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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Qt Toolkit - QPaintDevice Class</title><style type="text/css"><!--
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<h1 align=center>QPaintDevice Class Reference</h1><br clear="all">
<p>
The base class of objects that can be painted.
<a href="#details">More...</a>
<p>
<code>#include <<a href="qpaintdevice-h.html">qpaintdevice.h</a>></code>
<p>Inherited by <a href="qpicture.html">QPicture</a>, <a href="qpixmap.html">QPixmap</a>, <a href="qprinter.html">QPrinter</a> and <a href="qwidget.html">QWidget</a>.
<p><a href="qpaintdevice-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class="fn">virtual<a href="#b1caad"><b>~QPaintDevice</b></a>()</div>
<li><div class="fn">int<a href="#754791"><b>devType</b></a>()const</div>
<li><div class="fn">bool<a href="#350135"><b>isExtDev</b></a>()const</div>
<li><div class="fn">bool<a href="#11c528"><b>paintingActive</b></a>()const</div>
<li><div class="fn">enum<b>PDevCmd</b>{PdcNOP=0, PdcDrawPoint=1, PdcDrawFirst=PdcDrawPoint, PdcMoveTo=2, PdcLineTo=3, PdcDrawLine=4, PdcDrawRect=5, PdcDrawRoundRect=6, PdcDrawEllipse=7, PdcDrawArc=8, PdcDrawPie=9, PdcDrawChord=10, PdcDrawLineSegments=11, PdcDrawPolyline=12, PdcDrawPolygon=13, PdcDrawQuadBezier=14, PdcDrawText=15, PdcDrawTextFormatted=16, PdcDrawPixmap=17, PdcDrawImage=18, PdcDrawText2=19, PdcDrawText2Formatted=20, PdcDrawLast=PdcDrawText2Formatted, PdcBegin=30, PdcEnd=31, PdcSave=32, PdcRestore=33, PdcSetdev=34, PdcSetBkColor=40, PdcSetBkMode=41, PdcSetROP=42, PdcSetBrushOrigin=43, PdcSetFont=45, PdcSetPen=46, PdcSetBrush=47, PdcSetTabStops=48, PdcSetTabArray=49, PdcSetUnit=50, PdcSetVXform=51, PdcSetWindow=52, PdcSetViewport=53, PdcSetWXform=54, PdcSetWMatrix=55, PdcSaveWMatrix=56, PdcRestoreWMatrix=57, PdcSetClip=60, PdcSetClipRegion=61, PdcReservedStart=0, PdcReservedStop=199}</div>
</ul>
<h2>Protected Members</h2>
<ul>
<li><div class="fn"><a href="#bfb403"><b>QPaintDevice</b></a>(uintdevflags)</div>
<li><div class="fn">virtualbool<a href="#4d4225"><b>cmd</b></a>(int, QPainter*, QPDevCmdParam*)</div>
<li><div class="fn">virtualint<a href="#43eff7"><b>metric</b></a>(int)const</div>
<li><div class="fn">virtualint<a href="#935a9c"><b>fontMet</b></a>(QFont*, int, constchar*=0, int=0)const</div>
<li><div class="fn">virtualint<a href="#269e25"><b>fontInf</b></a>(QFont*, int)const</div>
</ul>
<h2>Related Functions</h2>
(Note that these are not member functions.)
<ul>
<li>void <a href="qpaintdevice.html#35ae2e"><b>bitBlt</b></a> (QPaintDevice * dst, int dx, int dy, const QPaintDevice * src, int sx, int sy, int sw, int sh, Qt::RasterOp rop, bool ignoreMask)
<li>void <a href="qpaintdevice.html#61eee9"><b>bitBlt</b></a> (QPaintDevice * dst, const QPoint & dp, const QPaintDevice * src, const QRect & sr, RasterOp rop)
</ul>
<hr><h2><a name="details"></a>Detailed Description</h2>
The base class of objects that can be painted.
<p>
A paint device is an abstraction of a two-dimensional space that can be
drawn using a <a href="qpainter.html">QPainter</a>.
