showimg-main-cpp.html

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        } else {
            <a href="qwmatrix.html">QWMatrix</a> m;                         // transformation matrix
            m.<a href="qwmatrix.html#41a356">scale</a>(((double)width())/pm.width(),// define scale factors
                    ((double)h)/pm.height());
            pmScaled = pm.xForm( m );           // create scaled pixmap
        }
    }
    <a href="qapplication.html#655095">QApplication::restoreOverrideCursor</a>();      // restore original cursor
}

/*
  The resize event handler, if a valid pixmap was loaded it will call
  <a href=#381>scale</a>() to fit the pixmap to the new widget size.
*/

void <a name="382"></a>ImageViewer::resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * )
{
    status-&gt;setGeometry(0, <a href="qwidget.html#e3c588">height</a>() - status-&gt;height(),
                        <a href="qwidget.html#2edab1">width</a>(), status-&gt;height());

    if ( pm.size() == QSize( 0, 0 ) )           // we couldn't load the image
        return;

    int h = height() - menubar-&gt;heightForWidth( <a href="qwidget.html#2edab1">width</a>() ) - status-&gt;height();
    if ( width() != pmScaled.width() || h != pmScaled.height())
    {                                           // if new size,
        <a href=#381>scale</a>();                                // scale pmScaled to window
        <a href=#371>updateStatus</a>();
    }
    if ( image.hasAlphaBuffer() )
        <a href="qwidget.html#10cf79">erase</a>();
}

bool <a name="383"></a>ImageViewer::convertEvent( <a href="qmouseevent.html">QMouseEvent</a>* e, int&amp; x, int&amp; y)
{
    if ( pm.size() != QSize( 0, 0 ) ) {
        int h = height() - menubar-&gt;heightForWidth( <a href="qwidget.html#2edab1">width</a>() ) - status-&gt;height();
        int nx = e-&gt;x() * image.width() / width();
        int ny = (e-&gt;y()-menubar-&gt;heightForWidth( <a href="qwidget.html#2edab1">width</a>() )) * image.height() / h;
        if (nx != x || ny != y ) {
            x = nx;
            y = ny;
            <a href=#371>updateStatus</a>();
            return TRUE;
        }
    }
    return FALSE;
}

void <a name="384"></a>ImageViewer::mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> *e )
{
    may_be_other = convertEvent(e, clickx, clicky);
}

void <a name="385"></a>ImageViewer::mouseReleaseEvent( <a href="qmouseevent.html">QMouseEvent</a> * )
{
    if ( may_be_other )
        other = this;
}

/*
  Record the pixel position of interest.
*/
void <a name="386"></a>ImageViewer::mouseMoveEvent( <a href="qmouseevent.html">QMouseEvent</a> *e )
{
    if (convertEvent(e,pickx,picky)) {
        <a href=#371>updateStatus</a>();
        if ((e-&gt;state()&amp;LeftButton)) {
            may_be_other = FALSE;
            if ( clickx &gt;= 0 &amp;&amp; other) {
                <a href=#389>copyFrom</a>(other);
            }
        }
    }
}

/*
  Draws the portion of the scaled pixmap that needs to be updated or prints
  an error message if no legal pixmap has been loaded.
*/

void <a name="387"></a>ImageViewer::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> *e )
{
    if ( pm.size() != QSize( 0, 0 ) ) {         // is an image loaded?
        <a href="qpainter.html">QPainter</a> painter(this);
        painter.<a href="qpainter.html#898839">setClipRect</a>(e-&gt;<a href="qpaintevent.html#2d6e18">rect</a>());
        painter.<a href="qpainter.html#c64b89">drawPixmap</a>(0, menubar-&gt;heightForWidth( <a href="qwidget.html#2edab1">width</a>() ), pmScaled);
    }
}

/*
  Explain anything that might be confusing.
*/
void <a name="388"></a>ImageViewer::giveHelp()
{
    if (!helpmsg) {
        <a href="qstring.html">QString</a> helptext =
            "&lt;b&gt;Usage:&lt;/b&gt; &lt;tt&gt;showimg [-m] &lt;i&gt;filename ...&lt;/i&gt;&lt;/tt&gt;"
            "&lt;blockquote&gt;"
                "&lt;tt&gt;-m&lt;/tt&gt; - use &lt;i&gt;ManyColor&lt;/i&gt; color spec"
            "&lt;/blockquote&gt;"
            "&lt;p&gt;Supported input formats:"
            "&lt;blockquote&gt;";
        helptext += QImage::inputFormatList().join(", ");
        helptext += "&lt;/blockquote&gt;";

        helpmsg = new <a href="qmessagebox.html">QMessageBox</a>( "Help", helptext,
            QMessageBox::Information, QMessageBox::Ok, 0, 0, 0, 0, FALSE );
    }
    helpmsg-&gt;show();
    helpmsg-&gt;raise();
}

void <a name="389"></a>ImageViewer::copyFrom(ImageViewer* s)
{
    if ( clickx &gt;= 0 ) {
        int dx = clickx;
        int dy = clicky;
        int sx = s-&gt;clickx;
        int sy = s-&gt;clicky;
        int sw = QABS(clickx - pickx)+1;
        int sh = QABS(clicky - picky)+1;
        if ( clickx &gt; pickx ) {
            dx = pickx;
            sx -= sw-1;
        }
        if ( clicky &gt; picky ) {
            dy = picky;
            sy -= sh-1;
        }
        <a href="qpaintdevice.html#35ae2e">bitBlt</a>( &amp;image, dx, dy, &amp;s-&gt;image, sx, sy, sw, sh );
        <a href=#377>reconvertImage</a>();
        <a href="qwidget.html#7569b1">repaint</a>( image.hasAlphaBuffer() );
    }
}
ImageViewer* <a name="390"></a>ImageViewer::other = 0;

