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884 lines
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884 lines
40 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/showimg/showimg.doc:4 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>Show Image</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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a:link { color: #004faf; text-decoration: none }
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a:visited { color: #672967; text-decoration: none }
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body { background: #ffffff; color: black; }
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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| <a href="mainclasses.html">
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<font color="#004faf">Main Classes</font></a>
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| <a href="annotated.html">
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<font color="#004faf">Annotated</font></a>
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| <a href="groups.html">
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<font color="#004faf">Grouped Classes</font></a>
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| <a href="functions.html">
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<font color="#004faf">Functions</font></a>
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</td>
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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>
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<p>
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This example reads and displays an image in any supported image
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format (GIF, BMP, PPM, XMP, etc.).
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<p> <hr>
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<p> Header file:
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<p> <pre>/****************************************************************************
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** $Id: qt/showimg.h 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#ifndef SHOWIMG_H
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#define SHOWIMG_H
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#include <<a href="qwidget-h.html">ntqwidget.h</a>>
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#include <<a href="qimage-h.html">ntqimage.h</a>>
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class TQLabel;
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class TQMenuBar;
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class TQPopupMenu;
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class ImageViewer : public <a href="ntqwidget.html">TQWidget</a>
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{
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<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
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public:
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ImageViewer( <a href="ntqwidget.html">TQWidget</a> *parent=0, const char *name=0, int wFlags=0 );
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~ImageViewer();
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bool loadImage( const <a href="ntqstring.html">TQString</a>& );
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protected:
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void paintEvent( <a href="qpaintevent.html">TQPaintEvent</a> * );
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void resizeEvent( <a href="qresizeevent.html">TQResizeEvent</a> * );
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void mousePressEvent( <a href="qmouseevent.html">TQMouseEvent</a> * );
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void mouseReleaseEvent( <a href="qmouseevent.html">TQMouseEvent</a> * );
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void mouseMoveEvent( <a href="qmouseevent.html">TQMouseEvent</a> * );
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private:
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void scale();
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int conversion_flags;
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bool smooth() const;
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bool useColorContext() const;
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int alloc_context;
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bool convertEvent( <a href="qmouseevent.html">TQMouseEvent</a>* e, int& x, int& y );
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<a href="ntqstring.html">TQString</a> filename;
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<a href="ntqimage.html">TQImage</a> image; // the loaded image
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<a href="ntqpixmap.html">TQPixmap</a> pm; // the converted pixmap
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<a href="ntqpixmap.html">TQPixmap</a> pmScaled; // the scaled pixmap
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<a href="ntqmenubar.html">TQMenuBar</a> *menubar;
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<a href="ntqpopupmenu.html">TQPopupMenu</a> *file;
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<a href="ntqpopupmenu.html">TQPopupMenu</a> *saveimage;
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<a href="ntqpopupmenu.html">TQPopupMenu</a> *savepixmap;
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<a href="ntqpopupmenu.html">TQPopupMenu</a> *edit;
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<a href="ntqpopupmenu.html">TQPopupMenu</a> *options;
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<a href="ntqwidget.html">TQWidget</a> *helpmsg;
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<a href="ntqlabel.html">TQLabel</a> *status;
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int si, sp, ac, co, mo, fd, bd, // Menu item ids
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td, ta, ba, fa, au, ad, dd,
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ss, cc, t1, t8, t32;
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void updateStatus();
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void setMenuItemFlags();
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bool reconvertImage();
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int pickx, picky;
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int clickx, clicky;
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bool may_be_other;
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static ImageViewer* other;
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void setImage(const <a href="ntqimage.html">TQImage</a>& newimage);
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private slots:
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void to1Bit();
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void to8Bit();
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void to32Bit();
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void toBitDepth(int);
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void copy();
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void paste();
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void hFlip();
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void vFlip();
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void rot180();
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void editText();
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void newWindow();
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void openFile();
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void saveImage(int);
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void savePixmap(int);
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void giveHelp();
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void doOption(int);
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void copyFrom(ImageViewer*);
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};
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#endif // SHOWIMG_H
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</pre>
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<p> <hr>
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<p> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/showimg.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "showimg.h"
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#include "imagetexteditor.h"
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#include <<a href="qmenubar-h.html">ntqmenubar.h</a>>
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#include <<a href="qfiledialog-h.html">ntqfiledialog.h</a>>
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#include <<a href="qmessagebox-h.html">ntqmessagebox.h</a>>
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#include <<a href="qpopupmenu-h.html">ntqpopupmenu.h</a>>
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#include <<a href="qlabel-h.html">ntqlabel.h</a>>
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#include <<a href="qpainter-h.html">ntqpainter.h</a>>
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#include <<a href="qapplication-h.html">ntqapplication.h</a>>
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#include <<a href="qclipboard-h.html">ntqclipboard.h</a>>
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/*
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In the constructor, we just pass the standard parameters on to
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TQWidget.
