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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/xform/xform.doc:4 -->
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>Transformed Graphics Demo</title>
+<style type="text/css"><!--
+fn { margin-left: 1cm; text-indent: -1cm; }
+a:link { color: #004faf; text-decoration: none }
+a:visited { color: #672967; text-decoration: none }
+body { background: #ffffff; color: black; }
+--></style>
+</head>
+<body>
+
+<table border="0" cellpadding="0" cellspacing="0" width="100%">
+<tr bgcolor="#E5E5E5">
+<td valign=center>
+ <a href="index.html">
+<font color="#004faf">Home</font></a>
+ | <a href="classes.html">
+<font color="#004faf">All&nbsp;Classes</font></a>
+ | <a href="mainclasses.html">
+<font color="#004faf">Main&nbsp;Classes</font></a>
+ | <a href="annotated.html">
+<font color="#004faf">Annotated</font></a>
+ | <a href="groups.html">
+<font color="#004faf">Grouped&nbsp;Classes</font></a>
+ | <a href="functions.html">
+<font color="#004faf">Functions</font></a>
+</td>
+<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Transformed Graphics Demo</h1>
+
+
+<p>
+This example lets the user rotate, shear and scale text and graphics
+arbitrarily.
+<p> <hr>
+<p> Implementation:
+<p> <pre>/****************************************************************************
+** $Id: qt/xform.cpp 3.3.8 edited Jan 11 14:37 $
+**
+** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
+**
+** This file is part of an example program for Qt. This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
+
+#include &lt;<a href="qdialog-h.html">qdialog.h</a>&gt;
+#include &lt;<a href="qlabel-h.html">qlabel.h</a>&gt;
+#include &lt;<a href="qlineedit-h.html">qlineedit.h</a>&gt;
+#include &lt;<a href="qpushbutton-h.html">qpushbutton.h</a>&gt;
+#include &lt;<a href="qcheckbox-h.html">qcheckbox.h</a>&gt;
+#include &lt;<a href="qradiobutton-h.html">qradiobutton.h</a>&gt;
+#include &lt;<a href="qbuttongroup-h.html">qbuttongroup.h</a>&gt;
+#include &lt;<a href="qlcdnumber-h.html">qlcdnumber.h</a>&gt;
+#include &lt;<a href="qslider-h.html">qslider.h</a>&gt;
+#include &lt;<a href="qmenubar-h.html">qmenubar.h</a>&gt;
+#include &lt;<a href="qfontdialog-h.html">qfontdialog.h</a>&gt;
+#include &lt;<a href="qlayout-h.html">qlayout.h</a>&gt;
+#include &lt;<a href="qvbox-h.html">qvbox.h</a>&gt;
+#include &lt;<a href="qwidgetstack-h.html">qwidgetstack.h</a>&gt;
+
+#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
+#include &lt;<a href="qpixmap-h.html">qpixmap.h</a>&gt;
+#include &lt;<a href="qpicture-h.html">qpicture.h</a>&gt;
+
+#include &lt;stdlib.h&gt;
+
+
+class ModeNames {
+public:
+ enum Mode { Text, Image, Picture };
+};
+
+
+class XFormControl : public <a href="qvbox.html">QVBox</a>, public ModeNames
+{
+ <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
+public:
+ XFormControl( const <a href="qfont.html">QFont</a> &amp;initialFont, QWidget *parent=0, const char *name=0 );
+ ~XFormControl() {}
+
+ <a href="qwmatrix.html">QWMatrix</a> matrix();
+
+signals:
+ void newMatrix( <a href="qwmatrix.html">QWMatrix</a> );
