The QCanvasText class provides a text object on a QCanvas.canvasA canvas text item has text with font, color and alignment attributes. The text and font can be set in the constructor or set or changed later with setText() and setFont(). The color is set with setColor() and the alignment with setTextFlags(). The text item's bounding rectangle is retrieved with boundingRect(). Más...

#include <qcanvas.h>

Diagrama de herencias de QCanvasText

Lista de todos los miembros.

Métodos públicos
	QCanvasText (QCanvas *canvas)
	QCanvasText (const QString &, QCanvas *canvas)
	QCanvasText (const QString &, QFont, QCanvas *canvas)
virtual	~QCanvasText ()
void	setText (const QString &)
void	setFont (const QFont &)
void	setColor (const QColor &)
QString	text () const
QFont	font () const
QColor	color () const
void	moveBy (double dx, double dy)
int	textFlags () const
void	setTextFlags (int)
QRect	boundingRect () const
bool	collidesWith (const QCanvasItem *) const
int	rtti () const
	QCanvasText (QCanvas *canvas)
	QCanvasText (const QString &, QCanvas *canvas)
	QCanvasText (const QString &, QFont, QCanvas *canvas)
virtual	~QCanvasText ()
void	setText (const QString &)
void	setFont (const QFont &)
void	setColor (const QColor &)
QString	text () const
QFont	font () const
QColor	color () const
void	moveBy (double dx, double dy)
int	textFlags () const
void	setTextFlags (int)
QRect	boundingRect () const
bool	collidesWith (const QCanvasItem *) const
int	rtti () const
Atributos públicos estáticos
static int	RTTI = Rtti_Text
Métodos protegidos
virtual void	draw (QPainter &)
virtual void	draw (QPainter &)

Descripción detallada

The QCanvasText class provides a text object on a QCanvas.

canvas

A canvas text item has text with font, color and alignment attributes. The text and font can be set in the constructor or set or changed later with setText() and setFont(). The color is set with setColor() and the alignment with setTextFlags(). The text item's bounding rectangle is retrieved with boundingRect().

The text can be drawn on a painter with draw().

Like any other canvas item text items can be moved with QCanvasItem::move() and QCanvasItem::moveBy(), or by setting coordinates with QCanvasItem::setX(), QCanvasItem::setY() and QCanvasItem::setZ().

Documentación del constructor y destructor

QCanvasText::QCanvasText ( QCanvas * canvas )

Constructs a QCanvasText with the text "\<text\>", on canvas.

QCanvasText::QCanvasText	(	const QString &	t,
		QCanvas *	canvas
	)

Constructs a QCanvasText with the text t, on canvas canvas.

QCanvasText::QCanvasText	(	const QString &	t,
		QFont	f,
		QCanvas *	canvas
	)

Constructs a QCanvasText with the text t and font f, on the canvas canvas.

QCanvasText::~QCanvasText ( ) [virtual]

Destroys the canvas text item.

QCanvasText::QCanvasText ( QCanvas * canvas )

QCanvasText::QCanvasText	(	const QString &	,
		QCanvas *	canvas
	)

QCanvasText::QCanvasText	(	const QString &	,
		QFont	,
		QCanvas *	canvas
	)

virtual QCanvasText::~QCanvasText ( ) [virtual]

Documentación de las funciones miembro

QRect QCanvasText::boundingRect ( ) const [virtual]

Returns the bounding rectangle of the text.

Implementa QCanvasItem.

QRect QCanvasText::boundingRect ( ) const [virtual]

Returns the bounding rectangle in pixels that the canvas item covers.

Ver también:: boundingRectAdvanced()

Implementa QCanvasItem.

bool QCanvasText::collidesWith ( const QCanvasItem * i ) const [virtual]

Implementa QCanvasItem.

bool QCanvasText::collidesWith ( const QCanvasItem * other ) const [virtual]

Returns TRUE if the canvas item will collide with the other item after they have moved by their current velocities; otherwise returns FALSE.

Ver también:: collisions()

Implementa QCanvasItem.

QColor QCanvasText::color ( ) const

Returns the color of the text.

Ver también:: setColor()

void QCanvasText::draw ( QPainter & painter ) [protected, virtual]

Draws the text using the painter painter.

Implementa QCanvasItem.

virtual void QCanvasText::draw ( QPainter & painter ) [protected, virtual]

This abstract virtual function draws the canvas item using painter.

Atención:: When you reimplement this function, make sure that you leave the painter in the same state as you found it. For example, if you start by calling QPainter::translate(50, 50), end your code by calling QPainter::translate(-50, -50). Be also aware that the painter might already have some transformations set (i.e., don't call QPainter::resetXForm() when you're done).

Implementa QCanvasItem.

QFont QCanvasText::font ( ) const

Returns the font in which the text is drawn.

Ver también:: setFont()

void QCanvasText::moveBy	(	double	dx,
		double	dy
	)		`[virtual]`

Moves the canvas item relative to its current position by (dx, dy).

Reimplementado de QCanvasItem.

void QCanvasText::moveBy	(	double	dx,
		double	dy
	)		`[virtual]`

Reimplementado de QCanvasItem.

int QCanvasText::rtti ( ) const [virtual]

Returns 0 (QCanvasItem::Rtti_Item).

Make your derived classes return their own values for rtti(), so that you can distinguish between objects returned by QCanvas::at(). You should use values greater than 1000 to allow for extensions to this class.

Overuse of this functionality can damage it's extensibility. For example, once you have identified a base class of a QCanvasItem found by QCanvas::at(), cast it to that type and call meaningful methods rather than acting upon the object based on its rtti value.

For example:

        QCanvasItem* item;
        // Find an item, e.g. with QCanvasItem::collisions().
        ...
        if (item->rtti() == MySprite::RTTI ) {
            MySprite* s = (MySprite*)item;
            if (s->isDamagable()) s->loseHitPoints(1000);
            if (s->isHot()) myself->loseHitPoints(1000);
            ...
        }

Reimplementado de QCanvasItem.

int QCanvasText::rtti ( ) const [virtual]

Returns 3 (QCanvasItem::Rtti_Text).