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The menu uses a single slot to simplify the process of adding
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more items to the options menu.
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*/
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<a name="f405"></a>ImageViewer::ImageViewer( <a href="ntqwidget.html">TQWidget</a> *parent, const char *name, int wFlags )
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: <a href="ntqwidget.html">TQWidget</a>( parent, name, wFlags ),
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conversion_flags( PreferDither ),
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helpmsg( 0 )
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{
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pickx = -1;
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picky = -1;
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clickx = -1;
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clicky = -1;
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alloc_context = 0;
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menubar = new <a href="ntqmenubar.html">TQMenuBar</a>(this);
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<a name="x1326"></a> menubar-><a href="ntqmenubar.html#setSeparator">setSeparator</a>( TQMenuBar::InWindowsStyle );
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<a name="x1323"></a> <a href="ntqstrlist.html">TQStrList</a> fmt = TQImage::<a href="ntqimage.html#outputFormats">outputFormats</a>();
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saveimage = new <a href="ntqpopupmenu.html">TQPopupMenu</a>( menubar );
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savepixmap = new <a href="ntqpopupmenu.html">TQPopupMenu</a>( menubar );
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<a name="x1344"></a><a name="x1343"></a> for (const char* f = fmt.<a href="ntqptrlist.html#first">first</a>(); f; f = fmt.<a href="ntqptrlist.html#next">next</a>()) {
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<a name="x1327"></a> saveimage-><a href="ntqmenudata.html#insertItem">insertItem</a>( f );
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savepixmap-><a href="ntqmenudata.html#insertItem">insertItem</a>( f );
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}
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<a name="x1341"></a> <a href="ntqobject.html#connect">connect</a>( saveimage, TQ_SIGNAL(<a href="ntqpopupmenu.html#activated">activated</a>(int)), this, TQ_SLOT(saveImage(int)) );
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<a href="ntqobject.html#connect">connect</a>( savepixmap, TQ_SIGNAL(<a href="ntqpopupmenu.html#activated">activated</a>(int)), this, TQ_SLOT(savePixmap(int)) );
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file = new <a href="ntqpopupmenu.html">TQPopupMenu</a>( menubar );
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menubar-><a href="ntqmenudata.html#insertItem">insertItem</a>( "&File", file );
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file-><a href="ntqmenudata.html#insertItem">insertItem</a>( "&New window", this, TQ_SLOT(newWindow()), CTRL+Key_N );
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file-><a href="ntqmenudata.html#insertItem">insertItem</a>( "&Open...", this, TQ_SLOT(openFile()), CTRL+Key_O );
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si = file-><a href="ntqmenudata.html#insertItem">insertItem</a>( "Save image", saveimage );
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sp = file-><a href="ntqmenudata.html#insertItem">insertItem</a>( "Save pixmap", savepixmap );
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<a name="x1328"></a> file-><a href="ntqmenudata.html#insertSeparator">insertSeparator</a>();
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file-><a href="ntqmenudata.html#insertItem">insertItem</a>( "E&xit", tqApp, TQ_SLOT(<a href="ntqapplication.html#quit">quit</a>()), CTRL+Key_Q );
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edit = new <a href="ntqpopupmenu.html">TQPopupMenu</a>( menubar );
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menubar-><a href="ntqmenudata.html#insertItem">insertItem</a>( "&Edit", edit );
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edit-><a href="ntqmenudata.html#insertItem">insertItem</a>("&Copy", this, TQ_SLOT(copy()), CTRL+Key_C);
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edit-><a href="ntqmenudata.html#insertItem">insertItem</a>("&Paste", this, TQ_SLOT(paste()), CTRL+Key_V);
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edit-><a href="ntqmenudata.html#insertSeparator">insertSeparator</a>();
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edit-><a href="ntqmenudata.html#insertItem">insertItem</a>("&Horizontal flip", this, TQ_SLOT(hFlip()), ALT+Key_H);
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edit-><a href="ntqmenudata.html#insertItem">insertItem</a>("&Vertical flip", this, TQ_SLOT(vFlip()), ALT+Key_V);
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edit-><a href="ntqmenudata.html#insertItem">insertItem</a>("&Rotate 180", this, TQ_SLOT(rot180()), ALT+Key_R);
