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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Show Image</h1>

   
<p> 
This example reads and displays an image in any supported image
format (GIF, BMP, PPM, XMP, etc.).
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/showimg.h   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 TQt.  This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/

#ifndef SHOWIMG_H
#define SHOWIMG_H

#include &lt;<a href="tqwidget-h.html">tqwidget.h</a>&gt;
#include &lt;<a href="tqimage-h.html">tqimage.h</a>&gt;


class TQLabel;
class TQMenuBar;
class TQPopupMenu;

class ImageViewer : public <a href="tqwidget.html">TQWidget</a>
{
    <a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
public:
    ImageViewer( <a href="tqwidget.html">TQWidget</a> *parent=0, const char *name=0, int wFlags=0 );
    ~ImageViewer();
    bool        loadImage( const <a href="tqstring.html">TQString</a>&amp; );
protected:
    void        paintEvent( <a href="tqpaintevent.html">TQPaintEvent</a> * );
    void        resizeEvent( <a href="qresizeevent.html">TQResizeEvent</a> * );
    void        mousePressEvent( <a href="qmouseevent.html">TQMouseEvent</a> * );
    void        mouseReleaseEvent( <a href="qmouseevent.html">TQMouseEvent</a> * );
    void        mouseMoveEvent( <a href="qmouseevent.html">TQMouseEvent</a> * );

private:
    void        scale();
    int         conversion_flags;
    bool        smooth() const;
    bool        useColorContext() const;
    int         alloc_context;
    bool        convertEvent( <a href="qmouseevent.html">TQMouseEvent</a>* e, int&amp; x, int&amp; y );
    <a href="tqstring.html">TQString</a>     filename;
    <a href="tqimage.html">TQImage</a>      image;                  // the loaded image
    <a href="tqpixmap.html">TQPixmap</a>     pm;                     // the converted pixmap
    <a href="tqpixmap.html">TQPixmap</a>     pmScaled;               // the scaled pixmap

    <a href="tqmenubar.html">TQMenuBar</a>   *menubar;
    <a href="tqpopupmenu.html">TQPopupMenu</a>  *file;
    <a href="tqpopupmenu.html">TQPopupMenu</a>   *saveimage;
    <a href="tqpopupmenu.html">TQPopupMenu</a>   *savepixmap;
    <a href="tqpopupmenu.html">TQPopupMenu</a>  *edit;
    <a href="tqpopupmenu.html">TQPopupMenu</a>  *options;

    <a href="tqwidget.html">TQWidget</a>    *helpmsg;
    <a href="tqlabel.html">TQLabel</a>     *status;
    int         si, sp, ac, co, mo, fd, bd, // Menu item ids
                td, ta, ba, fa, au, ad, dd,
                ss, cc, t1, t8, t32;
    void        updateStatus();
    void        setMenuItemFlags();
    bool        reconvertImage();
    int         pickx, picky;
    int         clickx, clicky;
    bool        may_be_other;
    static ImageViewer* other;
    void        setImage(const <a href="tqimage.html">TQImage</a>&amp; newimage);

private slots:
    void        to1Bit();
    void        to8Bit();
    void        to32Bit();
    void        toBitDepth(int);

    void        copy();
    void        paste();

    void        hFlip();
    void        vFlip();
    void        rot180();

    void        editText();

    void        newWindow();
    void        openFile();
    void        saveImage(int);
    void        savePixmap(int);
    void        giveHelp();
    void        doOption(int);
    void        copyFrom(ImageViewer*);
};


#endif // SHOWIMG_H
</pre>

<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/showimg.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 TQt.  This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/

#include "showimg.h"
#include "imagetexteditor.h"
#include &lt;<a href="tqmenubar-h.html">tqmenubar.h</a>&gt;
#include &lt;<a href="tqfiledialog-h.html">tqfiledialog.h</a>&gt;
#include &lt;<a href="qmessagebox-h.html">ntqmessagebox.h</a>&gt;
#include &lt;<a href="tqpopupmenu-h.html">tqpopupmenu.h</a>&gt;
#include &lt;<a href="tqlabel-h.html">tqlabel.h</a>&gt;
#include &lt;<a href="tqpainter-h.html">tqpainter.h</a>&gt;
#include &lt;<a href="qapplication-h.html">ntqapplication.h</a>&gt;
#include &lt;<a href="tqclipboard-h.html">tqclipboard.h</a>&gt;


/*
  In the constructor, we just pass the standard parameters on to
  TQWidget.

