CIvfBufferSelection Class Reference

#include <ivf/IvfBufferSelection.h>

Inheritance diagram for CIvfBufferSelection:

List of all members.

Public Member Functions
	CIvfBufferSelection ()
virtual	~CIvfBufferSelection ()
	IvfClassInfo ("CIvfBufferSelection", CIvfBase)
int	pick (int x, int y)
void	update ()
void	setComposite (CIvfComposite *composite)
CIvfComposite *	getComposite ()
void	setView (CIvfView *view)
CIvfView *	getView ()
CIvfShape *	getSelectedShape ()
int	getSize ()
CIvfShape *	getSelectedShape (int idx)
CIvfSelectedShapesVector &	getSelectedShapes ()

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Detailed Description

Buffer selection class

This class implements object selection using the OpenGL selection buffer. The following code shows an example of using the CIvfBufferSelection class:

 void CExampleWindow::onInit(int width, int heigth)
 {
     m_camera = new CIvfCamera();
     m_camera->setPosition(...);
     
     m_scene = new CIvfComposite();
     
     ... Add some children to scene ...

     m_selection = new CIvfBufferSelection();
     m_selection->setView(m_camera);
     
     .
     .
     .
 }
 
 .
 .
 .

        if (isLeftButtonDown())
        {
                m_selection->pick(x, y);
                if (m_selection->getSelectedShape()!=NULL)
                {
                        m_selection->getSelectedShape()->setHighlight(CIvfShape::HS_ON);
                        redraw();
                }
                else
                {
                        m_scene->setHighlightChildren(CIvfShape::HS_OFF);
                        redraw();
                }
        }
        
        if (isRightButtonDown())
        {
                m_selection->pick(x, y);
                if (m_selection->getSize()!=0)
                {
                        for (i=0; i<m_selection->getSize(); i++)
                                m_selection->getSelectedShape(i)->setHighlight(CIvfShape::HS_ON);

                        redraw();
                }
                else
                {
                        m_scene->setHighlightChildren(CIvfShape::HS_OFF);
                        redraw();
                }
        }

Author:

Jonas Lindemann

Examples:

selection.cpp.

Definition at line 101 of file IvfBufferSelection.h.

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Constructor & Destructor Documentation

CIvfBufferSelection::CIvfBufferSelection (   )

CIvfBufferSelection constructor

virtual CIvfBufferSelection::~CIvfBufferSelection (   )  [virtual]

CIvfBufferSelection destructor

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Member Function Documentation

CIvfComposite* CIvfBufferSelection::getComposite (   )

Returns the composite with objects used in the selection

CIvfShape* CIvfBufferSelection::getSelectedShape (  int  idx  )

Returns the specified selected shape. Returns NULL if no object is selected or the selection operation failed.

CIvfShape* CIvfBufferSelection::getSelectedShape (   )

Returns the topmost selected shape. Returns NULL if no object is selected or the selection operation failed.

CIvfSelectedShapesVector& CIvfBufferSelection::getSelectedShapes (   )

Returns selected shapes Returns a STL vector of the selected shapes.

int CIvfBufferSelection::getSize (   )

Return the total number of selected shapes

CIvfView* CIvfBufferSelection::getView (   )

Returns view used for selection (required)

int CIvfBufferSelection::pick (  int  x, int  y )

Initiates a object selection This method can only be used when a valid OpenGL context exists. Parameters: x  - x position of mouse cursor in current viewport y  - y position of mouse cursor in current viewport Returns: number of object "hits"

void CIvfBufferSelection::setComposite (  CIvfComposite *  composite  )

Sets the objects used in the selection operation (required) This method also calls the update() method for updating the object selection list. See also: update

void CIvfBufferSelection::setView (  CIvfView *  view  )

Sets the view used for selection (required)

void CIvfBufferSelection::update (   )

Updates object selection list Selection is implemented by giving all objects in the composite a number and storing them in the object selection list, which is used for quick object lookup. When objects are added to the composite this list must be updated with the update() method.

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

• ivf/IvfBufferSelection.h

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