Forum_Deutsches_Museum_Interaktiv/particle.cpp

//  particle.cpp
//  particleSystem
//

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

Particle::Particle()
{
	uniqueVal = ofRandom(-10000, 10000);
}

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


void Particle::setup(particleMode newMode) {
	mode = newMode;
	age = 0.0;
	//maxLife = 30.0;
	frc = ofVec2f(0, 0);
	//size = ofRandom(4.0, 0.01);
	size = .5;
	maxLife = 0.99;
	mass = ofRandom(100, 250);
	if (mode == PARTICLE_MODE_DEFAULT) {
		effect.loadFile("xml/default.xml");
		int velMin = effect.getValue("default:velMin", 0);
		int velMax = effect.getValue("default:velMax", 0);
		int lifeMax = effect.getValue("default:maxLife", 0);
		setVel(velMin, velMax);
		pos.x = ofRandomWidth();
		pos.y = ofRandomHeight();
	}
	else if (mode == PARTICLE_MODE_RADIAL) {
		effect.loadFile("xml/radial.xml");
		int velMin = effect.getValue("radial:velMin", 0);
		int velMax = effect.getValue("radial:velMax", 0);
		setVel(velMin, velMax);
		pos.x = ofGetWidth()/2;
		pos.y = ofGetHeight()/2;
	}
	else if (mode == PARTICLE_MODE_RAIN) {
		effect.loadFile("xml/rain.xml");
		vel.x = ofRandom(-40, 40);
		vel.y = ofRandom(-40, 40);
		pos.x = ofRandomWidth();
		pos.y = ofRandomHeight();
		drag = ofRandom(0.97, 0.99);
		vel.y = fabs(vel.y) * 6.0; 
	}
	else if (mode == PARTICLE_MODE_ATTRACTOR) {
		effect.loadFile("xml/rain.xml");
		vel.x = ofRandom(-40, 40);
		vel.y = ofRandom(-40, 40);
		pos.x = ofRandomWidth();
		pos.y = ofRandomHeight();
	}
	else if (mode == PARTICLE_MODE_DETRACTOR) {
		effect.loadFile("xml/rain.xml");
		vel.x = ofRandom(-40, 40);
		vel.y = ofRandom(-40, 40);
		pos.x = ofRandomWidth();
		pos.y = ofRandomHeight();
	}
	else {

		drag = ofRandom(0.95, 0.998);
	}

	tex.load("img/br.png");
}

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

void Particle::update(float deltaT, vector<Attractor*>* attractors,vector<Particle*> system) {
	if (mode == PARTICLE_MODE_DEFAULT) {
		
	}
	else if (mode == PARTICLE_MODE_RAIN) {
		float wind = ofSignedNoise(pos.x * 0.003, pos.y * 0.0006, ofGetElapsedTimef() * 0.6);

		frc.x = wind * 0.25 + ofSignedNoise(uniqueVal, pos.y * 0.08) * 0.6;
		frc.y = ofSignedNoise(uniqueVal, pos.x * 0.06, ofGetElapsedTimef()*0.2) * 0.09 + 0.18;

		vel *= drag;
		vel += frc * 0.2;

		if (pos.y + vel.y > ofGetHeight()) {
			pos.y -= ofGetHeight();
		}
		}
	else if (mode == PARTICLE_MODE_ATTRACTOR) {

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

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

			if (force.length() < 250) {
				force = 40 * force.getNormalized();
				size = size + ofRandom(.03, 0.01);
				vel += force;
				vel = mass * vel.getNormalized();
			}
			else {
				force = 0 * force.getNormalized();
				vel += force;
				vel = mass * vel.getNormalized();
			}
		}
	}
	else if (mode == PARTICLE_MODE_DETRACTOR) {
		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() - pos.x, attractors->at(i)->getY() - pos.y);

			if (force.length() < 600) {
				force.normalize();
				size = size + ofRandom(.01, 0.01);

				vel += -force*2000;
				vel = mass * vel.getNormalized();
			}
			else {
				force = 0 * force.getNormalized();
				vel += force;
				vel = mass * vel.getNormalized();
			}
		}
	}
	//Update particle pos
	age += deltaT* .5;
	pos += (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 Particle::draw() {

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

	ofSetColor(color, (1 - getAgeNorm()) * 255);
	if (mode == PARTICLE_MODE_BRUNIG) {
	tex.setColor(color);
	tex.draw(pos.x, pos.y, size);
	}
	else {
		ofDrawCircle(pos.x, pos.y, size);
	}
}

//------------------------------------------------------------------
void Particle::setMode(particleMode newMode) {
	mode = newMode;
}

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

//--------------------------------------------------------------------------------------
void Particle::setVel(float min, float max) {
	vel.x = ofRandom(min,max);
	vel.y = ofRandom(min,max);
}

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

float Particle::getY() {
	return pos.y;
}


float Particle::getX() {
	return pos.x;
}