diff options
Diffstat (limited to 'doc/html/qmag-example.html')
| -rw-r--r-- | doc/html/qmag-example.html | 446 |
1 files changed, 446 insertions, 0 deletions
diff --git a/doc/html/qmag-example.html b/doc/html/qmag-example.html new file mode 100644 index 0000000..a030554 --- /dev/null +++ b/doc/html/qmag-example.html @@ -0,0 +1,446 @@ +<!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>QMag</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>QMag</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 Qt. +<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 Qt. This example +** program may be used, distributed and modified without limitation. +** +*****************************************************************************/ + +#include <<a href="qcombobox-h.html">qcombobox.h</a>> +#include <<a href="qpushbutton-h.html">qpushbutton.h</a>> +#include <<a href="qpixmap-h.html">qpixmap.h</a>> +#include <<a href="qimage-h.html">qimage.h</a>> +#include <<a href="qlabel-h.html">qlabel.h</a>> +#include <<a href="qfiledialog-h.html">qfiledialog.h</a>> +#include <<a href="qregexp-h.html">qregexp.h</a>> + +#include <<a href="qapplication-h.html">qapplication.h</a>> +#include <<a href="qpainter-h.html">qpainter.h</a>> +#include <<a href="qwmatrix-h.html">qwmatrix.h</a>> + + +class MagWidget : public <a href="qwidget.html">QWidget</a> +{ + <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a> +public: + MagWidget( <a href="qwidget.html">QWidget</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">QPaintEvent</a> * ); + void mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> * ); + void mouseReleaseEvent( <a href="qmouseevent.html">QMouseEvent</a> * ); + void mouseMoveEvent( <a href="qmouseevent.html">QMouseEvent</a> * ); + void focusOutEvent( <a href="qfocusevent.html">QFocusEvent</a> * ); + void timerEvent( <a href="qtimerevent.html">QTimerEvent</a> * ); + void resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * ); + +private: + void grabAround(QPoint pos); + void grab(); + + <a href="qcombobox.html">QComboBox</a> *zoom; + <a href="qcombobox.html">QComboBox</a> *refresh; + <a href="qpushbutton.html">QPushButton</a> *saveButton; + <a href="qpushbutton.html">QPushButton</a> *multiSaveButton; + <a href="qpushbutton.html">QPushButton</a> *quitButton; + <a href="qpixmap.html">QPixmap</a> pm; // pixmap, magnified + <a href="qpixmap.html">QPixmap</a> p; // pixmap + <a href="qimage.html">QImage</a> image; // image of pixmap (for RGB) + <a href="qlabel.html">QLabel</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="qstring.html">QString</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="qwidget.html">QWidget</a> *parent, const char *name ) + : <a href="qwidget.html">QWidget</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="qcombobox.html">QComboBox</a>( FALSE, this ); + <a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>(zoom); +<a name="x1773"></a> zoom-><a href="qcombobox.html#insertStrList">insertStrList</a>( zoomfactors, 9 ); +<a name="x1772"></a> <a href="qobject.html#connect">connect</a>( zoom, SIGNAL(<a href="qcombobox.html#activated">activated</a>(int)), SLOT(setZoom(int)) ); + + refresh = new <a href="qcombobox.html">QComboBox</a>( FALSE, this ); + <a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>(refresh); + refresh-><a href="qcombobox.html#insertStrList">insertStrList</a>( refreshrates, 9 ); + <a href="qobject.html#connect">connect</a>( refresh, SIGNAL(<a href="qcombobox.html#activated">activated</a>(int)), SLOT(setRefresh(int)) ); + + for( n=0; n<9; n++) { +<a name="x1797"></a> int w2 = zoom-><a href="qwidget.html#fontMetrics">fontMetrics</a>().width( zoomfactors[n] ); + w = QMAX(w2, w); + } +<a name="x1807"></a> zoom-><a href="qwidget.