xform-xform-cpp.html

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    if ( shearVal >= 0 )
        tmp.<a name="insert"></a><a href="qstring.html#3ca271">insert</a>( 0, " " );
    shearLCD-&gt;<a href="qlcdnumber.html#ecdf88">display</a>( tmp );

    int rot = rotS-&gt;<a href="qslider.html#7b285c">value</a>();
    if ( rot &lt; 0 )
        rot = rot + 360;
    tmp.<a href="qstring.html#926f67">sprintf</a>( "%3i'", rot );
    rotLCD-&gt;<a href="qlcdnumber.html#ecdf88">display</a>( tmp );
    return m;
}

void <a name="366"></a>XFormControl::selectFont()
{
    bool ok;
    <a href="qfont.html">QFont</a> f = QFontDialog::getFont( &amp;ok, currentFont );
    if ( ok ) {
        currentFont = f;
        <a name="fontSelected"></a><a href="#367">fontSelected</a>( f );
    }
}

void <a name="367"></a>XFormControl::fontSelected( const QFont &amp;font )
{
    emit newFont( font );
    <a href=#368>changeMode</a>(Text);
}

/*
    Sets the mode - Text, Image, or Picture.
*/

void <a name="368"></a>XFormControl::changeMode(int m)
{
    mode = (Mode)m;

    emit newMode( m );
    <a name="newMtx"></a><a href="#363">newMtx</a>();
    if ( mode == Text ) {
        optionals-&gt;<a name="raiseWidget"></a><a href="qwidgetstack.html#08475e">raiseWidget</a>(0);
        rb_txt-&gt;<a href="qradiobutton.html#0e50fc">setChecked</a>(TRUE);
    } else {
        optionals-&gt;<a href="qwidgetstack.html#08475e">raiseWidget</a>(1);
        if ( mode == Image )
            rb_img-&gt;<a href="qradiobutton.html#0e50fc">setChecked</a>(TRUE);
        else
            rb_pic-&gt;<a href="qradiobutton.html#0e50fc">setChecked</a>(TRUE);
    }
    qApp-&gt;flushX();
}

ShowXForm::ShowXForm( const QFont &amp;initialFont,
                      <a href="qwidget.html">QWidget</a> *parent, const char *name )
        : <a href="qwidget.html">QWidget</a>( parent, name, WResizeNoErase )
{
    <a name="setFont"></a><a href="qwidget.html#090d60">setFont</a>( initialFont );
    <a name="setBackgroundColor"></a><a href="qwidget.html#c09181">setBackgroundColor</a>( white );
    m = Text;
    eraseRect = QRect( 0, 0, 0, 0 );
}

<a href="qsizepolicy.html">QSizePolicy</a> <a name="350"></a>ShowXForm::sizePolicy() const
{
    return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
}

<a href="qsize.html">QSize</a> <a name="351"></a>ShowXForm::sizeHint() const
{
    return QSize(400,400);
}

void <a name="352"></a>ShowXForm::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * )
{
    <a name="showIt"></a><a href="#360">showIt</a>();
}

void <a name="353"></a>ShowXForm::resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * )
{
    eraseRect = QRect( <a name="width"></a><a href="qwidget.html#2edab1">width</a>()/2, <a name="height"></a><a href="qwidget.html#e3c588">height</a>()/2, 0, 0 );
    <a name="repaint"></a><a href="qwidget.html#7569b1">repaint</a>(rect());
}

void <a name="354"></a>ShowXForm::setText( const QString&amp; s )
{
    text = s;
    <a href=#360>showIt</a>();
}

void <a name="355"></a>ShowXForm::setMatrix( <a href="qwmatrix.html">QWMatrix</a> w )
{
    mtx = w;
    <a href=#360>showIt</a>();
}

void <a name="356"></a>ShowXForm::setFont( const QFont &amp;f )
{
    m = Text;
    <a href="qwidget.html#090d60">QWidget::setFont</a>( f );
}

void <a name="357"></a>ShowXForm::setPixmap( <a href="qpixmap.html">QPixmap</a> pm )
{
    pix  = pm;
    m    = Image;
    <a href=#360>showIt</a>();
}

