NIS_InteractiveObject Class Reference

#include <NIS_InteractiveObject.hxx>

Inheritance diagram for NIS_InteractiveObject:

[legend]

Public Member Functions
	NIS_InteractiveObject ()
virtual	~NIS_InteractiveObject ()
Standard_Integer	ID () const
NIS_Drawer::DrawType	DrawType () const
const Handle_NIS_Drawer &	SetDrawer (const Handle_NIS_Drawer &theDrawer)
const Handle_NIS_Drawer &	GetDrawer () const
virtual Handle_NIS_Drawer	DefaultDrawer () const =0
const Bnd_B3f &	GetBox ()
Standard_Boolean	IsTransparent () const
Standard_Boolean	IsHidden () const
Standard_Boolean	IsDisplayed () const
Standard_Boolean	IsDynHilighted () const
Standard_Boolean	IsSelectable () const
void	SetSelectable (const Standard_Boolean isSel=Standard_True) const
Standard_Real	Transparency () const
void	SetTransparency (const Standard_Real theValue=0.6)
void	UnsetTransparency ()
virtual Standard_Real	Intersect (const gp_Ax1 &theAxis, const Standard_Real theOver) const =0
virtual Standard_Boolean	Intersect (const Bnd_B3f &theBox, const gp_Trsf &theTrf, const Standard_Boolean isFull) const
void	SetAttribute (void *theAttributePtr)
void *	GetAttribute () const
Protected Member Functions
void	setDrawerUpdate () const
virtual void	computeBox ()=0
Standard_Boolean	isUpdateBox () const
void	setIsUpdateBox (const Standard_Boolean isUpdate)
Protected Attributes
Bnd_B3f	myBox
void *	myAttributePtr

---

Detailed Description

Abstract base type for presentable and selectable object in NIS architecture.

InteractiveObject_class

An InteractiveObject has the attributes:

• Integer ID that is unique within the Interactive Context that hosts this Object. Thsi ID is 0 if the Object is not yet attached to an InteractiveContext
• 3D Bounding box
• Presenatble state of the Object: Normal, Hilighted or Transparent.
• Visibility state (shown/hidden)
• Transparency level (0 to 1) - for transparent state

Because the class is abstract, it does not define any color, material and other visual aspect - all relevant aspects should be defined in derived classes.
Every InteractiveObject type should have an associated NIS_Drawer type; a new instance of this associated drawer is returned by the virtual method DefaultDrawer(). The drawer is responsible for the correct calculation of the presentation in every possible state (normal, hilighted, etc.); usually the associated drawer instance contains all relevant visual aspects.

Association with a Drawer instance is performed by method SetDrawer. This method should not be called by any custom code, it is used internally by NIS algorithms (in NIS_InteractiveContext::Display() for instance). If you develop your own InteractiveObject type, you will need to call SetDrawer whenever you change the visual aspect, for example:

 void MyIOClass::SetColor (const Quantity_Color&  theColor);
 {
   Handle(MyIOClassDrawer) aDrawer = new MyIOClassDrawer;
 // copy the current visual aspects and other attributes to the new Drawer
   aDrawer->Assign (GetDrawer());
 // replace the Drawer
   aDrawer->myColor = theColor;
   SetDrawer (aDrawer);
 // optional: redraws the changed InteractiveObject in the views
   GetDrawer()->GetContext()->UpdateViews();
 }

An instance of this class can have an associated value (Attribute) that is stored as a pointer. It can accommodate an integer/float/boolean value or a pointer to some structure. This attribute is NOT automatically destroyed with the InteractiveObject.

---

Constructor & Destructor Documentation

NIS_InteractiveObject::NIS_InteractiveObject

(

)

[inline]

Empty constructor. Creates an object that is not attached to drawer.

virtual NIS_InteractiveObject::~NIS_InteractiveObject

(

)

[virtual]

Destructor.

---

Member Function Documentation

virtual void NIS_InteractiveObject::computeBox

(

)

[protected, pure virtual]

Create a 3D bounding box of the object.

Implemented in NIS_Surface, and NIS_Triangulated.

virtual Handle_NIS_Drawer NIS_InteractiveObject::DefaultDrawer

(

)

const [pure virtual]

Create a default drawer instance.

Implemented in NIS_Surface, and NIS_Triangulated.

NIS_Drawer::DrawType NIS_InteractiveObject::DrawType

(

)

const [inline]

Query the type of presentation.

void* NIS_InteractiveObject::GetAttribute

(

)

const [inline]

Query the associated custom (arbitrary) attribute pointer.

const Bnd_B3f& NIS_InteractiveObject::GetBox

(

)

Query a 3D bounding box of the object.

const Handle_NIS_Drawer& NIS_InteractiveObject::GetDrawer

(

)

const [inline]

Query the current drawer.