+ void newText( const <a href="qstring.html">QString</a>&amp; );
+ void newFont( const <a href="qfont.html">QFont</a> &amp; );
+ void newMode( int );
+private slots:
+ void newMtx();
+ void newTxt(const <a href="qstring.html">QString</a>&amp;);
+ void selectFont();
+ void fontSelected( const <a href="qfont.html">QFont</a> &amp; );
+ void changeMode(int);
+ void timerEvent(QTimerEvent*);
+private:
+ Mode mode;
+ <a href="qslider.html">QSlider</a> *rotS; // Rotation angle scroll bar
+ <a href="qslider.html">QSlider</a> *shearS; // Shear value scroll bar
+ <a href="qslider.html">QSlider</a> *magS; // Magnification value scroll bar
+ <a href="qlcdnumber.html">QLCDNumber</a> *rotLCD; // Rotation angle LCD display
+ <a href="qlcdnumber.html">QLCDNumber</a> *shearLCD; // Shear value LCD display
+ <a href="qlcdnumber.html">QLCDNumber</a> *magLCD; // Magnification value LCD display
+ <a href="qcheckbox.html">QCheckBox</a> *mirror; // Checkbox for mirror image on/of
+ <a href="qwidgetstack.html">QWidgetStack</a>* optionals;
+ <a href="qlineedit.html">QLineEdit</a> *textEd; // Inp[ut field for xForm text
+ <a href="qpushbutton.html">QPushButton</a> *fpb; // Select font push button
+ <a href="qradiobutton.html">QRadioButton</a> *rb_txt; // Radio button for text
+ <a href="qradiobutton.html">QRadioButton</a> *rb_img; // Radio button for image
+ <a href="qradiobutton.html">QRadioButton</a> *rb_pic; // Radio button for picture
+ <a href="qfont.html">QFont</a> currentFont;
+};
+
+/*
+ ShowXForm displays a text or a pixmap (QPixmap) using a coordinate
+ <a href="qwmatrix.html#TransformationMode">transformation matrix</a> (QWMatrix)
+*/
+
+class ShowXForm : public <a href="qwidget.html">QWidget</a>, public ModeNames
+{
+ Q_OBJECT
+public:
+ ShowXForm( const <a href="qfont.html">QFont</a> &amp;f, QWidget *parent=0, const char *name=0 );
+ ~ShowXForm() {}
+ void showIt(); // (Re)displays text or pixmap
+
+ Mode mode() const { return m; }
+public slots:
+ void setText( const <a href="qstring.html">QString</a>&amp; );
+ void setMatrix( <a href="qwmatrix.html">QWMatrix</a> );
+ void setFont( const <a href="qfont.html">QFont</a> &amp;f );
+ void setPixmap( <a href="qpixmap.html">QPixmap</a> );
+ void setPicture( const <a href="qpicture.html">QPicture</a>&amp; );
+ void setMode( int );
+private:
+ <a href="qsizepolicy.html">QSizePolicy</a> sizePolicy() const;
+ <a href="qsize.html">QSize</a> sizeHint() const;
+ void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * );
+ void resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * );
+ <a href="qwmatrix.html">QWMatrix</a> mtx; // coordinate transform matrix
+ <a href="qstring.html">QString</a> text; // text to be displayed
+ <a href="qpixmap.html">QPixmap</a> pix; // pixmap to be displayed
+ <a href="qpicture.html">QPicture</a> picture; // text to be displayed
+ <a href="qrect.html">QRect</a> eraseRect; // covers last displayed text/pixmap
+ Mode m;
+};
+
+<a name="f397"></a>XFormControl::XFormControl( const <a href="qfont.html">QFont</a> &amp;initialFont,
