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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 3.0.2 edited Oct 12 12:18 $
**
** 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.
**
*****************************************************************************/
#ifndef SHOWIMG_H
#define SHOWIMG_H
#include <<a href="qwidget-h.html">qwidget.h</a>>
#include <<a href="qimage-h.html">qimage.h</a>>
class QLabel;
class QMenuBar;
class QPopupMenu;
class ImageViewer : public <a href="qwidget.html">QWidget</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
ImageViewer( <a href="qwidget.html">QWidget</a> *parent=0, const char *name=0, int wFlags=0 );
~ImageViewer();
bool loadImage( const char *fileName );
protected:
void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * );
void resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * );
void mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
void mouseReleaseEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
void mouseMoveEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
private:
void scale();
int conversion_flags;
bool smooth() const;
bool useColorContext() const;
int alloc_context;
bool convertEvent( <a href="qmouseevent.html">QMouseEvent</a>* e, int& x, int& y );
const char* filename;
<a href="qimage.html">QImage</a> image; // the loaded image
<a href="qpixmap.html">QPixmap</a> pm; // the converted pixmap
<a href="qpixmap.html">QPixmap</a> pmScaled; // the scaled pixmap
<a href="qmenubar.html">QMenuBar</a> *menubar;
<a href="qpopupmenu.html">QPopupMenu</a> *file;
<a href="qpopupmenu.html">QPopupMenu</a> *saveimage;
<a href="qpopupmenu.html">QPopupMenu</a> *savepixmap;
<a href="qpopupmenu.html">QPopupMenu</a> *edit;
<a href="qpopupmenu.html">QPopupMenu</a> *options;
<a href="qwidget.html">QWidget</a> *helpmsg;
<a href="qlabel.html">QLabel</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="qimage.html">QImage</a>& 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 3.0.2 edited Oct 12 12:18 $
**
** 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 "imagetexteditor.h"
#include <<a href="qmenubar-h.html">qmenubar.h</a>>
#include <<a href="qfiledialog-h.html">qfiledialog.h</a>>
#include <<a href="qmessagebox-h.html">qmessagebox.h</a>>
#include <<a href="qpopupmenu-h.html">qpopupmenu.h</a>>
#include <<a href="qlabel-h.html">qlabel.h</a>>
#include <<a href="qpainter-h.html">qpainter.h</a>>
#include <<a href="qapplication-h.html">qapplication.h</a>>
#include <<a href="qclipboard-h.html">qclipboard.h</a>>
/*
In the constructor, we just pass the standard parameters on to
QWidget.
The menu uses a single slot to simplify the process of adding
more items to the options menu.
*/
<a name="f206"></a>ImageViewer::ImageViewer( <a href="qwidget.html">QWidget</a> *parent, const char *name, int wFlags )
: <a href="qwidget.html">QWidget</a>( parent, name, wFlags ),
conversion_flags( PreferDither ),
filename( 0 ),
helpmsg( 0 )
{
pickx = -1;
picky = -1;
clickx = -1;
clicky = -1;
alloc_context = 0;
menubar = new <a href="qmenubar.html">QMenuBar</a>(this);
<a name="x426"></a> menubar-><a href="qmenubar.html#setSeparator">setSeparator</a>( QMenuBar::InWindowsStyle );
<a name="x423"></a> <a href="qstrlist.html">QStrList</a> fmt = QImage::<a href="qimage.html#outputFormats">outputFormats</a>();
saveimage = new <a href="qpopupmenu.html">QPopupMenu</a>( menubar );
savepixmap = new <a href="qpopupmenu.html">QPopupMenu</a>( menubar );
<a name="x444"></a><a name="x443"></a> for (const char* f = fmt.<a href="qptrlist.html#first">first</a>(); f; f = fmt.<a href="qptrlist.html#next">next</a>()) {
