<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/qmag/qmag.doc:4 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>TQMag</title> <style type="text/css"><!-- fn { margin-left: 1cm; text-indent: -1cm; } a:link { color: #004faf; text-decoration: none } a:visited { color: #672967; text-decoration: none } body { background: #ffffff; color: black; } --></style> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr bgcolor="#E5E5E5"> <td valign=center> <a href="index.html"> <font color="#004faf">Home</font></a> | <a href="classes.html"> <font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"> <font color="#004faf">Main Classes</font></a> | <a href="annotated.html"> <font color="#004faf">Annotated</font></a> | <a href="groups.html"> <font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"> <font color="#004faf">Functions</font></a> </td> <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> <p> This is a simple magnifier-type program. It shows how one can do some quite low-level operations in a portable way using TQt. <p> Run it, click in the magnifier window, then click where you want to magnify or drag out a rectangle. Two combo boxes let you select amplification and refresh frequency, a text label tells you the color of the pixel the cursor is on, and a button lets you save the magnified area as a .bmp file. <p> <hr> <p> Implementation: <p> <pre>/**************************************************************************** ** $Id: qt/qmag.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 <<a href="qcombobox-h.html">ntqcombobox.h</a>> #include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>> #include <<a href="qpixmap-h.html">ntqpixmap.h</a>> #include <<a href="qimage-h.html">ntqimage.h</a>> #include <<a href="qlabel-h.html">ntqlabel.h</a>> #include <<a href="qfiledialog-h.html">ntqfiledialog.h</a>> #include <<a href="qregexp-h.html">ntqregexp.h</a>> #include <<a href="qapplication-h.html">ntqapplication.h</a>> #include <<a href="qpainter-h.html">ntqpainter.h</a>> #include <<a href="qwmatrix-h.html">ntqwmatrix.h</a>> class MagWidget : public <a href="ntqwidget.html">TQWidget</a> { <a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a> public: MagWidget( <a href="ntqwidget.html">TQWidget</a> *parent=0, const char *name=0 ); public slots: void setZoom( int ); void setRefresh( int ); void save(); void multiSave(); protected: void paintEvent( <a href="qpaintevent.html">TQPaintEvent</a> * ); void mousePressEvent( <a href="qmouseevent.html">TQMouseEvent</a> * ); void mouseReleaseEvent( <a href="qmouseevent.html">TQMouseEvent</a> * ); void mouseMoveEvent( <a href="qmouseevent.html">TQMouseEvent</a> * ); void focusOutEvent( <a href="qfocusevent.html">TQFocusEvent</a> * ); void timerEvent( <a href="qtimerevent.html">TQTimerEvent</a> * ); void resizeEvent( <a href="qresizeevent.html">TQResizeEvent</a> * ); private: void grabAround(TQPoint pos); void grab(); <a href="ntqcombobox.html">TQComboBox</a> *zoom; <a href="ntqcombobox.html">TQComboBox</a> *refresh; <a href="ntqpushbutton.html">TQPushButton</a> *saveButton; <a href="ntqpushbutton.html">TQPushButton</a> *multiSaveButton; <a href="ntqpushbutton.html">TQPushButton</a> *quitButton; <a href="ntqpixmap.html">TQPixmap</a> pm; // pixmap, magnified <a href="ntqpixmap.html">TQPixmap</a> p; // pixmap <a href="ntqimage.html">TQImage</a> image; // image of pixmap (for RGB) <a href="ntqlabel.html">TQLabel</a> *rgb; int yoffset; // pixels in addition to the actual picture int z; // magnification factor int r; // autorefresh rate (index into refreshrates) bool grabbing; // TRUE if qmag is currently grabbing int grabx, graby; <a href="ntqstring.html">TQString</a> multifn; // filename for multisave }; #ifdef COMPLEX_GUI static const char *zoomfactors[] = { "100%", "200%", "300%", "400%", "500%", "600%", "700%", "800%", "1600%", 0 }; static const char *refreshrates[] = { "No autorefresh", "50 per second", "4 per second", "3 per second", "2 per second", "Every second", "Every two seconds", "Every three seconds", "Every