SphereParticleEmitter.cpp

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#include <tdme/engine/subsystems/particlesystem/SphereParticleEmitter.h>
 
#include <tdme/tdme.h>
#include <tdme/engine/model/Color4.h>
#include <tdme/engine/model/Color4Base.h>
#include <tdme/engine/primitives/BoundingVolume.h>
#include <tdme/engine/primitives/Sphere.h>
#include <tdme/engine/subsystems/particlesystem/Particle.h>
#include <tdme/engine/Transformations.h>
#include <tdme/math/Math.h>
#include <tdme/math/Vector3.h>
 
using tdme::engine::model::Color4;
using tdme::engine::model::Color4Base;
using tdme::engine::primitives::BoundingVolume;
using tdme::engine::primitives::Sphere;
using tdme::engine::subsystems::particlesystem::Particle;
using tdme::engine::subsystems::particlesystem::SphereParticleEmitter;
using tdme::engine::Transformations;
using tdme::math::Math;
using tdme::math::Vector3;
 
SphereParticleEmitter::SphereParticleEmitter(int32_t count, int64_t lifeTime, int64_t lifeTimeRnd, float mass, float massRnd, Sphere* sphere, const Vector3& velocity, const Vector3& velocityRnd, const Color4& colorStart, const Color4& colorEnd)
{
    this->count = count;
    this->lifeTime = lifeTime;
    this->lifeTimeRnd = lifeTimeRnd;
    this->mass = mass;
    this->massRnd = massRnd;
    this->sphere = sphere;
    this->sphereTransformed = static_cast< Sphere* >(sphere->clone());
    this->velocity.set(velocity);
    this->velocityRnd.set(velocityRnd);
    this->colorStart.set(colorStart);
    this->colorEnd.set(colorEnd);
}
 
SphereParticleEmitter::~SphereParticleEmitter() {
    delete sphere;
    delete sphereTransformed;
}
 
void SphereParticleEmitter::emit(Particle* particle)
{
    // set up particle
    particle->active = true;
    particle->spriteIndex = 0.0f;
    particle->position.set(
        Math::random() * 2.0f - 1.0f,
        Math::random() * 2.0f - 1.0f,
        Math::random() * 2.0f - 1.0f
    ).normalize().scale(sphereTransformed->getRadius());
    particle->velocity.set(
        velocity[0] + (Math::random() * velocityRnd[0] * (Math::random() > 0.5 ? +1.0f : -1.0f)),
        velocity[1] + (Math::random() * velocityRnd[1] * (Math::random() > 0.5 ? +1.0f : -1.0f)),
        velocity[2] + (Math::random() * velocityRnd[2] * (Math::random() > 0.5 ? +1.0f : -1.0f))
    );
    particle->mass = mass + (Math::random() * (massRnd));
    particle->lifeTimeMax = lifeTime + static_cast< int64_t >((Math::random() * lifeTimeRnd));
    particle->lifeTimeCurrent = 0LL;
    particle->color.set(colorStart);
    particle->colorAdd.set(
        (colorEnd.getRed() - colorStart.getRed()) / particle->lifeTimeMax,
        (colorEnd.getGreen() - colorStart.getGreen()) / particle->lifeTimeMax,
        (colorEnd.getBlue() - colorStart.getBlue()) / particle->lifeTimeMax,
        (colorEnd.getAlpha() - colorStart.getAlpha()) / particle->lifeTimeMax
    );
}
 
void SphereParticleEmitter::fromTransformations(const Transformations& transformations)
{
    auto& transformationsMatrix = transformations.getTransformationsMatrix();
    // apply translations
    Vector3 center;
    Vector3 axis;
    //  translate center
    center = transformationsMatrix.multiply(sphere->getCenter());
    // scale and radius transformed
    Vector3 scale;
    transformationsMatrix.getScale(scale);
    *sphereTransformed = Sphere(center, sphere->getRadius() * Math::max(scale.getX(), Math::max(scale.getY(), scale.getZ())));
}