CCannon Class Reference

The cannon. More...

#include <Cannon.h>

Inheritance diagram for CCannon:

Collaboration diagram for CCannon:

Public Member Functions
	CCannon ()
	Constructor.
void	Explode ()
	Make cannon explode.
bool	Fire ()
	Fire the cannon.
void	BarrelUp (float)
	Rotate the cannon barrel.
void	SetSpeed (float)
	Set the motor speed in the wheel joints.
void	CoolDown ()
	Cannon temperature drops over time.
const UINT	GetNumFired () const
	Get number of cannonballs fired in this level.
const bool	IsDead () const
	Whether cannon has exploded.
const Vector2	GetPos () const
	Get cannon position.
void	GetTemps (float &, float &) const
	Get current and max temperatures.

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 &, const b2Vec2 &=b2Vec2(0, 0))
	Apply an impulse in Physics World.
void	MakeCollide (b2Body *)
	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.
float	m_fTemp = 0.0f
	Cannon temperature.
float	m_fMaxTemp = 0.0f
	Cannon maximum allowable temperature.
UINT	m_nBallsFired = 0
	Number of cannonballs fired in current level.
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 object manager.
static Sage::CParticleEngine2D *	m_pParticleEngine = nullptr
	Pointer to particle engine.
static eDrawMode	m_eDrawMode = eDrawMode::Sprites
	Draw mode.
static bool	m_bEasterEgg = false
	Easter egg!

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.

Constructor & Destructor Documentation

CCannon()

CCannon::CCannon

(

)

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

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Member Function Documentation

BarrelUp()

void CCannon::BarrelUp

(

float

a

)

Rotate the cannon barrel up or down by a small increment.

Parameters

a	Angle increment in radians. Positive means up, negative means down.

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CoolDown()

void CCannon::CoolDown

(

)

Cool the cannon's temperature, unless it is too high already, in which case mark it for exploding on the next fire.

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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, const b2Vec2 & ds = b2Vec2(0, 0) )

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.
ds	Vector dispolacement to point at which impulse is applied.

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Explode()

void CCannon::Explode

(

)

Make the cannon explode by destroying the joints, applying impulses to cannon parts so that they fly apart, and resetting their collision group indices so that they can collide.

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Fire()

bool CCannon::Fire

(

)

Create a cannonball in both Render World and Physics World and send it on its way. Apply a recoil impulse to the cannon in Physics World. Increment the cannon's temperature. All this is assuming that the cannon isn't nose down and hasn't already exploded.

Returns

true if succeeded in firing the cannonball.

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GetNumFired()

const UINT CCannon::GetNumFired

(

)

const

Return the number of cannonballs fired in this level of the game.

Returns

Number of cannonballs fired.

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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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GetTemps()

void CCannon::GetTemps	(	float &	tcur,
		float &	tmax ) const

Reader function for the current and max temperatures.

Parameters

tcur	[OUT] Current temperature.
tmax	[OUT] Maximum temperature experienced.

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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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