+ <a href="qwidget.html">QWidget</a> *parent, const char *name )
+ : <a href="qvbox.html">QVBox</a>( parent, name )
+{
+ <a href="qhbox.html#setSpacing">setSpacing</a>(6);
+ <a href="qframe.html#setMargin">setMargin</a>(6);
+ currentFont = initialFont;
+ mode = Image;
+
+ rotLCD = new <a href="qlcdnumber.html">QLCDNumber</a>( 4, this, "rotateLCD" );
+ rotS = new <a href="qslider.html">QSlider</a>( QSlider::Horizontal, this,
+ "rotateSlider" );
+ shearLCD = new <a href="qlcdnumber.html">QLCDNumber</a>( 5,this, "shearLCD" );
+ shearS = new <a href="qslider.html">QSlider</a>( QSlider::Horizontal, this,
+ "shearSlider" );
+ mirror = new <a href="qcheckbox.html">QCheckBox</a>( this, "mirrorCheckBox" );
+ rb_txt = new <a href="qradiobutton.html">QRadioButton</a>( this, "text" );
+ rb_img = new <a href="qradiobutton.html">QRadioButton</a>( this, "image" );
+ rb_pic = new <a href="qradiobutton.html">QRadioButton</a>( this, "picture" );
+ optionals = new <a href="qwidgetstack.html">QWidgetStack</a>(this);
+ <a href="qvbox.html">QVBox</a>* optionals_text = new <a href="qvbox.html">QVBox</a>(optionals);
+<a name="x1228"></a> optionals_text-&gt;<a href="qhbox.html#setSpacing">setSpacing</a>(6);
+ <a href="qvbox.html">QVBox</a>* optionals_other = new <a href="qvbox.html">QVBox</a>(optionals);
+ optionals_other-&gt;<a href="qhbox.html#setSpacing">setSpacing</a>(6);
+<a name="x1276"></a> optionals-&gt;<a href="qwidgetstack.html#addWidget">addWidget</a>(optionals_text,0);
+ optionals-&gt;<a href="qwidgetstack.html#addWidget">addWidget</a>(optionals_other,1);
+ fpb = new <a href="qpushbutton.html">QPushButton</a>( optionals_text, "text" );
+ textEd = new <a href="qlineedit.html">QLineEdit</a>( optionals_text, "text" );
+ textEd-&gt;<a href="qwidget.html#setFocus">setFocus</a>();
+
+<a name="x1229"></a> rotLCD-&gt;<a href="qlcdnumber.html#display">display</a>( " 0'" );
+
+<a name="x1250"></a> rotS-&gt;<a href="qrangecontrol.html#setRange">setRange</a>( -180, 180 );
+<a name="x1261"></a> rotS-&gt;<a href="qslider.html#setValue">setValue</a>( 0 );
+<a name="x1263"></a> <a href="qobject.html#connect">connect</a>( rotS, SIGNAL(<a href="qslider.html#valueChanged">valueChanged</a>(int)), SLOT(newMtx()) );
+
+ shearLCD-&gt;<a href="qlcdnumber.html#display">display</a>( "0.00" );
+
+ shearS-&gt;<a href="qrangecontrol.html#setRange">setRange</a>( -25, 25 );
+ shearS-&gt;<a href="qslider.html#setValue">setValue</a>( 0 );
+ <a href="qobject.html#connect">connect</a>( shearS, SIGNAL(<a href="qslider.html#valueChanged">valueChanged</a>(int)), SLOT(newMtx()) );
+
+<a name="x1220"></a> mirror-&gt;<a href="qbutton.html#setText">setText</a>( <a href="qobject.html#tr">tr</a>("Mirror") );
+ <a href="qobject.html#connect">connect</a>( mirror, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), SLOT(newMtx()) );
+
+ <a href="qbuttongroup.html">QButtonGroup</a> *bg = new <a href="qbuttongroup.html">QButtonGroup</a>(this);
+<a name="x1267"></a> bg-&gt;<a href="qwidget.html#hide">hide</a>();
+<a name="x1222"></a> bg-&gt;<a href="qbuttongroup.html#insert">insert</a>(rb_txt,0);