<a name="x427"></a> saveimage-><a href="qmenudata.html#insertItem">insertItem</a>( f );
savepixmap-><a href="qmenudata.html#insertItem">insertItem</a>( f );
}
<a name="x441"></a> <a href="qobject.html#connect">connect</a>( saveimage, SIGNAL(<a href="qpopupmenu.html#activated">activated</a>(int)), this, SLOT(saveImage(int)) );
<a href="qobject.html#connect">connect</a>( savepixmap, SIGNAL(<a href="qpopupmenu.html#activated">activated</a>(int)), this, SLOT(savePixmap(int)) );
file = new <a href="qpopupmenu.html">QPopupMenu</a>( menubar );
menubar-><a href="qmenudata.html#insertItem">insertItem</a>( "&File", file );
file-><a href="qmenudata.html#insertItem">insertItem</a>( "&New window", this, SLOT(newWindow()), CTRL+Key_N );
file-><a href="qmenudata.html#insertItem">insertItem</a>( "&Open...", this, SLOT(openFile()), CTRL+Key_O );
si = file-><a href="qmenudata.html#insertItem">insertItem</a>( "Save image", saveimage );
sp = file-><a href="qmenudata.html#insertItem">insertItem</a>( "Save pixmap", savepixmap );
<a name="x428"></a> file-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
file-><a href="qmenudata.html#insertItem">insertItem</a>( "E&xit", qApp, SLOT(<a href="qapplication.html#quit">quit</a>()), CTRL+Key_Q );
edit = new <a href="qpopupmenu.html">QPopupMenu</a>( menubar );
menubar-><a href="qmenudata.html#insertItem">insertItem</a>( "&Edit", edit );
edit-><a href="qmenudata.html#insertItem">insertItem</a>("&Copy", this, SLOT(copy()), CTRL+Key_C);
edit-><a href="qmenudata.html#insertItem">insertItem</a>("&Paste", this, SLOT(paste()), CTRL+Key_V);
edit-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
edit-><a href="qmenudata.html#insertItem">insertItem</a>("&Horizontal flip", this, SLOT(hFlip()), ALT+Key_H);
edit-><a href="qmenudata.html#insertItem">insertItem</a>("&Vertical flip", this, SLOT(vFlip()), ALT+Key_V);
edit-><a href="qmenudata.html#insertItem">insertItem</a>("&Rotate 180", this, SLOT(rot180()), ALT+Key_R);
edit-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
edit-><a href="qmenudata.html#insertItem">insertItem</a>("&Text...", this, SLOT(editText()));
edit-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
t1 = edit-><a href="qmenudata.html#insertItem">insertItem</a>( "Convert to &1 bit", this, SLOT(to1Bit()) );
t8 = edit-><a href="qmenudata.html#insertItem">insertItem</a>( "Convert to &8 bit", this, SLOT(to8Bit()) );
t32 = edit-><a href="qmenudata.html#insertItem">insertItem</a>( "Convert to &32 bit", this, SLOT(to32Bit()) );
options = new <a href="qpopupmenu.html">QPopupMenu</a>( menubar );
menubar-><a href="qmenudata.html#insertItem">insertItem</a>( "&Options", options );
ac = options-><a href="qmenudata.html#insertItem">insertItem</a>( "AutoColor" );
co = options-><a href="qmenudata.html#insertItem">insertItem</a>( "ColorOnly" );
mo = options-><a href="qmenudata.html#insertItem">insertItem</a>( "MonoOnly" );
options-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
fd = options-><a href="qmenudata.html#insertItem">insertItem</a>( "DiffuseDither" );
bd = options-><a href="qmenudata.html#insertItem">insertItem</a>( "OrderedDither" );
td = options-><a href="qmenudata.html#insertItem">insertItem</a>( "ThresholdDither" );
options-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
ta = options-><a href="qmenudata.html#insertItem">insertItem</a>( "ThresholdAlphaDither" );
ba = options-><a href="qmenudata.html#insertItem">insertItem</a>( "OrderedAlphaDither" );
fa = options-><a href="qmenudata.html#insertItem">insertItem</a>( "DiffuseAlphaDither" );
options-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
ad = options-><a href="qmenudata.html#insertItem">insertItem</a>( "PreferDither" );
