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Qt Toolkit - qmag/qmag.cpp example file
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<h1 align=center>QMag</h1><br clear="all">

  This is a simple magnifier-type program.  It shows how one can do
  some quite low-level operations portably using Qt.

  Run it, click in the magnifier window, then click where you want to
  magnify or drag out a rectangle.  Two combo boxes let you select
  amplification and refresh frequency, a text label tells you the color
  of the pixel the cursor is on, and a button lets you save the
  magnified area as a .bmp file.

  <hr>

  Implementation:
<pre>/****************************************************************************
** &#36;Id&#58; qt/examples/qmag/qmag.cpp   2.3.2   edited 2001-01-26 $
**
** Copyright (C) 1992-2000 Trolltech AS.  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 name="qcombobox.h"></a><a href="qcombobox-h.html">qcombobox.h</a>&gt;
#include &lt;<a name="qpushbutton.h"></a><a href="qpushbutton-h.html">qpushbutton.h</a>&gt;
#include &lt;<a name="qpixmap.h"></a><a href="qpixmap-h.html">qpixmap.h</a>&gt;
#include &lt;<a name="qimage.h"></a><a href="qimage-h.html">qimage.h</a>&gt;
#include &lt;<a name="qlabel.h"></a><a href="qlabel-h.html">qlabel.h</a>&gt;
#include &lt;<a name="qfiledialog.h"></a><a href="qfiledialog-h.html">qfiledialog.h</a>&gt;
#include &lt;<a name="qregexp.h"></a><a href="qregexp-h.html">qregexp.h</a>&gt;

#include &lt;<a name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a name="qpainter.h"></a><a href="qpainter-h.html">qpainter.h</a>&gt;
#include &lt;<a name="qwmatrix.h"></a><a href="qwmatrix-h.html">qwmatrix.h</a>&gt;

class MagWidget : public QWidget
{
    Q_OBJECT
public:
    MagWidget( <a name="QWidget"></a><a href="qwidget.html">QWidget</a> *parent=0, const char *name=0 );

public slots:
    void        setZoom( int );
    void        setRefresh( int );
    void        save();
    void        multiSave();

protected:
    void        paintEvent( <a name="QPaintEvent"></a><a href="qpaintevent.html">QPaintEvent</a> * );
    void        mousePressEvent( <a name="QMouseEvent"></a><a href="qmouseevent.html">QMouseEvent</a> * );
    void        mouseReleaseEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
    void        mouseMoveEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
    void        focusOutEvent( <a name="QFocusEvent"></a><a href="qfocusevent.html">QFocusEvent</a> * );
    void        timerEvent( <a name="QTimerEvent"></a><a href="qtimerevent.html">QTimerEvent</a> * );
    void        resizeEvent( <a name="QResizeEvent"></a><a href="qresizeevent.html">QResizeEvent</a> * );

private:
    void        grabAround(<a name="QPoint"></a><a href="qpoint.html">QPoint</a> pos);
    void        grab();

    <a name="QComboBox"></a><a href="qcombobox.html">QComboBox</a>   *zoom;
    <a href="qcombobox.html">QComboBox</a>   *refresh;
    <a name="QPushButton"></a><a href="qpushbutton.html">QPushButton</a> *saveButton;
    <a href="qpushbutton.html">QPushButton</a> *multiSaveButton;
    <a href="qpushbutton.html">QPushButton</a> *quitButton;
    <a name="QPixmap"></a><a href="qpixmap.html">QPixmap</a>     pm;             // pixmap, magnified
    <a href="qpixmap.html">QPixmap</a>     p;              // pixmap
    <a name="QImage"></a><a href="qimage.html">QImage</a>      image;          // image of pixmap (for RGB)
    <a name="QLabel"></a><a href="qlabel.html">QLabel</a>      *rgb;
    int         yoffset;        // pixels in addition to the actual picture
    int         z;              // magnification factor
    int         r;              // autorefresh rate (index into refreshrates)
    bool        grabbing;       // TRUE if qmag is currently grabbing
    int         grabx, graby;
    <a name="QString"></a><a href="qstring.html">QString</a>     multifn;        // filename for multisave
};

