CCannon Class Reference

The cannon. More...

#include <Cannon.h>

Inheritance diagram for CCannon:

Collaboration diagram for CCannon:

Public Member Functions
void	Initialize ()
	Set up a cannon.
void	Explode ()
	Make cannon explode.
void	Fire ()
	Fire the cannon.
void	SetSpeed (float)
	Set the motor speed in the wheel joints.
const bool	IsDead () const
	Whether cannon has exploded.
const Vector2	GetPos () const
	Get cannon position.

Private Member Functions
b2Body *	CreateBase (float, float, int)
	Create a cannon base in Physics World.
b2Body *	CreateBarrel (float, float, int)
	Create a cannon barrel in Physics World.
b2Body *	CreateWheel (float, float, int)
	Create a cannon wheel in Physics World.
void	DeliverImpulse (b2Body *, const b2Vec2 &)
	Apply an impulse in Physics World.
void	MakeCollide (b2Body *b)
	Make cannon parts collide-able in Physics World.

Private Attributes
b2Body *	m_pBarrel = nullptr
	Pointer to cannon barrel in Physics World.
b2Body *	m_pBase = nullptr
	Pointer to cannon base in Physics World.
b2Body *	m_pWheel1 = nullptr
	Pointer to cannon wheel in Physics World.
b2Body *	m_pWheel2 = nullptr
	Pointer to cannon wheel in Physics World.
b2WheelJoint *	m_pWheelJoint1 = nullptr
	Pointer to cannon wheel joint in Physics World.
b2WheelJoint *	m_pWheelJoint2 = nullptr
	Pointer to cannon wheel joint in Physics World.
b2RevoluteJoint *	m_pBarrelJoint = nullptr
	Pointer to cannon barrel body in Physics World.
bool	m_bExploded = false
	Whether cannon has exploded.

Additional Inherited Members
Static Protected Attributes inherited from CCommon
static b2World *	m_pPhysicsWorld = nullptr
	Pointer to Box2D Physics World.
static CBox2DRenderer *	m_pRenderer = nullptr
	Pointer to Render World.
static CObjectManager *	m_pObjectManager = nullptr
	Pointer to the Object Manager.
static Sage::CParticleEngine2D *	m_pFrontParticleEngine = nullptr
	Pointer to front particle engine.
static Sage::CParticleEngine2D *	m_pBackParticleEngine = nullptr
	Pointer to front particle engine.
static CCannon *	m_pCannon = nullptr
	Pointer to a cannon.
static Vector2	m_vBellPos [NUMBELLS] = {Vector2(0.0f)}
	Positions of bells.
static float	m_fGravity = 20.0f
	Magnitude of gravity in Render World units.
static eDrawMode	m_eDrawMode = eDrawMode::Sprites
	Draw mode.

Detailed Description

The cannon is a composite made up of several sprites in Render World and several bodies in Physics World. It represents the player.

Member Function Documentation

CreateBarrel()

b2Body * CCannon::CreateBarrel ( float x, float y, int nIndex )

private

Parameters

x	Cannon barrel's x coordinate in Render World.
y	Cannon barrel's y coordinate in Render World.
nIndex	Cannon barrel's collision group index.

Returns

Pointer to cannon barrel body in Physics World.

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CreateBase()

b2Body * CCannon::CreateBase ( float x, float y, int nIndex )

private

Parameters

x	Cannon base's x coordinate in Render World.
y	Cannon base's y coordinate in Render World.
nIndex	Cannon base's collision group index.

Returns

Pointer to cannon base body in Physics World.

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CreateWheel()

b2Body * CCannon::CreateWheel ( float x, float y, int nIndex )

private

Parameters

x	Cannon wheel's x coordinate in Render World.
y	Cannon wheel's y coordinate in Render World.
nIndex	Cannon wheel's collision group index.

Returns

Pointer to cannon wheel body in Physics World.

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DeliverImpulse()

void CCannon::DeliverImpulse ( b2Body * b, const b2Vec2 & v )

private

Deliver an impulse to part of the cannon, which is made up of many bodies in Physics World.

Parameters

b	Body to apply impulse to.
v	Vector direction and magnitude of impulse.

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Explode()

void CCannon::Explode

(

)

Make the cannon explode by destroying the joints, resetting their collision group indices so that they can collide.

smoke

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Fire()

void CCannon::Fire

(

)

Create cannonballs in both Render World and Physics World and send them on their way. The tune, the delay to the first note, and the time between notes are hard-coded. Apply a recoil impulse to the cannon in Physics World, stop the wheel motors, and emit a puff of smoke..

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GetPos()

const Vector2 CCannon::GetPos

(

)

const

Reader function for the cannon's position.

Returns

Cannon position in Render World.

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Initialize()

void CCannon::Initialize

(

)

Create a cannon in Physics World and the Object Manager, linking the two representations together. All positions are hard-coded.

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IsDead()

const bool CCannon::IsDead

(

)

const

Determine whether the cannon has exploded already.

Returns

true If it's dead, Dave.

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MakeCollide()

void CCannon::MakeCollide ( b2Body * b )

private

Reset the collision group index for part of cannon, which is made up of many bodies in Physics World.

Parameters

b	Body to reset collision group index of.

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SetSpeed()

void CCannon::SetSpeed

(

float

s

)

Start the cannon moving using motors in the wheels.

Parameters

s	Speed of cannon. Negative means left, positive means right.

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