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edit-><a href="ntqmenudata.html#insertSeparator">insertSeparator</a>();
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edit-><a href="ntqmenudata.html#insertItem">insertItem</a>("&Text...", this, TQ_SLOT(editText()));
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edit-><a href="ntqmenudata.html#insertSeparator">insertSeparator</a>();
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t1 = edit-><a href="ntqmenudata.html#insertItem">insertItem</a>( "Convert to &1 bit", this, TQ_SLOT(to1Bit()) );
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t8 = edit-><a href="ntqmenudata.html#insertItem">insertItem</a>( "Convert to &8 bit", this, TQ_SLOT(to8Bit()) );
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t32 = edit-><a href="ntqmenudata.html#insertItem">insertItem</a>( "Convert to &32 bit", this, TQ_SLOT(to32Bit()) );
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options = new <a href="ntqpopupmenu.html">TQPopupMenu</a>( menubar );
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menubar-><a href="ntqmenudata.html#insertItem">insertItem</a>( "&Options", options );
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ac = options-><a href="ntqmenudata.html#insertItem">insertItem</a>( "AutoColor" );
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co = options-><a href="ntqmenudata.html#insertItem">insertItem</a>( "ColorOnly" );
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mo = options-><a href="ntqmenudata.html#insertItem">insertItem</a>( "MonoOnly" );
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options-><a href="ntqmenudata.html#insertSeparator">insertSeparator</a>();
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fd = options-><a href="ntqmenudata.html#insertItem">insertItem</a>( "DiffuseDither" );
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bd = options-><a href="ntqmenudata.html#insertItem">insertItem</a>( "OrderedDither" );
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td = options-><a href="ntqmenudata.html#insertItem">insertItem</a>( "ThresholdDither" );
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options-><a href="ntqmenudata.html#insertSeparator">insertSeparator</a>();
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ta = options-><a href="ntqmenudata.html#insertItem">insertItem</a>( "ThresholdAlphaDither" );
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ba = options-><a href="ntqmenudata.html#insertItem">insertItem</a>( "OrderedAlphaDither" );
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fa = options-><a href="ntqmenudata.html#insertItem">insertItem</a>( "DiffuseAlphaDither" );
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options-><a href="ntqmenudata.html#insertSeparator">insertSeparator</a>();
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ad = options-><a href="ntqmenudata.html#insertItem">insertItem</a>( "PreferDither" );
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dd = options-><a href="ntqmenudata.html#insertItem">insertItem</a>( "AvoidDither" );
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options-><a href="ntqmenudata.html#insertSeparator">insertSeparator</a>();
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ss = options-><a href="ntqmenudata.html#insertItem">insertItem</a>( "Smooth scaling" );
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cc = options-><a href="ntqmenudata.html#insertItem">insertItem</a>( "Use color context" );
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<a name="x1309"></a> if ( TQApplication::<a href="ntqapplication.html#colorSpec">colorSpec</a>() == TQApplication::ManyColor )
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<a name="x1331"></a> options-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( cc, FALSE );
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<a name="x1342"></a> options-><a href="ntqpopupmenu.html#setCheckable">setCheckable</a>( TRUE );
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setMenuItemFlags();
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menubar-><a href="ntqmenudata.html#insertSeparator">insertSeparator</a>();
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<a href="ntqpopupmenu.html">TQPopupMenu</a>* help = new <a href="ntqpopupmenu.html">TQPopupMenu</a>( menubar );
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menubar-><a href="ntqmenudata.html#insertItem">insertItem</a>( "&Help", help );
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help-><a href="ntqmenudata.html#insertItem">insertItem</a>( "Help!", this, TQ_SLOT(giveHelp()), CTRL+Key_H );
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<a href="ntqobject.html#connect">connect</a>( options, TQ_SIGNAL(<a href="ntqpopupmenu.html#activated">activated</a>(int)), this, TQ_SLOT(doOption(int)) );
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status = new <a href="ntqlabel.html">TQLabel</a>(this);
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status-><a href="ntqframe.html#setFrameStyle">setFrameStyle</a>( TQFrame::WinPanel | TQFrame::Sunken );