#ifdef COMPLEX_GUI
static const char *zoomfactors[] = {
    "100%", "200%", "300%", "400%", "500%",
    "600%", "700%", "800%", "1600%", 0 };

static const char *refreshrates[] = {
    "No autorefresh", "50 per second", "4 per second", "3 per second", "2 per second",
    "Every second", "Every two seconds", "Every three seconds",
    "Every five seconds", "Every ten seconds", 0 };
#endif

static const int timer[] = {
    0, 20, 250, 333, 500, 1000, 2000, 3000, 5000, 10000 };

MagWidget::MagWidget( <a href="qwidget.html">QWidget</a> *parent, const char *name )
    : <a href="qwidget.html">QWidget</a>( parent, name)
{
    z = 1;                      // default zoom (100%)
    r = 0;                      // default refresh (none)

#ifdef COMPLEX_GUI
    int w=0, x=0, n;

    zoom = new <a href="qcombobox.html">QComboBox</a>( FALSE, this );
    CHECK_PTR(zoom);
    zoom-&gt;<a name="insertStrList"></a><a href="qcombobox.html#ae9e6b">insertStrList</a>( zoomfactors, 9 );
    <a name="connect"></a><a href="qobject.html#7f8e37">connect</a>( zoom, SIGNAL(activated(int)), SLOT(<a name="setZoom"></a><a href="#290">setZoom</a>(int)) );

    refresh = new <a href="qcombobox.html">QComboBox</a>( FALSE, this );
    CHECK_PTR(refresh);
    refresh-&gt;<a href="qcombobox.html#ae9e6b">insertStrList</a>( refreshrates, 9 );
    <a href="qobject.html#7f8e37">connect</a>( refresh, SIGNAL(activated(int)), SLOT(<a name="setRefresh"></a><a href="#291">setRefresh</a>(int)) );

    for( n=0; n&lt;9; n++) {
        int w2 = zoom-&gt;<a name="fontMetrics"></a><a href="qwidget.html#386569">fontMetrics</a>().width( zoomfactors[n] );
        w = QMAX(w2, w);
    }
    zoom-&gt;<a name="setGeometry"></a><a href="qwidget.html#5e9ab1">setGeometry</a>( 2, 2, w+30, 20 );

    x = w+34;
    w = 0;
    for( n=0; n&lt;9; n++) {
        int w2 = refresh-&gt;<a href="qwidget.html#386569">fontMetrics</a>().width( refreshrates[n] );
        w = QMAX(w2, w);
    }
    refresh-&gt;<a href="qwidget.html#5e9ab1">setGeometry</a>( x, 2, w+30, 20 );

    saveButton = new <a href="qpushbutton.html">QPushButton</a>( this );
    CHECK_PTR(saveButton);
    <a href="qobject.html#7f8e37">connect</a>( saveButton, SIGNAL(clicked()), this, SLOT(<a name="save"></a><a href="#292">save</a>()) );
    saveButton-&gt;<a name="setText"></a><a href="qbutton.html#989f4f">setText</a>( "Save" );
    saveButton-&gt;<a name="setGeometry"></a><a href="qpushbutton.html#c9b88e">setGeometry</a>( x+w+30+2, 2,
                             10+saveButton-&gt;<a href="qwidget.html#386569">fontMetrics</a>().width("Save"), 20 );

