vtkAbstractPicker Class Reference

#include <vtkAbstractPicker.h>

Inheritance diagram for vtkAbstractPicker:

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Collaboration diagram for vtkAbstractPicker:

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List of all members.

Detailed Description

define API for picking subclasses

vtkAbstractPicker is an abstract superclass that defines a minimal API for its concrete subclasses. The minimum functionality of a picker is to return the x-y-z global coordinate position of a pick (the pick itself is defined in display coordinates).

The API to this class is to invoke the Pick() method with a selection point (in display coordinates - pixels) and a renderer. Then get the resulting pick position in global coordinates with the GetPickPosition() method.

vtkPicker fires events during the picking process. These events are StartPickEvent, PickEvent, and EndPickEvent which are invoked prior to picking, when something is picked, and after all picking candidates have been tested. Note that during the pick process the PickEvent of vtkProp (and its subclasses such as vtkActor) is fired prior to the PickEvent of vtkPicker.

Warning:: vtkAbstractPicker and its subclasses will not pick props that are "unpickable" (see vtkProp) or are fully transparent (if transparency is a property of the vtkProp).
There are two classes of pickers: those that pick using geometric methods (typically a ray cast); and those that use rendering hardware. Geometric methods return more information but are slower. Hardware methods are much faster and return minimal information. Examples of geometric pickers include vtkPicker, vtkCellPicker, and vtkPointPicker. Examples of hardware pickers include vtkWorldPointPicker and vtkPropPicker.

See also:: vtkPropPicker uses hardware acceleration to pick an instance of vtkProp. (This means that 2D and 3D props can be picked, and it's relatively fast.) If you need to pick cells or points, you might wish to use vtkCellPicker or vtkPointPicker. vtkWorldPointPicker is the fastest picker, returning an x-y-z coordinate value using the hardware z-buffer. vtkPicker can be used to pick the bounding box of 3D props.

Definition at line 66 of file vtkAbstractPicker.h.


Public Types
typedef vtkObject	Superclass
Public Member Functions
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
void	InitializePickList ()
void	AddPickList (vtkProp *)
void	DeletePickList (vtkProp *)
vtkPropCollection *	GetPickList ()

virtual vtkRenderer *	GetRenderer ()

virtual double *	GetSelectionPoint ()
virtual void	GetSelectionPoint (double data[3])

virtual double *	GetPickPosition ()
virtual void	GetPickPosition (double data[3])

virtual int	Pick (double selectionX, double selectionY, double selectionZ, vtkRenderer *renderer)=0

int	Pick (double selectionPt[3], vtkRenderer *ren)

virtual void	SetPickFromList (int)
virtual int	GetPickFromList ()
virtual void	PickFromListOn ()
virtual void	PickFromListOff ()
Static Public Member Functions
static int	IsTypeOf (const char *type)
static vtkAbstractPicker *	SafeDownCast (vtkObject *o)
Protected Member Functions
	vtkAbstractPicker ()
	~vtkAbstractPicker ()
virtual void	Initialize ()
Protected Attributes
vtkRenderer *	Renderer
double	SelectionPoint [3]
double	PickPosition [3]
int	PickFromList
vtkPropCollection *	PickList

Member Typedef Documentation

typedef vtkObject vtkAbstractPicker::Superclass

Reimplemented from vtkObject.

Reimplemented in vtkAbstractPropPicker, vtkAreaPicker, vtkCellPicker, vtkPicker, vtkPointPicker, vtkPropPicker, vtkRenderedAreaPicker, vtkWorldPointPicker, and vtkVolumePicker.

Definition at line 69 of file vtkAbstractPicker.h.

Constructor & Destructor Documentation

vtkAbstractPicker::vtkAbstractPicker ( ) [protected]

vtkAbstractPicker::~vtkAbstractPicker ( ) [protected]

Member Function Documentation

virtual const char* vtkAbstractPicker::GetClassName ( ) [virtual]

Reimplemented from vtkObject.

Reimplemented in vtkAbstractPropPicker, vtkAreaPicker, vtkCellPicker, vtkPicker, vtkPointPicker, vtkPropPicker, vtkRenderedAreaPicker, vtkWorldPointPicker, and vtkVolumePicker.

static int vtkAbstractPicker::IsTypeOf ( const char * name ) [static]

Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkObject.