dd = options-><a href="qmenudata.html#insertItem">insertItem</a>( "AvoidDither" );
options-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
ss = options-><a href="qmenudata.html#insertItem">insertItem</a>( "Smooth scaling" );
cc = options-><a href="qmenudata.html#insertItem">insertItem</a>( "Use color context" );
<a name="x409"></a> if ( QApplication::<a href="qapplication.html#colorSpec">colorSpec</a>() == QApplication::ManyColor )
<a name="x431"></a> options-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( cc, FALSE );
<a name="x442"></a> options-><a href="qpopupmenu.html#setCheckable">setCheckable</a>( TRUE );
setMenuItemFlags();
menubar-><a href="qmenudata.html#insertSeparator">insertSeparator</a>();
<a href="qpopupmenu.html">QPopupMenu</a>* help = new <a href="qpopupmenu.html">QPopupMenu</a>( menubar );
menubar-><a href="qmenudata.html#insertItem">insertItem</a>( "&Help", help );
help-><a href="qmenudata.html#insertItem">insertItem</a>( "Help!", this, SLOT(giveHelp()), CTRL+Key_H );
<a href="qobject.html#connect">connect</a>( options, SIGNAL(<a href="qpopupmenu.html#activated">activated</a>(int)), this, SLOT(doOption(int)) );
status = new <a href="qlabel.html">QLabel</a>(this);
status-><a href="qframe.html#setFrameStyle">setFrameStyle</a>( QFrame::WinPanel | QFrame::Sunken );
<a name="x454"></a> status-><a href="qwidget.html#setFixedHeight">setFixedHeight</a>( <a href="qwidget.html#fontMetrics">fontMetrics</a>().height() + 4 );
<a href="qwidget.html#setMouseTracking">setMouseTracking</a>( TRUE );
}
ImageViewer::~ImageViewer()
{
if ( alloc_context )
<a name="x413"></a> QColor::<a href="qcolor.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="f207"></a>ImageViewer::doOption(int item)
{
if ( item == ss || item == cc ) {
// Toggle
<a name="x429"></a> bool newbool = !options-><a href="qmenudata.html#isItemChecked">isItemChecked</a>(item);
<a name="x430"></a> options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>(item, newbool);
// And reconvert...
reconvertImage();
<a href="qwidget.html#repaint">repaint</a>(image.hasAlphaBuffer()); // show image in widget
return;
}
if ( options-><a href="qmenudata.html#isItemChecked">isItemChecked</a>( item ) ) return; // They are all radio buttons
int ocf = conversion_flags;
if ( item == ac ) {
conversion_flags = conversion_flags & ~ColorMode_Mask | AutoColor;
} else if ( item == co ) {
conversion_flags = conversion_flags & ~ColorMode_Mask | ColorOnly;
} else if ( item == mo ) {
conversion_flags = conversion_flags & ~ColorMode_Mask | MonoOnly;
} else if ( item == fd ) {
conversion_flags = conversion_flags & ~Dither_Mask | DiffuseDither;
} else if ( item == bd ) {
conversion_flags = conversion_flags & ~Dither_Mask | OrderedDither;
} else if ( item == td ) {
conversion_flags = conversion_flags & ~Dither_Mask | ThresholdDither;
} else if ( item == ta ) {
conversion_flags = conversion_flags & ~AlphaDither_Mask | ThresholdAlphaDither;
} else if ( item == fa ) {
conversion_flags = conversion_flags & ~AlphaDither_Mask | DiffuseAlphaDither;
} else if ( item == ba ) {
conversion_flags = conversion_flags & ~AlphaDither_Mask | OrderedAlphaDither;
} else if ( item == ad ) {
conversion_flags = conversion_flags & ~DitherMode_Mask | PreferDither;
} else if ( item == dd ) {
conversion_flags = conversion_flags & ~DitherMode_Mask | AvoidDither;
}
if ( ocf != conversion_flags ) {
setMenuItemFlags();
// And reconvert...
reconvertImage();
<a href="qwidget.html#repaint">repaint</a>(image.hasAlphaBuffer()); // show image in widget
}
}
/*
Set the options menu to reflect the conversion_flags value.