    multiSaveButton = new <a href="qpushbutton.html">QPushButton</a>( this );
    multiSaveButton-&gt;<a name="setToggleButton"></a><a href="qpushbutton.html#cf550e">setToggleButton</a>(TRUE);
    CHECK_PTR(multiSaveButton);
    <a href="qobject.html#7f8e37">connect</a>( multiSaveButton, SIGNAL(clicked()), this, SLOT(<a name="multiSave"></a><a href="#293">multiSave</a>()) );
    multiSaveButton-&gt;<a href="qbutton.html#989f4f">setText</a>( "MultiSave" );
    multiSaveButton-&gt;<a href="qpushbutton.html#c9b88e">setGeometry</a>( saveButton-&gt;<a name="geometry"></a><a href="qwidget.html#e515c8">geometry</a>().right() + 2, 2,
                             10+multiSaveButton-&gt;<a href="qwidget.html#386569">fontMetrics</a>().width("MultiSave"), 20 );

    quitButton = new <a href="qpushbutton.html">QPushButton</a>( this );
    CHECK_PTR(quitButton);
    <a href="qobject.html#7f8e37">connect</a>( quitButton, SIGNAL(clicked()), qApp, SLOT(quit()) );
    quitButton-&gt;<a href="qbutton.html#989f4f">setText</a>( "Quit" );
    quitButton-&gt;<a href="qpushbutton.html#c9b88e">setGeometry</a>( multiSaveButton-&gt;<a href="qwidget.html#e515c8">geometry</a>().right() + 2, 2,
                             10+quitButton-&gt;<a href="qwidget.html#386569">fontMetrics</a>().width("Quit"), 20 );
#else
    zoom = 0;
    multiSaveButton = 0;
#endif

    <a href=#291>setRefresh</a>(1);
    <a href=#290>setZoom</a>(5);

    rgb = new <a href="qlabel.html">QLabel</a>( this );
    CHECK_PTR( rgb );
    rgb-&gt;<a name="setText"></a><a href="qlabel.html#bc5ea6">setText</a>( "" );
    rgb-&gt;<a name="setAlignment"></a><a href="qlabel.html#4743c8">setAlignment</a>( AlignVCenter );
    rgb-&gt;<a name="resize"></a><a href="qwidget.html#ff9d07">resize</a>( <a name="width"></a><a href="qwidget.html#2edab1">width</a>(), rgb-&gt;<a href="qwidget.html#386569">fontMetrics</a>().height() + 4 );

#ifdef COMPLEX_GUI
    yoffset = zoom-&gt;<a name="height"></a><a href="qwidget.html#e3c588">height</a>()    // top buttons
        + 4                     // space around top buttons
        + rgb-&gt;<a href="qwidget.html#e3c588">height</a>();        // color-value text height
    <a name="setMinimumSize"></a><a href="qwidget.html#c0b5fb">setMinimumSize</a>( quitButton-&gt;<a name="pos"></a><a href="qwidget.html#2691c9">pos</a>().x(), yoffset+20 );
    <a name="resize"></a><a href="qwidget.html#8fcbbe">resize</a>( quitButton-&gt;<a href="qwidget.html#e515c8">geometry</a>().topRight().x() + 2, yoffset+60 );
#else
    yoffset = 0;
    <a href="qwidget.html#8fcbbe">resize</a>(350,350);
#endif

    grabx = graby = -1;
    grabbing = FALSE;

    <a name="setMouseTracking"></a><a href="qwidget.html#36406c">setMouseTracking</a>( TRUE );   // and do let me know what pixel I'm at, eh?

    <a name="grabAround"></a><a href="#298">grabAround</a>( <a href="qpoint.html">QPoint</a>(grabx=qApp-&gt;desktop()-&gt;width()/2, graby=qApp-&gt;desktop()-&gt;height()/2) );
}

void <a name="290"></a>MagWidget::setZoom( int index )
{
    if (index == 8)
        z = 16;
    else
        z = index+1;
    <a name="grab"></a><a href="#294">grab</a>();
}

void <a name="291"></a>MagWidget::setRefresh( int index )
{
    r = index;
    <a name="killTimers"></a><a href="qobject.html#0ef111">killTimers</a>();
    if (index &amp;&amp; !grabbing)
        <a name="startTimer"></a><a href="qobject.html#4c6b67">startTimer</a>( timer[r] );
}

