axmol/extensions/Particle3D/PU/CCPUPlaneCollider.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 "CCPUPlaneCollider.h"
#include "extensions/Particle3D/PU/CCPUParticleSystem3D.h"

NS_AX_BEGIN

// Constants
const Vec3 PUPlaneCollider::DEFAULT_NORMAL(0, 0, 0);

//-----------------------------------------------------------------------
PUPlaneCollider::PUPlaneCollider() : PUBaseCollider(), _normal(DEFAULT_NORMAL) {}
PUPlaneCollider::~PUPlaneCollider(void) {}
//-----------------------------------------------------------------------
const Vec3 PUPlaneCollider::getNormal() const
{
    return _normal;
}
//-----------------------------------------------------------------------
void PUPlaneCollider::setNormal(const Vec3& normal)
{
    _normal = normal;
    _plane.redefine(_normal, getDerivedPosition());  // Changed in 1.3.1
}
//-----------------------------------------------------------------------
void PUPlaneCollider::notifyRescaled(const Vec3& /*scale*/)
{
    // Function added in 1.3.1
    _plane.redefine(_normal, getDerivedPosition());
}
//-----------------------------------------------------------------------
void PUPlaneCollider::calculateDirectionAfterCollision(PUParticle3D* particle, float timeElapsed)
{
    float directionLength = particle->direction.length();
    switch (_collisionType)
    {
    case PUBaseCollider::CT_BOUNCE:
    {
        /** If the particle is on the plane or at the back of the plane, bounce it.
            Make use of the same formula as the sphere collider.
        */
        particle->direction.normalize();
        particle->direction = 2 * (-particle->direction.dot(-_normal)) * -_normal + 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 (just in front of the plane), but keep the direction.
        @remarks
            This is not really the correct way, because the particle 'jumps'. Maybe it is better to change
            the direction parallel to the plane.
        */
        particle->position += timeElapsed * directionLength * _normal;
    }
    break;
    default:
        break;
    }
}

void PUPlaneCollider::updatePUAffector(PUParticle3D* particle, float deltaTime)
{
    // for (auto&& iter : _particleSystem->getParticles())
    {
        // PUParticle3D *particle = iter;
        _predictedPosition = particle->position + _velocityScale * particle->direction;
        bool collision     = false;

        switch (_intersectionType)
        {
        case PUBaseCollider::IT_POINT:
        {
            // Validate for a point-plane intersection (on the plane or the back side)
            // First determine whether it is now colliding (some affector made the particle move), else
            // determine whether it WILL be colliding
            if (_plane.getDistance(particle->position) <= 0.0f)
            {
                // Collision detected (re-position the particle)
                particle->position -= _velocityScale * particle->direction;
                collision = true;
            }
            else if (_plane.getDistance(_predictedPosition) <= 0.0f)
            {
                // Collision detected
                collision = true;
            }
        }
        break;

        case PUBaseCollider::IT_BOX:
        {

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

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

PUPlaneCollider* PUPlaneCollider::create()
{
    auto ppc = new PUPlaneCollider();
    ppc->autorelease();
    return ppc;
}

void PUPlaneCollider::copyAttributesTo(PUAffector* affector)
{
    PUBaseCollider::copyAttributesTo(affector);
    PUPlaneCollider* planeCollider = static_cast<PUPlaneCollider*>(affector);
    planeCollider->setNormal(_normal);
}

NS_AX_END