  The menu uses a single slot to simplify the process of adding
  more items to the options menu.
*/
<a name="f405"></a>ImageViewer::ImageViewer( <a href="tqwidget.html">TQWidget</a> *parent, const char *name, int wFlags )
    : <a href="tqwidget.html">TQWidget</a>( parent, name, wFlags ),
      conversion_flags( PreferDither ),
      helpmsg( 0 )
{
    pickx = -1;
    picky = -1;
    clickx = -1;
    clicky = -1;
    alloc_context = 0;

    menubar = new <a href="tqmenubar.html">TQMenuBar</a>(this);
<a name="x1326"></a>    menubar-&gt;<a href="tqmenubar.html#setSeparator">setSeparator</a>( TQMenuBar::InWindowsStyle );

<a name="x1323"></a>    <a href="tqstrlist.html">TQStrList</a> fmt = TQImage::<a href="tqimage.html#outputFormats">outputFormats</a>();
    saveimage = new <a href="tqpopupmenu.html">TQPopupMenu</a>( menubar );
    savepixmap = new <a href="tqpopupmenu.html">TQPopupMenu</a>( menubar );
<a name="x1344"></a><a name="x1343"></a>    for (const char* f = fmt.<a href="tqptrlist.html#first">first</a>(); f; f = fmt.<a href="tqptrlist.html#next">next</a>()) {
<a name="x1327"></a>        saveimage-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( f );
        savepixmap-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( f );
    }
<a name="x1341"></a>    <a href="tqobject.html#connect">connect</a>( saveimage, TQ_SIGNAL(<a href="tqpopupmenu.html#activated">activated</a>(int)), this, TQ_SLOT(saveImage(int)) );
    <a href="tqobject.html#connect">connect</a>( savepixmap, TQ_SIGNAL(<a href="tqpopupmenu.html#activated">activated</a>(int)), this, TQ_SLOT(savePixmap(int)) );

    file = new <a href="tqpopupmenu.html">TQPopupMenu</a>( menubar );
    menubar-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "&amp;File", file );
    file-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "&amp;New window", this,  TQ_SLOT(newWindow()), CTRL+Key_N );
    file-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "&amp;Open...", this,  TQ_SLOT(openFile()), CTRL+Key_O );
    si = file-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "Save image", saveimage );
    sp = file-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "Save pixmap", savepixmap );
<a name="x1328"></a>    file-&gt;<a href="tqmenudata.html#insertSeparator">insertSeparator</a>();
    file-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "E&amp;xit", tqApp,  TQ_SLOT(<a href="ntqapplication.html#quit">quit</a>()), CTRL+Key_Q );

    edit =  new <a href="tqpopupmenu.html">TQPopupMenu</a>( menubar );
    menubar-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "&amp;Edit", edit );
    edit-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>("&amp;Copy", this, TQ_SLOT(copy()), CTRL+Key_C);
    edit-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>("&amp;Paste", this, TQ_SLOT(paste()), CTRL+Key_V);
    edit-&gt;<a href="tqmenudata.html#insertSeparator">insertSeparator</a>();
    edit-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>("&amp;Horizontal flip", this, TQ_SLOT(hFlip()), ALT+Key_H);
    edit-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>("&amp;Vertical flip", this, TQ_SLOT(vFlip()), ALT+Key_V);
    edit-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>("&amp;Rotate 180", this, TQ_SLOT(rot180()), ALT+Key_R);
    edit-&gt;<a href="tqmenudata.html#insertSeparator">insertSeparator</a>();
    edit-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>("&amp;Text...", this, TQ_SLOT(editText()));
    edit-&gt;<a href="tqmenudata.html#insertSeparator">insertSeparator</a>();
    t1 = edit-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "Convert to &amp;1 bit", this, TQ_SLOT(to1Bit()) );
    t8 = edit-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "Convert to &amp;8 bit", this, TQ_SLOT(to8Bit()) );
    t32 = edit-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "Convert to &amp;32 bit", this, TQ_SLOT(to32Bit()) );

    options =  new <a href="tqpopupmenu.html">TQPopupMenu</a>( menubar );
    menubar-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "&amp;Options", options );
    ac = options-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "AutoColor" );
    co = options-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "ColorOnly" );
    mo = options-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "MonoOnly" );
    options-&gt;<a href="tqmenudata.html#insertSeparator">insertSeparator</a>();
    fd = options-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "DiffuseDither" );
    bd = options-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "OrderedDither" );
    td = options-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "ThresholdDither" );
    options-&gt;<a href="tqmenudata.html#insertSeparator">insertSeparator</a>();
    ta = options-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "ThresholdAlphaDither" );
    ba = options-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "OrderedAlphaDither" );
    fa = options-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "DiffuseAlphaDither" );
    options-&gt;<a href="tqmenudata.html#insertSeparator">insertSeparator</a>();
    ad = options-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "PreferDither" );
    dd = options-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "AvoidDither" );
    options-&gt;<a href="tqmenudata.html#insertSeparator">insertSeparator</a>();
    ss = options-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "Smooth scaling" );
    cc = options-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "Use color context" );
<a name="x1309"></a>    if ( TQApplication::<a href="ntqapplication.html#colorSpec">colorSpec</a>() == TQApplication::ManyColor )
<a name="x1331"></a>        options-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( cc, FALSE );
<a name="x1342"></a>    options-&gt;<a href="tqpopupmenu.html#setCheckable">setCheckable</a>( TRUE );
    setMenuItemFlags();

