axmol/extensions/Particle3D/ParticleUniverse/ParticleAffectors/CCPUParticle3DPlaneCollider.cpp

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 Copyright (C) 2013 Henry van Merode. All rights reserved.
 Copyright (c) 2015 Chukong Technologies Inc.
 
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#include "CCPUParticle3DPlaneCollider.h"
#include "extensions/Particle3D/ParticleUniverse/CCPUParticleSystem3D.h"

NS_CC_BEGIN

// Constants
const Vec3 PUParticle3DPlaneCollider::DEFAULT_NORMAL(0, 0, 0);

//-----------------------------------------------------------------------
PUParticle3DPlaneCollider::PUParticle3DPlaneCollider(void) : 
    PUParticle3DBaseCollider(),
    _predictedPosition(Vec3::ZERO),
    _normal(DEFAULT_NORMAL)
{
}
PUParticle3DPlaneCollider::~PUParticle3DPlaneCollider( void )
{

}
//-----------------------------------------------------------------------
const Vec3 PUParticle3DPlaneCollider::getNormal(void) const
{
    return _normal;
}
//-----------------------------------------------------------------------
void PUParticle3DPlaneCollider::setNormal(const Vec3& normal)
{
    _normal = normal;
    _plane.redefine(_normal, getDerivedPosition()); // Changed in 1.3.1
}
//-----------------------------------------------------------------------
void PUParticle3DPlaneCollider::notifyRescaled(const Vec3& scale)
{
    // Function added in 1.3.1
    _plane.redefine(_normal, getDerivedPosition());
}
//-----------------------------------------------------------------------
void PUParticle3DPlaneCollider::calculateDirectionAfterCollision(PUParticle3D* particle, float timeElapsed)
{
    float directionLength = particle->direction.length();
    switch (_collisionType)
    {
        case PUParticle3DBaseCollider::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 PUParticle3DBaseCollider::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 PUParticle3DPlaneCollider::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 PUParticle3DBaseCollider::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 PUParticle3DBaseCollider::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);
        }
    }

}

PUParticle3DPlaneCollider* PUParticle3DPlaneCollider::create()
{
    auto ppc = new (std::nothrow) PUParticle3DPlaneCollider();
    ppc->autorelease();
    return ppc;
}

NS_CC_END