FleePath Class Reference

Returns a path heading away from a specified point to avoid. More...

Detailed Description

Returns a path heading away from a specified point to avoid.

The search will terminate when G > length (passed to the constructor) + FleePath.spread.

Can be used to make an AI to flee from an enemy (cannot guarantee that it will not be forced into corners though :D )

// Call a FleePath call like this, assumes that a Seeker is attached to the GameObject
Vector3 thePointToFleeFrom = Vector3.zero;

// The path will be returned when the path is over a specified length (or more accurately when the traversal cost is greater than a specified value).
// A score of 1000 is approximately equal to the cost of moving one world unit.
int theGScoreToStopAt = 10000;

// Create a path object
FleePath path = FleePath.Construct (transform.position, thePointToFleeFrom, theGScoreToStopAt);
// This is how strongly it will try to flee, if you set it to 0 it will behave like a RandomPath
path.aimStrength = 1;
// Determines the variation in path length that is allowed
path.spread = 4000;

// Get the Seeker component which must be attached to this GameObject
Seeker seeker = GetComponent<Seeker>();

// Start the path and return the result to MyCompleteFunction (which is a function you have to define, the name can of course be changed)
seeker.StartPath(path, MyCompleteFunction);

A* Pro Feature:

This is an A* Pathfinding Project Pro feature only. This function/class/variable might not exist in the Free version of the A* Pathfinding Project or the functionality might be limited
The Pro version can be bought here

Public Member Functions
	FleePath ()
	Default constructor.
Public Member Functions inherited from RandomPath
	RandomPath ()
	RandomPath (Vector3 start, int length, OnPathDelegate callback=null)
override void	CalculateStep (long targetTick)
	Calculates the path until completed or until the time has passed targetTick.
override void	Initialize ()
	Initializes the path.
override void	Prepare ()
	Prepares the path.
override void	Reset ()
	Reset all values to their default values.
override void	ReturnPath ()
	Calls callback to return the calculated path.
Public Member Functions inherited from ABPath
override void	Cleanup ()
	Always called after the path has been calculated.
override string	DebugString (PathLog logMode)
	Returns a debug string for this path.
override uint	GetConnectionSpecialCost (GraphNode a, GraphNode b, uint currentCost)
	May be called by graph nodes to get a special cost for some connections.
Vector3	GetMovementVector (Vector3 point)
	Returns in which direction to move from a point on the path.
void	ResetCosts (Path p)
	Resets End Node Costs.
	ABPath ()
	Default constructor.
Public Member Functions inherited from Path
void	AdvanceState (PathState s)
	Threadsafe increment of the state.
uint	CalculateHScore (GraphNode node)
	Estimated cost from the specified node to the target.
bool	CanTraverse (GraphNode node)
	Returns if the node can be traversed.
void	Claim (System.Object o)
	Claim this path (pooling).
void	Error ()
	Aborts the path because of an error.
Int3	GetHTarget ()
PathState	GetState ()
	Returns the state of the path in the pathfinding pipeline.
uint	GetTagPenalty (int tag)
	Returns penalty for the given tag.
float	GetTotalLength ()
	Total Length of the path.
uint	GetTraversalCost (GraphNode node)
bool	IsDone ()
	Returns if this path is done calculating.
virtual void	OnEnterPool ()
	Called when the path enters the pool.
void	Release (System.Object o, bool silent=false)
	Releases a path claim (pooling).
void	ReleaseSilent (System.Object o)
	Releases the path silently (pooling).
IEnumerator	WaitForPath ()
	Waits until this path has been calculated and returned.

Static Public Member Functions
static FleePath	Construct (Vector3 start, Vector3 avoid, int searchLength, OnPathDelegate callback=null)
	Constructs a new FleePath.
Static Public Member Functions inherited from RandomPath
static RandomPath	Construct (Vector3 start, int length, OnPathDelegate callback=null)
Static Public Member Functions inherited from ABPath
static ABPath	Construct (Vector3 start, Vector3 end, OnPathDelegate callback=null)
	Construct a path with a start and end point.

Protected Member Functions
void	Setup (Vector3 start, Vector3 avoid, int searchLength, OnPathDelegate callback)
Protected Member Functions inherited from RandomPath
RandomPath	Setup (Vector3 start, int length, OnPathDelegate callback)
Protected Member Functions inherited from ABPath
virtual void	CompletePathIfStartIsValidTarget ()
	Checks if the start node is the target and complete the path if that is the case.
virtual bool	EndPointGridGraphSpecialCase (GraphNode closestWalkableEndNode)
	Applies a special case for grid nodes.
void	UpdateStartEnd (Vector3 start, Vector3 end)
	Sets the start and end points.
void	Setup (Vector3 start, Vector3 end, OnPathDelegate callbackDelegate)
Protected Member Functions inherited from Path
void	DebugStringPrefix (PathLog logMode, System.Text.StringBuilder text)
	Writes text shared for all overrides of DebugString to the string builder.
void	DebugStringSuffix (PathLog logMode, System.Text.StringBuilder text)
	Writes text shared for all overrides of DebugString to the string builder.
bool	HasExceededTime (int searchedNodes, long targetTime)
virtual void	Trace (PathNode from)
	Traces the calculated path from the end node to the start.

Additional Inherited Members
Public Attributes inherited from RandomPath
Vector3	aim
	An aim can be used to guide the pathfinder to not take totally random paths.
float	aimStrength
	If an aim is set, the higher this value is, the more it will try to reach aim.
int	searchLength
	G score to stop searching at.
int	spread = 5000
	All G scores between searchLength and searchLength+spread are valid end points, a random one of them is chosen as the final point.
Protected Attributes inherited from ABPath
int[]	endNodeCosts
	Saved original costs for the end node.
PathNode	partialBestTarget
	Current best target for the partial path.
Package Functions inherited from Path
void	ForceLogError (string msg)
	Logs an error and calls Error().
void	Log (string msg)
	Appends a message to the errorLog.
void	LogError (string msg)
	Appends msg to errorLog and logs msg to the console.
void	PrepareBase (PathHandler pathHandler)
	Prepares low level path variables for calculation.
Package Attributes inherited from Path
Path	next
	Internal linked list implementation.
bool	pooled
	True if the path is currently pooled.
Properties inherited from RandomPath
override bool	FloodingPath [get]
override bool	hasEndPoint [get]

Constructor & Destructor Documentation

FleePath

(

)

Default constructor.

Do not use this. Instead use the static Construct method which can handle path pooling.

Member Function Documentation

static FleePath Construct ( Vector3  start, Vector3  avoid, int  searchLength, OnPathDelegate  callback = null  )

static

Constructs a new FleePath.

The FleePath will be taken from a pool.

void Setup ( Vector3  start, Vector3  avoid, int  searchLength, OnPathDelegate  callback  )

protected

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The documentation for this class was generated from the following file:

• /Users/arong/Unity/a-pathfinding-project/Assets/AstarPathfindingProject/Pathfinders/FleePath.cs