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<a name="x1354"></a> status-><a href="ntqwidget.html#setFixedHeight">setFixedHeight</a>( <a href="ntqwidget.html#fontMetrics">fontMetrics</a>().height() + 4 );
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<a href="ntqwidget.html#setMouseTracking">setMouseTracking</a>( TRUE );
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}
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ImageViewer::~ImageViewer()
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{
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if ( alloc_context )
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<a name="x1313"></a> TQColor::<a href="ntqcolor.html#destroyAllocContext">destroyAllocContext</a>( alloc_context );
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if ( other == this )
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other = 0;
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}
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/*
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This function modifies the conversion_flags when an options menu item
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is selected, then ensures all menu items are up to date, and reconverts
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the image if possibly necessary.
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*/
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void <a name="f406"></a>ImageViewer::doOption(int item)
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{
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if ( item == ss || item == cc ) {
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// Toggle
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<a name="x1329"></a> bool newbool = !options-><a href="ntqmenudata.html#isItemChecked">isItemChecked</a>(item);
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<a name="x1330"></a> options-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>(item, newbool);
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// And reconvert...
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reconvertImage();
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<a href="ntqwidget.html#repaint">repaint</a>(image.hasAlphaBuffer()); // show image in widget
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return;
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}
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if ( options-><a href="ntqmenudata.html#isItemChecked">isItemChecked</a>( item ) ) return; // They are all radio buttons
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int ocf = conversion_flags;
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if ( item == ac ) {
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conversion_flags = ( conversion_flags & ~ColorMode_Mask ) | AutoColor;
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} else if ( item == co ) {
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conversion_flags = ( conversion_flags & ~ColorMode_Mask ) | ColorOnly;
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} else if ( item == mo ) {
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conversion_flags = ( conversion_flags & ~ColorMode_Mask ) | MonoOnly;
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} else if ( item == fd ) {
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conversion_flags = ( conversion_flags & ~Dither_Mask ) | DiffuseDither;
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} else if ( item == bd ) {
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conversion_flags = ( conversion_flags & ~Dither_Mask ) | OrderedDither;
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} else if ( item == td ) {
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conversion_flags = ( conversion_flags & ~Dither_Mask ) | ThresholdDither;
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} else if ( item == ta ) {
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conversion_flags = ( conversion_flags & ~AlphaDither_Mask ) | ThresholdAlphaDither;
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} else if ( item == fa ) {
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conversion_flags = ( conversion_flags & ~AlphaDither_Mask ) | DiffuseAlphaDither;
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} else if ( item == ba ) {
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conversion_flags = ( conversion_flags & ~AlphaDither_Mask ) | OrderedAlphaDither;
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} else if ( item == ad ) {
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conversion_flags = ( conversion_flags & ~DitherMode_Mask ) | PreferDither;
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} else if ( item == dd ) {
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conversion_flags = ( conversion_flags & ~DitherMode_Mask ) | AvoidDither;
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}
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if ( ocf != conversion_flags ) {
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setMenuItemFlags();
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// And reconvert...
