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447 lines
20 KiB
447 lines
20 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/qmag/qmag.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>TQMag</title>
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<style type="text/css"><!--
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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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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</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>TQMag</h1>
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<p>
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This is a simple magnifier-type program. It shows how one can do
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some quite low-level operations in a portable way using TQt.
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<p> Run it, click in the magnifier window, then click where you want to
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magnify or drag out a rectangle. Two combo boxes let you select
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amplification and refresh frequency, a text label tells you the color
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of the pixel the cursor is on, and a button lets you save the
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magnified area as a .bmp file.
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<p> <hr>
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<p> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/qmag.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 <<a href="qcombobox-h.html">ntqcombobox.h</a>>
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#include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>>
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#include <<a href="qpixmap-h.html">ntqpixmap.h</a>>
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#include <<a href="tqimage-h.html">tqimage.h</a>>
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#include <<a href="qlabel-h.html">ntqlabel.h</a>>
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#include <<a href="tqfiledialog-h.html">tqfiledialog.h</a>>
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#include <<a href="tqregexp-h.html">tqregexp.h</a>>
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#include <<a href="qapplication-h.html">ntqapplication.h</a>>
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#include <<a href="tqpainter-h.html">tqpainter.h</a>>
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#include <<a href="qwmatrix-h.html">ntqwmatrix.h</a>>
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class MagWidget : public <a href="tqwidget.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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MagWidget( <a href="tqwidget.html">TQWidget</a> *parent=0, const char *name=0 );
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public slots:
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void setZoom( int );
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void setRefresh( int );
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void save();
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void multiSave();
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protected:
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void paintEvent( <a href="tqpaintevent.html">TQPaintEvent</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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void focusOutEvent( <a href="qfocusevent.html">TQFocusEvent</a> * );
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void timerEvent( <a href="tqtimerevent.html">TQTimerEvent</a> * );
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void resizeEvent( <a href="qresizeevent.html">TQResizeEvent</a> * );
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private:
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void grabAround(TQPoint pos);
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void grab();
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<a href="ntqcombobox.html">TQComboBox</a> *zoom;
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<a href="ntqcombobox.html">TQComboBox</a> *refresh;
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<a href="ntqpushbutton.html">TQPushButton</a> *saveButton;
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<a href="ntqpushbutton.html">TQPushButton</a> *multiSaveButton;
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<a href="ntqpushbutton.html">TQPushButton</a> *quitButton;
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<a href="ntqpixmap.html">TQPixmap</a> pm; // pixmap, magnified
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<a href="ntqpixmap.html">TQPixmap</a> p; // pixmap
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<a href="tqimage.html">TQImage</a> image; // image of pixmap (for RGB)
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<a href="ntqlabel.html">TQLabel</a> *rgb;
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int yoffset; // pixels in addition to the actual picture
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int z; // magnification factor
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int r; // autorefresh rate (index into refreshrates)
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bool grabbing; // TRUE if qmag is currently grabbing
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int grabx, graby;
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<a href="tqstring.html">TQString</a> multifn; // filename for multisave
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};
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#ifdef COMPLEX_GUI
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static const char *zoomfactors[] = {
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"100%", "200%", "300%", "400%", "500%",
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"600%", "700%", "800%", "1600%", 0 };
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static const char *refreshrates[] = {
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"No autorefresh", "50 per second", "4 per second", "3 per second", "2 per second",
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"Every second", "Every two seconds", "Every three seconds",
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"Every five seconds", "Every ten seconds", 0 };
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#endif
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static const int timer[] = {
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0, 20, 250, 333, 500, 1000, 2000, 3000, 5000, 10000 };
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<a name="f484"></a>MagWidget::MagWidget( <a href="tqwidget.html">TQWidget</a> *parent, const char *name )
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: <a href="tqwidget.html">TQWidget</a>( parent, name)
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{
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z = 1; // default zoom (100%)
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r = 0; // default refresh (none)
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#ifdef COMPLEX_GUI
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int w=0, x=0, n;
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zoom = new <a href="ntqcombobox.html">TQComboBox</a>( FALSE, this );
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<a href="ntqapplication.html#TQ_CHECK_PTR">TQ_CHECK_PTR</a>(zoom);
