CRackAndPinion Class Reference

Rack and pinion. More...

#include <RackAndPinion.h>

Inheritance diagram for CRackAndPinion:

Public Member Functions
	CRackAndPinion (float, float)
	Constructor. More...
void	move ()
	Reverse the rack when it hits the limits. More...
void	reverse ()
	Reverse the motor. More...

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

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
Static Protected Attributes inherited from CCommon
static b2World *	m_pPhysicsWorld = nullptr
	Pointer to Box2D Physics World.
static CRenderer *	m_pRenderer = nullptr
	Pointer to the renderer.
static CObjectManager *	m_pObjectManager = nullptr
	Pointer to the object manager.
static CWindmill *	m_pWindmill = nullptr
	Pointer to windmill.
static CGear *	m_pGear = nullptr
	Pointer to gear system.
static CNautilusGear *	m_pNautilusGear = nullptr
	Pointer to Nautilus gear system.
static CRackAndPinion *	m_pRackAndPinion = nullptr
	Pointer to rack-and-pinion.
static CCar *	m_pCar = nullptr
	Pointer to car.
static CRamp *	m_pRamp = nullptr
	Pointer to ramp.
static CNewtonsCradle *	m_pNewtonsCradle = nullptr
	Pointer to Newton's Cradle.
static CPulley *	m_pPulley = nullptr
	Pointer to pulley system.
static eLevel	m_eCurLevel = eLevel::Windmill
	Current level.

Detailed Description

Rack and pinion.

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	(	float	x,
		float	y
	)

Constructor.

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.

Parameters

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

Member Function Documentation

CreateBase()

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

private

Create an invisible gentry.

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.

CreatePinion()

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

private

Create a pinion.

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.

CreateRack()

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

private

Create a rack.

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.

move()

void CRackAndPinion::move

(

)

Reverse the rack when it hits the limits.

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

reverse()

void CRackAndPinion::reverse

(

)

Reverse the motor.

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