CloudObject Class Reference

#include <lib_cloud.h>

Inheritance diagram for CloudObject:

Detailed Description

Cloud object.

Private Member Functions

 CloudObject ()
 
 ~CloudObject ()
 

Alloc/Free

static CloudObjectAlloc ()
 
static void Free (CloudObject *&pObj)
 

Miscellaneous

static void SetDrawHook (CloudDrawFn fn)
 
void * GetPrivateData (CloudDataAllocator fnAlloc, ClodDataDeleter fnFree)
 

Size/Density

void GetSize (Vector &vSize)
 
void GetSize (Int32 &x, Int32 &y, Int32 &z)
 
UCharGetDensity ()
 
Int GetDensitySize ()
 
Bool Resize (Int32 x, Int32 y, Int32 z, Bool bResample)
 

Tool Data

UCharGetToolData ()
 
Bool AllocToolData ()
 
void FreeToolData ()
 

Altitude

Float GetAltitude (BaseObject *pCloudGroup)
 

Smooth/Clear/Fill

Bool SmoothBorders (Float rDist, Float rVariance, SplineData *pSpline)
 
Bool SmoothAll (Float rStrength, Float rVariance)
 
void Clear (UChar chDensity)
 
void FillPlane (Float rRadius, UChar chDensity)
 
void FillSphere (Float rRadius, UChar chDensity)
 

Visible/Lock

Bool IsVisible (Bool bEditor, Bool &bDrawBox, BaseObject *&pSkyObject, BaseObject **ppGroup=nullptr)
 
Bool IsLocked ()
 

Draw

void Draw (BaseDraw *pBaseDraw, BaseDrawHelp *pDrawHelp, Int32 lGrid, Float rQuality, Bool bDrawPlane)
 

Plane Index/Position

Int32 GetPlaneIndex ()
 
void SetPlaneIndex (Int32 lPlane)
 
Int32 GetPlanePosition ()
 
void SetPlanePosition (Int32 lPos)
 

Additional Inherited Members

- Public Member Functions inherited from BaseObject
const MatrixGetDeformMatrix () const
 
void SetDeformMatrix (const Matrix &dm)
 
void ClearDeformMatrix ()
 
const MatrixGetUndeformedMl () const
 
const MatrixGetUndeformedMlInverse () const
 
Matrix GetUndeformedMg () const
 
BaseObjectGetNext ()
 
const BaseObjectGetNext () const
 
BaseObjectGetPred ()
 
const BaseObjectGetPred () const
 
BaseObjectGetUp ()
 
const BaseObjectGetUp () const
 
BaseObjectGetDown ()
 
const BaseObjectGetDown () const
 
BaseObjectGetDownLast ()
 
const BaseObjectGetDownLast () const
 
Vector GetAbsPos () const
 
void SetAbsPos (const Vector &v)
 
Vector GetAbsScale () const
 
void SetAbsScale (const Vector &v)
 
Vector GetAbsRot () const
 
void SetAbsRot (const Vector &v)
 
Vector GetFrozenPos () const
 
void SetFrozenPos (const Vector &v)
 
Vector GetFrozenScale () const
 
void SetFrozenScale (const Vector &v)
 
Vector GetFrozenRot () const
 
void SetFrozenRot (const Vector &v)
 
Vector GetRelPos () const
 
void SetRelPos (const Vector &v)
 
Vector GetRelScale () const
 
void SetRelScale (const Vector &v)
 
Vector GetRelRot () const
 
void SetRelRot (const Vector &v)
 
const MatrixGetMl () const
 
void SetMl (const Matrix &m)
 
Matrix GetFrozenMln () const
 
Matrix GetRelMln () const
 
Matrix GetRelMl () const
 
void SetRelMl (const Matrix &m)
 
Matrix GetMg () const
 
void SetMg (const Matrix &m)
 
Matrix GetMln () const
 
Matrix GetMgn () const
 
Matrix GetUpMg () const
 
void CopyMatrixTo (BaseObject *dst) const
 
Vector GetMp () const
 
Vector GetRad () const
 
void GetDimension (Vector &mp, Vector &rad) const
 
Int32 GetEditorMode () const
 
Int32 GetEditorModeH () const
 
void SetEditorMode (Int32 mode)
 
