/*Copyright (C) 2003 Parallel RealitiesThis program is free software; you can redistribute it and/ormodify it under the terms of the GNU General Public Licenseas published by the Free Software Foundation; either version 2of 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 ofMERCHANTABILITY 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 Licensealong with this program; if not, write to the Free SoftwareFoundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.*/#include "explosions.h"/*Create a new explosion based on supplied parameters.The "type" will actually be used as an explosion frame check.All explosion types have 4 images. The "thinktime" will be usedto change frames on a 21, 14, 7 basis.*/void addExplosion(float x, float y, int type){	object *explosion = new object;	explosion->next = NULL;	explosion->active = 1;	explosion->x = x;	explosion->y = y;	explosion->thinktime = 28;	explosion->face = type;	explosion->image[0] = graphics.shape[type];	engine.explosionTail->next = explosion;	engine.explosionTail = explosion;}/** This very simply just adds a tiny explosion at the coordinate specified.* It creates a small engine like effect.*/void addEngine(object *craft){	if (rand() % 2 == 0)		return;	float x = craft->x + (craft->engineX * craft->face);	float y = craft->y + craft->engineY;	y += Math::rrand(-3, 3);	addExplosion(x, y, E_TINY_EXPLOSION);}/*Loops through active explosions and decrements their think time.If their thinktime is divisable by 5, then the frame is changed tothe next one up (for example 0->1->2-3). When their think time is 0,the explosion is killed off.*/void doExplosions(){	object *prevExplosion = engine.explosionHead;	object *explosion = engine.explosionHead;	engine.explosionTail = engine.explosionHead;		while (explosion->next != NULL)	{		explosion = explosion->next;		if (explosion->active == 1)		{			explosion->thinktime--;									explosion->x += engine.ssx;			explosion->y += engine.ssy;				if (isOnScreen((int)explosion->x, (int)explosion->y, explosion->image[0]->w, explosion->image[0]->h))				graphics.blit(explosion->image[0], (int)explosion->x, (int)explosion->y);			if (explosion->thinktime < 1)			{				explosion->active = 0;			}			else if (explosion->thinktime % 7 == 0)			{				explosion->face++;				explosion->image[0] = graphics.shape[explosion->face];			}		}		if (explosion->active == 1)		{			prevExplosion = explosion;			engine.explosionTail = explosion;		}		else		{			prevExplosion->next = explosion->next;			delete explosion;         explosion = prevExplosion;		}	}}