FloodPathTracer Class Reference

Traces a path created with the Pathfinding.FloodPath. More...

Detailed Description

Traces a path created with the Pathfinding.FloodPath.

See Pathfinding.FloodPath for examples on how to use this path type

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
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Public Member Functions
	FloodPathTracer ()
	Default constructor.
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	Reset ()
	Reset all values to their default values.
void	Trace (GraphNode from)
	Traces the calculated path from the start node to the end.
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.
override void	Prepare ()
	Prepares 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)
bool	CanTraverse (GraphNode node)
	Returns if the node can be traversed.
void	Claim (System.Object o)
	Claim this path.
void	Error ()
	Aborts the path because of an error.
void	ForceLogError (string msg)
	Logs an error and calls 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.
void	Log (string msg)
	Appends a message to the errorLog.
void	LogError (string msg)
	Appends msg to errorLog and logs msg to the console.
virtual void	OnEnterPool ()
	Called when the path enters the pool.
void	PrepareBase (PathHandler pathHandler)
	Prepares low level path variables for calculation.
void	Release (System.Object o)
	Releases a path claim.
void	ReleaseSilent (System.Object o)
	Releases the path silently.
virtual void	ReturnPath ()
	Calls callback to return the calculated path.
IEnumerator	WaitForPath ()
	Waits until this path has been calculated and returned.

Static Public Member Functions
static FloodPathTracer	Construct (Vector3 start, FloodPath flood, 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
override void	Recycle ()
	Internal method to recycle the path.
void	Setup (Vector3 start, FloodPath flood, 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.
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
bool	HasExceededTime (int searchedNodes, long targetTime)
virtual void	Trace (PathNode from)
	Traces the calculated path from the end node to the start.

Protected Attributes
FloodPath	flood
	Reference to the FloodPath which searched the path originally.
Protected Attributes inherited from ABPath
int[]	endNodeCosts
	Saved original costs for the end node.
PathNode	partialBestTarget
	Current best target for the partial path.
Protected Attributes inherited from Path
PathNode	currentR
	The node currently being processed.
bool	hasBeenReset
	True if the Reset function has been called.
Int3	hTarget
	Target to use for H score calculations.
GraphNode	hTargetNode
	Target to use for H score calculation.
int[]	internalTagPenalties
	The tag penalties that are actually used.
int[]	manualTagPenalties
	Tag penalties set by other scripts.
float	maxFrameTime
	The max number of milliseconds per iteration (frame, in case of non-multithreading)

Properties
override bool	hasEndPoint [get]
Properties inherited from ABPath
virtual bool	hasEndPoint [get]
	Determines if a search for an end node should be done.
Properties inherited from Path
System.DateTime	callTime [get, set]
	When the call was made to start the pathfinding for this path.
PathCompleteState	CompleteState [get, set]
	Current state of the path.
bool	error [get]
	If the path failed, this is true.
string	errorLog [get]
	Log messages with info about eventual errors.
virtual bool	FloodingPath [get]
	True for paths that want to search all nodes and not jump over nodes as optimizations.
PathHandler	pathHandler [get, set]
	Data for the thread calculating this path.
ushort	pathID [get, set]
	ID of this path.
int[]	tagPenalties [get, set]
	Penalties for each tag.

Additional Inherited Members
Public Attributes inherited from ABPath
bool	calculatePartial
	Calculate partial path if the target node cannot be reached.
GraphNode	endHint
	Hints can be set to enable faster Get Nearest Node queries.
GraphNode	endNode
	End node of the path.
Vector3	endPoint
	Exact end point of the path.
Vector3	originalEndPoint
	End Point exactly as in the path request.
Vector3	originalStartPoint
	Start Point exactly as in the path request.
bool	recalcStartEndCosts = true
	Defines if start and end nodes will have their connection costs recalculated for this path.
GraphNode	startHint
	Hints can be set to enable faster Get Nearest Node queries.
Int3	startIntPoint
	Start point in integer coordinates.
GraphNode	startNode
	Start node of the path.
Vector3	startPoint
	Exact start point of the path.
Package Attributes inherited from Path
Path	next
	Internal linked list implementation.
bool	recycled
	True if the path is currently recycled (i.e in the path pool).

Constructor & Destructor Documentation

FloodPathTracer

(

)

Default constructor.

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

Member Function Documentation

override void CalculateStep ( long  targetTick )

virtual

Calculates the path until completed or until the time has passed targetTick.

Usually a check is only done every 500 nodes if the time has passed targetTick. Time/Ticks are got from System.DateTime.UtcNow.Ticks.

Basic outline of what the function does for the standard path (Pathfinding.ABPath).

while the end has not been found and no error has ocurred
    check if we have reached the end
        if so, exit and return the path

    open the current node, i.e loop through its neighbours, mark them as visited and put them on a heap

    check if there are still nodes left to process (or have we searched the whole graph)
        if there are none, flag error and exit

    pop the next node of the heap and set it as current

    check if the function has exceeded the time limit
        if so, return and wait for the function to get called again

Reimplemented from ABPath.

static FloodPathTracer Construct ( Vector3  start, FloodPath  flood, OnPathDelegate  callback = null  )

static

override void Initialize ( )

virtual

Initializes the path.

Traces the path from the start node.

Reimplemented from ABPath.

override void Recycle ( )

protectedvirtual

Internal method to recycle the path.

Calling this means that the path and any variables on it are not needed anymore and the path can be pooled. All path data will be reset. Implement this in inheriting path types to support recycling of paths.

public override void Recycle () {
    //Recycle the Path (<Path> should be replaced by the path type it is implemented in)
    PathPool<Path>.Recycle (this);
}

Warning

Do not call this function directly, instead use the Claim and Release functions.

See Also

Pathfinding.PathPool

Reset

Claim

Release

Reimplemented from ABPath.

override void Reset ( )

virtual

Reset all values to their default values.

All inheriting path types must implement this function, resetting ALL their variables to enable recycling of paths. Call this base function in inheriting types with base.Reset ();

Reimplemented from ABPath.

void Setup ( Vector3  start, FloodPath  flood, OnPathDelegate  callback  )

protected

void Trace

(

GraphNode

from

)

Traces the calculated path from the start node to the end.

This will build an array (path) of the nodes this path will pass through and also set the vectorPath array to the path arrays positions. This implementation will use the flood (FloodPath) to trace the path from precalculated data.

Member Data Documentation

FloodPath flood

protected

Reference to the FloodPath which searched the path originally.

Property Documentation

override bool hasEndPoint

getprotected

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

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