Int32 GetRenderMode () const
 
Int32 GetRenderModeH () const
 
void SetRenderMode (Int32 mode)
 
Bool GetDeformMode () const
 
void SetDeformMode (Bool mode)
 
Int32 GetRealDeformMode () const
 
void SetRealDeformMode (Int32 mode)
 
Int32 GetUniqueIP () const
 
void SetUniqueIP (Int32 ip)
 
BaseTagGetFirstTag ()
 
const BaseTagGetFirstTag () const
 
BaseTagGetLastTag ()
 
const BaseTagGetLastTag () const
 
BaseTagGetTag (Int32 type, Int32 nr=0)
 
const BaseTagGetTag (Int32 type, Int32 nr=0) const
 
maxon::Block< const BaseTag *const > GetTagsOfType (Int32 type) const
 
maxon::Block< BaseTag *const > GetTagsOfType (Int32 type)
 
const void * GetTagDataR (Int32 type, Int32 nr=0) const
 
void * GetTagDataW (Int32 type, Int32 nr=0)
 
Int32 GetTagDataCount (Int32 type) const
 
BaseTagMakeTag (Int32 type, BaseTag *pred=nullptr)
 
VariableTagMakeVariableTag (Int32 type, Int32 count, BaseTag *pred=nullptr)
 
void InsertTag (BaseTag *tp, BaseTag *pred=nullptr)
 
void KillTag (Int32 type, Int32 nr=0)
 
Bool CopyTagsTo (BaseObject *dest, Int32 visible, Int32 variable, Int32 hierarchical, AliasTrans *trans) const
 
BaseObjectGetCache ()
 
const BaseObjectGetCache () const
 
BaseObjectGetDeformCache ()
 
const BaseObjectGetDeformCache () const
 
LineObjectGetIsoparm ()
 
void SetIsoparm (LineObject *l)
 
BaseObjectGetCacheParent () const
 
BaseObjectGetCacheTopParent () const
 
Bool SetPhong (Bool on, Bool anglelimit, Float angle)
 
Bool IsDirty (DIRTYFLAGS flags) const
 
void SetDirty (DIRTYFLAGS flags)
 
Bool CheckCache (const HierarchyHelp *hh) const
 
void Touch ()
 
void GetColorProperties (ObjectColorProperties *prop) const
 
void SetColorProperties (ObjectColorProperties *prop)
 
maxon::Opt< maxon::ColorGetDisplayColor () const
 
const MatrixGetModelingAxis (BaseDocument *doc)
 
void SetModelingAxis (const Matrix &m)
 
BaseObjectGetAndCheckHierarchyClone (const HierarchyHelp *hh, BaseObject *op, HIERARCHYCLONEFLAGS flags, Bool *dirty, AliasTrans *trans, Int childCount, maxon::BaseArray< BaseObject * > *children, Bool addChildOrClone=false)
 
BaseObjectGetAndCheckHierarchyClone (const HierarchyHelp *hh, BaseObject *op, HIERARCHYCLONEFLAGS flags, Bool *dirty, AliasTrans *trans, Bool allchildren)
 
BaseObjectGetHierarchyClone (const HierarchyHelp *hh, BaseObject *op, HIERARCHYCLONEFLAGS flags, Bool *dirty, AliasTrans *trans)
 
BaseObjectGetHierarchyClone (const HierarchyHelp *hh, BaseObject *op, HIERARCHYCLONEFLAGS flags, Bool *dirty, AliasTrans *trans, DIRTYFLAGS dirtyflags)
 
void NewDependenceList ()
 
Bool CompareDependenceList ()
 
void AddDependence (const BaseObject *op)
 
void AddDependence (const BaseObject *op, DIRTYFLAGS dirtyflags)
 
void TouchDependenceList ()
 
void SetRotationOrder (ROTATIONORDER order)
 
ROTATIONORDER GetRotationOrder () const
 
void SetQuaternionRotationMode (Bool active, Bool bUndo)
 
Bool IsQuaternionRotationMode ()
 
Bool SynchronizeVectorTrackKeys (Int32 vectorTrackID, Bool bUndo, BaseTime startRange=BaseTime(-108000, 1), BaseTime endRange=BaseTime(108000, 1))
 
Bool FindBestEulerAngle (Int32 rotationTrackID, Bool bAdjustTangent, Bool bUndo, BaseTime startRange=BaseTime(-108000, 1), BaseTime endRange=BaseTime(108000, 1))
 