*/
void <a name="f208"></a>ImageViewer::setMenuItemFlags()
{
// File
bool valid_image = pm.size() != QSize( 0, 0 );
file-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( si, valid_image );
file-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( sp, valid_image );
// Edit
edit-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( t1, image.depth() != 1 );
edit-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( t8, image.depth() != 8 );
edit-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( t32, image.depth() != 32 );
// Options
bool may_need_color_dithering =
!valid_image
|| image.depth() == 32 && QPixmap::<a href="qpixmap.html#defaultDepth">defaultDepth</a>() < 24;
bool may_need_dithering = may_need_color_dithering
|| image.depth() > 1 && options-><a href="qmenudata.html#isItemChecked">isItemChecked</a>(mo)
|| image.depth() > 1 && QPixmap::<a href="qpixmap.html#defaultDepth">defaultDepth</a>() == 1;
bool has_alpha_mask = !valid_image || image.hasAlphaBuffer();
options-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( fd, may_need_dithering );
options-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( bd, may_need_dithering );
options-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( td, may_need_dithering );
options-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( ta, has_alpha_mask );
options-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( fa, has_alpha_mask );
options-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( ba, has_alpha_mask );
options-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( ad, may_need_color_dithering );
options-><a href="qmenudata.html#setItemEnabled">setItemEnabled</a>( dd, may_need_color_dithering );
options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( ac, (conversion_flags & ColorMode_Mask) == AutoColor );
options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( co, (conversion_flags & ColorMode_Mask) == ColorOnly );
options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( mo, (conversion_flags & ColorMode_Mask) == MonoOnly );
options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( fd, (conversion_flags & Dither_Mask) == DiffuseDither );
options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( bd, (conversion_flags & Dither_Mask) == OrderedDither );
options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( td, (conversion_flags & Dither_Mask) == ThresholdDither );
options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( ta, (conversion_flags & AlphaDither_Mask) == ThresholdAlphaDither );
options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( fa, (conversion_flags & AlphaDither_Mask) == DiffuseAlphaDither );
options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( ba, (conversion_flags & AlphaDither_Mask) == OrderedAlphaDither );
options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( ad, (conversion_flags & DitherMode_Mask) == PreferDither );
options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( dd, (conversion_flags & DitherMode_Mask) == AvoidDither );
}
void <a name="f209"></a>ImageViewer::updateStatus()
{
if ( pm.size() == QSize( 0, 0 ) ) {
if ( filename )
status-><a href="qlabel.html#setText">setText</a>("Could not load image");
else
status-><a href="qlabel.html#setText">setText</a>("No image - select Open from File menu.");
} else {
<a href="qstring.html">QString</a> message, moremsg;
message.<a href="qstring.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() > 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<256; i++)
alpha[i] = FALSE;
for (i=0; i<image.numColors(); i++) {
int alevel = image.color(i) >> 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-><a href="qlabel.html#setText">setText</a>(message);
}
}
/*
This function saves the image.
*/
void <a name="f210"></a>ImageViewer::saveImage( int item )
{
<a name="x432"></a> const char* fmt = saveimage-><a href="qmenudata.html#text">text</a>(item);
<a name="x419"></a> <a href="qstring.html">QString</a> savefilename = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>(QString::null, <a href="qstring.html#QString-null">QString::null</a>,
this, filename);
if ( !savefilename.<a href="qstring.html#isEmpty">isEmpty</a>() )
if ( !image.save( savefilename, fmt ) )
<a name="x433"></a> QMessageBox::<a href="qmessagebox.html#warning">warning</a>( this, "Save failed", "Error saving file" );
}
/*
This function saves the converted image.
