axmol/extensions/Particle3D/PU/CCPUCircleEmitter.cpp

/****************************************************************************
 Copyright (C) 2013 Henry van Merode. All rights reserved.
 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 https://axis-project.github.io/

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#include "CCPUCircleEmitter.h"
#include "extensions/Particle3D/PU/CCPUParticleSystem3D.h"
#include "extensions/Particle3D/PU/CCPUUtil.h"
#include "base/ccRandom.h"

NS_CC_BEGIN

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

//-----------------------------------------------------------------------
PUCircleEmitter::PUCircleEmitter()
    : PUEmitter()
    , _radius(DEFAULT_RADIUS)
    , _circleAngle(DEFAULT_ANGLE)
    , _originalCircleAngle(DEFAULT_ANGLE)
    , _step(DEFAULT_STEP)
    , _x(0.0f)
    , _z(0.0f)
    , _random(DEFAULT_RANDOM)
    , _orientation()
    , _normal(DEFAULT_NORMAL)
{}
//-----------------------------------------------------------------------
float PUCircleEmitter::getRadius() const
{
    return _radius;
}
//-----------------------------------------------------------------------
void PUCircleEmitter::setRadius(const float radius)
{
    _radius = radius;
}
//-----------------------------------------------------------------------
float PUCircleEmitter::getCircleAngle() const
{
    return _originalCircleAngle;
}
//-----------------------------------------------------------------------
void PUCircleEmitter::setCircleAngle(const float circleAngle)
{
    _originalCircleAngle = circleAngle;
    _circleAngle         = circleAngle;
}
//-----------------------------------------------------------------------
float PUCircleEmitter::getStep() const
{
    return _step;
}
//-----------------------------------------------------------------------
void PUCircleEmitter::setStep(const float step)
{
    _step = step;
}
//-----------------------------------------------------------------------
bool PUCircleEmitter::isRandom() const
{
    return _random;
}
//-----------------------------------------------------------------------
void PUCircleEmitter::setRandom(const bool random)
{
    _random = random;
}
//-----------------------------------------------------------------------
const Quaternion& PUCircleEmitter::getOrientation() const
{
    return _orientation;
}
//-----------------------------------------------------------------------
const Vec3& PUCircleEmitter::getNormal() const
{
    return _normal;
}
//-----------------------------------------------------------------------
void PUCircleEmitter::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 PUCircleEmitter::notifyStart()
{
    // Reset the attributes to allow a restart.
    _circleAngle = _originalCircleAngle;
}
//-----------------------------------------------------------------------
void PUCircleEmitter::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 PUCircleEmitter::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 = PUUtil::randomDeviant(temp, angle, _upVector);

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

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

cocos2d::Quaternion PUCircleEmitter::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;
}

void PUCircleEmitter::copyAttributesTo(PUEmitter* emitter)
{
    PUEmitter::copyAttributesTo(emitter);

    PUCircleEmitter* circleEmitter      = static_cast<PUCircleEmitter*>(emitter);
    circleEmitter->_radius              = _radius;
    circleEmitter->_circleAngle         = _circleAngle;
    circleEmitter->_originalCircleAngle = _originalCircleAngle;
    circleEmitter->_step                = _step;
    circleEmitter->_random              = _random;
    circleEmitter->_normal              = _normal;
    circleEmitter->_orientation         = _orientation;
}

PUCircleEmitter* PUCircleEmitter::clone()
{
    auto be = PUCircleEmitter::create();
    copyAttributesTo(be);
    return be;
}

NS_CC_END