Bool EvaluateSynchronizedRotation (const BaseTime &time, ANIMATEFLAGS flags, Vector *resultRotation=nullptr)
 
Bool GetVectorTracks (const DescID &id, CTrack *&xfound, CTrack *&yfound, CTrack *&zfound)
 
Bool GetVectorCurves (CCurve *curveToSearch, CCurve *&xfound, CCurve *&yfound, CCurve *&zfound)
 
UInt64 GetGUID ()
 
Int32 GetHighlightHandle (BaseDraw *bd)
 
SplineObjectGetRealSpline ()
 
const SplineObjectGetRealSpline () const
 
Float GetVisibility (Float parent) const
 
Bool SearchHierarchy (const BaseObject *op) const
 
BaseObjectGetOrigin (Bool safe)
 
const BaseObjectGetOrigin (Bool safe) const
 
void SetOrigin (BaseObject *origin)
 
BaseObjectGetTopOrigin (Bool parent, Bool safe) const
 
BaseObjectGetEditObject (BaseObject **psds, DISPLAYEDITSTATE state, Bool safetey=true) const
 
void RemoveFromCache (Bool clearParentObject=true)
 
DRAWRESULT ObjDraw (DRAWPASS drawpass, BaseDraw *bd, BaseDrawHelp *bh)
 
maxon::Tuple< Bool, maxon::HashIntGetObjectDrawHash (Int32 type) const
 
void GetDrawStateData (void *state) const
 
- Public Member Functions inherited from BaseList2D
void SetBit (Int32 mask)
 
Bool GetBit (Int32 mask) const
 
void DelBit (Int32 mask)
 
void ToggleBit (Int32 mask)
 
Int32 GetAllBits () const
 
void SetAllBits (Int32 bits)
 
void SetBitEx (Int32 mask, Int32 flags)
 
const CharGetViewportRenderId (VIEWPORT_RENDER_ID typeId) const
 
BaseList2DGetNext ()
 
const BaseList2DGetNext () const
 
BaseList2DGetPred ()
 
const BaseList2DGetPred () const
 
BaseContainer GetData ()
 
void SetData (const BaseContainer &bc, Bool add=true)
 
const BaseContainerGetDataInstanceRef () const
 
BaseContainerGetDataInstanceRef ()
 
const BaseContainerGetDataInstance () const
 
BaseContainerGetDataInstance ()
 
String GetName () const
 
void SetName (const maxon::String &name, Bool setDirty=true)
 
String GetBubbleHelp ()
 
Bool TransferGoal (BaseList2D *dst, Bool undolink)
 
Bool TransferMarker (BaseList2D *dst) const
 
Bool CopyDynamicDescriptionFrom (const BaseList2D *src)
 
Bool Scale (Float scale)
 
Bool Edit ()
 
void GetIcon (IconData *dat)
 
GeListHeadGetNLARoot (Bool create)
 
BaseList2DAnimationLayerRemap (BaseObject **layer=nullptr)
 
String GetTypeName () const
 
BaseList2DGetMain () const
 
void InsertTrackSorted (CTrack *track)
 
Bool AddEventNotification (BaseList2D *bl, NOTIFY_EVENT eventid, NOTIFY_EVENT_FLAG flags, const BaseContainer *data)
 
Bool RemoveEventNotification (const BaseDocument *doc, BaseList2D *bl, NOTIFY_EVENT eventid)
 
Bool FindEventNotification (const BaseDocument *doc, BaseList2D *bl, NOTIFY_EVENT eventid)
 
Bool SetDescIDState (const DescID &id, DESCIDSTATE descidstate)
 
DESCIDSTATE GetDescIDState (const DescID &id, Bool tolerant) const
 
GeListHeadGetOverrideRoot (Bool create)
 
BaseOverrideGetFirstOverride ()
 
GeListHeadGetShaderRepositoryRoot (Bool create)
 
GeListHeadGetHiddenShaderRoot (Bool create)
 
maxon::NimbusForwardRef GetNimbusRef (const maxon::Id &spaceId) const
 
maxon::Result< maxon::NimbusForwardRefPrivateGetOrCreateNimbusRef (const maxon::Id &spaceId)
 
void RemoveNimbusRef (const maxon::Id &spaceId)
 
maxon::Result< maxon::HashMap< maxon::Id, maxon::NimbusForwardRef > > GetAllNimbusRefs () const
 