Standard_Integer NIS_InteractiveObject::ID

(

)

const [inline]

Query the ID of the Object in its Context.

virtual Standard_Boolean NIS_InteractiveObject::Intersect	(	const Bnd_B3f &	theBox,
		const gp_Trsf &	theTrf,
		const Standard_Boolean	isFull
	)			const [virtual]

Intersect the InteractiveObject geometry with an oriented box. The default implementation (in this abstract class) always returns True, signalling that every object pre-selected by its bounding box is automatically selected. The specializations should define a more correct behaviour.
The algorithm should transform the InteractiveObject geometry using the parameter theTrf and then reject it with box theBox, like:

    gp_Pnt aPnt = ..... // aPnt is part of our geometry.
    if (!theBox.IsOut (aPnt.Transformed(theTrf)))
      return Standard_True;

Parameters:

	theBox	3D box of selection
	theTrf	Position/Orientation of the box. It coincides with theTrfInv that is passed to NIS_InteractiveObject::selectObjects().
	isFull	True if full inclusion is required (full inside the tested box) for the positive result, False - if only partial inclusion give a result.

Returns:

True if the InteractiveObject geometry intersects the box or is inside it

Reimplemented in NIS_Surface, and NIS_Triangulated.

virtual Standard_Real NIS_InteractiveObject::Intersect	(	const gp_Ax1 &	theAxis,
		const Standard_Real	theOver
	)			const [pure virtual]

Intersect the InteractiveObject geometry with a line/ray.

Parameters:

	theAxis	The line or ray in 3D space.
	theOver	Half-thickness of the selecting line.

Returns:

If the return value is more than 0.1*RealLast() then no intersection is detected. Otherwise returns the coordinate of thePnt on the ray. May be negative.

Implemented in NIS_Surface, and NIS_Triangulated.

Standard_Boolean NIS_InteractiveObject::IsDisplayed

(

)

const [inline]

Query the Displayed state - opposite to IsHidden().

Standard_Boolean NIS_InteractiveObject::IsDynHilighted

(

)

const [inline]

Query the Dynamic Hilight state

Standard_Boolean NIS_InteractiveObject::IsHidden

(

)

const [inline]

Query the Hidden state

Standard_Boolean NIS_InteractiveObject::IsSelectable

(

)

const

Query if the Object is selectable.

Standard_Boolean NIS_InteractiveObject::IsTransparent

(

)

const [inline]

Query the Transparent state.

Standard_Boolean NIS_InteractiveObject::isUpdateBox

(

)

const [inline, protected]

void NIS_InteractiveObject::SetAttribute

(

void *

theAttributePtr

)

[inline]

Set the pointer to custom (arbitrary) data associated with the Object.

const Handle_NIS_Drawer& NIS_InteractiveObject::SetDrawer

(

const Handle_NIS_Drawer &

theDrawer

)

Replace the drawer. This method must not be called for Object that has not yet been added to a Context (thus has empty drawer).
It is possible to have unassigned myDrawer or a DefaultDrawer as the parameter value (but not both). The Context where we work is taken from theDrawer first, then (if NULL) -- from myDrawer.
This method matches theDrawer with the available Drawers in the Context and adds if no match is found.

Returns:

Reference to the finally stored or found Drawer instance inside the Context.

void NIS_InteractiveObject::setDrawerUpdate

(

)

const [inline, protected]

void NIS_InteractiveObject::setIsUpdateBox

(

const Standard_Boolean

isUpdate

)

[inline, protected]

void NIS_InteractiveObject::SetSelectable

(

const Standard_Boolean

isSel = Standard_True

)

const

Set or change the selectable state of the Object.

Parameters:

isSel

True (default) - the Object will be selectable, False - it will be ignored by selection/hilighting algorithms.

void NIS_InteractiveObject::SetTransparency

(

const Standard_Real

theValue = 0.6

)

Set the Transparency factor.

Reimplemented in NIS_Surface.

Standard_Real NIS_InteractiveObject::Transparency

(

)

const [inline]

Query the Transparency factor.

void NIS_InteractiveObject::UnsetTransparency

(

)

[inline]

Present the Object as opaque (Normal draw type).

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Field Documentation

void* NIS_InteractiveObject::myAttributePtr [protected]

Bnd_B3f NIS_InteractiveObject::myBox [protected]

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

• NIS_InteractiveObject.hxx