axmol/extensions/Particle3D/ParticleUniverse/ParticleEmitters/CCPUParticle3DCircleEmitter.cpp

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 Copyright (c) 2015 Chukong Technologies Inc.
 
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#include "CCPUParticle3DCircleEmitter.h"
#include "extensions/Particle3D/ParticleUniverse/CCPUParticleSystem3D.h"
#include "extensions/Particle3D/ParticleUniverse/CCPUParticle3DUtil.h"
#include "base/ccRandom.h"

NS_CC_BEGIN

// Constants
const float PUParticle3DCircleEmitter::DEFAULT_RADIUS = 100.0f;
const float PUParticle3DCircleEmitter::DEFAULT_STEP = 0.1f;
const float PUParticle3DCircleEmitter::DEFAULT_ANGLE = 0.0f;
const bool PUParticle3DCircleEmitter::DEFAULT_RANDOM = true;
const Vec3 PUParticle3DCircleEmitter::DEFAULT_NORMAL(0, 0, 0);

//-----------------------------------------------------------------------
PUParticle3DCircleEmitter::PUParticle3DCircleEmitter(void) : 
    PUParticle3DEmitter(),
    _radius(DEFAULT_RADIUS),
    _circleAngle(DEFAULT_ANGLE),
    _originalCircleAngle(DEFAULT_ANGLE),
    _step(DEFAULT_STEP),
    _random(DEFAULT_RANDOM),
    _orientation(),
    _normal(DEFAULT_NORMAL),
    _x(0.0f),
    _z(0.0f)
{
}
//-----------------------------------------------------------------------
const float PUParticle3DCircleEmitter::getRadius(void) const
{
    return _radius;
}
//-----------------------------------------------------------------------
void PUParticle3DCircleEmitter::setRadius(const float radius)
{
    _radius = radius;
}
//-----------------------------------------------------------------------
const float PUParticle3DCircleEmitter::getCircleAngle(void) const
{
    return _originalCircleAngle;
}
//-----------------------------------------------------------------------
void PUParticle3DCircleEmitter::setCircleAngle(const float circleAngle)
{
    _originalCircleAngle = circleAngle;
    _circleAngle = circleAngle;
}
//-----------------------------------------------------------------------
const float PUParticle3DCircleEmitter::getStep(void) const
{
    return _step;
}
//-----------------------------------------------------------------------
void PUParticle3DCircleEmitter::setStep(const float step)
{
    _step = step;
}
//-----------------------------------------------------------------------
const bool PUParticle3DCircleEmitter::isRandom(void) const
{
    return _random;
}
//-----------------------------------------------------------------------
void PUParticle3DCircleEmitter::setRandom(const bool random)
{
    _random = random;
}
//-----------------------------------------------------------------------
const Quaternion& PUParticle3DCircleEmitter::getOrientation(void) const
{
    return _orientation;
}
//----------------------------------------------------------------------- 
const Vec3& PUParticle3DCircleEmitter::getNormal(void) const
{ 
    return _normal;
} 
//----------------------------------------------------------------------- 
void PUParticle3DCircleEmitter::setNormal(const Vec3& normal) 
{ 
    //_orientation = Vec3::UNIT_Y.getRotationTo(normal, Vec3::UNIT_X);
    _orientation = getRotationTo(Vec3::UNIT_Y, normal, Vec3::UNIT_X);
    _normal = normal;
}
//-----------------------------------------------------------------------
void PUParticle3DCircleEmitter::notifyStart (void)
{
    // Reset the attributes to allow a restart.
    _circleAngle = _originalCircleAngle;
}
//----------------------------------------------------------------------- 
void PUParticle3DCircleEmitter::initParticlePosition(PUParticle3D* particle)
{
    float angle = 0;
    if (_random)
    {
        // Choose a random position on the circle.
        angle = cocos2d::random(0.0, M_PI * 2.0);
    }
    else
    {
        // Follow the contour of the circle.
        _circleAngle += _step;
        _circleAngle = _circleAngle > M_PI * 2.0f ? _circleAngle - (M_PI * 2.0) : _circleAngle;
        angle = _circleAngle;
    }