    menubar-&gt;<a href="tqmenudata.html#insertSeparator">insertSeparator</a>();

    <a href="tqpopupmenu.html">TQPopupMenu</a>* help = new <a href="tqpopupmenu.html">TQPopupMenu</a>( menubar );
    menubar-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "&amp;Help", help );
    help-&gt;<a href="tqmenudata.html#insertItem">insertItem</a>( "Help!", this, TQ_SLOT(giveHelp()), CTRL+Key_H );

    <a href="tqobject.html#connect">connect</a>( options, TQ_SIGNAL(<a href="tqpopupmenu.html#activated">activated</a>(int)), this, TQ_SLOT(doOption(int)) );

    status = new <a href="tqlabel.html">TQLabel</a>(this);
    status-&gt;<a href="tqframe.html#setFrameStyle">setFrameStyle</a>( TQFrame::WinPanel | TQFrame::Sunken );
<a name="x1354"></a>    status-&gt;<a href="tqwidget.html#setFixedHeight">setFixedHeight</a>( <a href="tqwidget.html#fontMetrics">fontMetrics</a>().height() + 4 );

    <a href="tqwidget.html#setMouseTracking">setMouseTracking</a>( TRUE );
}

ImageViewer::~ImageViewer()
{
    if ( alloc_context )
<a name="x1313"></a>        TQColor::<a href="tqcolor.html#destroyAllocContext">destroyAllocContext</a>( alloc_context );
    if ( other == this )
        other = 0;
}

/*
  This function modifies the conversion_flags when an options menu item
  is selected, then ensures all menu items are up to date, and reconverts
  the image if possibly necessary.
*/
void <a name="f406"></a>ImageViewer::doOption(int item)
{
    if ( item == ss || item == cc ) {
        // Toggle
<a name="x1329"></a>        bool newbool = !options-&gt;<a href="tqmenudata.html#isItemChecked">isItemChecked</a>(item);
<a name="x1330"></a>        options-&gt;<a href="tqmenudata.html#setItemChecked">setItemChecked</a>(item, newbool);
        // And reconvert...
        reconvertImage();
        <a href="tqwidget.html#repaint">repaint</a>(image.hasAlphaBuffer());        // show image in widget
        return;
    }

    if ( options-&gt;<a href="tqmenudata.html#isItemChecked">isItemChecked</a>( item ) ) return; // They are all radio buttons

    int ocf = conversion_flags;

    if ( item == ac ) {
        conversion_flags = ( conversion_flags &amp; ~ColorMode_Mask ) | AutoColor;
    } else if ( item == co ) {
        conversion_flags = ( conversion_flags &amp; ~ColorMode_Mask ) | ColorOnly;
    } else if ( item == mo ) {
        conversion_flags = ( conversion_flags &amp; ~ColorMode_Mask ) | MonoOnly;
    } else if ( item == fd ) {
        conversion_flags = ( conversion_flags &amp; ~Dither_Mask ) | DiffuseDither;
    } else if ( item == bd ) {
        conversion_flags = ( conversion_flags &amp; ~Dither_Mask ) | OrderedDither;
    } else if ( item == td ) {
        conversion_flags = ( conversion_flags &amp; ~Dither_Mask ) | ThresholdDither;
    } else if ( item == ta ) {
        conversion_flags = ( conversion_flags &amp; ~AlphaDither_Mask ) | ThresholdAlphaDither;
    } else if ( item == fa ) {
        conversion_flags = ( conversion_flags &amp; ~AlphaDither_Mask ) | DiffuseAlphaDither;
    } else if ( item == ba ) {
        conversion_flags = ( conversion_flags &amp; ~AlphaDither_Mask ) | OrderedAlphaDither;
    } else if ( item == ad ) {
        conversion_flags = ( conversion_flags &amp; ~DitherMode_Mask ) | PreferDither;
    } else if ( item == dd ) {
        conversion_flags = ( conversion_flags &amp; ~DitherMode_Mask ) | AvoidDither;
    }

    if ( ocf != conversion_flags ) {
        setMenuItemFlags();
        // And reconvert...
        reconvertImage();
        <a href="tqwidget.html#repaint">repaint</a>(image.hasAlphaBuffer());        // show image in widget
    }
}