Bool IsNodeBased () const
 
maxon::Result< BoolGetAccessedObjects (METHOD_ID method, AccessedObjectsCallback &access) const
 
maxon::Result< BoolGetAccessedObjectsRec (ACCESSED_OBJECTS_MASK read, ACCESSED_OBJECTS_MASK write, METHOD_ID method, Bool withSiblings, Bool withChildren, AccessedObjectsCallback &access) const
 
maxon::Result< BoolGetAccessedObjectsOfHierarchy (ACCESSED_OBJECTS_MASK read, ACCESSED_OBJECTS_MASK write, METHOD_ID method, AccessedObjectsCallback &access) const
 
maxon::Result< BoolGetAccessedObjectsOfChildren (ACCESSED_OBJECTS_MASK read, ACCESSED_OBJECTS_MASK write, METHOD_ID method, AccessedObjectsCallback &access) const
 
maxon::Result< BoolGetAccessedObjectsOfFirstChildHierarchy (ACCESSED_OBJECTS_MASK read, ACCESSED_OBJECTS_MASK write, METHOD_ID method, AccessedObjectsCallback &access) const
 
maxon::Result< maxon::GenericDataGroupChanges ()
 
void GetMarkerStampEx (UInt32 *l1, UInt32 *l2)
 
const GeMarkerGetMarker () const
 
void SetMarker (const GeMarker &m)
 
Bool AddUniqueID (Int32 appid, const Char *const mem, Int bytes)
 
Bool FindUniqueID (Int32 appid, const Char *&mem, Int &bytes) const
 
Int32 GetUniqueIDCount () const
 
Bool GetUniqueIDIndex (Int32 idx, Int32 &id, const Char *&mem, Int &bytes) const
 
Bool SetAnimatedParameter (const CTrack *track, const DescID &id, const GeData &t_data1, const GeData &t_data2, Float mix, DESCFLAGS_SET flags)
 
Bool GetAnimatedParameter (const DescID &id, GeData &t_data1, GeData &t_data2, Float &mix, DESCFLAGS_GET flags) const
 
BaseShaderGetFirstShader () const
 
void InsertShader (BaseShader *shader, BaseShader *pred=nullptr)
 
void ClearKeyframeSelection ()
 
Bool FindKeyframeSelection (const DescID &id)
 
Bool SetKeyframeSelection (const DescID &id, Bool selection)
 
Bool KeyframeSelectionContent ()
 
LayerObjectGetLayerObject (const BaseDocument *doc)
 
const LayerObjectGetLayerObject (const BaseDocument *doc) const
 
Bool SetLayerObject (const LayerObject *layer)
 
const LayerDataGetLayerData (const BaseDocument *doc, Bool rawdata=false) const
 
Bool SetLayerData (BaseDocument *doc, const LayerData &data)
 
GeListHeadGetCTrackRoot (Bool create)
 
const GeListHeadGetCTrackRoot () const
 
CTrackGetFirstCTrack ()
 
const CTrackGetFirstCTrack () const
 
CTrackFindCTrack (const DescID &id)
 
const CTrackFindCTrack (const DescID &id) const
 
- Public Member Functions inherited from GeListNode
GeListNodeGetNext ()
 
const GeListNodeGetNext () const
 
GeListNodeGetPred ()
 
const GeListNodeGetPred () const
 
GeListNodeGetDown ()
 
const GeListNodeGetDown () const
 
GeListNodeGetUp ()
 
const GeListNodeGetUp () const
 
GeListNodeGetDownLast ()
 
const GeListNodeGetDownLast () const
 
void InsertBefore (GeListNode *bl)
 
void InsertAfter (GeListNode *bl)
 
void InsertUnder (GeListNode *bl)
 
void InsertUnderLast (GeListNode *bl)
 
void Remove ()
 
void FlushChilds ()
 
void MoveChildrenTo (GeListNode *dest)
 
GeListHeadGetListHead ()
 
const GeListHeadGetListHead () const
 
Int32 GetNodeID (Int32 index=0) const
 
template<typename CAST >
const CAST * GetNodeData (Int32 index=0) const
 
template<typename CAST >
CAST * GetNodeData (Int32 index=0)
 
void SetCustomData (GeListNode *node)
 