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<a name="x1773"></a> zoom-><a href="ntqcombobox.html#insertStrList">insertStrList</a>( zoomfactors, 9 );
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<a name="x1772"></a> <a href="tqobject.html#connect">connect</a>( zoom, TQ_SIGNAL(<a href="ntqcombobox.html#activated">activated</a>(int)), TQ_SLOT(setZoom(int)) );
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refresh = new <a href="ntqcombobox.html">TQComboBox</a>( FALSE, this );
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<a href="ntqapplication.html#TQ_CHECK_PTR">TQ_CHECK_PTR</a>(refresh);
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refresh-><a href="ntqcombobox.html#insertStrList">insertStrList</a>( refreshrates, 9 );
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<a href="tqobject.html#connect">connect</a>( refresh, TQ_SIGNAL(<a href="ntqcombobox.html#activated">activated</a>(int)), TQ_SLOT(setRefresh(int)) );
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for( n=0; n<9; n++) {
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<a name="x1797"></a> int w2 = zoom-><a href="tqwidget.html#fontMetrics">fontMetrics</a>().width( zoomfactors[n] );
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w = TQMAX(w2, w);
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}
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<a name="x1807"></a> zoom-><a href="tqwidget.html#setGeometry">setGeometry</a>( 2, 2, w+30, 20 );
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x = w+34;
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w = 0;
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for( n=0; n<9; n++) {
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int w2 = refresh-><a href="tqwidget.html#fontMetrics">fontMetrics</a>().width( refreshrates[n] );
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w = TQMAX(w2, w);
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}
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refresh-><a href="tqwidget.html#setGeometry">setGeometry</a>( x, 2, w+30, 20 );
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saveButton = new <a href="ntqpushbutton.html">TQPushButton</a>( this );
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<a href="ntqapplication.html#TQ_CHECK_PTR">TQ_CHECK_PTR</a>(saveButton);
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<a href="tqobject.html#connect">connect</a>( saveButton, TQ_SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, TQ_SLOT(save()) );
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<a name="x1771"></a> saveButton-><a href="ntqbutton.html#setText">setText</a>( "Save" );
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<a name="x1788"></a> saveButton-><a href="tqwidget.html#setGeometry">setGeometry</a>( x+w+30+2, 2,
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10+saveButton-><a href="tqwidget.html#fontMetrics">fontMetrics</a>().width("Save"), 20 );
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multiSaveButton = new <a href="ntqpushbutton.html">TQPushButton</a>( this );
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<a name="x1790"></a> multiSaveButton-><a href="ntqpushbutton.html#setToggleButton">setToggleButton</a>(TRUE);
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<a href="ntqapplication.html#TQ_CHECK_PTR">TQ_CHECK_PTR</a>(multiSaveButton);
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<a href="tqobject.html#connect">connect</a>( multiSaveButton, TQ_SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, TQ_SLOT(multiSave()) );
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multiSaveButton-><a href="ntqbutton.html#setText">setText</a>( "MultiSave" );
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<a name="x1798"></a> multiSaveButton-><a href="tqwidget.html#setGeometry">setGeometry</a>( saveButton-><a href="tqwidget.html#geometry">geometry</a>().right() + 2, 2,
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10+multiSaveButton-><a href="tqwidget.html#fontMetrics">fontMetrics</a>().width("MultiSave"), 20 );
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quitButton = new <a href="ntqpushbutton.html">TQPushButton</a>( this );
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<a href="ntqapplication.html#TQ_CHECK_PTR">TQ_CHECK_PTR</a>(quitButton);
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<a href="tqobject.html#connect">connect</a>( quitButton, TQ_SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), tqApp, TQ_SLOT(<a href="ntqapplication.html#quit">quit</a>()) );
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quitButton-><a href="ntqbutton.html#setText">setText</a>( "Quit" );
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quitButton-><a href="tqwidget.html#setGeometry">setGeometry</a>( multiSaveButton-><a href="tqwidget.html#geometry">geometry</a>().right() + 2, 2,
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10+quitButton-><a href="tqwidget.html#fontMetrics">fontMetrics</a>().width("Quit"), 20 );
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#else
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zoom = 0;
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multiSaveButton = 0;
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#endif
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setRefresh(1);
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setZoom(5);
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rgb = new <a href="ntqlabel.html">TQLabel</a>( this );
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<a href="ntqapplication.html#TQ_CHECK_PTR">TQ_CHECK_PTR</a>( rgb );
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<a name="x1779"></a> rgb-><a href="ntqlabel.html#setText">setText</a>( "" );
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rgb-><a href="ntqlabel.html#setAlignment">setAlignment</a>( AlignVCenter );
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rgb-><a href="tqwidget.html#resize">resize</a>( <a href="tqwidget.html#width">width</a>(), rgb-><a href="tqwidget.html#fontMetrics">fontMetrics</a>().height() + 4 );
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#ifdef COMPLEX_GUI
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<a name="x1799"></a> yoffset = zoom-><a href="tqwidget.html#height">height</a>() // top buttons
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+ 4 // space around top buttons
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+ rgb-><a href="tqwidget.html#height">height</a>(); // color-value text height
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<a name="x1804"></a> <a href="tqwidget.html#setMinimumSize">setMinimumSize</a>( quitButton-><a href="tqwidget.html#pos">pos</a>().x(), yoffset+20 );
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<a href="tqwidget.html#resize">resize</a>( quitButton-><a href="tqwidget.html#geometry">geometry</a>().topRight().x() + 2, yoffset+60 );
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#else
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yoffset = 0;
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<a href="tqwidget.html#resize">resize</a>(350,350);
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#endif
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grabx = graby = -1;
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grabbing = FALSE;
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<a href="tqwidget.html#setMouseTracking">setMouseTracking</a>( TRUE ); // and do let me know what pixel I'm at, eh?