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="qwidget.html#fontMetrics">fontMetrics</a>().width( refreshrates[n] ); + w = QMAX(w2, w); + } + refresh-><a href="qwidget.html#setGeometry">setGeometry</a>( x, 2, w+30, 20 ); + + saveButton = new <a href="qpushbutton.html">QPushButton</a>( this ); + <a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>(saveButton); + <a href="qobject.html#connect">connect</a>( saveButton, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), this, SLOT(save()) ); +<a name="x1771"></a> saveButton-><a href="qbutton.html#setText">setText</a>( "Save" ); +<a name="x1788"></a> saveButton-><a href="qwidget.html#setGeometry">setGeometry</a>( x+w+30+2, 2, + 10+saveButton-><a href="qwidget.html#fontMetrics">fontMetrics</a>().width("Save"), 20 ); + + multiSaveButton = new <a href="qpushbutton.html">QPushButton</a>( this ); +<a name="x1790"></a> multiSaveButton-><a href="qpushbutton.html#setToggleButton">setToggleButton</a>(TRUE); + <a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>(multiSaveButton); + <a href="qobject.html#connect">connect</a>( multiSaveButton, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), this, SLOT(multiSave()) ); + multiSaveButton-><a href="qbutton.html#setText">setText</a>( "MultiSave" ); +<a name="x1798"></a> multiSaveButton-><a href="qwidget.html#setGeometry">setGeometry</a>( saveButton-><a href="qwidget.html#geometry">geometry</a>().right() + 2, 2, + 10+multiSaveButton-><a href="qwidget.html#fontMetrics">fontMetrics</a>().width("MultiSave"), 20 ); + + quitButton = new <a href="qpushbutton.html">QPushButton</a>( this ); + <a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>(quitButton); + <a href="qobject.html#connect">connect</a>( quitButton, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), qApp, SLOT(<a href="qapplication.html#quit">quit</a>()) ); + quitButton-><a href="qbutton.html#setText">setText</a>( "Quit" ); + quitButton-><a href="qwidget.html#setGeometry">setGeometry</a>( multiSaveButton-><a href="qwidget.html#geometry">geometry</a>().right() + 2, 2, + 10+quitButton-><a href="qwidget.html#fontMetrics">fontMetrics</a>().width("Quit"), 20 ); +#else + zoom = 0; + multiSaveButton = 0; +#endif + + setRefresh(1); + setZoom(5); + + rgb = new <a href="qlabel.html">QLabel</a>( this ); + <a href="qapplication.html#Q_CHECK_PTR">Q_CHECK_PTR</a>( rgb ); +<a name="x1779"></a> rgb-><a href="qlabel.html#setText">setText</a>( "" ); + rgb-><a href="qlabel.html#setAlignment">setAlignment</a>( AlignVCenter ); + rgb-><a href="qwidget.html#resize">resize</a>( <a href="qwidget.html#width">width</a>(), rgb-><a href="qwidget.html#fontMetrics">fontMetrics</a>().height() + 4 ); + +#ifdef COMPLEX_GUI +<a name="x1799"></a> yoffset = zoom-><a href="qwidget.html#height">height</a>() // top buttons + + 4 // space around top buttons + + rgb-><a href="qwidget.html#height">height</a>(); // color-value text height +<a name="x1804"></a> <a href="qwidget.html#setMinimumSize">setMinimumSize</a>( quitButton-><a href="qwidget.html#pos">pos</a>().x(), yoffset+20 ); + <a href="qwidget.html#resize">resize</a>( quitButton-><a href="qwidget.html#geometry">geometry</a>().topRight().x() + 2, yoffset+60 ); +#else + yoffset = 0; + <a href="qwidget.html#resize">resize</a>(350,350); +#endif + + grabx = graby = -1; + grabbing = FALSE; + + <a href="qwidget.html#setMouseTracking">setMouseTracking</a>( TRUE ); // and do let me know what pixel I'm at, eh? + +<a name="x1765"></a> grabAround( QPoint(grabx=qApp-><a href="qapplication.html#desktop">desktop</a>()->width()/2, graby=qApp-><a href="qapplication.