Particle.cpp

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#include "Particle.h"
#include "ParticleSystem.h"

Vec3 p_gravity(0.0f, -9.82f, 0.0f);

Particle::Particle() {
        m_parent = NULL;
        m_age = 0.0f;
        m_size = 1.0f;
        m_color.x = 1.0f;
        m_color.y = 0.0f;
        m_color.z = 0.0f;
        m_color.w = 0.5f;
}

Particle::~Particle() {

}

bool Particle::update(float dTime) {
        if (m_age + dTime >= m_lifetime) {
                m_age = -1.0f;
                return false;
        }
        else {
                m_age += dTime;

                m_prevLocation = m_location;
                m_location += m_velocity*dTime;

                // some collision detection maby?

                m_velocity += p_gravity*m_gravity*dTime;

                if (m_parent && m_parent->isAttractive()) {
                        Vec3 attractLocation;
                        m_parent->getLocation(attractLocation);

                        Vec3 attractDir = attractLocation - m_location;

                        m_velocity += attractDir.normalize()*25.0f*dTime*0.01f;
                }

                m_color.x += m_dColor.x * dTime;
                m_color.y += m_dColor.y * dTime;
                m_color.z += m_dColor.z * dTime;

                m_alpha += m_dAlpha * dTime;

                m_size += m_dSize * dTime;

                m_gravity += m_dGravity * dTime;
        }

        return true;
}

void Particle::setParent(ParticleSystem *parent) {
        m_parent = parent;
}

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