xform-example.html

QT 下载资料仅供参考

    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="f444"></a>XFormControl::selectFont()
{
    bool ok;
<a name="x1423"></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="f445"></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="f446"></a>XFormControl::changeMode(int m)
{
    mode = (Mode)m;

    emit newMode( m );
    newMtx();
    if ( mode == Text ) {
<a name="x1478"></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="x1416"></a>    qApp-&gt;<a href="qapplication.html#flushX">flushX</a>();
}

<a name="f431"></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="x1476"></a>QSizePolicy ShowXForm::<a href="qwidget.html#sizePolicy">sizePolicy</a>() const
{
    return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
}

<a name="x1475"></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();
}

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="f432"></a>ShowXForm::setText( const <a href="qstring.html">QString</a>&amp; s )
{
    text = s;
    showIt();
}

void <a name="f433"></a>ShowXForm::setMatrix( <a href="qwmatrix.html">QWMatrix</a> w )
{
    mtx = w;
    showIt();
}

<a name="x1473"></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="f434"></a>ShowXForm::setPixmap( <a href="qpixmap.html">QPixmap</a> pm )
{
    pix  = pm;
    m    = Image;
    showIt();
}

void <a name="f435"></a>ShowXForm::setPicture( const <a href="qpicture.html">QPicture</a>&amp; p )
{
    picture = p;
    m = Picture;
    showIt();
}

void <a name="f436"></a>ShowXForm::setMode( int mode )
{
    m = (Mode)mode;
}

void <a name="f437"></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="x1424"></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="x1459"></a><a name="x1455"></a><a name="x1452"></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="x1447"></a>        r = pix.<a href="qpixmap.html#rect">rect</a>();
        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) );
          // 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="x1479"></a><a name="x1458"></a>    eraseRect = eraseRect.<a href="qrect.html#unite">unite</a>( mtx.<a href="qwmatrix.html#map">map</a>(r) );
<a name="x1454"></a>    eraseRect.<a href="qrect.html#moveBy">moveBy</a>( -1, -1 ); // add border for matrix round off
<a name="x1456"></a>    eraseRect.<a href="qrect.html#setSize">setSize</a>( QSize( eraseRect.<a href="qrect.html#width">width</a>() + 2,eraseRect.<a href="qrect.html#height">height</a>() + 2 ) );
    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="x1444"></a>    pm.<a href="qpixmap.html#fill">fill</a>( <a href="qwidget.html#backgroundColor">backgroundColor</a>() );

<a name="x1432"></a>    p.<a href="qpainter.html#begin">begin</a>( &amp;pm );
<a name="x1483"></a>    um.<a href="qwmatrix.html#translate">translate</a>( pw/2, ph/2 ); // 0,0 is center
    um = mtx * um;
<a name="x1441"></a>    p.<a href="qpainter.html#setWorldMatrix">setWorldMatrix</a>( um );
    switch ( mode() ) {
      case Text:
<a name="x1439"></a>        p.<a href="qpainter.html#setFont">setFont</a>( <a href="qwidget.html#font">font</a>() );            // use widget font
<a name="x1457"></a><a name="x1453"></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="x1448"></a><a name="x1445"></a><a name="x1434"></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 );
<a name="x1449"></a>        //QPixmap rotated = pix.<a href="qpixmap.html#xForm">xForm</a>(mtx);
        //bitBlt( &amp;pm, pm.<a href="qpixmap.html#width">width</a>()/2 - rotated.width()/2,
                //pm.<a href="qpixmap.html#height">height</a>()/2 - rotated.height()/2, &amp;rotated );
        break;
      case Picture:
        // ### need QPicture::boundingRect()
<a name="x1438"></a>        p.<a href="qpainter.html#scale">scale</a>(0.25,0.25);
<a name="x1442"></a>        p.<a href="qpainter.html#translate">translate</a>(-230,-180);
<a name="x1433"></a>        p.<a href="qpainter.html#drawPicture">drawPicture</a>( picture );
    }
<a name="x1437"></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="qpaintdevice.html#bitBlt-2">bitBlt</a>( this, xpos, ypos,                   // copy pixmap to widget
            &amp;pm, 0, 0, -1, -1 );
    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="f438"></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="x1446"></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="x1443"></a>        if (p.<a href="qpicture.html#load">load</a>( "picture.any" ))
            sx-&gt;setPicture( p );
        return;
    }
    sx-&gt;setMode(m);
}

<a name="f439"></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="x1426"></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>.

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<table width=100% cellspacing=0 border=0><tr>
<td>Copyright &copy; 2002 
<a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt version 3.0.5</div>
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