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reconvertImage();
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<a href="ntqwidget.html#repaint">repaint</a>(image.hasAlphaBuffer()); // show image in widget
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}
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}
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/*
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Set the options menu to reflect the conversion_flags value.
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*/
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void <a name="f407"></a>ImageViewer::setMenuItemFlags()
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{
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// File
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bool valid_image = pm.size() != TQSize( 0, 0 );
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file-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( si, valid_image );
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file-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( sp, valid_image );
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// Edit
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edit-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( t1, image.depth() != 1 );
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edit-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( t8, image.depth() != 8 );
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edit-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( t32, image.depth() != 32 );
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// Options
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bool may_need_color_dithering =
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!valid_image
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|| image.depth() == 32 && TQPixmap::<a href="ntqpixmap.html#defaultDepth">defaultDepth</a>() < 24;
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bool may_need_dithering = may_need_color_dithering
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|| image.depth() > 1 && options-><a href="ntqmenudata.html#isItemChecked">isItemChecked</a>(mo)
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|| image.depth() > 1 && TQPixmap::<a href="ntqpixmap.html#defaultDepth">defaultDepth</a>() == 1;
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bool has_alpha_mask = !valid_image || image.hasAlphaBuffer();
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options-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( fd, may_need_dithering );
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options-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( bd, may_need_dithering );
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options-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( td, may_need_dithering );
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options-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( ta, has_alpha_mask );
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options-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( fa, has_alpha_mask );
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options-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( ba, has_alpha_mask );
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options-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( ad, may_need_color_dithering );
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options-><a href="ntqmenudata.html#setItemEnabled">setItemEnabled</a>( dd, may_need_color_dithering );
|
|
|
|
options-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>( ac, (conversion_flags & ColorMode_Mask) == AutoColor );
|
|
options-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>( co, (conversion_flags & ColorMode_Mask) == ColorOnly );
|
|
options-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>( mo, (conversion_flags & ColorMode_Mask) == MonoOnly );