+ bg-&gt;<a href="qbuttongroup.html#insert">insert</a>(rb_img,1);
+ bg-&gt;<a href="qbuttongroup.html#insert">insert</a>(rb_pic,2);
+ rb_txt-&gt;<a href="qbutton.html#setText">setText</a>( <a href="qobject.html#tr">tr</a>("Text") );
+ rb_img-&gt;<a href="qbutton.html#setText">setText</a>( <a href="qobject.html#tr">tr</a>("Image") );
+<a name="x1249"></a> rb_img-&gt;<a href="qradiobutton.html#setChecked">setChecked</a>(TRUE);
+ rb_pic-&gt;<a href="qbutton.html#setText">setText</a>( <a href="qobject.html#tr">tr</a>("Picture") );
+<a name="x1221"></a> <a href="qobject.html#connect">connect</a>( bg, SIGNAL(<a href="qbuttongroup.html#clicked">clicked</a>(int)), SLOT(changeMode(int)) );
+
+ fpb-&gt;<a href="qbutton.html#setText">setText</a>( <a href="qobject.html#tr">tr</a>("Select font...") );
+ <a href="qobject.html#connect">connect</a>( fpb, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), SLOT(selectFont()) );
+
+<a name="x1230"></a> textEd-&gt;<a href="qlineedit.html#setText">setText</a>( "Troll" );
+<a name="x1231"></a> <a href="qobject.html#connect">connect</a>( textEd, SIGNAL(<a href="qlineedit.html#textChanged">textChanged</a>(const <a href="qstring.html">QString</a>&amp;)),
+ SLOT(newTxt(const <a href="qstring.html">QString</a>&amp;)) );
+
+ magLCD = new <a href="qlcdnumber.html">QLCDNumber</a>( 4,optionals_other, "magLCD" );
+ magLCD-&gt;<a href="qlcdnumber.html#display">display</a>( "100" );
+ magS = new <a href="qslider.html">QSlider</a>( QSlider::Horizontal, optionals_other,
+ "magnifySlider" );
+ magS-&gt;<a href="qrangecontrol.html#setRange">setRange</a>( 0, 800 );
+ <a href="qobject.html#connect">connect</a>( magS, SIGNAL(<a href="qslider.html#valueChanged">valueChanged</a>(int)), SLOT(newMtx()) );
+ magS-&gt;<a href="qslider.html#setValue">setValue</a>( 0 );
+ <a href="qobject.html#connect">connect</a>( magS, SIGNAL(<a href="qslider.html#valueChanged">valueChanged</a>(int)), magLCD, SLOT(<a href="qlcdnumber.html#display">display</a>(int)));
+
+<a name="x1266"></a> optionals_text-&gt;<a href="qwidget.html#adjustSize">adjustSize</a>();
+ optionals_other-&gt;<a href="qwidget.html#adjustSize">adjustSize</a>();
+ changeMode(Image);
+
+ <a href="qobject.html#startTimer">startTimer</a>(20); // start an initial animation
+}
+
+<a name="x1232"></a>void XFormControl::<a href="qobject.html#timerEvent">timerEvent</a>(QTimerEvent*)
+{
+<a name="x1262"></a> int v = magS-&gt;<a href="qslider.html#value">value</a>();
+ v = (v+2)+v/10;
+ if ( v &gt;= 200 ) {
+ v = 200;
+ <a href="qobject.html#killTimers">killTimers</a>();
+ }
+ magS-&gt;<a href="qslider.html#setValue">setValue</a>(v);
+}
+
+
+
+/*
+ Called whenever the user has changed one of the matrix parameters
+ (i.e. rotate, shear or magnification)
+*/
+void <a name="f398"></a>XFormControl::newMtx()
+{
+ emit newMatrix( matrix() );
+}
+
+void <a name="f399"></a>XFormControl::newTxt(const <a href="qstring.html">QString</a>&amp; s)
+{
+ emit newText(s);
+ changeMode(Text);
+}
+
+/*
+ Calculates the matrix appropriate for the current controls,
+ and updates the displays.