void <a name="358"></a>ShowXForm::setPicture( const QPicture&amp; p )
{
    picture = p;
    m = Picture;
    <a href=#360>showIt</a>();
}

void <a name="359"></a>ShowXForm::setMode( int mode )
{
    m = (Mode)mode;
}

void <a name="360"></a>ShowXForm::showIt()
{
    <a name="QPainter"></a><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 name="QFontMetrics"></a><a href="qfontmetrics.html">QFontMetrics</a> fm( <a name="fontMetrics"></a><a href="qwidget.html#386569">fontMetrics</a>() );   // get widget font metrics
    switch ( mode() ) {
      case Text:
        br = fm.<a name="boundingRect"></a><a href="qfontmetrics.html#b1cd55">boundingRect</a>( text );   // rectangle covering text
        r  = br;
        textYPos = -r.<a name="y"></a><a href="qrect.html#f448f7">y</a>();
        textXPos = -r.<a name="x"></a><a href="qrect.html#fccae7">x</a>();
        br.<a name="moveTopLeft"></a><a href="qrect.html#3b6044">moveTopLeft</a>( <a name="QPoint"></a><a href="qpoint.html">QPoint</a>( -br.<a name="width"></a><a href="qrect.html#45fe95">width</a>()/2, -br.<a name="height"></a><a href="qrect.html#581ab8">height</a>()/2 ) );
        break;
      case Image:
        r = pix.<a name="rect"></a><a href="qpixmap.html#fbdfe3">rect</a>();
        break;
      case Picture:
        // ### need QPicture::boundingRect()
        r = QRect(0,0,1000,1000);
        break;
    }
    r.<a href="qrect.html#3b6044">moveTopLeft</a>( <a href="qpoint.html">QPoint</a>(-r.<a href="qrect.html#45fe95">width</a>()/2, -r.<a href="qrect.html#581ab8">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
    eraseRect = eraseRect.<a name="unite"></a><a href="qrect.html#81e8a3">unite</a>( mtx.<a name="map"></a><a href="qwmatrix.html#83c725">map</a>(r) );
    eraseRect.<a name="moveBy"></a><a href="qrect.html#3de222">moveBy</a>( -1, -1 ); // add border for matrix round off
    eraseRect.<a name="setSize"></a><a href="qrect.html#94caa4">setSize</a>( <a href="qsize.html">QSize</a>( eraseRect.<a href="qrect.html#45fe95">width</a>() + 2,eraseRect.<a href="qrect.html#581ab8">height</a>() + 2 ) );
    int pw = QMIN(eraseRect.<a href="qrect.html#45fe95">width</a>(),<a href="qwidget.html#2edab1">width</a>());
    int ph = QMIN(eraseRect.<a href="qrect.html#581ab8">height</a>(),<a href="qwidget.html#e3c588">height</a>());
    <a href="qpixmap.html">QPixmap</a> pm( pw, ph );               // off-screen drawing pixmap
    pm.<a name="fill"></a><a href="qpixmap.html#6910a0">fill</a>( <a name="backgroundColor"></a><a href="qwidget.html#d5be64">backgroundColor</a>() );

    p.begin( &amp;pm );
    um.<a name="translate"></a><a href="qwmatrix.html#e4b716">translate</a>( pw/2, ph/2 ); // 0,0 is center
    um = mtx * um;
    p.setWorldMatrix( um );
    switch ( mode() ) {
      case Text:
        p.setFont( <a name="font"></a><a href="qwidget.html#167922">font</a>() );            // use widget font
        p.drawText( r.<a name="left"></a><a href="qrect.html#369cab">left</a>() + textXPos, r.<a name="top"></a><a href="qrect.html#4dd27e">top</a>() + textYPos, text );
#if 0
        p.setPen( red );
        p.drawRect( br );
#endif
        break;
      case Image:
        p.drawPixmap( -pix.<a name="width"></a><a href="qpixmap.html#86dbc5">width</a>()/2, -pix.<a name="height"></a><a href="qpixmap.html#d5bb33">height</a>()/2, pix );
        //QPixmap rotated = pix.<a name="xForm"></a><a href="qpixmap.html#ff5fcf">xForm</a>(mtx);
        //bitBlt( &amp;pm, pm.<a href="qpixmap.html#86dbc5">width</a>()/2 - rotated.width()/2,
                //pm.<a href="qpixmap.html#d5bb33">height</a>()/2 - rotated.height()/2, &amp;rotated );
        break;
      case Picture:
        // ### need QPicture::boundingRect()
        p.scale(0.25,0.25);
        p.translate(-230,-180);
        p.drawPicture( picture );
    }
    p.end();