five seconds", "Every ten seconds", 0 }; #endif static const int timer[] = { 0, 20, 250, 333, 500, 1000, 2000, 3000, 5000, 10000 }; <a name="f484"></a>MagWidget::MagWidget( <a href="ntqwidget.html">TQWidget</a> *parent, const char *name ) : <a href="ntqwidget.html">TQWidget</a>( parent, name) { z = 1; // default zoom (100%) r = 0; // default refresh (none) #ifdef COMPLEX_GUI int w=0, x=0, n; zoom = new <a href="ntqcombobox.html">TQComboBox</a>( FALSE, this ); <a href="ntqapplication.html#TQ_CHECK_PTR">TQ_CHECK_PTR</a>(zoom); <a name="x1773"></a> zoom-><a href="ntqcombobox.html#insertStrList">insertStrList</a>( zoomfactors, 9 ); <a name="x1772"></a> <a href="ntqobject.html#connect">connect</a>( zoom, SIGNAL(<a href="ntqcombobox.html#activated">activated</a>(int)), SLOT(setZoom(int)) ); refresh = new <a href="ntqcombobox.html">TQComboBox</a>( FALSE, this ); <a href="ntqapplication.html#TQ_CHECK_PTR">TQ_CHECK_PTR</a>(refresh); refresh-><a href="ntqcombobox.html#insertStrList">insertStrList</a>( refreshrates, 9 ); <a href="ntqobject.html#connect">connect</a>( refresh, SIGNAL(<a href="ntqcombobox.html#activated">activated</a>(int)), SLOT(setRefresh(int)) ); for( n=0; n<9; n++) { <a name="x1797"></a> int w2 = zoom-><a href="ntqwidget.html#fontMetrics">fontMetrics</a>().width( zoomfactors[n] ); w = TQMAX(w2, w); } <a name="x1807"></a> zoom-><a href="ntqwidget.html#setGeometry">setGeometry</a>( 2, 2, w+30, 20 ); x = w+34; w = 0; for( n=0; n<9; n++) { int w2 = refresh-><a href="ntqwidget.html#fontMetrics">fontMetrics</a>().width( refreshrates[n] ); w = TQMAX(w2, w); } refresh-><a href="ntqwidget.html#setGeometry">setGeometry</a>( x, 2, w+30, 20 ); saveButton = new <a href="ntqpushbutton.html">TQPushButton</a>( this ); <a href="ntqapplication.html#TQ_CHECK_PTR">TQ_CHECK_PTR</a>(saveButton); <a href="ntqobject.html#connect">connect</a>( saveButton, SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, SLOT(save()) ); <a name="x1771"></a> saveButton-><a href="ntqbutton.html#setText">setText</a>( "Save" ); <a name="x1788"></a> saveButton-><a href="ntqwidget.html#setGeometry">setGeometry</a>( x+w+30+2, 2, 10+saveButton-><a href="ntqwidget.html#fontMetrics">fontMetrics</a>().width("Save"), 20 ); multiSaveButton = new <a href="ntqpushbutton.html">TQPushButton</a>( this ); <a name="x1790"></a> multiSaveButton-><a href="ntqpushbutton.html#setToggleButton">setToggleButton</a>(TRUE); <a href="ntqapplication.html#TQ_CHECK_PTR">TQ_CHECK_PTR</a>(multiSaveButton); <a href="ntqobject.html#connect">connect</a>( multiSaveButton, SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), this, SLOT(multiSave()) ); multiSaveButton-><a href="ntqbutton.html#setText">setText</a>( "MultiSave" ); <a name="x1798"></a> multiSaveButton-><a href="ntqwidget.html#setGeometry">setGeometry</a>( saveButton-><a href="ntqwidget.html#geometry">geometry</a>().right() + 2, 2, 10+multiSaveButton-><a href="ntqwidget.html#fontMetrics">fontMetrics</a>().width("MultiSave"), 20 ); quitButton = new <a href="ntqpushbutton.html">TQPushButton</a>( this ); <a href="ntqapplication.html#TQ_CHECK_PTR">TQ_CHECK_PTR</a>(quitButton); <a href="ntqobject.html#connect">connect</a>( quitButton, SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), tqApp, SLOT(<a href="ntqapplication.html#quit">quit</a>()) ); quitButton-><a href="ntqbutton.html#setText">setText</a>( "Quit" ); quitButton-><a href="ntqwidget.html#setGeometry">setGeometry</a>( multiSaveButton-><a href="ntqwidget.html#geometry">geometry</a>().right() + 2, 2, 10+quitButton-><a href="ntqwidget.html#fontMetrics">fontMetrics</a>().width("Quit"), 20 ); #else zoom = 0; multiSaveButton = 0; #endif setRefresh(1); setZoom(5); rgb = new <a href="ntqlabel.html">TQLabel</a>( this ); <a href="ntqapplication.html#TQ_CHECK_PTR">TQ_CHECK_PTR</a>( rgb ); <a name="x1779"></a> rgb-><a href="ntqlabel.html#setText">setText</a>( "" ); rgb-><a href="ntqlabel.html#setAlignment">setAlignment</a>( AlignVCenter ); rgb-><a href="ntqwidget.html#resize">resize</a>( <a href="ntqwidget.html#width">width</a>(), rgb-><a