+*/
+QWMatrix <a name="f400"></a>XFormControl::matrix()
+{
+ <a href="qwmatrix.html">QWMatrix</a> m;
+ if (mode != Text) {
+ double magVal = 1.0*magS-&gt;<a href="qslider.html#value">value</a>()/100;
+<a name="x1281"></a> m.<a href="qwmatrix.html#scale">scale</a>( magVal, magVal );
+ }
+ double shearVal = 1.0*shearS-&gt;<a href="qslider.html#value">value</a>()/25;
+<a name="x1282"></a> m.<a href="qwmatrix.html#shear">shear</a>( shearVal, shearVal );
+<a name="x1280"></a> m.<a href="qwmatrix.html#rotate">rotate</a>( rotS-&gt;<a href="qslider.html#value">value</a>() );
+<a name="x1223"></a> if ( mirror-&gt;<a href="qcheckbox.html#isChecked">isChecked</a>() ) {
+ m.<a href="qwmatrix.html#scale">scale</a>( 1, -1 );
+ m.<a href="qwmatrix.html#rotate">rotate</a>( 180 );
+ }
+
+ <a href="qstring.html">QString</a> tmp;
+<a name="x1265"></a> tmp.<a href="qstring.html#sprintf">sprintf</a>( "%1.2f", shearVal );
+ if ( shearVal &gt;= 0 )
+<a name="x1264"></a> tmp.<a href="qstring.html#insert">insert</a>( 0, " " );
+ shearLCD-&gt;<a href="qlcdnumber.html#display">display</a>( tmp );
+
+ int rot = rotS-&gt;<a href="qslider.html#value">value</a>();
+ if ( rot &lt; 0 )
+ rot = rot + 360;
+ tmp.<a href="qstring.html#sprintf">sprintf</a>( "%3i'", rot );
+ rotLCD-&gt;<a href="qlcdnumber.html#display">display</a>( tmp );
+ return m;
+}
+
+
+void <a name="f401"></a>XFormControl::selectFont()
+{
+ bool ok;
+<a name="x1224"></a> <a href="qfont.html">QFont</a> f = QFontDialog::<a href="qfontdialog.html#getFont">getFont</a>( &amp;ok, currentFont );
+ if ( ok ) {
+ currentFont = f;
+ fontSelected( f );
+ }
+}
+
+void <a name="f402"></a>XFormControl::fontSelected( const <a href="qfont.html">QFont</a> &amp;font )
+{
+ emit newFont( font );
+ changeMode(Text);
+}
+
+/*
+ Sets the mode - Text, Image, or Picture.
+*/
+
+void <a name="f403"></a>XFormControl::changeMode(int m)
+{
+ mode = (Mode)m;
+
+ emit newMode( m );
+ newMtx();
+ if ( mode == Text ) {
+<a name="x1277"></a> optionals-&gt;<a href="qwidgetstack.html#raiseWidget">raiseWidget</a>(0);
+ rb_txt-&gt;<a href="qradiobutton.html#setChecked">setChecked</a>(TRUE);
+ } else {
+ optionals-&gt;<a href="qwidgetstack.html#raiseWidget">raiseWidget</a>(1);
+ if ( mode == Image )
+ rb_img-&gt;<a href="qradiobutton.html#setChecked">setChecked</a>(TRUE);
+ else
+ rb_pic-&gt;<a href="qradiobutton.html#setChecked">setChecked</a>(TRUE);
+ }
+<a name="x1217"></a> qApp-&gt;<a href="qapplication.html#flushX">flushX</a>();
+}
+
+<a name="f388"></a>ShowXForm::ShowXForm( const <a href="qfont.html">QFont</a> &amp;initialFont,
+ <a href="qwidget.html">QWidget</a> *parent, const char *name )
+ : <a href="qwidget.html">QWidget</a>( parent, name, WResizeNoErase )
+{
+ <a href="qwidget.html#setFont">setFont</a>( initialFont );
+ <a href="qwidget.html#setBackgroundColor">setBackgroundColor</a>( white );
+ m = Text;