    int xpos = width()/2  - pw/2;
    int ypos = height()/2 - ph/2;
    <a name="bitBlt"></a><a href="qpaintdevice.html#35ae2e">bitBlt</a>( this, xpos, ypos,                   // copy pixmap to widget
            &amp;pm, 0, 0, -1, -1 );
    eraseRect =  mtx.<a href="qwmatrix.html#83c725">map</a>( r );
}

/*
    Grand unifying widget, putting ShowXForm and XFormControl
    together.
*/

class XFormCenter : public QHBox, public ModeNames
{
    Q_OBJECT
public:
    XFormCenter( <a href="qwidget.html">QWidget</a> *parent=0, const char *name=0 );
public slots:
    void setFont( const QFont &amp;f ) { sx-&gt;<a href="qwidget.html#090d60">setFont</a>( f ); }
    void newMode( int );
private:
    ShowXForm   *sx;
    XFormControl *xc;
};

void <a name="361"></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;
        if ( pm.<a name="load"></a><a href="qpixmap.html#a728cf">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;
        if (p.<a name="load"></a><a href="qpicture.html#f0cc08">load</a>( "picture.any" ))
            sx-&gt;setPicture( p );
        return;
    }
    sx-&gt;setMode(m);
}

XFormCenter::XFormCenter( <a href="qwidget.html">QWidget</a> *parent, const char *name )
    : <a name="QHBox"></a><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 name="setStretchFactor"></a><a href="qhbox.html#8601c4">setStretchFactor</a>(sx,1);
    xc-&gt;<a name="setFrameStyle"></a><a href="qframe.html#558f79">setFrameStyle</a>( QFrame::Panel | QFrame::Raised );
    xc-&gt;<a name="setLineWidth"></a><a href="qframe.html#b76184">setLineWidth</a>( 2 );
    <a name="connect"></a><a href="qobject.html#fbde73">connect</a>( xc, SIGNAL(newText(const QString&amp;)), sx,
                 SLOT(setText(const QString&amp;)) );
    <a href="qobject.html#fbde73">connect</a>( xc, SIGNAL(newMatrix(<a href="qwmatrix.html">QWMatrix</a>)),
             sx, SLOT(setMatrix(<a href="qwmatrix.html">QWMatrix</a>)) );
    <a href="qobject.html#fbde73">connect</a>( xc, SIGNAL(newFont(const QFont&amp;)), sx,
                 SLOT(<a href="qwidget.html#090d60">setFont</a>(const QFont&amp;)) );
    <a href="qobject.html#fbde73">connect</a>( xc, SIGNAL(<a name="newMode"></a><a href="#361">newMode</a>(int)), SLOT(<a href=#361>newMode</a>(int)) );
    sx-&gt;setText( "Troll" );
    <a href=#361>newMode</a>( Image );
    sx-&gt;setMatrix(xc-&gt;matrix());
}

int main( int argc, char **argv )
{
    <a name="QApplication"></a><a href="qapplication.html">QApplication</a> a( argc, argv );

    XFormCenter *xfc = new XFormCenter;

    a.<a name="setMainWidget"></a><a href="qapplication.html#7ad759">setMainWidget</a>( xfc );
    xfc-&gt;<a name="setCaption"></a><a href="qwidget.html#d6a291">setCaption</a>("Qt Example - XForm");
    xfc-&gt;<a name="show"></a><a href="qwidget.html#200ee5">show</a>();
    return a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();
}

#include "xform.moc"                  // include metadata generated by the moc
</pre>
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