Reimplemented in vtkAbstractPropPicker, vtkAreaPicker, vtkCellPicker, vtkPicker, vtkPointPicker, vtkPropPicker, vtkRenderedAreaPicker, vtkWorldPointPicker, and vtkVolumePicker.

virtual int vtkAbstractPicker::IsA ( const char * name ) [virtual]

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkObject.

Reimplemented in vtkAbstractPropPicker, vtkAreaPicker, vtkCellPicker, vtkPicker, vtkPointPicker, vtkPropPicker, vtkRenderedAreaPicker, vtkWorldPointPicker, and vtkVolumePicker.

static vtkAbstractPicker* vtkAbstractPicker::SafeDownCast ( vtkObject * o ) [static]

Reimplemented from vtkObject.

Reimplemented in vtkAbstractPropPicker, vtkAreaPicker, vtkCellPicker, vtkPicker, vtkPointPicker, vtkPropPicker, vtkRenderedAreaPicker, vtkWorldPointPicker, and vtkVolumePicker.

void vtkAbstractPicker::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)			`[virtual]`

Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkObject.

Reimplemented in vtkAbstractPropPicker, vtkAreaPicker, vtkCellPicker, vtkPicker, vtkPointPicker, vtkPropPicker, vtkRenderedAreaPicker, vtkWorldPointPicker, and vtkVolumePicker.

virtual vtkRenderer* vtkAbstractPicker::GetRenderer ( ) [virtual]

Get the renderer in which pick event occurred.

virtual double* vtkAbstractPicker::GetSelectionPoint ( ) [virtual]

Get the selection point in screen (pixel) coordinates. The third value is related to z-buffer depth. (Normally should be =0.)

virtual void vtkAbstractPicker::GetSelectionPoint ( double data[3] ) [virtual]

Get the selection point in screen (pixel) coordinates. The third value is related to z-buffer depth. (Normally should be =0.)

virtual double* vtkAbstractPicker::GetPickPosition ( ) [virtual]

Return position in global coordinates of pick point.

virtual void vtkAbstractPicker::GetPickPosition ( double data[3] ) [virtual]

Return position in global coordinates of pick point.

virtual int vtkAbstractPicker::Pick	(	double	selectionX,
		double	selectionY,
		double	selectionZ,
		vtkRenderer *	renderer
	)			`[pure virtual]`

Perform pick operation with selection point provided. Normally the first two values for the selection point are x-y pixel coordinate, and the third value is =0. Return non-zero if something was successfully picked.

Implemented in vtkCellPicker, vtkPicker, vtkPropPicker, and vtkWorldPointPicker.

int vtkAbstractPicker::Pick	(	double	selectionPt[3],
		vtkRenderer *	ren
	)			`[inline]`

provided. Normally the first two values for the selection point are x-y pixel coordinate, and the third value is =0. Return non-zero if something was successfully picked.

Reimplemented in vtkPicker, vtkPropPicker, and vtkWorldPointPicker.

Definition at line 101 of file vtkAbstractPicker.h.

virtual void vtkAbstractPicker::SetPickFromList ( int ) [virtual]

Use these methods to control whether to limit the picking to this list (rather than renderer's actors). Make sure that the pick list contains actors that referred to by the picker's renderer.

virtual int vtkAbstractPicker::GetPickFromList ( ) [virtual]

Use these methods to control whether to limit the picking to this list (rather than renderer's actors). Make sure that the pick list contains actors that referred to by the picker's renderer.

virtual void vtkAbstractPicker::PickFromListOn ( ) [virtual]

Use these methods to control whether to limit the picking to this list (rather than renderer's actors). Make sure that the pick list contains actors that referred to by the picker's renderer.

virtual void vtkAbstractPicker::PickFromListOff ( ) [virtual]

Use these methods to control whether to limit the picking to this list (rather than renderer's actors). Make sure that the pick list contains actors that referred to by the picker's renderer.

void vtkAbstractPicker::InitializePickList ( )

Initialize list of actors in pick list.

void vtkAbstractPicker::AddPickList ( vtkProp * )

Add an actor to the pick list.

void vtkAbstractPicker::DeletePickList ( vtkProp * )

Delete an actor from the pick list.

vtkPropCollection* vtkAbstractPicker::GetPickList ( ) [inline]

Return the list of actors in the PickList.

Definition at line 124 of file vtkAbstractPicker.h.

virtual void vtkAbstractPicker::Initialize ( ) [protected, virtual]

Reimplemented in vtkAbstractPropPicker, vtkAreaPicker, vtkCellPicker, vtkPicker, vtkPointPicker, and vtkPropPicker.