void <a name="292"></a>MagWidget::save()
{
    if ( !p.<a name="isNull"></a><a href="qpixmap.html#7803c4">isNull</a>() ) {
        <a href="qobject.html#0ef111">killTimers</a>();
        <a href="qstring.html">QString</a> fn = QFileDialog::getSaveFileName();
        if ( !fn.<a name="isEmpty"></a><a href="qstring.html#c62623">isEmpty</a>() )
            p.<a name="save"></a><a href="qpixmap.html#a38b1c">save</a>( fn, "BMP" );
        if ( r )
            <a href="qobject.html#4c6b67">startTimer</a>( timer[r] );
    }
}

void <a name="293"></a>MagWidget::multiSave()
{
    if ( !p.<a href="qpixmap.html#7803c4">isNull</a>() ) {
        multifn = ""; // stops saving
        multifn = QFileDialog::getSaveFileName();
        if ( multifn.<a href="qstring.html#c62623">isEmpty</a>() )
            multiSaveButton-&gt;<a name="setOn"></a><a href="qpushbutton.html#15502f">setOn</a>(FALSE);
        if ( !r )
            p.<a href="qpixmap.html#a38b1c">save</a>( multifn, "BMP" );
    } else {
        multiSaveButton-&gt;<a href="qpushbutton.html#15502f">setOn</a>(FALSE);
    }
}

void <a name="294"></a>MagWidget::grab()
{
    if ( !isVisible() ) 
        return;                 // don't eat resources when iconified

    if ( grabx &lt; 0 || graby &lt; 0 )
        return;                 // don't grab until the user has said to

    int x,y, w,h;

    w = (<a href="qwidget.html#2edab1">width</a>()+z-1)/z;
    h = (<a href="qwidget.html#e3c588">height</a>()+z-1-yoffset)/z;
    if ( w&lt;1 || h&lt;1 )
        return;                 // don't ask too much from the window system :)

    x = grabx-w/2;              // find a suitable position to grab from
    y = graby-h/2;
    if ( x + w &gt; <a name="QApplication::desktop"></a><a href="qapplication.html#d8ed8c">QApplication::desktop</a>()-&gt;width() )
        x = QApplication::desktop()-&gt;width()-w;
    else if ( x &lt; 0 )
        x = 0;
    if ( y + h &gt; <a href="qapplication.html#d8ed8c">QApplication::desktop</a>()-&gt;height() ) 
        y = QApplication::desktop()-&gt;height()-h;
    else if ( y &lt; 0 )
        y = 0;

    p = QPixmap::grabWindow( <a href="qapplication.html#d8ed8c">QApplication::desktop</a>()-&gt;winId(),  x, y, w, h );
    image = p.<a name="convertToImage"></a><a href="qpixmap.html#8c5f15">convertToImage</a>();
    <a name="QWMatrix"></a><a href="qwmatrix.html">QWMatrix</a> m;                 // after getting it, scale it
    m.scale( (double)z, (double)z );
    pm = p.<a name="xForm"></a><a href="qpixmap.html#ff5fcf">xForm</a>( m );

    if ( !multiSaveButton || !multiSaveButton-&gt;<a name="isOn"></a><a href="qbutton.html#12ce08">isOn</a>() )
        <a name="repaint"></a><a href="qwidget.html#7569b1">repaint</a>( FALSE );               // and finally repaint, flicker-free
}

void <a name="295"></a>MagWidget::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * )
{
    if ( !pm.<a href="qpixmap.html#7803c4">isNull</a>() ) {
        <a name="QPainter"></a><a href="qpainter.html">QPainter</a> paint( this );
        paint.<a name="drawPixmap"></a><a href="qpainter.html#c64b89">drawPixmap</a>( 0, zoom ? zoom-&gt;<a href="qwidget.html#e3c588">height</a>()+4 : 0, pm, 
                              0,0, <a href="qwidget.html#2edab1">width</a>(), <a href="qwidget.html#e3c588">height</a>()-yoffset );
    }
}

