Main Page   Class Hierarchy   Alphabetical List   Compound List   Compound Members   Related Pages  

vtkAbstractPicker Class Reference

define API for picking subclasses. More...

#include <vtkAbstractPicker.h>

Inheritance diagram for vtkAbstractPicker:

Inheritance graph
[legend]
Collaboration diagram for vtkAbstractPicker:

Collaboration graph
[legend]
List of all members.

Public Methods

virtual const char * GetClassName ()
virtual int IsA (const char *type)
void PrintSelf (ostream &os, vtkIndent indent)
virtual vtkRendererGetRenderer ()
virtual float * GetSelectionPoint ()
virtual void GetSelectionPoint (float data[3])
virtual float * GetPickPosition ()
virtual void GetPickPosition (float data[3])
virtual int Pick (float selectionX, float selectionY, float selectionZ, vtkRenderer *renderer)=0
int Pick (float selectionPt[3], vtkRenderer *ren)
void SetStartPickMethod (void(*f)(void *), void *arg)
void SetPickMethod (void(*f)(void *), void *arg)
void SetEndPickMethod (void(*f)(void *), void *arg)
void SetStartPickMethodArgDelete (void(*f)(void *))
void SetPickMethodArgDelete (void(*f)(void *))
void SetEndPickMethodArgDelete (void(*f)(void *))
virtual void SetPickFromList (int)
virtual int GetPickFromList ()
virtual void PickFromListOn ()
virtual void PickFromListOff ()
void InitializePickList ()
void AddPickList (vtkProp *)
void DeletePickList (vtkProp *)
vtkPropCollectionGetPickList ()

Static Public Methods

int IsTypeOf (const char *type)
vtkAbstractPicker * SafeDownCast (vtkObject *o)

Protected Methods

 vtkAbstractPicker ()
 ~vtkAbstractPicker ()
 vtkAbstractPicker (const vtkAbstractPicker &)
void operator= (const vtkAbstractPicker &)
virtual void Initialize ()

Protected Attributes

vtkRendererRenderer
float SelectionPoint [3]
float PickPosition [3]
void(* StartPickMethod )(void *)
void(* StartPickMethodArgDelete )(void *)
void * StartPickMethodArg
void(* PickMethod )(void *)
void * PickMethodArg
void(* PickMethodArgDelete )(void *)
void(* EndPickMethod )(void *)
void(* EndPickMethodArgDelete )(void *)
void * EndPickMethodArg
int PickFromList
vtkPropCollectionPickList

Detailed Description

define API for picking subclasses.

Date:
2000/12/10 20:08:29
Revision:
1.3

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 has hooks for methods to call during the picking process. These methods are StartPickMethod(), PickMethod(), and EndPickMethod() 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 PickMethod() of vtkProp (and its subclasses such as vtkActor) is called prior to the pick method 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).
Warning:
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.


Member Function Documentation

void vtkAbstractPicker::AddPickList vtkProp  
 

Add an actor to the pick list.

void vtkAbstractPicker::DeletePickList vtkProp  
 

Delete an actor from the pick list.

virtual const char* vtkAbstractPicker::GetClassName   [virtual]
 

Return the class name as a string. This method is defined in all subclasses of vtkObject with the vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkObject.

Reimplemented in vtkAbstractPropPicker.

vtkPropCollection* vtkAbstractPicker::GetPickList   [inline]
 

Return the list of actors in the PickList.

virtual float* vtkAbstractPicker::GetPickPosition   [virtual]
 

Return position in global coordinates of pick point.

virtual vtkRenderer* vtkAbstractPicker::GetRenderer   [virtual]
 

Get the renderer in which pick event occurred.

virtual float* vtkAbstractPicker::GetSelectionPoint   [virtual]
 

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

void vtkAbstractPicker::InitializePickList  
 

Initialize list of actors in pick list.

virtual int vtkAbstractPicker::IsA const char *    type [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.

int vtkAbstractPicker::IsTypeOf const char *    type [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.

int vtkAbstractPicker::Pick float    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.

virtual int vtkAbstractPicker::Pick float    selectionX,
float    selectionY,
float    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 vtkPicker.

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.

vtkAbstractPicker* vtkAbstractPicker::SafeDownCast vtkObject   o [static]
 

Will cast the supplied object to vtkObject* is this is a safe operation (i.e., a safe downcast); otherwise NULL is returned. This method is defined in all subclasses of vtkObject with the vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkObject.

Reimplemented in vtkAbstractPropPicker.

void vtkAbstractPicker::SetEndPickMethod void(*    f)(void *),
void *    arg
 

Specify function to be called after all picking operations have been performed.

void vtkAbstractPicker::SetEndPickMethodArgDelete void(*    f)(void *)
 

Set a method to delete user arguments for EndPickMethod.

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.

void vtkAbstractPicker::SetPickMethod void(*    f)(void *),
void *    arg
 

Specify function to be called when something is picked.

void vtkAbstractPicker::SetPickMethodArgDelete void(*    f)(void *)
 

Set a method to delete user arguments for PickMethod.

void vtkAbstractPicker::SetStartPickMethod void(*    f)(void *),
void *    arg
 

begins.

void vtkAbstractPicker::SetStartPickMethodArgDelete void(*    f)(void *)
 

Set a method to delete user arguments for StartPickMethod.


The documentation for this class was generated from the following file:
Generated on Tue Mar 19 13:23:27 2002 for VTK by doxygen1.2.14 written by Dimitri van Heesch, © 1997-2002