|
|
options-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>( fd, (conversion_flags & Dither_Mask) == DiffuseDither );
|
|
options-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>( bd, (conversion_flags & Dither_Mask) == OrderedDither );
|
|
options-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>( td, (conversion_flags & Dither_Mask) == ThresholdDither );
|
|
options-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>( ta, (conversion_flags & AlphaDither_Mask) == ThresholdAlphaDither );
|
|
options-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>( fa, (conversion_flags & AlphaDither_Mask) == DiffuseAlphaDither );
|
|
options-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>( ba, (conversion_flags & AlphaDither_Mask) == OrderedAlphaDither );
|
|
options-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>( ad, (conversion_flags & DitherMode_Mask) == PreferDither );
|
|
options-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>( dd, (conversion_flags & DitherMode_Mask) == AvoidDither );
|
|
}
|
|
|
|
void <a name="f408"></a>ImageViewer::updateStatus()
|
|
{
|
|
if ( pm.size() == TQSize( 0, 0 ) ) {
|
|
if ( !filename.isEmpty() )
|
|
status-><a href="ntqlabel.html#setText">setText</a>("Could not load image");
|
|
else
|
|
status-><a href="ntqlabel.html#setText">setText</a>("No image - select Open from File menu.");
|
|
} else {
|
|
<a href="ntqstring.html">TQString</a> message, moremsg;
|
|
message.<a href="ntqstring.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="ntqlabel.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-><a href="ntqmenudata.html#text">text</a>(item);
|
|
<a name="x1319"></a> <a href="ntqstring.html">TQString</a> savefilename = TQFileDialog::<a href="ntqfiledialog.html#getSaveFileName">getSaveFileName</a>(TQString::null, <a href="ntqstring.html#TQString-null">TQString::null</a>,
|
|
this, filename);
|
|
if ( !savefilename.<a href="ntqstring.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-><a href="ntqmenudata.html#text">text</a>(item);
|
|
<a href="ntqstring.html">TQString</a> savefilename = TQFileDialog::<a href="ntqfiledialog.html#getSaveFileName">getSaveFileName</a>(TQString::null,
|
|
TQString::null, this, filename);
|
|
if ( !savefilename.<a href="ntqstring.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->options-><a href="ntqmenudata.html#setItemChecked">setItemChecked</a>( that->cc, useColorContext() );
|
|
that-><a href="ntqwidget.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="ntqstring.html">TQString</a> newfilename = TQFileDialog::<a href="ntqfiledialog.html#getOpenFileName">getOpenFileName</a>( TQString::null,
|
|
TQString::null,
|
|
this );
|
|
if ( !newfilename.<a href="ntqstring.html#isEmpty">isEmpty</a>() ) {
|
|
loadImage( newfilename ) ;
|
|
<a href="ntqwidget.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="ntqstring.html">TQString</a>& 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="ntqwidget.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="x1347"></a><a name="x1325"></a> h += menubar-><a href="ntqmenubar.html#heightForWidth">heightForWidth</a>(w) + status-><a href="ntqwidget.html#height">height</a>();
|
|
<a href="ntqwidget.html#resize">resize</a>( w, h ); // we resize to fit image
|
|
} else {
|
|
pm.resize(0,0); // couldn't load image
|
|
<a href="ntqwidget.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="ntqcolor.html#destroyAllocContext">destroyAllocContext</a>( alloc_context );
|
|
alloc_context = 0;
|
|
}
|
|
if ( useColorContext() ) {
|
|
<a name="x1314"></a> alloc_context = TQColor::<a href="ntqcolor.html#enterAllocContext">enterAllocContext</a>();
|
|
// Clear the image to hide flickering palette
|
|
<a href="ntqpainter.html">TQPainter</a> painter(this);
|
|
<a name="x1338"></a> painter.<a href="ntqpainter.html#eraseRect">eraseRect</a>(0, menubar-><a href="ntqmenubar.html#heightForWidth">heightForWidth</a>( <a href="ntqwidget.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="ntqwidget.html#resize">resize</a>( <a href="ntqwidget.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="ntqcolor.html#leaveAllocContext">leaveAllocContext</a>();