void <a name="296"></a>MagWidget::mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> *e )
{
    if ( !grabbing ) {          // prepare to grab...
        grabbing = TRUE;
        <a href="qobject.html#0ef111">killTimers</a>();
        <a name="grabMouse"></a><a href="qwidget.html#5bdd5f">grabMouse</a>( crossCursor );
        grabx = -1;
        graby = -1;
    } else {                    // REALLY prepare to grab
        grabx = mapToGlobal(e-&gt;<a name="pos"></a><a href="qmouseevent.html#ac6f25">pos</a>()).x();
        graby = mapToGlobal(e-&gt;<a href="qmouseevent.html#ac6f25">pos</a>()).y();
    }
}

void <a name="297"></a>MagWidget::mouseReleaseEvent( <a href="qmouseevent.html">QMouseEvent</a> * e )
{
    if ( grabbing &amp;&amp; grabx &gt;= 0 &amp;&amp; graby &gt;= 0 ) {
        grabbing = FALSE;
        <a href=#298>grabAround</a>(e-&gt;<a href="qmouseevent.html#ac6f25">pos</a>());
        <a name="releaseMouse"></a><a href="qwidget.html#369707">releaseMouse</a>();
    }
}

void <a name="298"></a>MagWidget::grabAround(<a href="qpoint.html">QPoint</a> pos)
{
    int rx, ry;
    rx = mapToGlobal(pos).x();
    ry = mapToGlobal(pos).y();
    int w = QABS(rx-grabx);
    int h = QABS(ry-graby);
    if ( w &gt; 10 &amp;&amp; h &gt; 10 ) {
        int pz;
        pz = 1;
        while ( w*pz*h*pz &lt; width()*(<a href="qwidget.html#e3c588">height</a>()-yoffset) &amp;&amp;
                w*pz &lt; <a href="qapplication.html#d8ed8c">QApplication::desktop</a>()-&gt;width() &amp;&amp;
                h*pz &lt; <a href="qapplication.html#d8ed8c">QApplication::desktop</a>()-&gt;height() )
            pz++;
        if ( (w*pz*h*pz - width()*(<a href="qwidget.html#e3c588">height</a>()-yoffset)) &gt; 
             (<a href="qwidget.html#2edab1">width</a>()*(<a href="qwidget.html#e3c588">height</a>()-yoffset) - w*(pz-1)*h*(pz-1)) )
            pz--;
        if ( pz &lt; 1 )
            pz = 1;
        if ( pz &gt; 8 )
            pz = 8;
        if ( zoom )
            zoom-&gt;<a name="setCurrentItem"></a><a href="qcombobox.html#8a94f7">setCurrentItem</a>( pz-1 );

        z = pz;
        grabx = QMIN(rx, grabx) + w/2;
        graby = QMIN(ry, graby) + h/2;
        <a href="qwidget.html#8fcbbe">resize</a>( w*z, h*z+yoffset );
    }
    <a href=#294>grab</a>();
    if ( r )
        <a href="qobject.html#4c6b67">startTimer</a>( timer[r] );
}