GeListNodeGetCustomData ()
 
const GeListNodeGetCustomData () const
 
const BaseDocumentGetDocument () const
 
BaseDocumentGetDocument ()
 
maxon::Result< BoolGetBranchInfo (const maxon::ValueReceiver< const BranchInfo & > &info, GETBRANCHINFO flags) const
 
Bool IsDocumentRelated () const
 
Int32 GetInfo () const
 
Bool GetNBit (NBIT bit) const
 
UInt32 GetNBitMask (Int32 index) const
 
Bool ChangeNBit (NBIT bit, NBITCONTROL bitmode)
 
- Public Member Functions inherited from C4DAtom
Int32 GetType () const
 
Int32 GetRealType () const
 
Int32 GetDiskType () const
 
Bool IsInstanceOf (Int32 id) const
 
Int32 GetClassification () const
 
Bool Message (Int32 type, void *data=nullptr)
 
Bool MultiMessage (MULTIMSG_ROUTE flags, Int32 type, void *data)
 
C4DAtomGetClone (COPYFLAGS flags, AliasTrans *trn) const
 
Bool CopyTo (C4DAtom *dst, COPYFLAGS flags, AliasTrans *trn) const
 
Bool Read (HyperFile *hf, Int32 id, Int32 level)
 
Bool Write (HyperFile *hf) const
 
Bool ReadObject (HyperFile *hf, Bool readheader)
 
Bool WriteObject (HyperFile *hf) const
 
Bool GetDescription (Description *description, DESCFLAGS_DESC flags) const
 
Bool GetParameter (const DescID &id, GeData &t_data, DESCFLAGS_GET flags) const
 
Bool SetParameter (const DescID &id, const GeData &t_data, DESCFLAGS_SET flags)
 
DynamicDescriptionGetDynamicDescriptionWritable ()
 
const DynamicDescriptionGetDynamicDescription () const
 
Bool CopyDynamicDescriptionFrom (const BaseList2D *src)
 
Bool GetEnabling (const DescID &id, const GeData &t_data, DESCFLAGS_ENABLE flags, const BaseContainer *itemdesc) const
 
Bool TranslateDescID (const DescID &id, DescID &res_id, C4DAtom *&res_at)
 
UInt32 GetDirty (DIRTYFLAGS flags) const
 
void SetDirty (DIRTYFLAGS flags)
 
UInt32 GetHDirty (HDIRTYFLAGS mask) const
 
void SetHDirty (HDIRTYFLAGS mask)
 
- Static Public Member Functions inherited from BaseObject
static BaseObjectAlloc (Int32 type)
 
static void Free (BaseObject *&bl)
 
- Static Public Member Functions inherited from BaseList2D
static BaseList2DAlloc (Int32 type)
 
static void Free (BaseList2D *&bl)
 
- Static Public Attributes inherited from BaseList2D
static const Int32 SETBIT_FLAG_NODIRTY
 
static const Int32 SETBIT_FLAG_REMOVE
 

Constructor & Destructor Documentation

◆ CloudObject()

CloudObject ( )
private

◆ ~CloudObject()

~CloudObject ( )
private

Member Function Documentation

◆ Alloc()

static CloudObject* Alloc ( )
static

Allocates a cloud object. Destroy the allocated cloud object with Free(). Use AutoAlloc to automate the allocation and destruction based on scope.

Returns
The allocated cloud object, or nullptr if the allocation failed.

◆ Free()

static void Free ( CloudObject *&  pObj)
static

Destructs cloud objects allocated with Alloc(). Use AutoAlloc to automate the allocation and destruction based on scope.

Parameters
[in,out]pObjThe cloud object to destruct. If the pointer is nullptr nothing happens. The pointer is assigned nullptr afterwards.

◆ GetSize() [1/2]

void GetSize ( Vector vSize)

Retrieves the size in the vector vSize.

Parameters
[out]vSizeThe size.

◆ GetSize() [2/2]

void GetSize ( Int32 x,
Int32 y,
Int32 z 
)

Retrieves the grid size.

Note
The cloud has (x + 1) * (y + 1) * (z + 1) grid points.
Parameters
[out]xAssigned the X size.
[out]yAssigned the Y size.
[out]zAssigned the Z size.