    _x = cosf(angle);
    _z = sinf(angle);
    //ParticleSystem* sys = mParentTechnique->getParentSystem();
    //if (sys)
    {
        // Take both orientation of the node and its own orientation, based on the normal, into account
        Mat4 rotMat;
        Mat4::createRotation(static_cast<PUParticleSystem3D *>(_particleSystem)->getDerivedOrientation() * _orientation, &rotMat);
        particle->position = getDerivedPosition() + 
            /*sys->getDerivedOrientation() * */rotMat * (Vec3(_x * _radius * _emitterScale.x, 0, _z * _radius * _emitterScale.z));
    }
    //else
    //{
    //	particle->position = getDerivedPosition() + _emitterScale * ( mOrientation * Vec3(mX * mRadius, 0, mZ * mRadius) );
    //}
    particle->originalPosition = particle->position;
}
//-----------------------------------------------------------------------
void PUParticle3DCircleEmitter::initParticleDirection(PUParticle3D* particle)
{
    if (_autoDirection)
    {
        // The value of the direction vector that has been set does not have a meaning for
        // the circle emitter.
        float angle = 0.0f;
        generateAngle(angle);
        if (angle != 0.0f)
        {
            //particle->direction = (mOrientation * Vec3(mX, 0, mZ) ).randomDeviant(angle, mUpVector);
            Mat4 mat;
            Mat4::createRotation(_orientation, &mat);
            Vec3 temp = mat * Vec3(_x, 0, _z);

            particle->direction = PUParticle3DUtil::randomDeviant(temp, angle, _upVector);

            particle->originalDirection = particle->direction;
        }
        else
        {
            Mat4 rotMat;
            Mat4::createRotation(_orientation, &rotMat);
            particle->direction = Vec3(_x, 0, _z);
            particle->direction = rotMat * Vec3(_x, 0, _z);
        }
    }
    else
    {
        // Use the standard way
        PUParticle3DEmitter::initParticleDirection(particle);
    }
}

PUParticle3DCircleEmitter* PUParticle3DCircleEmitter::create()
{
    auto pe = new (std::nothrow) PUParticle3DCircleEmitter();
    pe->autorelease();
    return pe;
}

cocos2d::Quaternion PUParticle3DCircleEmitter::getRotationTo( const Vec3 &src, const Vec3& dest, const Vec3& fallbackAxis /*= Vec3::ZERO*/ ) const
{
    // Based on Stan Melax's article in Game Programming Gems
    Quaternion q;
    // Copy, since cannot modify local
    Vec3 v0 = src;
    Vec3 v1 = dest;
    v0.normalize();
    v1.normalize();

    float d = v0.dot(v1);
    // If dot == 1, vectors are the same
    if (d >= 1.0f)
    {
        return Quaternion();
    }
    if (d < (1e-6f - 1.0f))
    {
        if (fallbackAxis != Vec3::ZERO)
        {
            // rotate 180 degrees about the fallback axis
            q.set(fallbackAxis, (float)M_PI);
            //q.FromAngleAxis(Radian(Math::PI), fallbackAxis);
        }
        else
        {
            // Generate an axis
            Vec3 axis/* = Vec3::UNIT_X.crossProduct(*this)*/;
            Vec3::cross(Vec3::UNIT_X, src, &axis);
            if (axis.lengthSquared() < (1e-06 * 1e-06)) // pick another if colinear
                //axis = Vec3::UNIT_Y.crossProduct(*this);
                Vec3::cross(Vec3::UNIT_Y, src, &axis);
            axis.normalize();

            //q.FromAngleAxis(Radian(Math::PI), axis);
            q.set(axis, (float)M_PI);
        }
    }
    else
    {
        /*float s = Math::Sqrt( (1+d)*2 );*/
        float s = sqrtf( (1+d)*2 );
        float invs = 1 / s;

        Vec3 c /*= v0.crossProduct(v1)*/;
        Vec3::cross(v0, v1, &c);

        q.x = c.x * invs;
        q.y = c.y * invs;
        q.z = c.z * invs;
        q.w = s * 0.5f;
        q.normalize();
    }
    return q;
}

NS_CC_END