Integration Class Reference

handles integration to find next position and velocity of particles More...

#include <Integration.h>

List of all members.

Public Member Functions
	Integration (const IntegrationType _integrationType, const ngl::Real _timestep)
	ctor
void	integrateNext (Particle &io_currentParticle)
	integrate next velocity and position of a particle
IntegrationType	getIntegrationType () const
	get the integration method
void	setIntegrationType (const IntegrationType _v)
	sets the integration method
void	setIntegrationType (const int _v)
	set the integration method of the simulation
ngl::Real	getTimestep () const
	get the timestep of the simulation
void	setTimestep (const ngl::Real _v)
	set the timestep of the simulation
Private Member Functions
void	evaluateSemiImplicitEuler (Particle &io_currentParticle)
	integrate a particle using semi implicit euler
void	evaluateLeapfrog (Particle &io_currentParticle)
	integrate a particle using leapfrog
Private Attributes
IntegrationType	m_integrationType
	integration method
ngl::Real	m_timestep
	timestep of simulation

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Detailed Description

handles integration to find next position and velocity of particles

Definition at line 23 of file Integration.h.

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Constructor & Destructor Documentation

Integration::Integration	(	const IntegrationType	_integrationType,
		const ngl::Real	_timestep
	)

ctor

Parameters:

[in]	_integrationType	the integration method
[in]	_timestep	the timestep of the simulation

Definition at line 7 of file Integration.cpp.

{
    m_integrationType = _integrationType;
    m_timestep = _timestep;
}

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Member Function Documentation

void Integration::evaluateLeapfrog

(

Particle &

io_currentParticle

)

[private]

integrate a particle using leapfrog

Parameters:

[in,out]

io_currentParticle

the particle that is being affected

Definition at line 36 of file Integration.cpp.

References Particle::getAcceleration(), Particle::getLastAcceleration(), Particle::getPosition(), Particle::getVelocity(), m_timestep, Particle::updatePosition(), and Particle::updateVelocity().

{
    //modified leapfrog from http://en.wikipedia.org/wiki/Leapfrog_integration
    io_currentParticle.updateVelocity(io_currentParticle.getVelocity() + (((io_currentParticle.getLastAcceleration() + io_currentParticle.getAcceleration()) / 2.0) * m_timestep));

    io_currentParticle.updatePosition(io_currentParticle.getPosition() + (io_currentParticle.getVelocity() * m_timestep) + ((io_currentParticle.getLastAcceleration() / 2.0) * m_timestep * m_timestep));
}

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void Integration::evaluateSemiImplicitEuler

(

Particle &

io_currentParticle

)

[private]

integrate a particle using semi implicit euler

Parameters:

[in,out]

io_currentParticle

the particle that is being affected

Definition at line 28 of file Integration.cpp.

References Particle::getAcceleration(), Particle::getPosition(), Particle::getVelocity(), m_timestep, Particle::updatePosition(), and Particle::updateVelocity().

{
    //semi implicit euler from http://en.wikipedia.org/wiki/Semi-implicit_Euler
    io_currentParticle.updateVelocity(io_currentParticle.getVelocity() + (io_currentParticle.getAcceleration() * m_timestep));

    io_currentParticle.updatePosition(io_currentParticle.getPosition() + (io_currentParticle.getVelocity() * m_timestep));
}

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IntegrationType Integration::getIntegrationType

(

)

const [inline]

get the integration method

Definition at line 40 of file Integration.h.

References m_integrationType.

{ return m_integrationType; }

ngl::Real Integration::getTimestep

(

)

const [inline]

get the timestep of the simulation

Definition at line 51 of file Integration.h.

References m_timestep.

{ return m_timestep; }

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void Integration::integrateNext

(

Particle &

io_currentParticle

)

integrate next velocity and position of a particle

Parameters:

[in,out]

io_currentParticle

the particle that is being affected

Definition at line 16 of file Integration.cpp.

References evaluateLeapfrog(), evaluateSemiImplicitEuler(), LEAPFROG, m_integrationType, and SEMI_IMPLICIT_EULER.

{
    //calls user-chosen integrator
    switch (m_integrationType)
    {
        case SEMI_IMPLICIT_EULER: { evaluateSemiImplicitEuler(io_currentParticle); break; }
        case LEAPFROG: { evaluateLeapfrog(io_currentParticle); break; }

        default : break;
    }
}

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void Integration::setIntegrationType

(

const int

_v

)

[inline]

set the integration method of the simulation

Parameters:

[in]

_v

new integration method

Definition at line 48 of file Integration.h.

References m_integrationType.

{ m_integrationType = (IntegrationType)_v; }

void Integration::setIntegrationType

(

const IntegrationType

_v

)

[inline]

sets the integration method

Parameters:

[in]

_v

the new integration method

Definition at line 44 of file Integration.h.

References m_integrationType.

{ m_integrationType = _v; }

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void Integration::setTimestep

(

const ngl::Real

_v

)

[inline]

set the timestep of the simulation

Parameters:

[in]

_v

new timestep

Definition at line 55 of file Integration.h.

References m_timestep.

{ m_timestep = _v; }

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Member Data Documentation

IntegrationType Integration::m_integrationType [private]

integration method

Definition at line 60 of file Integration.h.

ngl::Real Integration::m_timestep [private]

timestep of simulation

Definition at line 63 of file Integration.h.

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The documentation for this class was generated from the following files:

• include/Integration.h
• src/Integration.cpp