/*
  Set the options menu to reflect the conversion_flags value.
*/
void <a name="f407"></a>ImageViewer::setMenuItemFlags()
{
    // File
    bool valid_image = pm.size() != TQSize( 0, 0 );
    file-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( si, valid_image );
    file-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( sp, valid_image );

    // Edit
    edit-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( t1, image.depth() != 1 );
    edit-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( t8, image.depth() != 8 );
    edit-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( t32, image.depth() != 32 );

    // Options
    bool may_need_color_dithering =
            !valid_image
        || image.depth() == 32 &amp;&amp; TQPixmap::<a href="tqpixmap.html#defaultDepth">defaultDepth</a>() &lt; 24;
    bool may_need_dithering = may_need_color_dithering
         || image.depth() &gt; 1 &amp;&amp; options-&gt;<a href="tqmenudata.html#isItemChecked">isItemChecked</a>(mo)
         || image.depth() &gt; 1 &amp;&amp; TQPixmap::<a href="tqpixmap.html#defaultDepth">defaultDepth</a>() == 1;
    bool has_alpha_mask = !valid_image || image.hasAlphaBuffer();

    options-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( fd, may_need_dithering );
    options-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( bd, may_need_dithering );
    options-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( td, may_need_dithering );

    options-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( ta, has_alpha_mask );
    options-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( fa, has_alpha_mask );
    options-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( ba, has_alpha_mask );

    options-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( ad, may_need_color_dithering );
    options-&gt;<a href="tqmenudata.html#setItemEnabled">setItemEnabled</a>( dd, may_need_color_dithering );

    options-&gt;<a href="tqmenudata.html#setItemChecked">setItemChecked</a>( ac, (conversion_flags &amp; ColorMode_Mask) == AutoColor );
    options-&gt;<a href="tqmenudata.html#setItemChecked">setItemChecked</a>( co, (conversion_flags &amp; ColorMode_Mask) == ColorOnly );
    options-&gt;<a href="tqmenudata.html#setItemChecked">setItemChecked</a>( mo, (conversion_flags &amp; ColorMode_Mask) == MonoOnly );
    options-&gt;<a href="tqmenudata.html#setItemChecked">setItemChecked</a>( fd, (conversion_flags &amp; Dither_Mask) == DiffuseDither );
    options-&gt;<a href="tqmenudata.html#setItemChecked">setItemChecked</a>( bd, (conversion_flags &amp; Dither_Mask) == OrderedDither );
    options-&gt;<a href="tqmenudata.html#setItemChecked">setItemChecked</a>( td, (conversion_flags &amp; Dither_Mask) == ThresholdDither );
    options-&gt;<a href="tqmenudata.html#setItemChecked">setItemChecked</a>( ta, (conversion_flags &amp; AlphaDither_Mask) == ThresholdAlphaDither );
    options-&gt;<a href="tqmenudata.html#setItemChecked">setItemChecked</a>( fa, (conversion_flags &amp; AlphaDither_Mask) == DiffuseAlphaDither );
    options-&gt;<a href="tqmenudata.html#setItemChecked">setItemChecked</a>( ba, (conversion_flags &amp; AlphaDither_Mask) == OrderedAlphaDither );
    options-&gt;<a href="tqmenudata.html#setItemChecked">setItemChecked</a>( ad, (conversion_flags &amp; DitherMode_Mask) == PreferDither );
    options-&gt;<a href="tqmenudata.html#setItemChecked">setItemChecked</a>( dd, (conversion_flags &amp; DitherMode_Mask) == AvoidDither );
}

void <a name="f408"></a>ImageViewer::updateStatus()
{
    if ( pm.size() == TQSize( 0, 0 ) ) {
        if ( !filename.isEmpty() )
            status-&gt;<a href="tqlabel.html#setText">setText</a>("Could not load image");
        else
            status-&gt;<a href="tqlabel.html#setText">setText</a>("No image - select Open from File menu.");
    } else {
        <a href="tqstring.html">TQString</a> message, moremsg;
        message.<a href="tqstring.html#sprintf">sprintf</a>("%dx%d", image.width(), image.height());
        if ( pm.size() != pmScaled.size() ) {
            moremsg.sprintf(" [%dx%d]", pmScaled.width(),
                pmScaled.height());
            message += moremsg;
        }
        moremsg.sprintf(", %d bits ", image.depth());
        message += moremsg;
        if (image.valid(pickx,picky)) {
            moremsg.sprintf("(%d,%d)=#%0*x ",
                          pickx, picky,
                          image.hasAlphaBuffer() ? 8 : 6,
                          image.pixel(pickx,picky));
            message += moremsg;
        }
        if ( image.numColors() &gt; 0 ) {
            if (image.valid(pickx,picky)) {
                moremsg.sprintf(", %d/%d colors", image.pixelIndex(pickx,picky),
                    image.numColors());
            } else {
                moremsg.sprintf(", %d colors", image.numColors());
            }
            message += moremsg;
        }
        if ( image.hasAlphaBuffer() ) {
            if ( image.depth() == 8 ) {
                int i;
                bool alpha[256];
                int nalpha=0;

