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RedHat 9 (Linux i386) - man page for qpaintdevice (redhat section 3qt)

QPaintDevice(3qt)								QPaintDevice(3qt)

NAME
       QPaintDevice - The base class of objects that can be painted

SYNOPSIS
       #include <qpaintdevice.h>

       Inherited by QPixmap, QWidget, QPicture, and QPrinter.

   Public Members
       virtual ~QPaintDevice ()
       bool isExtDev () const
       bool paintingActive () const
       virtual HDC handle () const
       virtual Qt::HANDLE handle () const
       Display * x11Display () const
       int x11Screen () const
       int x11Depth () const
       int x11Cells () const
       Qt::HANDLE x11Colormap () const
       bool x11DefaultColormap () const
       void * x11Visual () const
       bool x11DefaultVisual () const

   Static Public Members
       Display * x11AppDisplay ()
       int x11AppScreen ()
       int x11AppDpiX ()
       int x11AppDpiY ()
       void x11SetAppDpiX ( int dpi )
       void x11SetAppDpiY ( int dpi )
       int x11AppDepth ()
       int x11AppCells ()
       Qt::HANDLE x11AppRootWindow ()
       Qt::HANDLE x11AppColormap ()
       bool x11AppDefaultColormap ()
       void * x11AppVisual ()
       bool x11AppDefaultVisual ()
       int x11AppDepth ( int screen )
       int x11AppCells ( int screen )
       Qt::HANDLE x11AppRootWindow ( int screen )
       Qt::HANDLE x11AppColormap ( int screen )
       void * x11AppVisual ( int screen )
       bool x11AppDefaultColormap ( int screen )
       bool x11AppDefaultVisual ( int screen )
       int x11AppDpiX ( int screen )
       int x11AppDpiY ( int screen )
       void x11SetAppDpiX ( int dpi, int screen )
       void x11SetAppDpiY ( int dpi, int screen )

   Protected Members
       QPaintDevice ( uint devflags )
       virtual bool cmd ( int, QPainter *, QPDevCmdParam * )

RELATED FUNCTION DOCUMENTATION
       void bitBlt ( QPaintDevice * dst, int dx, int dy, const QPaintDevice * src, int sx, int
	   sy, int sw, int sh, Qt::RasterOp rop, bool ignoreMask )
       void bitBlt ( QPaintDevice * dst, const QPoint & dp, const QPaintDevice * src, const QRect
	   & sr, RasterOp rop )

DESCRIPTION
       The QPaintDevice class is the base class of objects that can be painted.

       A paint device is an abstraction of a two-dimensional space that can be drawn using a
       QPainter. The drawing capabilities are implemented by the subclasses QWidget, QPixmap,
       QPicture and QPrinter.

       The default coordinate system of a paint device has its origin located at the top-left
       position. X increases to the right and Y increases downward. The unit is one pixel. There
       are several ways to set up a user-defined coordinate system using the painter, for
       example, using QPainter::setWorldMatrix().

       Example (draw on a paint device):

	   void MyWidget::paintEvent( QPaintEvent * )
	   {
	       QPainter p;			 // our painter
	       p.begin( this ); 		 // start painting the widget
	       p.setPen( red ); 		 // red outline
	       p.setBrush( yellow );		 // yellow fill
	       p.drawEllipse( 10, 20, 100,100 ); // 100x100 ellipse at position (10, 20)
	       p.end(); 			 // painting done
	   }

       The bit block transfer is an extremely useful operation for copying pixels from one paint
       device to another (or to itself). It is implemented as the global function bitBlt().

       Example (scroll widget contents 10 pixels to the right):

	   bitBlt( myWidget, 10, 0, myWidget );

       Warning: Qt requires that a QApplication object exists before any paint devices can be
       created. Paint devices access window system resources, and these resources are not
       initialized before an application object is created.

       See also Graphics Classes and Image Processing Classes.

MEMBER FUNCTION DOCUMENTATION
QPaintDevice::QPaintDevice ( uint devflags ) [protected]
       Constructs a paint device with internal flags devflags. This constructor can be invoked
       only from QPaintDevice subclasses.

QPaintDevice::~QPaintDevice () [virtual]
       Destroys the paint device and frees window system resources.

bool QPaintDevice::cmd ( int, QPainter *, QPDevCmdParam * ) [virtual protected]
       Internal virtual function that interprets drawing commands from the painter.

       Implemented by subclasses that have no direct support for drawing graphics (external paint
       devices, for example, QPicture).

Qt::HANDLE QPaintDevice::handle () const [virtual]
       Returns the window system handle of the paint device, for low-level access. Using this
       function is not portable.

       The HANDLE type varies with platform; see qpaintdevice.h and qwindowdefs.h for details.

