CPulley Class Reference

The pulley class. More...

#include <Pulley.h>

Inheritance diagram for CPulley:

Collaboration diagram for CPulley:

Public Member Functions
	CPulley ()
	Constructor.
void	Move ()
	Rotate the pulley wheels.
void	Action ()
	Create or delete elephant.
Public Member Functions inherited from CLevel
	CLevel (eSprite)
virtual	~CLevel ()
	Default constructor.
virtual void	Draw ()
	Draw objects in level.

Private Member Functions
void	CreateGround ()
	Create the ground.
b2Body *	CreateWheel (float, float)
	Create a pulley wheel.
b2Body *	CreateCrate (float, float)
	Create the elephant's crate.
b2Body *	CreateObject (const b2Vec2 &, float, eSprite)
	Create an object.

Private Attributes
b2PulleyJoint *	m_pJoint = nullptr
	Pointer to the pulley joint.
float	m_fJointLenA = 0
	Length of left side of pulley.
b2Body *	m_pWheel0 = nullptr
	Pointer to the left pulley wheel.
b2Body *	m_pWheel1 = nullptr
	Pointer to the right pulley wheel.
float	m_fWheelRad = 1
	Pulley wheel radius.
b2Vec2	m_vElephantSpawnPt
	Elephant spawn point.
bool	m_bHasElephant = false
	Has elephant flag.

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 pair of objects connected by a pulley joint, with a pair of pulley wheels that are animated in code.

Member Function Documentation

Action()

void CPulley::Action ( )

virtual

If there is an elephant, then delete it. If there is no elephant, then create one at its spawn point offset by a small pseudo-random amount to make the crate swing about. This function assumes that the elephant is the last thing created, that is, it is the last thing in the object list.

Reimplemented from CLevel.

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CreateCrate()

b2Body * CPulley::CreateCrate ( float x, float y )

private

The bucket is the thing on the left that the elephant falls into. It consists of a left side, a right side, and a bottom, all of which are rectangles.

Parameters

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

Returns

Pointer to physics body.

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CreateGround()

void CPulley::CreateGround ( )

private

Create the ground, which is an edge in Physics World at the bottom of the window.

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CreateObject()

b2Body * CPulley::CreateObject ( const b2Vec2 & v, float d, eSprite t )

private

Create an object, used for the safe and the elephant.

Parameters

v	Position in Physics World.
d	Object density.
t	Type of object to be created.

Returns

Pointer to physics body.

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CreateWheel()

b2Body * CPulley::CreateWheel ( float x, float y )

private

The pulley wheels are going to be static objects that we rotate ourselves depending on the positions of the objects that the pulley is attached to.

Parameters

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

Returns

Pointer to physics body.

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Move()

void CPulley::Move ( )

virtual

Animate the pulley wheels by setting their orientations to reflect the amount of rope that has gone over them.

Reimplemented from CLevel.