                for (i=0; i&lt;256; i++)
                    alpha[i] = FALSE;

                for (i=0; i&lt;image.numColors(); i++) {
                    int alevel = image.color(i) &gt;&gt; 24;
                    if (!alpha[alevel]) {
                        alpha[alevel] = TRUE;
                        nalpha++;
                    }
                }
                moremsg.sprintf(", %d alpha levels", nalpha);
            } else {
                // Too many pixels to bother counting.
                moremsg = ", 8-bit alpha channel";
            }
            message += moremsg;
        }
        status-&gt;<a href="tqlabel.html#setText">setText</a>(message);
    }
}

/*
  This function saves the image.
*/
void <a name="f409"></a>ImageViewer::saveImage( int item )
{
<a name="x1332"></a>    const char* fmt = saveimage-&gt;<a href="tqmenudata.html#text">text</a>(item);
<a name="x1319"></a>    <a href="tqstring.html">TQString</a> savefilename = TQFileDialog::<a href="tqfiledialog.html#getSaveFileName">getSaveFileName</a>(TQString::null, <a href="tqstring.html#TQString-null">TQString::null</a>,
                                        this, filename);
    if ( !savefilename.<a href="tqstring.html#isEmpty">isEmpty</a>() )
        if ( !image.save( savefilename, fmt ) )
<a name="x1333"></a>            TQMessageBox::<a href="ntqmessagebox.html#warning">warning</a>( this, "Save failed", "Error saving file" );
}

/*
  This function saves the converted image.
*/
void <a name="f410"></a>ImageViewer::savePixmap( int item )
{
    const char* fmt = savepixmap-&gt;<a href="tqmenudata.html#text">text</a>(item);
    <a href="tqstring.html">TQString</a> savefilename = TQFileDialog::<a href="tqfiledialog.html#getSaveFileName">getSaveFileName</a>(TQString::null,
                                        TQString::null, this, filename);
    if ( !savefilename.<a href="tqstring.html#isEmpty">isEmpty</a>() )
        if ( !pmScaled.save( savefilename, fmt ) )
            TQMessageBox::<a href="ntqmessagebox.html#warning">warning</a>( this, "Save failed", "Error saving file" );
}


void <a name="f411"></a>ImageViewer::newWindow()
{
    ImageViewer* that = new ImageViewer(0, "new window", WDestructiveClose);
    that-&gt;options-&gt;<a href="tqmenudata.html#setItemChecked">setItemChecked</a>( that-&gt;cc, useColorContext() );
    that-&gt;<a href="tqwidget.html#show">show</a>();
}

/*
  This function is the slot for processing the Open menu item.
*/
void <a name="f412"></a>ImageViewer::openFile()
{
<a name="x1318"></a>    <a href="tqstring.html">TQString</a> newfilename = TQFileDialog::<a href="tqfiledialog.html#getOpenFileName">getOpenFileName</a>( TQString::null,
                                                        TQString::null,
                                                        this );
    if ( !newfilename.<a href="tqstring.html#isEmpty">isEmpty</a>() ) {
        loadImage( newfilename ) ;
        <a href="tqwidget.html#repaint">repaint</a>();                      // show image in widget
    }
}

/*
  This function loads an image from a file and resizes the widget to
  exactly fit the image size. If the file was not found or the image
  format was unknown it will resize the widget to fit the errorText
  message (see above) displayed in the current font.