+ eraseRect = QRect( 0, 0, 0, 0 );
+}
+
+<a name="x1275"></a>QSizePolicy ShowXForm::<a href="qwidget.html#sizePolicy">sizePolicy</a>() const
+{
+ return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
+}
+
+<a name="x1274"></a>QSize ShowXForm::<a href="qwidget.html#sizeHint">sizeHint</a>() const
+{
+ return QSize(400,400);
+}
+
+void ShowXForm::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * )
+{
+ showIt();
+}
+
+<a name="x1269"></a>void ShowXForm::<a href="qwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">QResizeEvent</a> * )
+{
+ eraseRect = QRect( <a href="qwidget.html#width">width</a>()/2, height()/2, 0, 0 );
+ <a href="qwidget.html#repaint">repaint</a>(<a href="qwidget.html#rect">rect</a>());
+}
+
+void <a name="f389"></a>ShowXForm::setText( const <a href="qstring.html">QString</a>&amp; s )
+{
+ text = s;
+ showIt();
+}
+
+void <a name="f390"></a>ShowXForm::setMatrix( <a href="qwmatrix.html">QWMatrix</a> w )
+{
+ mtx = w;
+ showIt();
+}
+
+<a name="x1272"></a>void ShowXForm::<a href="qwidget.html#setFont">setFont</a>( const <a href="qfont.html">QFont</a> &amp;f )
+{
+ m = Text;
+ QWidget::<a href="qwidget.html#setFont">setFont</a>( f );
+}
+
+void <a name="f391"></a>ShowXForm::setPixmap( <a href="qpixmap.html">QPixmap</a> pm )
+{
+ pix = pm;
+ m = Image;
+ showIt();
+}
+
+void <a name="f392"></a>ShowXForm::setPicture( const <a href="qpicture.html">QPicture</a>&amp; p )
+{
+ picture = p;
+ m = Picture;
+ showIt();
+}
+
+void <a name="f393"></a>ShowXForm::setMode( int mode )
+{
+ m = (Mode)mode;
+}
+
+void <a name="f394"></a>ShowXForm::showIt()
+{
+ <a href="qpainter.html">QPainter</a> p;
+ <a href="qrect.html">QRect</a> r; // rectangle covering new text/pixmap in virtual coordinates
+ <a href="qwmatrix.html">QWMatrix</a> um; // copy user specified transform
+ int textYPos = 0; // distance from boundingRect y pos to baseline
+ int textXPos = 0; // distance from boundingRect x pos to text start
+ <a href="qrect.html">QRect</a> br;
+ <a href="qfontmetrics.html">QFontMetrics</a> fm( <a href="qwidget.html#fontMetrics">fontMetrics</a>() ); // get widget font metrics
+ switch ( mode() ) {
+ case Text:
+<a name="x1225"></a> br = fm.<a href="qfontmetrics.html#boundingRect">boundingRect</a>( text ); // rectangle covering text
+ r = br;
+ textYPos = -r.<a href="qrect.html#y">y</a>();
+ textXPos = -r.<a href="qrect.html#x">x</a>();
+<a name="x1258"></a><a name="x1254"></a><a name="x1251"></a> br.<a href="qrect.html#moveTopLeft">moveTopLeft</a>( QPoint( -br.<a href="qrect.html#width">width</a>()/2, -br.<a href="qrect.html#height">height</a>()/2 ) );
+ break;
+ case Image:
+<a name="x1248"></a><a name="x1246"></a> r = QRect(0, 0, pix.<a href="qpixmap.html#width">width</a>()+1, pix.<a href="qpixmap.html#height">height</a>()+1);
+ break;
+ case Picture:
+ // ### need QPicture::boundingRect()
+ r = QRect(0,0,1000,1000);
+ break;