The drawing capabilities are implemented by the subclasses: <a href="qwidget.html">QWidget</a>,
<a href="qpixmap.html">QPixmap</a>, <a href="qpicture.html">QPicture</a> and <a href="qprinter.html">QPrinter</a>.
<p>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 downwards. The unit is one pixel. There are several ways
to set up a user-defined coordinate system using the painter, for
example by <a href="qpainter.html#862c4d">QPainter::setWorldMatrix</a>().
<p>Example (draw on a paint device):
<pre> void MyWidget::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * )
{
<a href="qpainter.html">QPainter</a> p; // our painter
p.<a href="qpainter.html#02ed5d">begin</a>( this ); // start painting widget
p.<a href="qpainter.html#0183e4">setPen</a>( red ); // blue outline
p.<a href="qpainter.html#3e0cc8">setBrush</a>( yellow ); // yellow fill
p.<a href="qpainter.html#f4ec3a">drawEllipse</a>( 10,20, 100,100 ); // 100x100 ellipse at 10,20
p.<a href="qpainter.html#365784">end</a>(); // painting done
}
</pre>
<p>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 <a href="#35ae2e">bitBlt</a>().
<p>Example (scroll widget contents 10 pixels to the right):
<pre> <a href="#35ae2e">bitBlt</a>( myWidget, 10,0, myWidget );
</pre>
<p><b>Warning:</b> Qt requires that a <a href="qapplication.html">QApplication</a> object must exist 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.
<hr><h2>Member Function Documentation</h2>
<h3 class="fn"><a name="bfb403"></a>QPaintDevice::QPaintDevice(uintdevflags) <code>[protected]</code></h3>
<p>Constructs a paint device with internal flags <em>devflags.</em>
This constructor can only be invoked from subclasses of QPaintDevice.
<h3 class="fn"><a name="b1caad"></a>QPaintDevice::~QPaintDevice() <code>[virtual]</code></h3>
<p>Destructs the paint device and frees window system resources.
<h3 class="fn">bool<a name="4d4225"></a>QPaintDevice::cmd(int, <a href="qpainter.html">QPainter</a>*, QPDevCmdParam*) <code>[virtualprotected]</code></h3>
<p>Internal virtual function that interprets drawing commands from
the painter.
<p>Implemented by subclasses that have no direct support for drawing
graphics (external paint devices, for example <a href="qpicture.html">QPicture</a>).
<p>Reimplemented in <a href="qprinter.html#1e8d9c">QPrinter</a> and <a href="qpicture.html#89362c">QPicture</a>.
<h3 class="fn">int<a name="754791"></a>QPaintDevice::devType()const</h3>
<p>Returns the device type identifier: <code>QInternal::Widget, QInternal::Pixmap, QInternal::Printer, QInternal::Picture</code> or
<code>QInternal::UndefinedDevice.</code>
<h3 class="fn">int<a name="269e25"></a>QPaintDevice::fontInf(<a href="qfont.html">QFont</a>*, int)const <code>[virtualprotected]</code></h3>
<p>Internal virtual function. Reserved for future use.
<h3 class="fn">int<a name="935a9c"></a>QPaintDevice::fontMet(<a href="qfont.html">QFont</a>*, int, constchar*=0, int=0)const <code>[virtualprotected]</code></h3>
<p>Internal virtual function. Reserved for future use.
<h3 class="fn">bool<a name="350135"></a>QPaintDevice::isExtDev()const</h3>
<p>Returns TRUE if the device is a so-called external paint device.
<p>External paint devices cannot be <a href="#35ae2e">bitBlt</a>()'ed from.
<a href="qpicture.html">QPicture</a> and <a href="qprinter.html">QPrinter</a> are external paint devices.
<h3 class="fn">int<a name="43eff7"></a>QPaintDevice::metric(int)const <code>[virtualprotected]</code></h3>
<p>Internal virtual function that returns paint device metrics.
<p>Please use the <a href="qpaintdevicemetrics.html">QPaintDeviceMetrics</a> class instead.
<p>Reimplemented in <a href="qpicture.html#1eba1e">QPicture</a>, <a href="qpixmap.html#fa32cf">QPixmap</a>, <a href="qwidget.html#f0e10e">QWidget</a> and <a href="qprinter.html#c4f6e2">QPrinter</a>.
