genesis-3d_engine/Engine/addons/particles/affectors/particleLimitAffector.cc

/****************************************************************************
Copyright (c) 2011-2013,WebJet Business Division,CYOU

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#include "stdneb.h"
#include "particleLimitAffector.h"
#include "particles/particleaffector.h"
#include "particles/particle.h"


namespace Particles
{
	using namespace Math;

	__ImplementClass(Particles::LimitAffector, CPFCC::AFFECTOR_LIMIT, Particles::ParticleAffector);	

	//-----------------------------------------------------------------------
	LimitAffector::LimitAffector(void) : ParticleAffector()
		, mSeparateAxis(false)
	{
		mName = "LimitAffector";
		mLimitX.SetScalar(0.0f);
		mLimitY.SetScalar(0.0f);
		mLimitZ.SetScalar(0.0f);

		mLimitValue.SetScalar(0.1f);
		//mColorMap
	}
	//-----------------------------------------------------------------------
	void LimitAffector::_affect(Particle* particle)
	{
		if(!GetEnable())
			return;
		if (particle)
		{

			float curTime = (particle->mTotalTimeToLive - particle->mTimeToLive)/particle->mTotalTimeToLive;

			//mAxisX
			float limitX = mLimitX.Calculate(curTime,particle->mRandom0);
			//mAxisY
			float limitY = mLimitY.Calculate(curTime,particle->mRandom1);
			//mAxisZ
			float limitZ = mLimitZ.Calculate(curTime,particle->mRandom2);

			//mDampen
			float _value = mLimitValue.Calculate(curTime,particle->mRandom3);


			Math::float3 velocity = particle->mDirection;

			if (mSeparateAxis)
			{
				Math::scalar length = velocity.length();

				length = LimitVelocity(length, limitX, _value);
				velocity.normalise();
				velocity = velocity * length;
			}
			else
			{
				velocity.x() = LimitVelocity(velocity.x(), limitX, _value);
				velocity.y() = LimitVelocity(velocity.y(), limitY, _value);
				velocity.z() = LimitVelocity(velocity.z(), limitZ, _value);
			}

			particle->mDirection = velocity;

		}

	}
	//------------------------------------------------------------------------
	float LimitAffector::LimitVelocity(float velocity, float _limit, float _value)
	{
		if(velocity > _limit)
			return _limit + (velocity - _limit)*(1.0f - _value);
		if(velocity < -_limit)
			return -_limit - (-_limit - velocity)*(1.0f - _value);
		return velocity;
	}
	//------------------------------------------------------------------------
	void LimitAffector::_preProcessParticles(void)
	{

	}

	//--------------------------------------------------------------------------------
	Math::MinMaxCurve* LimitAffector::getMinMaxCurve(ParticleCurveType axis)
	{
		switch(axis)
		{
		case 			Affector_LimitX:
			return  &mLimitX;
		case			Affector_LimitY:
			return &mLimitY;
		case			Affector_LimitZ:
			return &mLimitZ;
		case        Affector_LimitValue:
			return &mLimitValue;
		default:
			return Super::getMinMaxCurve(axis);					
		}
	}

}