href="ntqwidget.html#fontMetrics">fontMetrics</a>().height() + 4 ); #ifdef COMPLEX_GUI <a name="x1799"></a> yoffset = zoom-><a href="ntqwidget.html#height">height</a>() // top buttons + 4 // space around top buttons + rgb-><a href="ntqwidget.html#height">height</a>(); // color-value text height <a name="x1804"></a> <a href="ntqwidget.html#setMinimumSize">setMinimumSize</a>( quitButton-><a href="ntqwidget.html#pos">pos</a>().x(), yoffset+20 ); <a href="ntqwidget.html#resize">resize</a>( quitButton-><a href="ntqwidget.html#geometry">geometry</a>().topRight().x() + 2, yoffset+60 ); #else yoffset = 0; <a href="ntqwidget.html#resize">resize</a>(350,350); #endif grabx = graby = -1; grabbing = FALSE; <a href="ntqwidget.html#setMouseTracking">setMouseTracking</a>( TRUE ); // and do let me know what pixel I'm at, eh? <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) ); } void <a name="f485"></a>MagWidget::setZoom( int index ) { if (index == 8) z = 16; else z = index+1; grab(); } void <a name="f486"></a>MagWidget::setRefresh( int index ) { r = index; <a href="ntqobject.html#killTimers">killTimers</a>(); if (index && !grabbing) <a href="ntqobject.html#startTimer">startTimer</a>( timer[r] ); } void <a name="f487"></a>MagWidget::save() { <a name="x1785"></a> if ( !p.<a href="ntqpixmap.html#isNull">isNull</a>() ) { <a href="ntqobject.html#killTimers">killTimers</a>(); <a name="x1775"></a> <a href="ntqstring.html">TQString</a> fn = TQFileDialog::<a href="ntqfiledialog.html#getSaveFileName">getSaveFileName</a>(); <a name="x1792"></a> if ( !fn.<a href="ntqstring.html#isEmpty">isEmpty</a>() ) <a name="x1786"></a> p.<a href="ntqpixmap.html#save">save</a>( fn, "BMP" ); if ( r ) <a href="ntqobject.html#startTimer">startTimer</a>( timer[r] ); } } void <a name="f488"></a>MagWidget::multiSave() { if ( !p.<a href="ntqpixmap.html#isNull">isNull</a>() ) { multifn = ""; // stops saving multifn = TQFileDialog::<a href="ntqfiledialog.html#getSaveFileName">getSaveFileName</a>(); if ( multifn.<a href="ntqstring.html#isEmpty">isEmpty</a>() ) <a name="x1789"></a> multiSaveButton-><a href="ntqpushbutton.html#setOn">setOn</a>(FALSE); if ( !r ) p.<a href="ntqpixmap.html#save">save</a>( multifn, "BMP" ); } else { multiSaveButton-><a href="ntqpushbutton.html#setOn">setOn</a>(FALSE); } } void <a name="f489"></a>MagWidget::grab() { if ( !isVisible() ) return; // don't eat resources when iconified if ( grabx < 0 || graby < 0 ) return; // don't grab until the user has said to int x,y, w,h; w = (<a href="ntqwidget.html#width">width</a>()+z-1)/z; h = (<a href="ntqwidget.html#height">height</a>()+z-1-yoffset)/z; if ( w<1 || h<1 ) return; // don't ask too much from the window system :) x = grabx-w/2; // find a suitable position to grab from y = graby-h/2; if ( x + w > TQApplication::<a href="ntqapplication.html#desktop">desktop</a>()->width() ) x = TQApplication::<a href="ntqapplication.html#desktop">desktop</a>()->width()-w; else if ( x < 0 ) x = 0; if ( y + h > TQApplication::<a href="ntqapplication.html#desktop">desktop</a>()->height() ) y = TQApplication::<a href="ntqapplication.html#desktop">desktop</a>()->height()-h; else if ( y < 0 ) y = 0; <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 ); <a name="x1783"></a> image = p.<a href="ntqpixmap.html#convertToImage">convertToImage</a>(); <a href="ntqwmatrix.html">TQWMatrix</a> m; // after getting it, scale it <a name="x1809"></a> m.<a href="ntqwmatrix.html#scale">scale</a>( (double)z, (double)z ); <a name="x1787"></a> pm = p.<a href="ntqpixmap.html#xForm">xForm</a>( m ); <a name="x1770"></a> if ( !multiSaveButton || !multiSaveButton-><a href="ntqbutton.html#isOn">isOn</a>() ) <a href="ntqwidget.html#repaint">repaint</a>( FALSE ); // and finally repaint, flicker-free } <a name="x1803"></a>void MagWidget::<a href="ntqwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">TQPaintEvent</a> * ) { if ( !pm.<a href="ntqpixmap.html#isNull">isNull</a>() ) { <a href="ntqpainter.html">TQPainter</a> paint( this ); <a name="x1782"></a> paint.