*/
void <a name="f211"></a>ImageViewer::savePixmap( int item )
{
const char* fmt = savepixmap-><a href="qmenudata.html#text">text</a>(item);
<a href="qstring.html">QString</a> savefilename = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>(QString::null,
QString::null, this, filename);
if ( !savefilename.<a href="qstring.html#isEmpty">isEmpty</a>() )
if ( !pmScaled.save( savefilename, fmt ) )
QMessageBox::<a href="qmessagebox.html#warning">warning</a>( this, "Save failed", "Error saving file" );
}
void <a name="f212"></a>ImageViewer::newWindow()
{
ImageViewer* that = new ImageViewer(0, "new window", WDestructiveClose);
that->options-><a href="qmenudata.html#setItemChecked">setItemChecked</a>( that->cc, useColorContext() );
that-><a href="qwidget.html#show">show</a>();
}
/*
This function is the slot for processing the Open menu item.
*/
void <a name="f213"></a>ImageViewer::openFile()
{
<a name="x418"></a> <a href="qstring.html">QString</a> newfilename = QFileDialog::<a href="qfiledialog.html#getOpenFileName">getOpenFileName</a>();
if ( !newfilename.<a href="qstring.html#isEmpty">isEmpty</a>() ) {
loadImage( newfilename ) ;
<a href="qwidget.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="f214"></a>ImageViewer::loadImage( const char *fileName )
{
filename = fileName;
bool ok = FALSE;
if ( filename ) {
<a name="x412"></a> QApplication::<a href="qapplication.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="qwidget.html#setCaption">setCaption</a>( filename ); // set window caption
int w = pm.width();
int h = pm.height();
const int reasonable_width = 128;
if ( w < reasonable_width ) {
// Integer scale up to something reasonable
int multiply = ( reasonable_width + w - 1 ) / w;
w *= multiply;
h *= multiply;
}
<a name="x447"></a><a name="x425"></a> h += menubar-><a href="qmenubar.html#heightForWidth">heightForWidth</a>(w) + status-><a href="qwidget.html#height">height</a>();
<a href="qwidget.html#resize">resize</a>( w, h ); // we resize to fit image
} else {
pm.resize(0,0); // couldn't load image
<a href="qwidget.html#update">update</a>();
}
<a name="x411"></a> QApplication::<a href="qapplication.html#restoreOverrideCursor">restoreOverrideCursor</a>(); // restore original cursor
}
updateStatus();
setMenuItemFlags();
return ok;
}
bool <a name="f215"></a>ImageViewer::reconvertImage()
{
bool success = FALSE;
if ( image.isNull() ) return FALSE;
if ( alloc_context ) {
QColor::<a href="qcolor.html#destroyAllocContext">destroyAllocContext</a>( alloc_context );
alloc_context = 0;
}
if ( useColorContext() ) {
<a name="x414"></a> alloc_context = QColor::<a href="qcolor.html#enterAllocContext">enterAllocContext</a>();
// Clear the image to hide flickering palette
<a href="qpainter.html">QPainter</a> painter(this);
<a name="x438"></a> painter.<a href="qpainter.html#eraseRect">eraseRect</a>(0, menubar-><a href="qmenubar.html#heightForWidth">heightForWidth</a>( <a href="qwidget.html#width">width</a>() ), width(), height());
}
QApplication::<a href="qapplication.html#setOverrideCursor">setOverrideCursor</a>( waitCursor ); // this might take time
if ( pm.convertFromImage(image, conversion_flags) )
{
pmScaled = QPixmap();
scale();
<a href="qwidget.html#resize">resize</a>( <a href="qwidget.html#width">width</a>(), height() );
success = TRUE; // load successful
} else {
pm.resize(0,0); // couldn't load image
}
updateStatus();
setMenuItemFlags();