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<a name="x1765"></a> grabAround( TQPoint(grabx=tqApp-><a href="ntqapplication.html#desktop">desktop</a>()->width()/2, graby=tqApp-><a href="ntqapplication.html#desktop">desktop</a>()->height()/2) );
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}
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void <a name="f485"></a>MagWidget::setZoom( int index )
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{
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if (index == 8)
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z = 16;
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else
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z = index+1;
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grab();
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}
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void <a name="f486"></a>MagWidget::setRefresh( int index )
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{
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r = index;
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<a href="tqobject.html#killTimers">killTimers</a>();
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if (index && !grabbing)
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<a href="tqobject.html#startTimer">startTimer</a>( timer[r] );
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}
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void <a name="f487"></a>MagWidget::save()
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{
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<a name="x1785"></a> if ( !p.<a href="ntqpixmap.html#isNull">isNull</a>() ) {
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<a href="tqobject.html#killTimers">killTimers</a>();
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<a name="x1775"></a> <a href="tqstring.html">TQString</a> fn = TQFileDialog::<a href="tqfiledialog.html#getSaveFileName">getSaveFileName</a>();
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<a name="x1792"></a> if ( !fn.<a href="tqstring.html#isEmpty">isEmpty</a>() )
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<a name="x1786"></a> p.<a href="ntqpixmap.html#save">save</a>( fn, "BMP" );
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if ( r )
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<a href="tqobject.html#startTimer">startTimer</a>( timer[r] );
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}
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}
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void <a name="f488"></a>MagWidget::multiSave()
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{
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if ( !p.<a href="ntqpixmap.html#isNull">isNull</a>() ) {
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multifn = ""; // stops saving
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multifn = TQFileDialog::<a href="tqfiledialog.html#getSaveFileName">getSaveFileName</a>();
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if ( multifn.<a href="tqstring.html#isEmpty">isEmpty</a>() )
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<a name="x1789"></a> multiSaveButton-><a href="ntqpushbutton.html#setOn">setOn</a>(FALSE);
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if ( !r )
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p.<a href="ntqpixmap.html#save">save</a>( multifn, "BMP" );
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} else {
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multiSaveButton-><a href="ntqpushbutton.html#setOn">setOn</a>(FALSE);
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}
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}
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void <a name="f489"></a>MagWidget::grab()
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{
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if ( !isVisible() )
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return; // don't eat resources when iconified
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if ( grabx < 0 || graby < 0 )
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return; // don't grab until the user has said to
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int x,y, w,h;
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w = (<a href="tqwidget.html#width">width</a>()+z-1)/z;
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h = (<a href="tqwidget.html#height">height</a>()+z-1-yoffset)/z;
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if ( w<1 || h<1 )
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return; // don't ask too much from the window system :)
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x = grabx-w/2; // find a suitable position to grab from
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y = graby-h/2;
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if ( x + w > TQApplication::<a href="ntqapplication.html#desktop">desktop</a>()->width() )
