CNewtonsCradle Class Reference

Newton's cradle. More...

#include <NewtonsCradle.h>

Inheritance diagram for CNewtonsCradle:

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Public Member Functions
	CNewtonsCradle ()
	Constructor.
	~CNewtonsCradle ()
	Destructor.
void	Move ()
	Swivel Isaac Newton's eyeballs.
void	Draw ()
	Draw level.
void	Action ()
	Reverse motor.
Public Member Functions inherited from CLevel
	CLevel (eSprite)
virtual	~CLevel ()
	Default constructor.

Private Member Functions
void	CreateBall (float, float)
	Create a ball.
void	Create ()
	Create all balls.
void	ResetBalls ()
	Reset all balls to initial conditions.
b2Body *	CreateCradle (float, float)
	Create the cradle.

Private Attributes
CSirIsaacNewton *	m_pIsaac = nullptr
	Isaac Newton caricature.
const UINT	m_nNumBalls = 6LLU
	Number of balls.
UINT	m_nBallsToMove = 1LLU
	Number of balls in to move at a time.
bool	m_bBallsStillMoving = false
	Flag for moving balls.

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

Newton's Cradle has a bunch of balls on strings hanging from a cradle. It's a common executive toy. For those in the know, it demonstrates the conservation of momentum and energy in collisions.

Constructor & Destructor Documentation

CNewtonsCradle()

CNewtonsCradle::CNewtonsCradle

(

)

Create the cradle, the balls, the distance joints connecting the former to the latter, and the line objects that represent them. The balls are created in left-to-right order.

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Member Function Documentation

Action()

void CNewtonsCradle::Action ( )

virtual

If there are balls still moving, then reset them to the initial conditions. Otherwise, deliver an impulse to the leftmost balls, incrementing the number affected each time this function is called when the balls are not moving. The balls are considered moving if and impulse was applied the last time this function is called. This function assumes that the balls were created in left-to-right order, that is, they appear in the object list from left to right, with m_stdObject[0] being the leftmost ball.

Reimplemented from CLevel.

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Create()

void CNewtonsCradle::Create ( )

private

Create the cradle, the balls, their joints, and their lines.

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CreateBall()

void CNewtonsCradle::CreateBall ( float x, float y )

private

Create a ball bearing object and Physics World body.

Parameters

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

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CreateCradle()

b2Body * CNewtonsCradle::CreateCradle ( float x, float y )

private

The cradle except for the bar at the top of the cradle.

Parameters

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

Returns

Pointer to the Physics World body.

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Draw()

void CNewtonsCradle::Draw ( )

virtual

Draw the background, the objects in this level, and the Isaac Newton head.

Reimplemented from CLevel.

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Move()

void CNewtonsCradle::Move ( )

virtual

Move Isaac Newton's eyeballs swivel in the direction of the last ball in the ball list, which is hopefully the rightmost one.

Reimplemented from CLevel.

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ResetBalls()

void CNewtonsCradle::ResetBalls ( )

private

Reset the balls, their lines, and their joints to the initial conditions.

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