particle.cpp


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#include "particle.h"

#include <cmath>

float SelectionParticle::t = 0;

SelectionParticle::SelectionParticle() {
	init(t += .1);
}

SelectionParticle::SelectionParticle(const SelectionParticle& p) {
	pos = p.pos;
	vel = p.vel;
	alpha = p.alpha;
	decay = p.decay;
}

void SelectionParticle::init(float seed) {
	pt = seed;
	speed = .0005 + fmodf(seed, .001);
	speed = .001 + fmodf(seed, .002);
	alpha = 1.0;
	decay = 0.001 * ((rand() % 5 + 5) / 20.0);
	pos = Vector3(cosf(rand()), 0, sinf(rand()));
	//pos = Vector3(cosf(seed), 0, sinf(seed));
	//p.pos = src;
	//p.pos.x *= ((rand() % 20 + 10) / 
	vel = Vector3(cosf(rand()), 10, sinf(rand()));
	vel /= vel.length();// * ((rand() % 10 + 5) / 10);
}

void SelectionParticle::update(unsigned int steps, vec4f *v) {
	pt += speed * steps;
	alpha -= decay * steps;
	if(alpha <= 0) {
		init(t += 0.1);
		return;
	} else {
		pos += vel * (steps / 1000.0);
		pos.y += vel.y * (steps / 1000.0);
		//it->vel += Vector3(0, -.1, 0) * (steps / 1000.0);
	}
	//update(steps);
	//vec4f *v = &vertices[i];
	//v->x = pos.x * cosf(t * (i+1) / 800);
	v->x = pos.x * cosf(pt);
	v->y = pos.y;
	//v->z = pos.z * sinf(t * (i+1) / 800);
	v->z = pos.z * sinf(pt);
	v->w = alpha;
}