QApplication::<a href="qapplication.html#restoreOverrideCursor">restoreOverrideCursor</a>(); // restore original cursor
if ( useColorContext() )
<a name="x415"></a> QColor::<a href="qcolor.html#leaveAllocContext">leaveAllocContext</a>();
return success; // TRUE if loaded OK
}
bool <a name="f216"></a>ImageViewer::smooth() const
{
return options-><a href="qmenudata.html#isItemChecked">isItemChecked</a>(ss);
}
bool <a name="f217"></a>ImageViewer::useColorContext() const
{
return options-><a href="qmenudata.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="f218"></a>ImageViewer::scale()
{
int h = <a href="qwidget.html#height">height</a>() - menubar-><a href="qmenubar.html#heightForWidth">heightForWidth</a>( <a href="qwidget.html#width">width</a>() ) - status-><a href="qwidget.html#height">height</a>();
if ( image.isNull() ) return;
QApplication::<a href="qapplication.html#setOverrideCursor">setOverrideCursor</a>( waitCursor ); // this might take time
if ( <a href="qwidget.html#width">width</a>() == pm.width() && h == pm.height() )
{ // no need to scale if widget
pmScaled = pm; // size equals pixmap size
} else {
if (smooth()) {
pmScaled.convertFromImage(image.smoothScale(<a href="qwidget.html#width">width</a>(), h),
conversion_flags);
} else {
<a href="qwmatrix.html">QWMatrix</a> m; // transformation matrix
<a name="x457"></a> m.<a href="qwmatrix.html#scale">scale</a>(((double)<a href="qwidget.html#width">width</a>())/pm.width(),// define scale factors
((double)h)/pm.height());
pmScaled = pm.xForm( m ); // create scaled pixmap
}
}
QApplication::<a href="qapplication.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.
*/
void ImageViewer::<a href="qwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">QResizeEvent</a> * )
{
<a name="x455"></a> status-><a href="qwidget.html#setGeometry">setGeometry</a>(0, height() - status-><a href="qwidget.html#height">height</a>(),
<a href="qwidget.html#width">width</a>(), status-><a href="qwidget.html#height">height</a>());
if ( pm.size() == QSize( 0, 0 ) ) // we couldn't load the image
return;
int h = <a href="qwidget.html#height">height</a>() - menubar-><a href="qmenubar.html#heightForWidth">heightForWidth</a>( <a href="qwidget.html#width">width</a>() ) - status-><a href="qwidget.html#height">height</a>();
if ( <a href="qwidget.html#width">width</a>() != pmScaled.width() || h != pmScaled.height())
{ // if new size,
scale(); // scale pmScaled to window
updateStatus();
}
if ( image.hasAlphaBuffer() )
<a href="qwidget.html#erase">erase</a>();
}
bool <a name="f219"></a>ImageViewer::convertEvent( <a href="qmouseevent.html">QMouseEvent</a>* e, int& x, int& y)
{
if ( pm.size() != QSize( 0, 0 ) ) {
int h = <a href="qwidget.html#height">height</a>() - menubar-><a href="qmenubar.html#heightForWidth">heightForWidth</a>( <a href="qwidget.html#width">width</a>() ) - status-><a href="qwidget.html#height">height</a>();
<a name="x435"></a> int nx = e-><a href="qmouseevent.html#x">x</a>() * image.width() / width();
<a name="x436"></a> int ny = (e-><a href="qmouseevent.html#y">y</a>()-menubar-><a href="qmenubar.html#heightForWidth">heightForWidth</a>( <a href="qwidget.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="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e )
{
may_be_other = convertEvent(e, clickx, clicky);
}
<a name="x450"></a>void ImageViewer::<a href="qwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * )
{
if ( may_be_other )
other = this;
}
/*
Record the pixel position of interest.
