showing the name of object +mouse

[Spitfire]

If your sphere is a class deriving from graphics item (and it should be), and it lives in a scene (from what you said, so I assume it's QGraphicsScene) then in the constructor of the sphere set setAcceptHoverEvents( true ), and reimplement hoverEnterEvent and hoverLeaveEvent.

Something like that:

class MySphere : public QGraphicsItem
{
public:
    MySphere( QGraphicsItem* parent = 0 ) : QGraphicsItem( parent ), myName( "Not named!" )
    {
        this->setAcceptHoverEvents( true );
    }
 
    void    setValues( int x, int y, int z )
    {
        // do something
    }
 
    void    setName( const QString& name )
    {
        this->myName = name;
    }
 
protected:
    // add painting and all else you need
 
    void    hoverEnterEvent( QGraphicsSceneHoverEvent* event )
    {
        QToolTip::showText( event->screenPos(), this->myName );
    }
 
    void    hoverLeaveEvent( QGraphicsSceneHoverEvent* event )
    {
        Q_UNUSED( event );
 
        QToolTip::hideText();
    }
 
private:
    QString myName;
};

class MySphere : public QGraphicsItem
{
public:
    MySphere( QGraphicsItem* parent = 0 ) : QGraphicsItem( parent ), myName( "Not named!" )
    {
        this->setAcceptHoverEvents( true );
    }

    void    setValues( int x, int y, int z )
    {
        // do something
    }

    void    setName( const QString& name )
    {
        this->myName = name;
    }

protected:
    // add painting and all else you need

    void    hoverEnterEvent( QGraphicsSceneHoverEvent* event )
    {
        QToolTip::showText( event->screenPos(), this->myName );
    }

    void    hoverLeaveEvent( QGraphicsSceneHoverEvent* event )
    {
        Q_UNUSED( event );

        QToolTip::hideText();
    }

private:
    QString myName;
};

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Edit:
btw - dust on my screen is bigger than spheres on this black image

[rimie23]

If your sphere is a class deriving from graphics item (and it should be), and it lives in a scene (from what you said, so I assume it's QGraphicsScene) then in the constructor of the sphere set setAcceptHoverEvents( true ), and reimplement hoverEnterEvent and hoverLeaveEvent.

but it's not
i draw my spheres in the window of qt but i using ogre
and i store my spheres in vector to draw it i use

void OgreWidget::createScene()
{
	ogreSceneManager->setAmbientLight(Ogre::ColourValue(1,1,1));
 
    for(i=0,i<sphere.size(),i++)
    {
    int posx=sphere[i].x
    int posy=sphere[i].y
    int posz=sphere[i].z
   ent_sphere = ogreSceneManager->createEntity( sphere[i].name,Ogre::SceneManager:: PT_SPHERE);
 
 
sphereNode= ogreSceneManager->getRootSceneNode()->createChildSceneNode(sphere[i].name, Ogre::Vector3(kk, kkk, kkkk));
 
			 sphereNode->setScale(0.1f, 0.1f, 0.1f);
			sphereNode->attachObject(sphere_marker);
    }

void OgreWidget::createScene()
{
	ogreSceneManager->setAmbientLight(Ogre::ColourValue(1,1,1));
	
    for(i=0,i<sphere.size(),i++)
    {
    int posx=sphere[i].x
    int posy=sphere[i].y
    int posz=sphere[i].z
   ent_sphere = ogreSceneManager->createEntity( sphere[i].name,Ogre::SceneManager:: PT_SPHERE);
                        
						  
sphereNode= ogreSceneManager->getRootSceneNode()->createChildSceneNode(sphere[i].name, Ogre::Vector3(kk, kkk, kkkk));
			
			 sphereNode->setScale(0.1f, 0.1f, 0.1f);
			sphereNode->attachObject(sphere_marker);
    }

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[Spitfire]

Then use Ogre means of finding objects in the scene and retreiving their name.

Alternative would be to test all elements in the vector on every mouse move, but that is espensive and impractical.

Besides, if you're using Ogre to display the spheres, why not to use Ogre to display the name as well?
I'm pretty sure it can be done entirely inside Ogre.

[rimie23]

thank you
i just find how i do it in ogre thanks a lot