  Returns TRUE if the image was successfully loaded.
*/

bool <a name="f413"></a>ImageViewer::loadImage( const <a href="tqstring.html">TQString</a>&amp; fileName )
{
    filename = fileName;
    bool ok = FALSE;
    if ( !filename.isEmpty() ) {
<a name="x1312"></a>        TQApplication::<a href="ntqapplication.html#setOverrideCursor">setOverrideCursor</a>( waitCursor ); // this might take time
        ok = image.load(filename, 0);
        pickx = -1;
        clickx = -1;
        if ( ok )
            ok = reconvertImage();
        if ( ok ) {
            <a href="tqwidget.html#setCaption">setCaption</a>( filename );                     // set window caption
            int w = pm.width();
            int h = pm.height();

            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;
            }

<a name="x1347"></a><a name="x1325"></a>            h += menubar-&gt;<a href="tqmenubar.html#heightForWidth">heightForWidth</a>(w) + status-&gt;<a href="tqwidget.html#height">height</a>();
            <a href="tqwidget.html#resize">resize</a>( w, h );                             // we resize to fit image
        } else {
            pm.resize(0,0);                             // couldn't load image
            <a href="tqwidget.html#update">update</a>();
        }
<a name="x1311"></a>        TQApplication::<a href="ntqapplication.html#restoreOverrideCursor">restoreOverrideCursor</a>();  // restore original cursor
    }
    updateStatus();
    setMenuItemFlags();
    return ok;
}

bool <a name="f414"></a>ImageViewer::reconvertImage()
{
    bool success = FALSE;

    if ( image.isNull() ) return FALSE;

    if ( alloc_context ) {
        TQColor::<a href="tqcolor.html#destroyAllocContext">destroyAllocContext</a>( alloc_context );
        alloc_context = 0;
    }
    if ( useColorContext() ) {
<a name="x1314"></a>        alloc_context = TQColor::<a href="tqcolor.html#enterAllocContext">enterAllocContext</a>();
        // Clear the image to hide flickering palette
        <a href="tqpainter.html">TQPainter</a> painter(this);
<a name="x1338"></a>        painter.<a href="tqpainter.html#eraseRect">eraseRect</a>(0, menubar-&gt;<a href="tqmenubar.html#heightForWidth">heightForWidth</a>( <a href="tqwidget.html#width">width</a>() ), width(), height());
    }

    TQApplication::<a href="ntqapplication.html#setOverrideCursor">setOverrideCursor</a>( waitCursor ); // this might take time
    if ( pm.convertFromImage(image, conversion_flags) )
    {
        pmScaled = TQPixmap();
        scale();
        <a href="tqwidget.html#resize">resize</a>( <a href="tqwidget.html#width">width</a>(), height() );
        success = TRUE;                         // load successful
    } else {
        pm.resize(0,0);                         // couldn't load image
    }
    updateStatus();
    setMenuItemFlags();
    TQApplication::<a href="ntqapplication.html#restoreOverrideCursor">restoreOverrideCursor</a>();      // restore original cursor

    if ( useColorContext() )
<a name="x1315"></a>        TQColor::<a href="tqcolor.html#leaveAllocContext">leaveAllocContext</a>();

    return success;                             // TRUE if loaded OK
}

bool <a name="f415"></a>ImageViewer::smooth() const
{
    return options-&gt;<a href="tqmenudata.html#isItemChecked">isItemChecked</a>(ss);
}

bool <a name="f416"></a>ImageViewer::useColorContext() const
{
    return options-&gt;<a href="tqmenudata.html#isItemChecked">isItemChecked</a>(cc);
}

/*
  This functions scales the pixmap in the member variable "pm" to fit the
  widget size and  puts the resulting pixmap in the member variable "pmScaled".
*/

void <a name="f417"></a>ImageViewer::scale()
{
    int h = <a href="tqwidget.html#height">height</a>() - menubar-&gt;<a href="tqmenubar.html#heightForWidth">heightForWidth</a>( <a href="tqwidget.html#width">width</a>() ) - status-&gt;<a href="tqwidget.html#height">height</a>();

    if ( image.isNull() ) return;

    TQApplication::<a href="ntqapplication.html#setOverrideCursor">setOverrideCursor</a>( waitCursor ); // this might take time
    if ( <a href="tqwidget.html#width">width</a>() == pm.width() &amp;&amp; h == pm.height() )
    {                                           // no need to scale if widget
        pmScaled = pm;                          // size equals pixmap size
    } else {
        if (smooth()) {
            pmScaled.convertFromImage(image.smoothScale(<a href="tqwidget.html#width">width</a>(), h),
                conversion_flags);
        } else {
            <a href="tqwmatrix.html">TQWMatrix</a> m;                         // <a href="tqwmatrix.html#TransformationMode">transformation matrix</a>
<a name="x1357"></a>            m.<a href="tqwmatrix.html#scale">scale</a>(((double)<a href="tqwidget.html#width">width</a>())/pm.width(),// define scale factors
                    ((double)h)/pm.height());
            pmScaled = pm.xForm( m );           // create scaled pixmap
        }
    }
    TQApplication::<a href="ntqapplication.html#restoreOverrideCursor">restoreOverrideCursor</a>();      // restore original cursor
}