*/
void ImageViewer::<a href="qwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e )
{
if (convertEvent(e,pickx,picky)) {
updateStatus();
<a name="x434"></a> if ((e-><a href="qmouseevent.html#state">state</a>()&LeftButton)) {
may_be_other = FALSE;
if ( clickx >= 0 && 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="qwidget.html#paintEvent">paintEvent</a>( <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);
<a name="x440"></a><a name="x439"></a> painter.<a href="qpainter.html#setClipRect">setClipRect</a>(e-><a href="qpaintevent.html#rect">rect</a>());
<a name="x437"></a> painter.<a href="qpainter.html#drawPixmap">drawPixmap</a>(0, menubar-><a href="qmenubar.html#heightForWidth">heightForWidth</a>( <a href="qwidget.html#width">width</a>() ), pmScaled);
}
}
/*
Explain anything that might be confusing.
*/
void <a name="f220"></a>ImageViewer::giveHelp()
{
if (!helpmsg) {
<a href="qstring.html">QString</a> helptext =
"<b>Usage:</b> <tt>showimg [-m] <i>filename ...</i></tt>"
"<blockquote>"
"<tt>-m</tt> - use <i>ManyColor</i> color spec"
"</blockquote>"
"<p>Supported input formats:"
"<blockquote>";
<a name="x421"></a> helptext += QImage::<a href="qimage.html#inputFormatList">inputFormatList</a>().join(", ");
helptext += "</blockquote>";
helpmsg = new <a href="qmessagebox.html">QMessageBox</a>( "Help", helptext,
QMessageBox::Information, QMessageBox::Ok, 0, 0, 0, 0, FALSE );
}
<a name="x417"></a> helpmsg-><a href="qdialog.html#show">show</a>();
<a name="x452"></a> helpmsg-><a href="qwidget.html#raise">raise</a>();
}
void <a name="f221"></a>ImageViewer::copyFrom(ImageViewer* s)
{
if ( clickx >= 0 ) {
int dx = clickx;
int dy = clicky;
int sx = s->clickx;
int sy = s->clicky;
int sw = QABS(clickx - pickx)+1;
int sh = QABS(clicky - picky)+1;
if ( clickx > pickx ) {
dx = pickx;
sx -= sw-1;
}
if ( clicky > picky ) {
dy = picky;
sy -= sh-1;
}
<a href="qpaintdevice.html#bitBlt-2">bitBlt</a>( &image, dx, dy, &s->image, sx, sy, sw, sh );
reconvertImage();
<a href="qwidget.html#repaint">repaint</a>( image.hasAlphaBuffer() );
}
}
ImageViewer* ImageViewer::other = 0;
void <a name="f222"></a>ImageViewer::hFlip()
{
setImage(image.mirror(TRUE,FALSE));
}
void <a name="f223"></a>ImageViewer::vFlip()
{
setImage(image.mirror(FALSE,TRUE));
}
void <a name="f224"></a>ImageViewer::rot180()
{
setImage(image.mirror(TRUE,TRUE));
}
void <a name="f225"></a>ImageViewer::copy()
{
#ifndef QT_NO_MIMECLIPBOARD
<a name="x408"></a> QApplication::<a href="qapplication.html#clipboard">clipboard</a>()->setImage(image); // Less information loss
#endif
}
void <a name="f226"></a>ImageViewer::paste()
{
#ifndef QT_NO_MIMECLIPBOARD
<a href="qimage.html">QImage</a> p = QApplication::<a href="qapplication.html#clipboard">clipboard</a>()->image();
<a name="x422"></a> if ( !p.<a href="qimage.html#isNull">isNull</a>() ) {
filename = "pasted";
setImage(p);
}
#endif
}
void <a name="f227"></a>ImageViewer::setImage(const <a href="qimage.html">QImage</a>& newimage)
{
image = newimage;
pickx = -1;
clickx = -1;
<a href="qwidget.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 < reasonable_width ) {
// Integer scale up to something reasonable