+ }
+ r.<a href="qrect.html#moveTopLeft">moveTopLeft</a>( QPoint(-r.<a href="qrect.html#width">width</a>()/2, -r.<a href="qrect.html#height">height</a>()/2) );
+<a name="x1253"></a> r.<a href="qrect.html#moveBy">moveBy</a>( -1, -1 ); // add border for matrix round off
+<a name="x1255"></a> r.<a href="qrect.html#setSize">setSize</a>( QSize( r.<a href="qrect.html#width">width</a>() + 2,r.<a href="qrect.html#height">height</a>() + 2 ) );
+ // compute union of new and old rect
+ // the resulting rectangle will cover what is already displayed
+ // and have room for the new text/pixmap
+<a name="x1279"></a><a name="x1257"></a> eraseRect = eraseRect.<a href="qrect.html#unite">unite</a>( mtx.<a href="qwmatrix.html#mapRect">mapRect</a>(r) );
+ int pw = QMIN(eraseRect.<a href="qrect.html#width">width</a>(),width());
+ int ph = QMIN(eraseRect.<a href="qrect.html#height">height</a>(),height());
+ <a href="qpixmap.html">QPixmap</a> pm( pw, ph ); // off-screen drawing pixmap
+<a name="x1245"></a> pm.<a href="qpixmap.html#fill">fill</a>( <a href="qwidget.html#backgroundColor">backgroundColor</a>() );
+
+<a name="x1233"></a> p.<a href="qpainter.html#begin">begin</a>( &amp;pm );
+<a name="x1283"></a> um.<a href="qwmatrix.html#translate">translate</a>( pw/2, ph/2 ); // 0,0 is center
+ um = mtx * um;
+<a name="x1242"></a> p.<a href="qpainter.html#setWorldMatrix">setWorldMatrix</a>( um );
+ switch ( mode() ) {
+ case Text:
+<a name="x1240"></a> p.<a href="qpainter.html#setFont">setFont</a>( <a href="qwidget.html#font">font</a>() ); // use widget font
+<a name="x1256"></a><a name="x1252"></a> p.<a href="qpainter.html#drawText">drawText</a>( r.<a href="qrect.html#left">left</a>() + textXPos, r.<a href="qrect.html#top">top</a>() + textYPos, text );
+#if 0
+ p.<a href="qpainter.html#setPen">setPen</a>( red );
+ p.<a href="qpainter.html#drawRect">drawRect</a>( br );
+#endif
+ break;
+ case Image:
+<a name="x1235"></a> p.<a href="qpainter.html#drawPixmap">drawPixmap</a>( -pix.<a href="qpixmap.html#width">width</a>()/2, -pix.<a href="qpixmap.html#height">height</a>()/2, pix );
+ break;
+ case Picture:
+ // ### need QPicture::boundingRect()
+<a name="x1239"></a> p.<a href="qpainter.html#scale">scale</a>(0.25,0.25);
+<a name="x1243"></a> p.<a href="qpainter.html#translate">translate</a>(-230,-180);
+<a name="x1234"></a> p.<a href="qpainter.html#drawPicture">drawPicture</a>( picture );
+ }
+<a name="x1238"></a> p.<a href="qpainter.html#end">end</a>();
+
+ int xpos = <a href="qwidget.html#width">width</a>()/2 - pw/2;
+ int ypos = <a href="qwidget.html#height">height</a>()/2 - ph/2;
+ <a href="qimage.html#bitBlt">bitBlt</a>( this, xpos, ypos, // copy pixmap to widget
+ &amp;pm, 0, 0, -1, -1 );
+<a name="x1278"></a> eraseRect = mtx.<a href="qwmatrix.html#map">map</a>( r );
+}
+
+
+/*
+ Grand unifying widget, putting ShowXForm and XFormControl
+ together.