|
|
|
|
return success; // TRUE if loaded OK
|
|
}
|
|
|
|
bool <a name="f415"></a>ImageViewer::smooth() const
|
|
{
|
|
return options-><a href="ntqmenudata.html#isItemChecked">isItemChecked</a>(ss);
|
|
}
|
|
|
|
bool <a name="f416"></a>ImageViewer::useColorContext() const
|
|
{
|
|
return options-><a href="ntqmenudata.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="ntqwidget.html#height">height</a>() - menubar-><a href="ntqmenubar.html#heightForWidth">heightForWidth</a>( <a href="ntqwidget.html#width">width</a>() ) - status-><a href="ntqwidget.html#height">height</a>();
|
|
|
|
if ( image.isNull() ) return;
|
|
|
|
TQApplication::<a href="ntqapplication.html#setOverrideCursor">setOverrideCursor</a>( waitCursor ); // this might take time
|
|
if ( <a href="ntqwidget.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="ntqwidget.html#width">width</a>(), h),
|
|
conversion_flags);
|
|
} else {
|
|
<a href="ntqwmatrix.html">TQWMatrix</a> m; // <a href="ntqwmatrix.html#TransformationMode">transformation matrix</a>
|
|
<a name="x1357"></a> m.<a href="ntqwmatrix.html#scale">scale</a>(((double)<a href="ntqwidget.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="ntqwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">TQResizeEvent</a> * )
|
|
{
|
|
<a name="x1355"></a> status-><a href="ntqwidget.html#setGeometry">setGeometry</a>(0, height() - status-><a href="ntqwidget.html#height">height</a>(),
|
|
<a href="ntqwidget.html#width">width</a>(), status-><a href="ntqwidget.html#height">height</a>());
|
|
|
|
if ( pm.size() == TQSize( 0, 0 ) ) // we couldn't load the image
|
|
return;
|
|
|
|
int h = <a href="ntqwidget.html#height">height</a>() - menubar-><a href="ntqmenubar.html#heightForWidth">heightForWidth</a>( <a href="ntqwidget.html#width">width</a>() ) - status-><a href="ntqwidget.html#height">height</a>();
|
|
if ( <a href="ntqwidget.html#width">width</a>() != pmScaled.width() || h != pmScaled.height())
|
|
{ // if new size,
|
|
scale(); // scale pmScaled to window
|
|
updateStatus();
|
|
}
|
|
if ( image.hasAlphaBuffer() )
|
|
<a href="ntqwidget.html#erase">erase</a>();
|
|
}
|
|
|
|
bool <a name="f418"></a>ImageViewer::convertEvent( <a href="qmouseevent.html">TQMouseEvent</a>* e, int& x, int& y)
|
|
{
|
|
if ( pm.size() != TQSize( 0, 0 ) ) {
|
|
int h = <a href="ntqwidget.html#height">height</a>() - menubar-><a href="ntqmenubar.html#heightForWidth">heightForWidth</a>( <a href="ntqwidget.html#width">width</a>() ) - status-><a href="ntqwidget.html#height">height</a>();
|
|
<a name="x1335"></a> int nx = e-><a href="qmouseevent.html#x">x</a>() * image.width() / width();
|
|
<a name="x1336"></a> int ny = (e-><a href="qmouseevent.html#y">y</a>()-menubar-><a href="ntqmenubar.html#heightForWidth">heightForWidth</a>( <a href="ntqwidget.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="ntqwidget.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="ntqwidget.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="ntqwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> *e )
|
|
{
|
|
if (convertEvent(e,pickx,picky)) {
|
|
updateStatus();
|
|
<a name="x1334"></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="ntqwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">TQPaintEvent</a> *e )
|
|
{
|
|
if ( pm.size() != TQSize( 0, 0 ) ) { // is an image loaded?
|
|
<a href="ntqpainter.html">TQPainter</a> painter(this);
|
|
<a name="x1340"></a><a name="x1339"></a> painter.<a href="ntqpainter.html#setClipRect">setClipRect</a>(e-><a href="qpaintevent.html#rect">rect</a>());
|
|
<a name="x1337"></a> painter.<a href="ntqpainter.html#drawPixmap">drawPixmap</a>(0, menubar-><a href="ntqmenubar.html#heightForWidth">heightForWidth</a>( <a href="ntqwidget.html#width">width</a>() ), pmScaled);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
Explain anything that might be confusing.