◆ GetDensity()

UChar* GetDensity ( )

Gets the density array.

Returns
The density array.

◆ GetDensitySize()

Int GetDensitySize ( )

Gets the density size.

Returns
The density size.

◆ Resize()

Bool Resize ( Int32  x,
Int32  y,
Int32  z,
Bool  bResample 
)

Resizes the cloud object.

Parameters
[in]xThe new X size.
[in]yThe new Y size.
[in]zThe new Z size.
[in]bResampleIf true the cloud data is resampled.
Returns
true if successful, otherwise false.

◆ GetToolData()

UChar* GetToolData ( )

Gets the tool data.

Returns
The tool data.

◆ AllocToolData()

Bool AllocToolData ( )

Allocates the tool data.

Returns
true if successful, otherwise false.

◆ FreeToolData()

void FreeToolData ( )

Frees the tool data.

◆ GetAltitude()

Float GetAltitude ( BaseObject pCloudGroup)

Gets the altitude of a cloud group.

Parameters
[in]pCloudGroupThe cloud group object. The caller owns the pointed object.
Returns
The altitude.

◆ SmoothBorders()

Bool SmoothBorders ( Float  rDist,
Float  rVariance,
SplineData pSpline 
)

Smooths borders.

Parameters
[in]rDistThe distance.
[in]rVarianceThe variance.
[in]pSplineThe spline to smooth along.
Returns
true if successful, otherwise false.

◆ SmoothAll()

Bool SmoothAll ( Float  rStrength,
Float  rVariance 
)

Smooths all of the cloud object.

Parameters
[in]rStrengthThe strength.
[in]rVarianceThe variance.
Returns
true if successful, otherwise false.

◆ Clear()

void Clear ( UChar  chDensity)

Clears the cloud object to chDensity.

Parameters
[in]chDensityThe clear density.

◆ FillPlane()

void FillPlane ( Float  rRadius,
UChar  chDensity 
)

Fills the plane.

Parameters
[in]rRadiusThe radius.
[in]chDensityThe density.

◆ FillSphere()

void FillSphere ( Float  rRadius,
UChar  chDensity 
)

Fills a sphere.

Parameters
[in]rRadiusThe radius.
[in]chDensityThe density.

◆ IsVisible()

Bool IsVisible ( Bool  bEditor,
Bool bDrawBox,
BaseObject *&  pSkyObject,
BaseObject **  ppGroup = nullptr 
)

Checks for visibility.

Parameters
[in]bEditorThe editor mode.
[out]bDrawBoxAssigned the draw box visibility.
[out]pSkyObjectAssigned the sky object.
[in]ppGroupOptional array of cloud groups.
Returns
true if visible, otherwise false.

◆ IsLocked()

Bool IsLocked ( )

Checks if the cloud object is locked.

Returns
true if the cloud object is locked, otherwise false.

◆ Draw()

void Draw ( BaseDraw pBaseDraw,
BaseDrawHelp pDrawHelp,
Int32  lGrid,
Float  rQuality,
Bool  bDrawPlane 
)

Draws the cloud object.

Parameters
[in]pBaseDrawThe draw view.
[in]pDrawHelpThe draw helper.
[in]lGridThe grid size.
[in]rQualityThe quality.
[in]bDrawPlaneThe draw plane option.

◆ GetPlaneIndex()

Int32 GetPlaneIndex ( )

Gets the plane index.

Returns
The plane index.

◆ SetPlaneIndex()

void SetPlaneIndex ( Int32  lPlane)

Sets the plane index.

Parameters
[in]lPlaneThe new plane index.

◆ GetPlanePosition()

Int32 GetPlanePosition ( )

Gets the plane position.

Returns
The plane position.

◆ SetPlanePosition()

void SetPlanePosition ( Int32  lPos)

Sets the plane position.

Parameters
[in]lPosThe new plane position.

◆ GetPrivateData()

void* GetPrivateData ( CloudDataAllocator  fnAlloc,
ClodDataDeleter  fnFree 
)

Retrieves the cloud private data.

Parameters
[in]fnAllocThe data allocator hook.
[in]fnFreeThe data deleter hook.
Returns
The private data.

◆ SetDrawHook()

static void SetDrawHook ( CloudDrawFn  fn)
static

Sets the cloud draw hook.

Parameters
[in]fnThe draw hook.