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x = TQApplication::<a href="ntqapplication.html#desktop">desktop</a>()->width()-w;
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else if ( x < 0 )
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x = 0;
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if ( y + h > TQApplication::<a href="ntqapplication.html#desktop">desktop</a>()->height() )
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y = TQApplication::<a href="ntqapplication.html#desktop">desktop</a>()->height()-h;
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else if ( y < 0 )
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y = 0;
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<a name="x1784"></a> p = TQPixmap::<a href="ntqpixmap.html#grabWindow">grabWindow</a>( TQApplication::<a href="ntqapplication.html#desktop">desktop</a>()->winId(), x, y, w, h );
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<a name="x1783"></a> image = p.<a href="ntqpixmap.html#convertToImage">convertToImage</a>();
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<a href="ntqwmatrix.html">TQWMatrix</a> m; // after getting it, scale it
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<a name="x1809"></a> m.<a href="ntqwmatrix.html#scale">scale</a>( (double)z, (double)z );
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<a name="x1787"></a> pm = p.<a href="ntqpixmap.html#xForm">xForm</a>( m );
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<a name="x1770"></a> if ( !multiSaveButton || !multiSaveButton-><a href="ntqbutton.html#isOn">isOn</a>() )
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<a href="tqwidget.html#repaint">repaint</a>( FALSE ); // and finally repaint, flicker-free
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}
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<a name="x1803"></a>void MagWidget::<a href="tqwidget.html#paintEvent">paintEvent</a>( <a href="tqpaintevent.html">TQPaintEvent</a> * )
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{
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if ( !pm.<a href="ntqpixmap.html#isNull">isNull</a>() ) {
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<a href="tqpainter.html">TQPainter</a> paint( this );
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<a name="x1782"></a> paint.<a href="tqpainter.html#drawPixmap">drawPixmap</a>( 0, zoom ? zoom-><a href="tqwidget.html#height">height</a>()+4 : 0, pm,
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0,0, width(), height()-yoffset );
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}
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}
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<a name="x1801"></a>void MagWidget::<a href="tqwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> *e )
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{
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if ( !grabbing ) { // prepare to grab...
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grabbing = TRUE;
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<a href="tqobject.html#killTimers">killTimers</a>();
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<a href="tqwidget.html#grabMouse">grabMouse</a>( crossCursor );
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grabx = -1;
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graby = -1;
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} else { // REALLY prepare to grab
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<a name="x1780"></a> grabx = <a href="tqwidget.html#mapToGlobal">mapToGlobal</a>(e-><a href="qmouseevent.html#pos">pos</a>()).x();
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graby = <a href="tqwidget.html#mapToGlobal">mapToGlobal</a>(e-><a href="qmouseevent.html#pos">pos</a>()).y();
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}
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}
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<a name="x1802"></a>void MagWidget::<a href="tqwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> * e )
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{
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if ( grabbing && grabx >= 0 && graby >= 0 ) {
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grabbing = FALSE;
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grabAround(e-><a href="qmouseevent.html#pos">pos</a>());
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<a href="tqwidget.html#releaseMouse">releaseMouse</a>();
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}
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}
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void <a name="f490"></a>MagWidget::grabAround(TQPoint pos)
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{
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int rx, ry;
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rx = <a href="tqwidget.html#mapToGlobal">mapToGlobal</a>(pos).x();
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ry = <a href="tqwidget.html#mapToGlobal">mapToGlobal</a>(pos).y();