int multiply = ( reasonable_width + w - 1 ) / w;
w *= multiply;
h *= multiply;
}
h += menubar-><a href="qmenubar.html#heightForWidth">heightForWidth</a>(w) + status-><a href="qwidget.html#height">height</a>();
<a href="qwidget.html#resize">resize</a>( w, h ); // we resize to fit image
reconvertImage();
<a href="qwidget.html#repaint">repaint</a>( image.hasAlphaBuffer() );
updateStatus();
setMenuItemFlags();
}
void <a name="f228"></a>ImageViewer::editText()
{
ImageTextEditor editor(image,this);
<a name="x416"></a> editor.<a href="qdialog.html#exec">exec</a>();
}
void <a name="f229"></a>ImageViewer::to1Bit()
{
toBitDepth(1);
}
void <a name="f230"></a>ImageViewer::to8Bit()
{
toBitDepth(8);
}
void <a name="f231"></a>ImageViewer::to32Bit()
{
toBitDepth(32);
}
void <a name="f232"></a>ImageViewer::toBitDepth(int d)
{
image = image.convertDepth(d);
reconvertImage();
<a href="qwidget.html#repaint">repaint</a>( image.hasAlphaBuffer() );
}
</pre>
<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id: qt/main.cpp 3.0.2 edited Oct 12 12:18 $
**
** 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 <<a href="qapplication-h.html">qapplication.h</a>>
#include <<a href="qimage-h.html">qimage.h</a>>
int main( int argc, char **argv )
{
if ( argc > 1 && QString(argv[1]) == "-m" ) {
<a name="x461"></a> QApplication::<a href="qapplication.html#setColorSpec">setColorSpec</a>( QApplication::ManyColor );
argc--;
argv++;
}
else if ( argc > 1 && QString(argv[1]) == "-n" ) {
QApplication::<a href="qapplication.html#setColorSpec">setColorSpec</a>( QApplication::NormalColor );
argc--;
argv++;
}
else {
QApplication::<a href="qapplication.html#setColorSpec">setColorSpec</a>( QApplication::CustomColor );
}
<a name="x462"></a> QApplication::<a href="qapplication.html#setFont">setFont</a>( QFont("Helvetica", 12) );
<a href="qapplication.html">QApplication</a> a( argc, argv );
ImageIconProvider iip;
<a name="x463"></a> QFileDialog::<a href="qfiledialog.html#setIconProvider">setIconProvider</a>( &iip );
if ( argc <= 1 ) {
// Create a window which looks after its own existence.
ImageViewer *w =
new ImageViewer(0, "new window", Qt::WDestructiveClose | Qt::WResizeNoErase );
<a name="x465"></a> w-><a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Image Viewer");
w-><a href="qwidget.html#show">show</a>();
} else {
for ( int i=1; i<argc; i++ ) {
// Create a window which looks after its own existence.
ImageViewer *w =
new ImageViewer(0, argv[i], Qt::WDestructiveClose | Qt::WResizeNoErase );
w-><a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Image Viewer");
w->loadImage( argv[i] );
w-><a href="qwidget.html#show">show</a>();
}
}
<a name="x460"></a><a name="x459"></a> QObject::<a href="qobject.html#connect">connect</a>(qApp, SIGNAL(<a href="qapplication.html#lastWindowClosed">lastWindowClosed</a>()), qApp, SLOT(<a href="qapplication.html#quit">quit</a>()));
return a.<a href="qapplication.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 © 2001
<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 3.0.2</div>
</table></div></address></body>
</html>
distrib
>
Mandriva
>
8.2
>
i586
>
media
>
contrib
>
by-pkgid
>
112b0974ad288f6cd55bf971ee6026a9
>
files
>
2138
