//  particle.cpp
//  particleSystem
//

#include "particle.h"
#include "ofApp.h"

Particle::Particle()
{
	
}

//--------------------------------------------------------------------------------------

Particle::~Particle()
{

}

//--------------------------------------------------------------------------------------


void Particle::setup(ofVec2f _position) {

	this->position = _position;

	vel.set(ofRandom(-3.0, 3.0), ofRandom(-3.0, 3.0));

	age = 0.0;
	maxLife = 12.0;

	color.set(250, 250, 250);

	size = ofRandom(4.0, 0.01);

	mass = ofRandom(100, 250);

	tex.load("img/overlay.png");

}



//--------------------------------------------------------------------------------------

void Particle::update(float deltaT, vector<Attractor*>* attractors) {

	ofVec2f force;
	counterOfActiveAttractors = 0;
	for (int i = 0; i < attractors->size(); i++) {
		if (attractors->at(i)->getX() == 0 && attractors->at(i)->getY() == 0) {
			force = 0 * force.getNormalized();
			vel += force;
			vel = mass * vel.getNormalized();
			break;
		}

		counterOfActiveAttractors++;
		force.set(attractors->at(i)->getX() - position.x, attractors->at(i)->getY() - position.y);

		if (force.length() < 150) {
			force = 60 * force.getNormalized();
			size = size + ofRandom(.01, 0.01);

			vel += force;
			vel = mass * vel.getNormalized();
		}
		else {
			force = 0 * force.getNormalized();
			vel += force;
			vel = mass * vel.getNormalized();
		}
	}

	age += deltaT * .5;
	position += (vel * deltaT);

	//  *** COLLISION  *** COLLISION  *** COLLISION  *** COLLISION  *** COLLISION  *** COLLISION

	//if (position.x <= 0 || position.x >= ofGetWidth()) {
		//vel.x = -vel.x;
		//position += (vel * deltaT);
	//}
	//else if (position.y <= 0 || position.y >= ofGetHeight()) {
		//vel.y = -vel.y;
		//position += (vel * deltaT);
	//}
	//else {
		//position += (vel * deltaT);
	//}


	//void thParticle::update(float deltaT, ofVec2f attractor){
	//
	//
	//    age += deltaT;
	//
	//    ofVec2f force = attractor - position;
	//    color.set(250,250, 250, (1 - age / maxLife) * 255);
	//
	//    if( force.length() < 40 && force.length() > 11 ){
	//        velocity = velocity.getNormalized() * mass;
	//         velocity += 0.01 * force ;
	//
	//    }else if(force.length() < 12){
	//        velocity = velocity.getNormalized() * mass;
	//        velocity += 5 * force ;
	//
	//    }else{
	//
	//        velocity = velocity.getNormalized() * mass;
	//         velocity += 0.12 * force ;
	//    }
	//    position += velocity * deltaT;
	//}
}

//--------------------------------------------------------------------------------------

void Particle::draw() {

	color.set(getAgeNorm() * 241,241/ getAgeNorm() ,219);

	ofSetColor(color, (1 - getAgeNorm()) * 255);
	//tex.setColor(color);
	//tex.draw(position, size, size);

	ofDrawCircle(position, size);
}

//--------------------------------------------------------------------------------------


float Particle::getAgeNorm() {
	return age / maxLife;
}


//--------------------------------------------------------------------------------------


float Particle::getMaxLife() {
	return 1;
}


//--------------------------------------------------------------------------------------