Referencia de la Clase QPaintDeviceMetrics

The QPaintDeviceMetrics class provides information about a paint device. Más...

#include <qpaintdevicemetrics.h>

Lista de todos los miembros.

Tipos públicos
enum	{   PdmWidth = 1, PdmHeight, PdmWidthMM, PdmHeightMM,   PdmNumColors, PdmDepth, PdmDpiX, PdmDpiY,   PdmPhysicalDpiX, PdmPhysicalDpiY }
enum	{   PdmWidth = 1, PdmHeight, PdmWidthMM, PdmHeightMM,   PdmNumColors, PdmDepth, PdmDpiX, PdmDpiY,   PdmPhysicalDpiX, PdmPhysicalDpiY }
Métodos públicos
	QPaintDeviceMetrics (const QPaintDevice *)
int	width () const
int	height () const
int	widthMM () const
int	heightMM () const
int	logicalDpiX () const
int	logicalDpiY () const
int	physicalDpiX () const
int	physicalDpiY () const
int	numColors () const
int	depth () const
	QPaintDeviceMetrics (const QPaintDevice *)
int	width () const
int	height () const
int	widthMM () const
int	heightMM () const
int	logicalDpiX () const
int	logicalDpiY () const
int	physicalDpiX () const
int	physicalDpiY () const
int	numColors () const
int	depth () const

---

Descripción detallada

The QPaintDeviceMetrics class provides information about a paint device.

Sometimes when drawing graphics it is necessary to obtain information about the physical characteristics of a paint device. This class provides the information. For example, to compute the aspect ratio of a paint device:

        QPaintDeviceMetrics pdm( myWidget );
        double aspect = (double)pdm.widthMM() / (double)pdm.heightMM();

QPaintDeviceMetrics contains methods to provide the width and height of a device in both pixels (width() and height()) and millimeters (widthMM() and heightMM()), the number of colors the device supports (numColors()), the number of bit planes (depth()), and the resolution of the device (logicalDpiX() and logicalDpiY()).

It is not always possible for QPaintDeviceMetrics to compute the values you ask for, particularly for external devices. The ultimate example is asking for the resolution of of a QPrinter that is set to "print to file": who knows what printer that file will end up on?

---

Documentación de las enumeraciones miembro de la clase

anonymous enum

Valores de enumeraciones:

PdmWidth
PdmHeight
PdmWidthMM
PdmHeightMM
PdmNumColors
PdmDepth
PdmDpiX
PdmDpiY
PdmPhysicalDpiX
PdmPhysicalDpiY

anonymous enum

Valores de enumeraciones:

PdmWidth
PdmHeight
PdmWidthMM
PdmHeightMM
PdmNumColors
PdmDepth
PdmDpiX
PdmDpiY
PdmPhysicalDpiX
PdmPhysicalDpiY

---

Documentación del constructor y destructor

QPaintDeviceMetrics::QPaintDeviceMetrics

(

const QPaintDevice *

pd

)

Constructs a metric for the paint device pd.

QPaintDeviceMetrics::QPaintDeviceMetrics

(

const QPaintDevice *

)

---

Documentación de las funciones miembro

int QPaintDeviceMetrics::depth

(

)

const [inline]

Returns the bit depth (number of bit planes) of the paint device.

int QPaintDeviceMetrics::depth

(

)

const [inline]

int QPaintDeviceMetrics::height

(

)

const [inline]

Returns the height of the paint device in default coordinate system units (e.g. pixels for QPixmap and QWidget).

int QPaintDeviceMetrics::height

(

)

const [inline]

int QPaintDeviceMetrics::heightMM

(

)

const [inline]

Returns the height of the paint device, measured in millimeters.

int QPaintDeviceMetrics::heightMM

(

)

const [inline]

int QPaintDeviceMetrics::logicalDpiX

(

)

const [inline]

Returns the horizontal resolution of the device in dots per inch, which is used when computing font sizes. For X, this is usually the same as could be computed from widthMM(), but it varies on Windows.

int QPaintDeviceMetrics::logicalDpiX

(

)

const [inline]

int QPaintDeviceMetrics::logicalDpiY

(

)

const [inline]

int QPaintDeviceMetrics::logicalDpiY

(

)

const [inline]

Returns the vertical resolution of the device in dots per inch, which is used when computing font sizes. For X, this is usually the same as could be computed from heightMM(), but it varies on Windows.

int QPaintDeviceMetrics::numColors

(

)

const [inline]

Returns the number of different colors available for the paint device. Since this value is an int will not be sufficient to represent the number of colors on 32 bit displays, in which case INT_MAX is returned instead.

int QPaintDeviceMetrics::numColors

(

)

const [inline]

int QPaintDeviceMetrics::physicalDpiX

(

)

const [inline]

int QPaintDeviceMetrics::physicalDpiX

(

)

const [inline]

int QPaintDeviceMetrics::physicalDpiY

(

)

const [inline]

int QPaintDeviceMetrics::physicalDpiY

(

)

const [inline]

int QPaintDeviceMetrics::width

(

)

const [inline]

int QPaintDeviceMetrics::width

(

)

const [inline]

Returns the width of the paint device in default coordinate system units (e.g. pixels for QPixmap and QWidget).

int QPaintDeviceMetrics::widthMM

(

)

const [inline]

int QPaintDeviceMetrics::widthMM

(

)

const [inline]

Returns the width of the paint device, measured in millimeters.

---

La documentación para esta clase fue generada a partir de los siguientes ficheros:

• src/qt/include/qpaintdevicemetrics.h
• src/qt/src/kernel/qpaintdevicemetrics.h
• src/qt/src/kernel/qpaintdevicemetrics.cpp