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

<a name="x1353"></a>void ImageViewer::<a href="tqwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">TQResizeEvent</a> * )
{
<a name="x1355"></a>    status-&gt;<a href="tqwidget.html#setGeometry">setGeometry</a>(0, height() - status-&gt;<a href="tqwidget.html#height">height</a>(),
                        <a href="tqwidget.html#width">width</a>(), status-&gt;<a href="tqwidget.html#height">height</a>());

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

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

bool <a name="f418"></a>ImageViewer::convertEvent( <a href="qmouseevent.html">TQMouseEvent</a>* e, int&amp; x, int&amp; y)
{
    if ( pm.size() != TQSize( 0, 0 ) ) {
        int h = <a href="tqwidget.html#height">height</a>() - menubar-&gt;<a href="tqmenubar.html#heightForWidth">heightForWidth</a>( <a href="tqwidget.html#width">width</a>() ) - status-&gt;<a href="tqwidget.html#height">height</a>();
<a name="x1335"></a>        int nx = e-&gt;<a href="qmouseevent.html#x">x</a>() * image.width() / width();
<a name="x1336"></a>        int ny = (e-&gt;<a href="qmouseevent.html#y">y</a>()-menubar-&gt;<a href="tqmenubar.html#heightForWidth">heightForWidth</a>( <a href="tqwidget.html#width">width</a>() )) * image.height() / h;
        if (nx != x || ny != y ) {
            x = nx;
            y = ny;
            updateStatus();
            return TRUE;
        }
    }
    return FALSE;
}

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

<a name="x1350"></a>void ImageViewer::<a href="tqwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> * )
{
    if ( may_be_other )
        other = this;
}

/*
  Record the pixel position of interest.
*/
void ImageViewer::<a href="tqwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> *e )
{
    if (convertEvent(e,pickx,picky)) {
        updateStatus();
<a name="x1334"></a>        if ((e-&gt;<a href="qmouseevent.html#state">state</a>()&amp;LeftButton)) {
            may_be_other = FALSE;
            if ( clickx &gt;= 0 &amp;&amp; other) {
                copyFrom(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 ImageViewer::<a href="tqwidget.html#paintEvent">paintEvent</a>( <a href="tqpaintevent.html">TQPaintEvent</a> *e )
{
    if ( pm.size() != TQSize( 0, 0 ) ) {         // is an image loaded?
        <a href="tqpainter.html">TQPainter</a> painter(this);
<a name="x1340"></a><a name="x1339"></a>        painter.<a href="tqpainter.html#setClipRect">setClipRect</a>(e-&gt;<a href="tqpaintevent.html#rect">rect</a>());
<a name="x1337"></a>        painter.<a href="tqpainter.html#drawPixmap">drawPixmap</a>(0, menubar-&gt;<a href="tqmenubar.html#heightForWidth">heightForWidth</a>( <a href="tqwidget.html#width">width</a>() ), pmScaled);
    }
}


/*
  Explain anything that might be confusing.
*/
void <a name="f419"></a>ImageViewer::giveHelp()
{
    if (!helpmsg) {
        <a href="tqstring.html">TQString</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;";
<a name="x1321"></a>        helptext += TQImage::<a href="tqimage.html#inputFormatList">inputFormatList</a>().join(", ");
        helptext += "&lt;/blockquote&gt;";

        helpmsg = new <a href="ntqmessagebox.html">TQMessageBox</a>( "Help", helptext,
            TQMessageBox::Information, TQMessageBox::Ok, 0, 0, 0, 0, FALSE );
    }
<a name="x1317"></a>    helpmsg-&gt;<a href="tqdialog.html#show">show</a>();
<a name="x1352"></a>    helpmsg-&gt;<a href="tqwidget.html#raise">raise</a>();
}

void <a name="f420"></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 = TQABS(clickx - pickx)+1;
        int sh = TQABS(clicky - picky)+1;
        if ( clickx &gt; pickx ) {
            dx = pickx;
            sx -= sw-1;
        }
        if ( clicky &gt; picky ) {
            dy = picky;
            sy -= sh-1;
        }
        <a href="tqimage.html#bitBlt">bitBlt</a>( &amp;image, dx, dy, &amp;s-&gt;image, sx, sy, sw, sh );
        reconvertImage();
        <a href="tqwidget.html#repaint">repaint</a>( image.hasAlphaBuffer() );
    }
}
ImageViewer* ImageViewer::other = 0;

void <a name="f421"></a>ImageViewer::hFlip()
{
    setImage(image.mirror(TRUE,FALSE));
}

void <a name="f422"></a>ImageViewer::vFlip()
{
    setImage(image.mirror(FALSE,TRUE));
}

