CCrowObject Class Reference

Crow object. More...

#include <CrowObject.h>

Inheritance diagram for CCrowObject:

Collaboration diagram for CCrowObject:

Public Member Functions
	CCrowObject (const Vector3 &)
	Constructor.
void	Move ()
	Move depending on time and speed.
Public Member Functions inherited from CObject
	CObject ()
	Default constructor.
	CObject (eSprite, const Vector3 &)
	Constructor.
virtual	~CObject ()
	Destructor.
void	Kill ()
	Kill the object.
bool	TooOld ()
	Kill me.
void	GetRenderList (std::vector< Sage::CSpriteDesc3D > &)
	Get render list.
const Vector3 &	GetPos () const
	Get position.
const Vector3 &	GetVel () const
	Get velocity.
const float	GetRoll () const
	Get roll angle.
const eSprite	GetType () const
	Get sprite type.
virtual void	SetVel (const Vector3 &)
	Set velocity.
virtual void	SetRoll (float)
	Set roll angle.
void	SetRotSpeed (float)
	Set roll speed.
void	SetLifeTime (float)
	Set lifetime.
Public Member Functions inherited from CCommon
float	Wrap (float)
	Wrap horizontal distance.

Private Types
enum	eState { Cruising , Avoiding }
	Mental states for the crow. More...

Private Member Functions
void	Think ()
	Artificial intelligence.
void	CruisingAi ()
	Ai for cruising along.
void	AvoidingAi ()
	Ai for avoiding plane.
void	SetState (eState state)
	Change state.

Private Attributes
const float	CLOSE_DISTANCE = 300.0f
	Distance for close to plane.
const float	FAR_DISTANCE = 500.0f
	Distance for "far from" plane.
const float	FALLBACK_HT = 150.0f
	Fall back at this vertical distance from plane.
const float	BEHIND_DISTANCE = -5.0f
	Horizontal distance considered to be behind plane.
eState	m_eState = eState::Cruising
	Current state.
Vector3	m_vPlanePos = Vector3::Zero
	Plane current position.
float	m_fPlaneDist = FLT_MAX
	Euclidean distance to plane.
float	m_fPlaneDistX = FLT_MAX
	Horizontal distance to plane.
float	m_fPlaneDistY = FLT_MAX
	Vertical distance to plane.
float	m_fMaxAltitude = 0.0f
	Maximum altitude.
float	m_fMinAltitude = 0.0f
	Minimum altitude.
float	m_fDeltaAltitude = 0.0f
	Change in altitude.
float	m_fDesiredHeight = 0.0f
	Desired altitude.
float	m_fHeightTime = 0.0f
	Time between height changes.
float	m_fHeightDelayTime = 0.0f
	Time to next height change.
float	m_fSpeedVariationTime = 0.0f
	Last time speed varied.
float	m_fSpeedVariationDuration = 0.0f
	Time to next speed variation.
float	m_fLastAiTime = 0.0f
	Last time AI was used.
float	m_fAiDelayTime = 0.0f
	Time until AI next used.

Additional Inherited Members
Protected Attributes inherited from CObject
Sage::CSpriteDesc3D *	m_pSpriteDesc = nullptr
	Pointer to sprite descriptor.
Vector3	m_vVel = Vector3::Zero
	Velocity.
float	m_fRollSpeed = 0.0f
	Roll speed in revs per second.
float	m_fFrameTimer = 0.0f
	Last time the frame was changed.
float	m_fFrameInterval = 0.1f
	Interval between frames.
float	m_fBirthTime = 0.0f
	Time of creation.
float	m_fLifeTime = FLT_MAX
	Time that object lives.
Sage::CParticleEngine3D *	m_pParticleEngine = nullptr
	Pointer to a particle engine.
Static Protected Attributes inherited from CCommon
static CRenderer *	m_pRenderer = nullptr
	Pointer to the renderer.
static CObjectManager *	m_pObjectManager = nullptr
	Pointer to the object manager.
static CPlaneObject *	m_pPlayer = nullptr
	Pointer to player character.
static float	m_fWorldScale = 2.0f
	World scale.
static Vector3	m_vCellSize = Vector3::Zero
	Cell size.
static UINT	m_nNumCells = 3
	Number of cells.
static float	m_fWorldWidth = 0.0f
	World width.
static eDrawMode	m_eDrawMode = eDrawMode::Playing
	Draw mode.
static eGameState	m_eGameState = eGameState::Loading
	Game state.

Detailed Description

AI for the crow objects. Behaviour is based on a simple state machine with two states. State transitions involve an element of randomness. Crows change their speed and desired height at random, and randomly look for the plane. If the plane is close enough when they look, then they enter the avoiding state. If it's where it can't do them any harm, they go back to cruising.

Member Enumeration Documentation

eState

enum CCrowObject::eState

private

The crow is either cruising along happily or actively avoiding the player's plane.

Constructor & Destructor Documentation

CCrowObject()

CCrowObject::CCrowObject

(

const Vector3 &

pos

)

Create a crow moving at a fixed velocity, at a specified position, with that position clamped so that the top of the sprire doesn't go above m_fMaxAltitude and the bottom of the sprite doesn't go below m_fMinAltitude. This uses the height of the first frame of the crow animation by default, so it's best that all crow frames be the same size.

Parameters

pos	Initial position.

Member Function Documentation

AvoidingAi()

void CCrowObject::AvoidingAi ( )

private

These crows are trying to get away from the plane.

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CruisingAi()

void CCrowObject::CruisingAi ( )

private

These crows are just cruising along, periodically looking for the plane.

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Move()

void CCrowObject::Move ( )

virtual

Intelligent move function. Just move like a dumb object then modify private variables "intelligently".

Reimplemented from CObject.

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SetState()

void CCrowObject::SetState ( eState state )

private

Change the current state, taking whatever actions are necessary on entering the new state.

Parameters

state

New state

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Think()

void CCrowObject::Think ( )

private

The real work is done by a function for each state. This function merely calls the appropriate function for the current state periodically, based on a timer.

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