+*/
+
+class XFormCenter : public <a href="qhbox.html">QHBox</a>, public ModeNames
+{
+ Q_OBJECT
+public:
+ XFormCenter( <a href="qwidget.html">QWidget</a> *parent=0, const char *name=0 );
+public slots:
+ void setFont( const <a href="qfont.html">QFont</a> &amp;f ) { sx-&gt;<a href="qwidget.html#setFont">setFont</a>( f ); }
+ void newMode( int );
+private:
+ ShowXForm *sx;
+ XFormControl *xc;
+};
+
+void <a name="f395"></a>XFormCenter::newMode( int m )
+{
+ static bool first_i = TRUE;
+ static bool first_p = TRUE;
+
+ if ( sx-&gt;mode() == m )
+ return;
+ if ( m == Image &amp;&amp; first_i ) {
+ first_i = FALSE;
+ <a href="qpixmap.html">QPixmap</a> pm;
+<a name="x1247"></a> if ( pm.<a href="qpixmap.html#load">load</a>( "image.any" ) )
+ sx-&gt;setPixmap( pm );
+ return;
+ }
+ if ( m == Picture &amp;&amp; first_p ) {
+ first_p = FALSE;
+ <a href="qpicture.html">QPicture</a> p;
+<a name="x1244"></a> if (p.<a href="qpicture.html#load">load</a>( "picture.any" ))
+ sx-&gt;setPicture( p );
+ return;
+ }
+ sx-&gt;setMode(m);
+}
+
+<a name="f396"></a>XFormCenter::XFormCenter( <a href="qwidget.html">QWidget</a> *parent, const char *name )
+ : <a href="qhbox.html">QHBox</a>( parent, name )
+{
+ <a href="qfont.html">QFont</a> f( "Charter", 36, QFont::Bold );
+
+ xc = new XFormControl( f, this );
+ sx = new ShowXForm( f, this );
+ <a href="qhbox.html#setStretchFactor">setStretchFactor</a>(sx,1);
+ xc-&gt;<a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::Panel | QFrame::Raised );
+<a name="x1227"></a> xc-&gt;<a href="qframe.html#setLineWidth">setLineWidth</a>( 2 );
+ <a href="qobject.html#connect">connect</a>( xc, SIGNAL(newText(const <a href="qstring.html">QString</a>&amp;)), sx,
+ SLOT(setText(const <a href="qstring.html">QString</a>&amp;)) );
+ <a href="qobject.html#connect">connect</a>( xc, SIGNAL(newMatrix(QWMatrix)),
+ sx, SLOT(setMatrix(QWMatrix)) );
+ <a href="qobject.html#connect">connect</a>( xc, SIGNAL(newFont(const <a href="qfont.html">QFont</a>&amp;)), sx,
+ SLOT(<a href="qwidget.html#setFont">setFont</a>(const <a href="qfont.html">QFont</a>&amp;)) );
+ <a href="qobject.html#connect">connect</a>( xc, SIGNAL(newMode(int)), SLOT(newMode(int)) );
+ sx-&gt;setText( "Troll" );
+ newMode( Image );
+ sx-&gt;setMatrix(xc-&gt;matrix());
+}
+
+
+int main( int argc, char **argv )
+{
+ <a href="qapplication.html">QApplication</a> a( argc, argv );
+
+ XFormCenter *xfc = new XFormCenter;
+
+ a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( xfc );
+ xfc-&gt;<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - XForm");
+ xfc-&gt;<a href="qwidget.html#show">show</a>();
+ return a.<a href="qapplication.html#exec">exec</a>();
+}
+
+#include "xform.moc" // include metadata generated by the <a href="moc.html#moc">moc</a>
+</pre>
+
+<p>See also <a href="examples.html">Examples</a>.
+
+<!-- eof -->
+<p><address><hr><div align=center>
+<table width=100% cellspacing=0 border=0><tr>
+<td>Copyright &copy; 2007
+<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
+<td align=right><div align=right>Qt 3.3.8</div>
+</table></div></address></body>
+</html>