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int w = TQABS(rx-grabx);
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int h = TQABS(ry-graby);
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if ( w > 10 && h > 10 ) {
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int pz;
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pz = 1;
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while ( w*pz*h*pz < width()*(<a href="tqwidget.html#height">height</a>()-yoffset) &&
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w*pz < TQApplication::<a href="ntqapplication.html#desktop">desktop</a>()->width() &&
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h*pz < TQApplication::<a href="ntqapplication.html#desktop">desktop</a>()->height() )
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pz++;
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if ( (w*pz*h*pz - width()*(<a href="tqwidget.html#height">height</a>()-yoffset)) >
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(<a href="tqwidget.html#width">width</a>()*(<a href="tqwidget.html#height">height</a>()-yoffset) - w*(pz-1)*h*(pz-1)) )
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pz--;
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if ( pz < 1 )
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pz = 1;
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if ( pz > 8 )
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pz = 8;
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if ( zoom )
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<a name="x1774"></a> zoom-><a href="ntqcombobox.html#setCurrentItem">setCurrentItem</a>( pz-1 );
|
|
|
|
z = pz;
|
|
grabx = TQMIN(rx, grabx) + w/2;
|
|
graby = TQMIN(ry, graby) + h/2;
|
|
<a href="tqwidget.html#resize">resize</a>( w*z, h*z+yoffset );
|
|
}
|
|
grab();
|
|
if ( r )
|
|
<a href="tqobject.html#startTimer">startTimer</a>( timer[r] );
|
|
}
|
|
|
|
|
|
<a name="x1800"></a>void MagWidget::<a href="tqwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> *e )
|
|
{
|
|
if ( grabbing || pm.<a href="ntqpixmap.html#isNull">isNull</a>() ||
|
|
e-><a href="qmouseevent.html#pos">pos</a>().y() > height() - (zoom ? zoom-><a href="tqwidget.html#fontMetrics">fontMetrics</a>().height() - 4 : 0) ||
|
|
e-><a href="qmouseevent.html#pos">pos</a>().y() < (zoom ? zoom-><a href="tqwidget.html#height">height</a>()+4 : 4) ) {
|
|
rgb-><a href="ntqlabel.html#setText">setText</a>( "" );
|
|
} else {
|
|
int x,y;
|
|
x = e-><a href="qmouseevent.html#pos">pos</a>().x() / z;
|
|
y = (e-><a href="qmouseevent.html#pos">pos</a>().y() - ( zoom ? zoom-><a href="tqwidget.html#height">height</a>() : 0 ) - 4) / z;
|
|
<a href="tqstring.html">TQString</a> pixelinfo;
|
|
<a name="x1777"></a> if ( image.<a href="tqimage.html#valid">valid</a>(x,y) )
|
|
{
|
|
<a name="x1776"></a> TQRgb px = image.<a href="tqimage.html#pixel">pixel</a>(x,y);
|
|
<a name="x1795"></a> pixelinfo.<a href="tqstring.html#sprintf">sprintf</a>(" %3d,%3d,%3d #%02x%02x%02x",
|
|
<a href="tqcolor.html#qRed">tqRed</a>(px), tqGreen(px), tqBlue(px),
|
|
<a href="tqcolor.html#qRed">tqRed</a>(px), tqGreen(px), tqBlue(px));
|
|
}
|
|
<a href="tqstring.html">TQString</a> label;
|
|
label.<a href="tqstring.html#sprintf">sprintf</a>( "x=%d, y=%d %s",
|
|
x+grabx, y+graby, (const char*)pixelinfo );
|
|
rgb-><a href="ntqlabel.html#setText">setText</a>( label );
|
|
}
|
|
}
|
|
|
|
|
|
<a name="x1796"></a>void MagWidget::<a href="tqwidget.html#focusOutEvent">focusOutEvent</a>( <a href="qfocusevent.html">TQFocusEvent</a> * )
|
|
{
|
|
rgb-><a href="ntqlabel.html#setText">setText</a>( "" );
|
|
}
|
|
|
|
|
|
<a name="x1781"></a>void MagWidget::<a href="tqobject.html#timerEvent">timerEvent</a>( <a href="tqtimerevent.html">TQTimerEvent</a> * )
|
|
{
|
|
grab();
|
|
/*
|
|
if ( multiSaveButton-><a href="ntqbutton.html#isOn">isOn</a>() && !multifn.<a href="tqstring.html#isEmpty">isEmpty</a>() ) {
|
|
<a href="tqregexp.html">TQRegExp</a> num("[0-9][0-9]*");
|
|
int start;
|
|
int len;
|
|
<a name="x1791"></a> if ((start=num.<a href="tqregexp.html#match">match</a>(multifn,0,&len))>=0)
|
|
<a name="x1794"></a> multifn.<a href="tqstring.html#replace">replace</a>(num,
|
|
<a name="x1793"></a> TQString().setNum(multifn.<a href="tqstring.html#mid">mid</a>(start,len).toInt()+1)
|
|
);
|
|
p.<a href="ntqpixmap.html#save">save</a>( multifn, "BMP" );
|
|
}
|
|
*/
|
|
}
|
|
|
|
|
|
<a name="x1806"></a>void MagWidget::<a href="tqwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">TQResizeEvent</a> * )
|
|
{
|
|
rgb-><a href="tqwidget.html#setGeometry">setGeometry</a>( 0, height() - rgb-><a href="tqwidget.html#height">height</a>(), width(), rgb-><a href="tqwidget.html#height">height</a>() );
|
|
grab();
|
|
}
|
|
|
|
|
|
#include "qmag.moc"
|
|
|
|
|
|
int main( int argc, char **argv )
|
|
{
|
|
<a href="ntqapplication.html">TQApplication</a> a( argc, argv );
|
|
MagWidget m;
|
|
a.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &m );
|
|
m.<a href="tqwidget.html#show">show</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>
|