       See also x11Display().

bool QPaintDevice::isExtDev () const
       Returns TRUE if the device is an external paint device; otherwise returns FALSE.

       External paint devices cannot be bitBlt()'ed from. QPicture and QPrinter are external
       paint devices.

bool QPaintDevice::paintingActive () const
       Returns TRUE if the device is being painted, i.e. someone has called QPainter::begin() but
       not yet called QPainter::end() for this device; otherwise returns FALSE.

       See also QPainter::isActive().

int QPaintDevice::x11AppCells () [static]
       Returns the number of entries in the colormap for the default screen of the X display
       global to the application (X11 only). Using this function is not portable.

       See also x11Colormap().

int QPaintDevice::x11AppCells ( int screen ) [static]
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the number of entries in the colormap for screen screen of the X display global to
       the application (X11 only). Using this function is not portable.

       See also x11Colormap().

Qt::HANDLE QPaintDevice::x11AppColormap () [static]
       Returns the colormap for the default screen of the X display global to the application
       (X11 only). Using this function is not portable.

       See also x11Cells().

Qt::HANDLE QPaintDevice::x11AppColormap ( int screen ) [static]
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the colormap for screen screen of the X display global to the application (X11
       only). Using this function is not portable.

       See also x11Cells().

bool QPaintDevice::x11AppDefaultColormap () [static]
       Returns the default colormap for the default screen of the X display global to the
       application (X11 only). Using this function is not portable.

       See also x11Cells().

bool QPaintDevice::x11AppDefaultColormap ( int screen ) [static]
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the default colormap for screen screen of the X display global to the application
       (X11 only). Using this function is not portable.

       See also x11Cells().

bool QPaintDevice::x11AppDefaultVisual () [static]
       Returns TRUE if the Visual used is the default for the default screen of the X display
       global to the application (X11 only); otherwise returns FALSE. Using this function is not
       portable.

bool QPaintDevice::x11AppDefaultVisual ( int screen ) [static]
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns TRUE if the Visual used is the default for screen screen of the X display global
       to the application (X11 only); otherwise returns FALSE. Using this function is not
       portable.

int QPaintDevice::x11AppDepth ( int screen ) [static]
       Returns the depth for screen screen of the X display global to the application (X11 only).
       Using this function is not portable.

       See also QPixmap::defaultDepth().

int QPaintDevice::x11AppDepth () [static]
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the depth for the default screen of the X display global to the application (X11
       only). Using this function is not portable.

       See also QPixmap::defaultDepth().

Display * QPaintDevice::x11AppDisplay () [static]
       Returns a pointer to the X display global to the application (X11 only). Using this
       function is not portable.

       See also handle().

int QPaintDevice::x11AppDpiX ( int screen ) [static]
       Returns the horizontal DPI of the X display (X11 only) for screen screen. Using this
       function is not portable. See QPaintDeviceMetrics for portable access to related
       information. Using this function is not portable.

       See also x11AppDpiY(), x11SetAppDpiX(), and QPaintDeviceMetrics::logicalDpiX().

int QPaintDevice::x11AppDpiX () [static]
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the horizontal DPI of the X display (X11 only) for the default screen. Using this
       function is not portable. See QPaintDeviceMetrics for portable access to related
       information. Using this function is not portable.

int QPaintDevice::x11AppDpiY ( int screen ) [static]
       Returns the vertical DPI of the X11 display (X11 only) for screen screen. Using this
       function is not portable. See QPaintDeviceMetrics for portable access to related
       information. Using this function is not portable.

       See also x11AppDpiX(), x11SetAppDpiY(), and QPaintDeviceMetrics::logicalDpiY().

int QPaintDevice::x11AppDpiY () [static]
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the vertical DPI of the X11 display (X11 only) for the default screen. Using this
       function is not portable. See QPaintDeviceMetrics for portable access to related
       information. Using this function is not portable.

       See also x11AppDpiX(), x11SetAppDpiY(), and QPaintDeviceMetrics::logicalDpiY().

Qt::HANDLE QPaintDevice::x11AppRootWindow () [static]
       Returns the root window for the default screen of the X display global to the applicatoin
       (X11 only). Using this function is not portable.

Qt::HANDLE QPaintDevice::x11AppRootWindow ( int screen ) [static]
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the root window for screen screen of the X display global to the applicatoin (X11
       only). Using this function is not portable.

int QPaintDevice::x11AppScreen () [static]
       Returns the screen number on the X display global to the application (X11 only). Using
       this function is not portable.

void * QPaintDevice::x11AppVisual () [static]
       Returns the Visual for the default screen of the X display global to the application (X11
       only). Using this function is not portable.

void * QPaintDevice::x11AppVisual ( int screen ) [static]
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Returns the Visual for screen screen of the X display global to the application (X11
       only). Using this function is not portable.

int QPaintDevice::x11Cells () const
       Returns the number of entries in the colormap of the X display for the paint device (X11
       only). Using this function is not portable.