void <a name="f423"></a>ImageViewer::rot180()
{
    setImage(image.mirror(TRUE,TRUE));
}

void <a name="f424"></a>ImageViewer::copy()
{
#ifndef TQT_NO_MIMECLIPBOARD
<a name="x1308"></a>    TQApplication::<a href="ntqapplication.html#clipboard">clipboard</a>()-&gt;setImage(image); // Less information loss
#endif
}

void <a name="f425"></a>ImageViewer::paste()
{
#ifndef TQT_NO_MIMECLIPBOARD
    <a href="tqimage.html">TQImage</a> p = TQApplication::<a href="ntqapplication.html#clipboard">clipboard</a>()-&gt;image();
<a name="x1322"></a>    if ( !p.<a href="tqimage.html#isNull">isNull</a>() ) {
        filename = "pasted";
        setImage(p);
    }
#endif
}

void <a name="f426"></a>ImageViewer::setImage(const <a href="tqimage.html">TQImage</a>&amp; newimage)
{
    image = newimage;

    pickx = -1;
    clickx = -1;
    <a href="tqwidget.html#setCaption">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;<a href="tqmenubar.html#heightForWidth">heightForWidth</a>(w) + status-&gt;<a href="tqwidget.html#height">height</a>();
    <a href="tqwidget.html#resize">resize</a>( w, h );                             // we resize to fit image

    reconvertImage();
    <a href="tqwidget.html#repaint">repaint</a>( image.hasAlphaBuffer() );

    updateStatus();
    setMenuItemFlags();
}

void <a name="f427"></a>ImageViewer::editText()
{
    ImageTextEditor editor(image,this);
    editor.<a href="tqdialog.html#exec">exec</a>();
}

void <a name="f428"></a>ImageViewer::to1Bit()
{
    toBitDepth(1);
}

void <a name="f429"></a>ImageViewer::to8Bit()
{
    toBitDepth(8);
}

void <a name="f430"></a>ImageViewer::to32Bit()
{
    toBitDepth(32);
}

void <a name="f431"></a>ImageViewer::toBitDepth(int d)
{
    image = image.convertDepth(d);
    reconvertImage();
    <a href="tqwidget.html#repaint">repaint</a>( image.hasAlphaBuffer() );
}
</pre>

<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id: qt/main.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 TQt.  This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/

#include "showimg.h"
#include "imagefip.h"
#include &lt;<a href="qapplication-h.html">ntqapplication.h</a>&gt;
#include &lt;<a href="tqimage-h.html">tqimage.h</a>&gt;

int main( int argc, char **argv )
{
    if ( argc &gt; 1 &amp;&amp; TQString(argv[1]) == "-m" ) {
<a name="x1361"></a>        TQApplication::<a href="ntqapplication.html#setColorSpec">setColorSpec</a>( TQApplication::ManyColor );
        argc--;
        argv++;
    }
    else if ( argc &gt; 1 &amp;&amp; TQString(argv[1]) == "-n" ) {
        TQApplication::<a href="ntqapplication.html#setColorSpec">setColorSpec</a>( TQApplication::NormalColor );
        argc--;
        argv++;
    }
    else {
        TQApplication::<a href="ntqapplication.html#setColorSpec">setColorSpec</a>( TQApplication::CustomColor );
    }

    <a href="ntqapplication.html">TQApplication</a> a( argc, argv );

    ImageIconProvider iip;
<a name="x1362"></a>    TQFileDialog::<a href="tqfiledialog.html#setIconProvider">setIconProvider</a>( &amp;iip );

    if ( argc &lt;= 1 ) {
        // Create a window which looks after its own existence.
        ImageViewer *w =
            new ImageViewer(0, "new window", TQt::WDestructiveClose | TQt::WResizeNoErase );
<a name="x1364"></a>        w-&gt;<a href="tqwidget.html#setCaption">setCaption</a>("TQt Example - Image Viewer");
        w-&gt;<a href="tqwidget.html#show">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], TQt::WDestructiveClose | TQt::WResizeNoErase );
            w-&gt;<a href="tqwidget.html#setCaption">setCaption</a>("TQt Example - Image Viewer");
            w-&gt;loadImage( argv[i] );
            w-&gt;<a href="tqwidget.html#show">show</a>();
        }
    }

    TQObject::<a href="tqobject.html#connect">connect</a>(tqApp, TQ_SIGNAL(<a href="ntqapplication.html#lastWindowClosed">lastWindowClosed</a>()), tqApp, TQ_SLOT(<a href="ntqapplication.html#quit">quit</a>()));

    return a.<a href="ntqapplication.html#exec">exec</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>TQt 3.3.8</div>
</table></div></address></body>
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