void <a name="299"></a>MagWidget::mouseMoveEvent( <a href="qmouseevent.html">QMouseEvent</a> *e )
{
    if ( grabbing || pm.<a href="qpixmap.html#7803c4">isNull</a>() ||
         e-&gt;<a href="qmouseevent.html#ac6f25">pos</a>().y() &gt; height() - (zoom ? zoom-&gt;<a href="qwidget.html#386569">fontMetrics</a>().height() - 4 : 0) ||
         e-&gt;<a href="qmouseevent.html#ac6f25">pos</a>().y() &lt; (zoom ? zoom-&gt;<a href="qwidget.html#e3c588">height</a>()+4 : 4) ) {
        rgb-&gt;<a href="qlabel.html#bc5ea6">setText</a>( "" );
    } else {
        int x,y;
        x = e-&gt;<a href="qmouseevent.html#ac6f25">pos</a>().x() / z;
        y = (e-&gt;<a href="qmouseevent.html#ac6f25">pos</a>().y() - ( zoom ? zoom-&gt;<a href="qwidget.html#e3c588">height</a>() : 0 ) - 4) / z;
        <a href="qstring.html">QString</a> pixelinfo;
        if ( image.<a name="valid"></a><a href="qimage.html#81538b">valid</a>(x,y) )
        {
            QRgb px = image.<a name="pixel"></a><a href="qimage.html#ecfb25">pixel</a>(x,y);
            pixelinfo.<a name="sprintf"></a><a href="qstring.html#926f67">sprintf</a>(" %3d,%3d,%3d  #%02x%02x%02x",
                <a name="qRed"></a><a href="qcolor.html#2f7325">qRed</a>(px), <a name="qGreen"></a><a href="qcolor.html#1cf303">qGreen</a>(px), <a name="qBlue"></a><a href="qcolor.html#c84970">qBlue</a>(px),
                <a href="qcolor.html#2f7325">qRed</a>(px), <a href="qcolor.html#1cf303">qGreen</a>(px), <a href="qcolor.html#c84970">qBlue</a>(px));
        }
        <a href="qstring.html">QString</a> label;
        label.<a href="qstring.html#926f67">sprintf</a>( "x=%d, y=%d %s", 
            x+grabx, y+graby, (const char*)pixelinfo );
        rgb-&gt;<a href="qlabel.html#bc5ea6">setText</a>( label );
    }
}

void <a name="300"></a>MagWidget::focusOutEvent( <a href="qfocusevent.html">QFocusEvent</a> * )
{
    rgb-&gt;<a href="qlabel.html#bc5ea6">setText</a>( "" );
}

void <a name="301"></a>MagWidget::timerEvent( <a href="qtimerevent.html">QTimerEvent</a> * )
{
    <a href=#294>grab</a>();
/*
    if ( multiSaveButton-&gt;<a href="qbutton.html#12ce08">isOn</a>() &amp;&amp; !multifn.<a href="qstring.html#c62623">isEmpty</a>() ) {
        <a name="QRegExp"></a><a href="qregexp.html">QRegExp</a> num("[0-9][0-9]*");
        int start;
        int len;
        if ((start=num.<a name="match"></a><a href="qregexp.html#f6e804">match</a>(multifn,0,&amp;len))&gt;=0)
            multifn.<a name="replace"></a><a href="qstring.html#034e6e">replace</a>(num,
                <a href="qstring.html">QString</a>().setNum(multifn.<a name="mid"></a><a href="qstring.html#3b1493">mid</a>(start,len).toInt()+1)
            );
        p.<a href="qpixmap.html#a38b1c">save</a>( multifn, "BMP" );
    }
*/
}

void <a name="302"></a>MagWidget::resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * )
{
    rgb-&gt;<a href="qwidget.html#5e9ab1">setGeometry</a>( 0, <a href="qwidget.html#e3c588">height</a>() - rgb-&gt;<a href="qwidget.html#e3c588">height</a>(), <a href="qwidget.html#2edab1">width</a>(), rgb-&gt;<a href="qwidget.html#e3c588">height</a>() );
    <a href=#294>grab</a>();
}

#include "qmag.moc"

int main( int argc, char **argv )
{
    <a name="QApplication"></a><a href="qapplication.html">QApplication</a> a( argc, argv );
    MagWidget m;
    a.<a name="setMainWidget"></a><a href="qapplication.html#7ad759">setMainWidget</a>( &amp;m );
    m.<a name="show"></a><a href="qwidget.html#200ee5">show</a>();
    return a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();
}
</pre>
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<td>Copyright  2001 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
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