       See also x11Colormap().

Qt::HANDLE QPaintDevice::x11Colormap () const
       Returns the colormap of the X display for the paint device (X11 only). Using this function
       is not portable.

       See also x11Cells().

bool QPaintDevice::x11DefaultColormap () const
       Returns the default colormap of the X display for the paint device (X11 only). Using this
       function is not portable.

       See also x11Cells().

bool QPaintDevice::x11DefaultVisual () const
       Returns the default Visual of the X display for the paint device (X11 only). Using this
       function is not portable.

int QPaintDevice::x11Depth () const
       Returns the depth of the X display for the paint device (X11 only). Using this function is
       not portable.

       See also QPixmap::defaultDepth().

Display * QPaintDevice::x11Display () const
       Returns a pointer to the X display for the paint device (X11 only). Using this function is
       not portable.

       See also handle().

int QPaintDevice::x11Screen () const
       Returns the screen number on the X display for the paint device (X11 only). Using this
       function is not portable.

void QPaintDevice::x11SetAppDpiX ( int dpi, int screen ) [static]
       Sets the value returned by x11AppDpiX() to dpi for screen screen. The default is
       determined by the display configuration. Changing this value will alter the scaling of
       fonts and many other metrics and is not recommended. Using this function is not portable.

       See also x11SetAppDpiY().

void QPaintDevice::x11SetAppDpiX ( int dpi ) [static]
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Sets the value returned by x11AppDpiX() to dpi for the default screen. The default is
       determined by the display configuration. Changing this value will alter the scaling of
       fonts and many other metrics and is not recommended. Using this function is not portable.

void QPaintDevice::x11SetAppDpiY ( int dpi, int screen ) [static]
       Sets the value returned by x11AppDpiY() to dpi for screen screen. The default is
       determined by the display configuration. Changing this value will alter the scaling of
       fonts and many other metrics and is not recommended. Using this function is not portable.

       See also x11SetAppDpiX().

void QPaintDevice::x11SetAppDpiY ( int dpi ) [static]
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Sets the value returned by x11AppDpiY() to dpi for the default screen. The default is
       determined by the display configuration. Changing this value will alter the scaling of
       fonts and many other metrics and is not recommended. Using this function is not portable.

void * QPaintDevice::x11Visual () const
       Returns the Visual of the X display for the paint device (X11 only). Using this function
       is not portable.

RELATED FUNCTION DOCUMENTATION
void bitBlt ( QPaintDevice * dst, int dx, int dy, const QPaintDevice * src, int sx, int sy, int
       sw, int sh, Qt::RasterOp rop, bool ignoreMask )
       Copies a block of pixels from src to dst, perhaps merging each pixel according to the
       raster operation rop. sx, sy is the top-left pixel in src (0, 0) by default, dx, dy is the
       top-left position in dst and sw, sh is the size of the copied block (all of src by
       default).

       The most common values for rop are CopyROP and XorROP; the Qt::RasterOp documentation
       defines all the possible values.

       If ignoreMask is TRUE (the default is FALSE) and src is a masked QPixmap, the entire blit
       is masked by src->mask().

       If src, dst, sw or sh is 0, bitBlt() does nothing. If sw or sh is negative bitBlt() copies
       starting at sx (and respectively, sy) and ending at the right end (respectively, bottom)
       of src.

       src must be a QWidget or QPixmap. You cannot blit from a QPrinter, for example. bitBlt()
       does nothing if you attempt to blit from an unsupported device.

       bitBlt() does nothing if src has a greater depth than dst. If you need to for example,
       draw a 24-bit pixmap on an 8-bit widget, you must use drawPixmap().

void bitBlt ( QPaintDevice * dst, const QPoint &; dp, const QPaintDevice * src, const QRect & sr,
       RasterOp rop )
       This is an overloaded member function, provided for convenience. It behaves essentially
       like the above function.

       Overloaded bitBlt() with the destination point dp and source rectangle sr.

SEE ALSO
       http://doc.trolltech.com/qpaintdevice.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2001 Trolltech AS, http://www.trolltech.com.  See the license file included
       in the distribution for a complete license statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at
       $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is
       provided as a convenience for those users who prefer man pages, although this format is
       not officially supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.
       Please include the name of the manual page (qpaintdevice.3qt) and the Qt version (3.1.1).

Trolltech AS				 9 December 2002			QPaintDevice(3qt)


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