axmol/extensions/Particle3D/PU/CCPUSphereCollider.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://axmolengine.github.io/

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#include "CCPUSphereCollider.h"
#include "extensions/Particle3D/PU/CCPUParticleSystem3D.h"

NS_AX_BEGIN
// Constants
const float PUSphereCollider::DEFAULT_RADIUS = 100.0f;

//-----------------------------------------------------------------------
PUSphereCollider::PUSphereCollider() : PUBaseCollider(), _radius(DEFAULT_RADIUS), _innerCollision(false) {}

PUSphereCollider::~PUSphereCollider(void) {}

//-----------------------------------------------------------------------
float PUSphereCollider::getRadius() const
{
    return _radius;
}
//-----------------------------------------------------------------------
void PUSphereCollider::setRadius(const float radius)
{
    _radius = radius;
    _sphere.setRadius(_radius);
}
//-----------------------------------------------------------------------
bool PUSphereCollider::isInnerCollision() const
{
    return _innerCollision;
}
//-----------------------------------------------------------------------
void PUSphereCollider::setInnerCollision(bool innerCollision)
{
    _innerCollision = innerCollision;
}
//-----------------------------------------------------------------------
void PUSphereCollider::calculateDirectionAfterCollision(PUParticle3D* particle, Vec3 distance, float distanceLength)
{
    switch (_collisionType)
    {
    case PUBaseCollider::CT_BOUNCE:
    {
        /** If the particle is on the surface (or just inside the sphere); bounce it
            Make use of formula R = 2 * (-I dot N) * N + I, where
            R = the new direction vector
            I = the old (unit) direction vector before the collision
            N = the Normal at the collision point
        */
        float directionLength = particle->direction.length();
        particle->direction.normalize();
        distance.normalize();
        particle->direction = 2 * (-particle->direction.dot(distance)) * distance + particle->direction;

        // Adjust to original speed
        particle->direction *= directionLength;

        // Accelerate/slow down, using the bounce value
        particle->direction *= _bouncyness;
    }
    break;
    case PUBaseCollider::CT_FLOW:
    {
        /** Reset the position (on the sphere), but keep the direction.
            This doesn't really work good for box-type collisions, because it doesn't take the particle
            dimensions into account.
        */
        float scaledRadius = 0.3333f * (_affectorScale.x + _affectorScale.y + _affectorScale.z) * _radius;
        particle->position = _derivedPosition + distance * (scaledRadius / distanceLength);
    }
    break;
    default:
        break;
    }
}

void PUSphereCollider::updatePUAffector(PUParticle3D* particle, float /*deltaTime*/)
{
    // for (auto&& iter : _particleSystem->getParticles())
    {
        // PUParticle3D *particle = iter;
        _predictedPosition   = particle->position + _velocityScale * particle->direction;
        bool collision       = false;
        Vec3 distance        = particle->position - _derivedPosition;
        float distanceLength = distance.length();
        float scaledRadius =
            0.3333f * (_affectorScale.x + _affectorScale.y + _affectorScale.z) * _radius;  // Scaling changed in V 1.3.1

        switch (_intersectionType)
        {
        case PUBaseCollider::IT_POINT:
        {
            // Validate for a point-sphere intersection
            if (_innerCollision == (distanceLength > scaledRadius))
            {
                // Collision detected (re-position the particle)
                particle->position -= _velocityScale * particle->direction;
                collision = true;
            }
            else
            {
                distance       = _predictedPosition - _derivedPosition;
                distanceLength = distance.length();
                if (_innerCollision == (distanceLength > scaledRadius))
                {
                    // Collision detected
                    collision = true;
                }
            }
        }
        break;

        case PUBaseCollider::IT_BOX:
        {
            //// Validate for a box-sphere intersection
            // if (particle->particleType != Particle::PT_VISUAL)
            //	break;
            AABB box;
            populateAlignedBox(box, particle->position, particle->width, particle->height, particle->depth);

            // FIXME
            // if (_innerCollision != box.intersects(_sphere))
            //{
            //	// Collision detected (re-position the particle)
            //	particle->position -= _velocityScale * particle->direction;
            //	collision = true;
            // }
            // else
            //{
            //	AABB box;
            //	populateAlignedBox(box,
            //		_predictedPosition,
            //		particle->width,
            //		particle->height,
            //		particle->depth);
            //	if (_innerCollision != box.intersects(_sphere))
            //	{
            //		// Collision detected
            //		collision = true;
            //	}
            // }
        }
        break;
        }

        if (collision)
        {
            calculateDirectionAfterCollision(particle, distance, distanceLength);
            calculateRotationSpeedAfterCollision(particle);
            particle->addEventFlags(PUParticle3D::PEF_COLLIDED);
        }
    }
}

void PUSphereCollider::preUpdateAffector(float /*deltaTime*/)
{
    // Calculate the affectors' center position.
    _sphere.setCenter(getDerivedPosition());
}

PUSphereCollider* PUSphereCollider::create()
{
    auto psc = new PUSphereCollider();
    psc->autorelease();
    return psc;
}

void PUSphereCollider::copyAttributesTo(PUAffector* affector)
{
    PUAffector::copyAttributesTo(affector);

    PUSphereCollider* sphereCollider = static_cast<PUSphereCollider*>(affector);
    sphereCollider->_radius          = _radius;
    sphereCollider->_sphere          = _sphere;
    sphereCollider->_innerCollision  = _innerCollision;
}

NS_AX_END