsAttrition/src/entities/entity.c

/*
Copyright (C) 2018 Parallel Realities

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#include "entity.h"

static void applyDamage(int damage);
static float bounce(float x);
static SDL_Rect *getBounds(void);
static void tick(void);
static void touch(Entity *other);
static void animate(void);
static void load(cJSON *root);
static void save(cJSON *root);
static SDL_Rect *getCurrentSprite(void);

void initEntity(Entity *e)
{
	e->uniqueId = world.entityCounter++;
	
	e->environment = ENV_AIR;
	e->alive = ALIVE_ALIVE;

	e->isOnGround = 0;
	e->isSolid = 0;
	e->isStatic = 0;
	e->isMissionTarget = 0;

	e->health = 1;

	e->facing = FACING_LEFT;

	e->flags = 0;

	e->thinkTime = 0;
	
	e->animate = animate;
	e->tick = tick;
	e->touch = touch;
	e->applyDamage = applyDamage;
	e->bounce = bounce;
	e->getBounds = getBounds;
	e->getCurrentSprite = getCurrentSprite;
	
	e->load = load;
	e->save = save;
	
	world.entityTail->next = e;
	world.entityTail = e;
}

static SDL_Rect *getBounds(void)
{
	self->bounds.x = self->x;
	self->bounds.y = self->y;
	self->bounds.w = self->w;
	self->bounds.h = self->h;

	return &self->bounds;
}

static void animate(void)
{
	Sprite *s;
	
	if (self->spriteTime != -1)
	{
		self->spriteTime--;

		if (self->spriteTime <= 0)
		{
			s = self->sprite[self->facing];
			
			self->spriteFrame++;
			
			if (self->spriteFrame > s->numFrames)
			{
				self->spriteFrame = 0;
			}
			
			self->spriteTime = self->sprite[self->facing]->times[self->spriteFrame];
			self->w = s->w;
			self->h = s->h;
		}
	}
}

void setEntitySize(Entity *e)
{
}

static float bounce(float x)
{
	if (!(self->flags & EF_BOUNCES))
	{
		return 0;
	}
	else if (self->flags & EF_FRICTIONLESS)
	{
		return -x;
	}

	x = -x * FRICTION;

	if (x > -1 && x < 1)
	{
		self->flags &= ~EF_BOUNCES;
		x = 0;
	}

	return x;
}

void teleport(Entity *e, float tx, float ty)
{
	e->tx = tx;
	e->ty = ty;

	e->flags |= EF_TELEPORTING;

	addTeleportStars(e);
}

void activateEntities(char *names, int activate)
{
}

void teleportEntity(Entity *e, float tx, float ty)
{
}

static void applyDamage(int damage)
{
	
}

static void tick(void)
{
}

static void touch(Entity *other)
{
}

static SDL_Rect *getCurrentSprite(void)
{
	return &self->sprite[self->facing]->frames[0]->rect;
}

static void load(cJSON *root)
{
	SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_ERROR, "Entity [name=%s, type=%d, x=%d, y=%d] cannot be loaded", self->name, self->type, (int)self->x, (int)self->y);
	exit(1);
}

static void save(cJSON *root)
{
	SDL_LogMessage(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_ERROR, "Entity [name=%s, type=%d, x=%d, y=%d] cannot be saved'", self->name, self->type, (int)self->x, (int)self->y);
	exit(1);
}

void dropCarriedItem(void)
{
	EntityExt *e;
	Item *i;
	
	e = (EntityExt*)self;
	
	if (e->carriedItem != NULL)
	{
		i = e->carriedItem;
		
		i->x = (e->x + e->w / 2) - i->w / 2;
		i->y = e->y;

		i->dx = i->dy = 0;

		world.entityTail->next = (Entity*)i;
		world.entityTail = (Entity*)i;
		world.entityTail->next = NULL;

		e->carriedItem = NULL;
	}
}