void <a name="391"></a>ImageViewer::hFlip()
{
    <a href=#396>setImage</a>(image.mirror(TRUE,FALSE));
}

void <a name="392"></a>ImageViewer::vFlip()
{
    <a href=#396>setImage</a>(image.mirror(FALSE,TRUE));
}

void <a name="393"></a>ImageViewer::rot180()
{
    <a href=#396>setImage</a>(image.mirror(TRUE,TRUE));
}

void <a name="394"></a>ImageViewer::copy()
{
#ifndef QT_NO_MIMECLIPBOARD
    <a href="qapplication.html#1c95b5">QApplication::clipboard</a>()-&gt;setImage(image); // Less information loss
#endif
}

void <a name="395"></a>ImageViewer::paste()
{
#ifndef QT_NO_MIMECLIPBOARD
    <a href="qimage.html">QImage</a> p = QApplication::clipboard()-&gt;image();

    if ( !image.isNull() ) {
        filename = "pasted";
        <a href=#396>setImage</a>(p);
    }
#endif
}

void <a name="396"></a>ImageViewer::setImage(const QImage&amp; newimage)
{
    image = newimage;

    pickx = -1;
    clickx = -1;
    <a href="qwidget.html#d6a291">setCaption</a>( filename );                     // set window caption
    int w = image.width();
    int h = image.height();

    if ( !w )
        return;

    const int reasonable_width = 128;
    if ( w &lt; reasonable_width ) {
        // Integer scale up to something reasonable
        int multiply = ( reasonable_width + w - 1 ) / w;
        w *= multiply;
        h *= multiply;
    }

    h += menubar-&gt;heightForWidth(w) + status-&gt;height();
    <a href="qwidget.html#8fcbbe">resize</a>( w, h );                             // we resize to fit image

    <a href=#377>reconvertImage</a>();
    <a href="qwidget.html#7569b1">repaint</a>( image.hasAlphaBuffer() );

    <a href=#371>updateStatus</a>();
    <a href=#370>setMenuItemFlags</a>();
}

void <a name="397"></a>ImageViewer::editText()
{
    ImageTextEditor editor(image,this);
    editor.exec();
}

void <a name="398"></a>ImageViewer::to1Bit()
{
    <a href=#401>toBitDepth</a>(1);
}

void <a name="399"></a>ImageViewer::to8Bit()
{
    <a href=#401>toBitDepth</a>(8);
}

void <a name="400"></a>ImageViewer::to32Bit()
{
    <a href=#401>toBitDepth</a>(32);
}

void <a name="401"></a>ImageViewer::toBitDepth(int d)
{
    image = image.convertDepth(d);
    <a href=#377>reconvertImage</a>();
    <a href="qwidget.html#7569b1">repaint</a>( image.hasAlphaBuffer() );
}
</pre>


  <hr>

  Main:
<pre>/****************************************************************************
** &#36;Id&#58; qt/examples/showimg/main.cpp   2.3.8   edited 2004-05-12 $
**
** 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 "showimg.h"
#include "imagefip.h"
#include &lt;<a name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a name="qimage.h"></a><a href="qimage-h.html">qimage.h</a>&gt;

int main( int argc, char **argv )
{
    if ( argc &gt; 1 &amp;&amp; <a name="QString"></a><a href="qstring.html">QString</a>(argv[1]) == "-m" ) {
        <a name="QApplication::setColorSpec"></a><a href="qapplication.html#1ee2d1">QApplication::setColorSpec</a>( QApplication::ManyColor );
        argc--;
        argv++;
    } 
    else if ( argc &gt; 1 &amp;&amp; <a href="qstring.html">QString</a>(argv[1]) == "-n" ) {
        <a href="qapplication.html#1ee2d1">QApplication::setColorSpec</a>( QApplication::NormalColor );
        argc--;
        argv++;
    } 
    else {
        <a href="qapplication.html#1ee2d1">QApplication::setColorSpec</a>( QApplication::CustomColor );
    }

    <a name="QApplication::setFont"></a><a href="qapplication.html#3d926a">QApplication::setFont</a>( <a name="QFont"></a><a href="qfont.html">QFont</a>("Helvetica", 12) );
    <a name="QApplication"></a><a href="qapplication.html">QApplication</a> a( argc, argv );

    <a name="QFileDialog::setIconProvider"></a><a href="qfiledialog.html#8d2ecf">QFileDialog::setIconProvider</a>(new ImageIconProvider);

    if ( argc &lt;= 1 ) {
        // Create a window which looks after its own existence.
        ImageViewer *w =
            new ImageViewer(0, "new window", Qt::WDestructiveClose | Qt::WResizeNoErase );
        w-&gt;<a name="setCaption"></a><a href="qwidget.html#d6a291">setCaption</a>("Qt Example - Image Viewer");
        w-&gt;<a name="show"></a><a href="qwidget.html#200ee5">show</a>();
    } else {
        for ( int i=1; i&lt;argc; i++ ) {
            // Create a window which looks after its own existence.
            ImageViewer *w =
                new ImageViewer(0, argv[i], Qt::WDestructiveClose | Qt::WResizeNoErase );
            w-&gt;<a href="qwidget.html#d6a291">setCaption</a>("Qt Example - Image Viewer");
            w-&gt;loadImage( argv[i] );
            w-&gt;<a href="qwidget.html#200ee5">show</a>();
        }
    }

    <a name="QObject::connect"></a><a href="qobject.html#7f8e37">QObject::connect</a>(qApp, SIGNAL(lastWindowClosed()), qApp, SLOT(quit()));

    return a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();
}
</pre>
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