CRackAndPinion Class Reference

Rack and pinion. More...

#include <RackAndPinion.h>

Inheritance diagram for CRackAndPinion:

Collaboration diagram for CRackAndPinion:

Public Member Functions
	CRackAndPinion ()
	Constructor.
	~CRackAndPinion ()
	Destructor.
void	Move ()
	Reverse the rack when it hits the limits.
void	Action ()
	Reverse the motor.
Public Member Functions inherited from CLevel
	CLevel (eSprite)
virtual	~CLevel ()
	Default constructor.
virtual void	Draw ()
	Draw objects in level.

Private Member Functions
b2Body *	CreateRack (float, float)
	Create a rack.
b2Body *	CreatePinion (float, float)
	Create a pinion.
b2Body *	CreateBase (float, float)
	Create an invisible gantry.

Private Attributes
b2RevoluteJoint *	m_pRevoluteJoint = nullptr
	Pointer to revolute joint for pinion.
b2PrismaticJoint *	m_pPrismaticJoint = nullptr
	Pointer to prismatic joint for rack.
float	m_fLimit = 0
	Translation limit for prismatic joint.

Additional Inherited Members
Protected Member Functions inherited from CLevel
CLineObject *	CreateLine (b2Body *, const b2Vec2 &, bool, b2Body *, const b2Vec2 &, bool)
	Create new line object.
Protected Attributes inherited from CLevel
std::vector< CObject * >	m_stdObject
	Object pointers.
std::vector< CLineObject * >	m_stdLine
	Line list.
eSprite	m_eBgSprite
	Type of background sprite.
Static Protected Attributes inherited from CCommon
static b2World *	m_pPhysicsWorld = nullptr
	Pointer to Box2D Physics World.
static CBox2DRenderer *	m_pRenderer = nullptr
	Pointer to the renderer.
static CLevel *	m_pLevel = nullptr
	Pointer to current level.
static eLevel	m_eCurLevel = eLevel::Windmill
	Current level.
static eDrawMode	m_eDrawMode = eDrawMode::Sprites
	Draw mode.

Detailed Description

A rack and pinion connected by a prismatic joint in Physics World. A rack and pinion is a type of linear actuator that comprises a pair of gears which convert rotational motion into linear motion. A circular gear called the pinion engages teeth on a linear gear bar called the rack. Rotational motion applied to the pinion causes the rack to move relative to the pinion, thereby translating the rotational motion of the pinion into linear motion.

Constructor & Destructor Documentation

CRackAndPinion()

CRackAndPinion::CRackAndPinion

(

)

Create a rack and a pinion at a given position in Physics World, with a revolute joint for the pinion and a prismatic joint for the rack. The revolute joint has a motor.

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Member Function Documentation

Action()

void CRackAndPinion::Action ( )

virtual

Reverse the pinion by setting the motor speed on the revolute joint.

Reimplemented from CLevel.

CreateBase()

b2Body * CRackAndPinion::CreateBase ( float x, float y )

private

Create an invisible base to attach the pinion to. The base has no sprite and no shape in Physics World. The latter means it doesn't collide with anything.

Parameters

x	X coordinate in Physics World units.
y	Y coordinate in Physics World units.

Returns

Pointer to the base body in Physics World.

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CreatePinion()

b2Body * CRackAndPinion::CreatePinion ( float x, float y )

private

Create a pinion at a given position in Physics World.

Parameters

x	X coordinate in Physics World units.
y	Y coordinate in Physics World units.

Returns

Pointer to the pinion body in Physics World.

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CreateRack()

b2Body * CRackAndPinion::CreateRack ( float x, float y )

private

Create a rack object at a given position in Physics World.

Parameters

x	X coordinate in Physics World units.
y	Y coordinate in Physics World units.

Returns

Pointer to the rack body in Physics World.

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Move()

void CRackAndPinion::Move ( )

virtual

Monitor the pinion offset, and if it is p against the stops, then reverse the direction of the motor on the revolute joint.

Reimplemented from CLevel.

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