<a href="ntqpainter.html#drawPixmap">drawPixmap</a>( 0, zoom ? zoom-><a href="ntqwidget.html#height">height</a>()+4 : 0, pm, 0,0, width(), height()-yoffset ); } } <a name="x1801"></a>void MagWidget::<a href="ntqwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> *e ) { if ( !grabbing ) { // prepare to grab... grabbing = TRUE; <a href="ntqobject.html#killTimers">killTimers</a>(); <a href="ntqwidget.html#grabMouse">grabMouse</a>( crossCursor ); grabx = -1; graby = -1; } else { // REALLY prepare to grab <a name="x1780"></a> grabx = <a href="ntqwidget.html#mapToGlobal">mapToGlobal</a>(e-><a href="qmouseevent.html#pos">pos</a>()).x(); graby = <a href="ntqwidget.html#mapToGlobal">mapToGlobal</a>(e-><a href="qmouseevent.html#pos">pos</a>()).y(); } } <a name="x1802"></a>void MagWidget::<a href="ntqwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> * e ) { if ( grabbing && grabx >= 0 && graby >= 0 ) { grabbing = FALSE; grabAround(e-><a href="qmouseevent.html#pos">pos</a>()); <a href="ntqwidget.html#releaseMouse">releaseMouse</a>(); } } void <a name="f490"></a>MagWidget::grabAround(TQPoint pos) { int rx, ry; rx = <a href="ntqwidget.html#mapToGlobal">mapToGlobal</a>(pos).x(); ry = <a href="ntqwidget.html#mapToGlobal">mapToGlobal</a>(pos).y(); int w = TQABS(rx-grabx); int h = TQABS(ry-graby); if ( w > 10 && h > 10 ) { int pz; pz = 1; while ( w*pz*h*pz < width()*(<a href="ntqwidget.html#height">height</a>()-yoffset) && w*pz < TQApplication::<a href="ntqapplication.html#desktop">desktop</a>()->width() && h*pz < TQApplication::<a href="ntqapplication.html#desktop">desktop</a>()->height() ) pz++; if ( (w*pz*h*pz - width()*(<a href="ntqwidget.html#height">height</a>()-yoffset)) > (<a href="ntqwidget.html#width">width</a>()*(<a href="ntqwidget.html#height">height</a>()-yoffset) - w*(pz-1)*h*(pz-1)) ) pz--; if ( pz < 1 ) pz = 1; if ( pz > 8 ) pz = 8; if ( zoom ) <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="ntqwidget.html#resize">resize</a>( w*z, h*z+yoffset ); } grab(); if ( r ) <a href="ntqobject.html#startTimer">startTimer</a>( timer[r] ); } <a name="x1800"></a>void MagWidget::<a href="ntqwidget.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="ntqwidget.html#fontMetrics">fontMetrics</a>().height() - 4 : 0) || e-><a href="qmouseevent.html#pos">pos</a>().y() < (zoom ? zoom-><a href="ntqwidget.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="ntqwidget.html#height">height</a>() : 0 ) - 4) / z; <a href="ntqstring.html">TQString</a> pixelinfo; <a name="x1777"></a> if ( image.<a href="ntqimage.html#valid">valid</a>(x,y) ) { <a name="x1776"></a> TQRgb px = image.<a href="ntqimage.html#pixel">pixel</a>(x,y); <a name="x1795"></a> pixelinfo.<a href="ntqstring.html#sprintf">sprintf</a>(" %3d,%3d,%3d #%02x%02x%02x", <a href="ntqcolor.html#qRed">tqRed</a>(px), tqGreen(px), tqBlue(px), <a href="ntqcolor.html#qRed">tqRed</a>(px), tqGreen(px), tqBlue(px)); } <a href="ntqstring.html">TQString</a> label; label.<a href="ntqstring.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="ntqwidget.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="ntqobject.html#timerEvent">timerEvent</a>( <a href="qtimerevent.html">TQTimerEvent</a> * ) { grab(); /* if ( multiSaveButton-><a href="ntqbutton.html#isOn">isOn</a>() && !multifn.<a href="ntqstring.html#isEmpty">isEmpty</a>() ) { <a href="ntqregexp.html">TQRegExp</a> num("[0-9][0-9]*"); int start; int len; <a name="x1791"></a> if ((start=num.<a href="ntqregexp.html#match">match</a>(multifn,0,&len))>=0) <a name="x1794"></a> multifn.<a href="ntqstring.html#replace">replace</a>(num, <a name="x1793"></a> TQString().setNum(multifn.<a href="ntqstring.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="ntqwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">TQResizeEvent</a> * ) { rgb-><a href="ntqwidget.html#setGeometry">setGeometry</a>( 0, height() - rgb-><a href="ntqwidget.html#height">height</a>(), width(), rgb-><a href="ntqwidget.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="ntqwidget.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>