Ejemplo n.º 1
0
void update(Particles *uemitter, Particle* part, int partNumber)
{
    Particles uemit = *uemitter;
    Uint32 timeElapsed;
    Uint32 curr = getMilliCount();
    timeElapsed = curr - uemit.m_lastRender;
    //printf("get -elapsed %d emitter last render %d\n", timeElapsed, emitter->m_lastRender);
    uemit.particles[partNumber].m_age += timeElapsed;
    if (!isAlive(&(uemit.particles[partNumber])))
    {
        printf("Dead\n");
        //printf( "age %u timedie %u\n", part->m_age, part->m_timeDie);
        // smoke eventually dies
        /*if (r01() > emitter.m_dieRate)
        {
          part->m_canRegen = FALSE;
        }
        if (!part->m_canRegen)
        {
          return;
        }*/
        // regenerate
        uemit.particles[partNumber].m_age = 1;
        startRand(&uemit, &(uemit.particles[partNumber]), partNumber);
        *uemitter = uemit;
        return;
    }
    // At start the particle fades in and expands rapidly (like in real life)
    double fadeIn = uemit.particles[partNumber].m_timeDie * 0.01;
    double startScale;
    double maxStartScale = 0.4;
    if (uemit.particles[partNumber].m_age < fadeIn)
    {
        uemit.particles[partNumber].m_alpha = ((uemit.particles[partNumber].m_age / fadeIn));
        //printf("fade calc = %f \n", (part->m_age/fadeIn)*10 );
        startScale = uemit.particles[partNumber].m_alpha * maxStartScale;
        // y increases quicker because particle is expanding quicker
        uemit.particles[partNumber].m_y += uemit.particles[partNumber].m_yVector * timeElapsed;

    }
    else
    {
        uemit.particles[partNumber].m_alpha = 1.0 - (uemit.particles[partNumber].m_age - fadeIn) / (uemit.particles[partNumber].m_timeDie - fadeIn);
        startScale = maxStartScale;
        uemit.particles[partNumber].m_y += uemit.particles[partNumber].m_yVector * timeElapsed;
    }
    // the x direction is influenced by wind velocity
    uemit.particles[partNumber].m_x += (uemit.particles[partNumber].m_xVector + uemit.m_windVelocity) * timeElapsed;
    uemit.particles[partNumber].m_scale = 0.001 + startScale + uemit.particles[partNumber].m_age / 4000.0;
    //printf( "x = %f y =%f\n", uemit.particles[partNumber].m_x, uemit.particles[partNumber].m_y);
    /*printf("update m_speed: %f\n", emitter->m_speed);*/
    *uemitter = uemit;
}
Ejemplo n.º 2
0
void initParticles(Particles *em, int x, int y) {
    em->m_speed = 0.02;
    em->m_alpha = 1.0;
    em->m_windVelocity = 0.025;
    em->m_dieRate = 0.95;
    em->m_x = x;
    em->m_y = y;
    em->m_lastRender = getMilliCount();
    for (int i = 0; i < PART_COUNT; i++)
    {
        em->particles[i].m_x = 0;
        em->particles[i].m_canRegen = 1;
        em->particles[i].m_age = i * 50000 * em->m_speed;

        //Particle *cparticle = &emitter->particles[i];
        startRand(&*em, &((*em).particles[i]), i);
        //printf( "part = %d x = %f y =%f age = %u die = %u\n",i, em.particles[i].m_x, em.particles[i].m_y, em.particles[i].m_age, em.particles[i].m_timeDie);

    }
}
Ejemplo n.º 3
0
char* createTag()
{
	int i;
	char *tag = malloc(sizeof(char)*GENERATOR_TAG_SIZE);

	if (tag != NULL)
	{
		startRand();
		for( i=0; i<GENERATOR_TAG_LENGTH; i++)
		{
			tag[i] = nextRand(2)==0?'0':'1';
		}
		tag[GENERATOR_TAG_LENGTH] = '\0';
	}
	else
	{
		#ifdef DEBUG
		fprintf(stderr, "@Generator: Failed tag malloc\n");
		#endif
	}
	return tag;
}