Spring Class Reference
[Physical forces]

Massless spring. More...

#include <spring.h>

Inheritance diagram for Spring:

List of all members.

Public Member Functions
	Spring (double restLength=0, double stiffness=1, Body *bodyPtr1=0, Body *bodyPtr2=0)
void	calcForce ()
double	restLength () const
void	setRestLength (double restLength)
double	length () const
double	stiffness () const
void	setStiffness (double stiffness)
void	setBodyPtr1 (Body *bodyPtr1)
void	setBodyPtr2 (Body *bodyPtr2)
void	setBody1 (const QString &body1)
void	setBody2 (const QString &body2)
QString	body1 () const
QString	body2 () const
Vector2d	localPosition1 () const
void	setLocalPosition1 (const Vector2d &localPosition1)
Vector2d	localPosition2 () const
void	setLocalPosition2 (const Vector2d &localPosition2)
Vector2d	position1 () const
Vector2d	position2 () const
void	worldItemRemoved (Item *item)
void	setWorld (World *world)
World *	world () const
const QString &	name () const
void	setName (const QString &name)
Body *	bodyPtr1 ()
Body *	bodyPtr2 ()

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Detailed Description

Massless spring.

Massless spring is the force between two selected bodies which equals:

where:
is Spring::stiffness
is difference of Particle::position of the first and second body
is Spring::restLength

Todo:

how to move setBody1() and setBody2() to PairForce ?

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Constructor & Destructor Documentation

Spring	(	double	restLength = 0,
		double	stiffness = 1,
		Body *	bodyPtr1 = 0,
		Body *	bodyPtr2 = 0
	)

Constructs Spring

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Member Function Documentation

void calcForce

(

)

[virtual]

Calculate force. Bodies can be accessed through this->world()->bodies()

Implements Force.

double restLength

(

)

const [inline]

Get rest length of the spring

void setRestLength

(

double

restLength

)

[inline]

Set rest length of the spring

double length

(

)

const [inline]

Get current length of the spring

double stiffness

(

)

const [inline]

Get stiffness of the spring

void setStiffness

(

double

stiffness

)

[inline]

Set stiffness of the spring

void setBodyPtr1

(

Body *

bodyPtr1

)

Set pointer to the first connected body

Todo:

XXX check world

void setBodyPtr2

(

Body *

bodyPtr2

)

Set pointer to the second connected body

Todo:

XXX check world

void setBody1

(

const QString &

body1

)

Set first connected body by name

void setBody2

(

const QString &

body2

)

Set second connected body by name

QString body1

(

)

const [inline]

Get name of the first connected body

QString body2

(

)

const [inline]

Get name of the second connected body

Vector2d localPosition1

(

)

const [inline]

Local position of the first end of the spring on the body or in the world (if the end is not connected)

void setLocalPosition1

(

const Vector2d &

localPosition1

)

[inline]

Set local position of the first end of the spring on the body or in the world (if the end is not connected)

Vector2d localPosition2

(

)

const [inline]

Local position of the second end of the spring on the body or in the world (if the end is not connected)

void setLocalPosition2

(

const Vector2d &

localPosition2

)

[inline]

Set local position of the second end of the spring on the body or in the world (if the end is not connected)

Vector2d position1

(

)

const

Position of the first end of the spring

Vector2d position2

(

)

const

Position of the second end of the spring

void worldItemRemoved

(

Item *

item

)

[virtual]

Set position of the second end of the spring (will be ignored the end is connected)

Reimplemented from Item.

void setWorld

(

World *

world

)

[virtual]

Set/change pointer to World in which this object lives

Reimplemented from Item.

World* world

(

)

const [inline, inherited]

Get pointer to World in which this object lives

Returns:

Pointer to the World or NULL

const QString& name

(

)

const [inline, inherited]

Returns name of the object

void setName

(

const QString &

name

)

[inline, inherited]

Set name of the object

Body* bodyPtr1

(

)

[inline, inherited]

Get pointer to the first body

Body* bodyPtr2

(

)

[inline, inherited]

Get pointer to the second body

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

• spring.h
• spring.cc

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