|
|
*/
|
|
void <a name="f419"></a>ImageViewer::giveHelp()
|
|
{
|
|
if (!helpmsg) {
|
|
<a href="ntqstring.html">TQString</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="x1321"></a> helptext += TQImage::<a href="ntqimage.html#inputFormatList">inputFormatList</a>().join(", ");
|
|
helptext += "</blockquote>";
|
|
|
|
helpmsg = new <a href="ntqmessagebox.html">TQMessageBox</a>( "Help", helptext,
|
|
TQMessageBox::Information, TQMessageBox::Ok, 0, 0, 0, 0, FALSE );
|
|
}
|
|
<a name="x1317"></a> helpmsg-><a href="ntqdialog.html#show">show</a>();
|
|
<a name="x1352"></a> helpmsg-><a href="ntqwidget.html#raise">raise</a>();
|
|
}
|
|
|
|
void <a name="f420"></a>ImageViewer::copyFrom(ImageViewer* s)
|
|
{
|
|
if ( clickx >= 0 ) {
|
|
int dx = clickx;
|
|
int dy = clicky;
|
|
int sx = s->clickx;
|
|
int sy = s->clicky;
|
|
int sw = TQABS(clickx - pickx)+1;
|
|
int sh = TQABS(clicky - picky)+1;
|
|
if ( clickx > pickx ) {
|
|
dx = pickx;
|
|
sx -= sw-1;
|
|
}
|
|
if ( clicky > picky ) {
|
|
dy = picky;
|
|
sy -= sh-1;
|
|
}
|
|
<a href="ntqimage.html#bitBlt">bitBlt</a>( &image, dx, dy, &s->image, sx, sy, sw, sh );
|
|
reconvertImage();
|
|
<a href="ntqwidget.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>()->setImage(image); // Less information loss
|
|
#endif
|
|
}
|
|
|
|
void <a name="f425"></a>ImageViewer::paste()
|
|
{
|
|
#ifndef TQT_NO_MIMECLIPBOARD
|
|
<a href="ntqimage.html">TQImage</a> p = TQApplication::<a href="ntqapplication.html#clipboard">clipboard</a>()->image();
|
|
<a name="x1322"></a> if ( !p.<a href="ntqimage.html#isNull">isNull</a>() ) {
|
|
filename = "pasted";
|
|
setImage(p);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void <a name="f426"></a>ImageViewer::setImage(const <a href="ntqimage.html">TQImage</a>& newimage)
|
|
{
|
|
image = newimage;
|
|
|
|
pickx = -1;
|
|
clickx = -1;
|
|
<a href="ntqwidget.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="ntqmenubar.html#heightForWidth">heightForWidth</a>(w) + status-><a href="ntqwidget.html#height">height</a>();
|
|
<a href="ntqwidget.html#resize">resize</a>( w, h ); // we resize to fit image
|
|
|
|
reconvertImage();
|
|
<a href="ntqwidget.html#repaint">repaint</a>( image.hasAlphaBuffer() );
|
|
|
|
updateStatus();
|
|
setMenuItemFlags();
|
|
}
|
|
|
|
void <a name="f427"></a>ImageViewer::editText()
|
|
{
|
|
ImageTextEditor editor(image,this);
|
|
editor.<a href="ntqdialog.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="ntqwidget.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 <<a href="qapplication-h.html">ntqapplication.h</a>>
|
|
#include <<a href="qimage-h.html">ntqimage.h</a>>
|
|
|
|
int main( int argc, char **argv )
|
|
{
|
|
if ( argc > 1 && TQString(argv[1]) == "-m" ) {
|
|
<a name="x1361"></a> TQApplication::<a href="ntqapplication.html#setColorSpec">setColorSpec</a>( TQApplication::ManyColor );
|
|
argc--;
|
|
argv++;
|
|
}
|
|
else if ( argc > 1 && 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="ntqfiledialog.html#setIconProvider">setIconProvider</a>( &iip );
|
|
|
|
if ( argc <= 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-><a href="ntqwidget.html#setCaption">setCaption</a>("TQt Example - Image Viewer");
|
|
w-><a href="ntqwidget.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], TQt::WDestructiveClose | TQt::WResizeNoErase );
|
|
w-><a href="ntqwidget.html#setCaption">setCaption</a>("TQt Example - Image Viewer");
|
|
w->loadImage( argv[i] );
|
|
w-><a href="ntqwidget.html#show">show</a>();
|
|
}
|
|
}
|
|
|
|
TQObject::<a href="ntqobject.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 © 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>
|
|
</html>
|