<h3 class="fn">bool<a name="11c528"></a>QPaintDevice::paintingActive()const</h3>
<p>Returns TRUE if the device is being painted, i.e. someone has called
<a href="qpainter.html#02ed5d">QPainter::begin</a>() and not yet <a href="qpainter.html#365784">QPainter::end</a>() for this device.
<p>See also <a href="qpainter.html#08ba62">QPainter::isActive</a>().
<hr><h2>Related Functions</h2>
<h3>void <a name="35ae2e"></a>bitBlt (QPaintDevice * dst, int dx, int dy, const QPaintDevice * src, int sx, int sy, int sw, int sh, <a href="qt.html#RasterOp">Qt::RasterOp</a> rop, bool ignoreMask)</h3>
<p>This function copies a block of pixels from one paint device to another
(bitBlt means bit block transfer).
<p>Arguments:
<ul>
<li><em>dst</em> is the paint device to copy to.
<li><em>dx</em> and <em>dy</em> is the position to copy to.
<li><em>src</em> is the paint device to copy from.
<li><em>sx</em> and <em>sy</em> is the position to copy from.
<li><em>sw</em> and <em>sh</em> is the width and height of the block to be copied.
<li><em>rop</em> defines the raster operation to be used when copying.
</ul>
If <em>sw</em> is 0 or <em>sh</em> is 0, then bitBlt will do nothing.
<p>If <em>sw</em> is negative, then bitBlt calculates <code>sw = src->width -
sx.</code> If <em>sh</em> is negative, then bitBlt calculates <code>sh =
src->height - sy.</code>
<p>The <em>rop</em> argument can be one of:
<ul>
<li> <code>CopyROP:</code> dst = src.
<li> <code>OrROP:</code> dst = src OR dst.
<li> <code>XorROP:</code> dst = src XOR dst.
<li> <code>NotAndROP:</code> dst = (NOT src) AND dst
<li> <code>NotCopyROP:</code> dst = NOT src
<li> <code>NotOrROP:</code> dst = (NOT src) OR dst
<li> <code>NotXorROP:</code> dst = (NOT src) XOR dst
<li> <code>AndROP</code> dst = src AND dst
<li> <code>NotROP:</code> dst = NOT dst
<li> <code>ClearROP:</code> dst = 0
<li> <code>SetROP:</code> dst = 1
<li> <code>NopROP:</code> dst = dst
<li> <code>AndNotROP:</code> dst = src AND (NOT dst)
<li> <code>OrNotROP:</code> dst = src OR (NOT dst)
<li> <code>NandROP:</code> dst = NOT (src AND dst)
<li> <code>NorROP:</code> dst = NOT (src OR dst)
</ul>
<p>The <em>ignoreMask</em> argument (default FALSE) applies where <em>src</em> is
a <a href="qpixmap.html">QPixmap</a> with a <a href="qpixmap.html#68a75d">mask</a>.
If <em>ignoreMask</em> is TRUE, bitBlt ignores the pixmap's mask.
<p>BitBlt has two restrictions:
<ol>
<li> The <em>src</em> device must be <a href="qwidget.html">QWidget</a> or QPixmap. You cannot copy pixels
from a picture or a printer (external device).
<li> The <em>src</em> device may not have pixel depth greater than <em>dst.</em>
You cannot copy from an 8 bit pixmap to a 1 bit pixmap.
</ol>
<p>Examples:
<a href="xform-xform-cpp.html#bitBlt">xform/xform.cpp</a>
<a href="desktop-desktop-cpp.html#bitBlt">desktop/desktop.cpp</a>
<h3>void <a name="61eee9"></a>bitBlt (QPaintDevice * dst, const <a href="qpoint.html">QPoint</a> & dp, const QPaintDevice * src, const <a href="qrect.html">QRect</a> & sr, RasterOp rop)</h3>
<p>Overloaded <a href="qpaintdevice.html#35ae2e">bitBlt</a>() with the destination point <em>dp</em> and source rectangle
<em>sr.</em>
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