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="qobject.html#killTimers">killTimers</a>(); + if (index && !grabbing) + <a href="qobject.html#startTimer">startTimer</a>( timer[r] ); +} + + +void <a name="f487"></a>MagWidget::save() +{ +<a name="x1785"></a> if ( !p.<a href="qpixmap.html#isNull">isNull</a>() ) { + <a href="qobject.html#killTimers">killTimers</a>(); +<a name="x1775"></a> <a href="qstring.html">QString</a> fn = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>(); +<a name="x1792"></a> if ( !fn.<a href="qstring.html#isEmpty">isEmpty</a>() ) +<a name="x1786"></a> p.<a href="qpixmap.html#save">save</a>( fn, "BMP" ); + if ( r ) + <a href="qobject.html#startTimer">startTimer</a>( timer[r] ); + } +} + +void <a name="f488"></a>MagWidget::multiSave() +{ + if ( !p.<a href="qpixmap.html#isNull">isNull</a>() ) { + multifn = ""; // stops saving + multifn = QFileDialog::<a href="qfiledialog.html#getSaveFileName">getSaveFileName</a>(); + if ( multifn.<a href="qstring.html#isEmpty">isEmpty</a>() ) +<a name="x1789"></a> multiSaveButton-><a href="qpushbutton.html#setOn">setOn</a>(FALSE); + if ( !r ) + p.<a href="qpixmap.html#save">save</a>( multifn, "BMP" ); + } else { + multiSaveButton-><a href="qpushbutton.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="qwidget.html#width">width</a>()+z-1)/z; + h = (<a href="qwidget.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 > QApplication::<a href="qapplication.html#desktop">desktop</a>()->width() ) + x = QApplication::<a href="qapplication.html#desktop">desktop</a>()->width()-w; + else if ( x < 0 ) + x = 0; + if ( y + h > QApplication::<a href="qapplication.html#desktop">desktop</a>()->height() ) + y = QApplication::<a href="qapplication.html#desktop">desktop</a>()->height()-h; + else if ( y < 0 ) + y = 0; + +<a name="x1784"></a> p = QPixmap::<a href="qpixmap.html#grabWindow">grabWindow</a>( QApplication::<a href="qapplication.html#desktop">desktop</a>()->winId(), x, y, w, h ); +<a name="x1783"></a> image = p.<a href="qpixmap.html#convertToImage">convertToImage</a>(); + <a href="qwmatrix.html">QWMatrix</a> m; // after getting it, scale it +<a name="x1809"></a> m.<a href="qwmatrix.html#scale">scale</a>( (double)z, (double)z ); +<a name="x1787"></a> pm = p.<a href="qpixmap.html#xForm">xForm</a>( m ); + +<a name="x1770"></a> if ( !multiSaveButton || !multiSaveButton-><a href="qbutton.html#isOn">isOn</a>() ) + <a href="qwidget.html#repaint">repaint</a>( FALSE ); // and finally repaint, flicker-free +} + + +<a name="x1803"></a>void MagWidget::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * ) +{ + if ( !pm.<a href="qpixmap.html#isNull">isNull</a>() ) { + <a href="qpainter.html">QPainter</a> paint( this ); +<a name="x1782"></a> paint.<a href="qpainter.html#drawPixmap">drawPixmap</a>( 0, zoom ? zoom-><a href="qwidget.html#height">height</a>()+4 : 0, pm, + 0,0, width(), height()-yoffset ); + } +} + + +<a name="x1801"></a>void MagWidget::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e ) +{ + if ( !grabbing ) { // prepare to grab... + grabbing = TRUE; + <a href="qobject.html#killTimers">killTimers</a>(); + <a href="qwidget.html#grabMouse">grabMouse</a>( crossCursor ); + grabx = -1; + graby = -1; + } else { // REALLY prepare to grab +<a name="x1780"></a> grabx = <a href="qwidget.html#mapToGlobal">mapToGlobal</a>(e-><a href="qmouseevent.html#pos">pos</a>()).x(); + graby = <a href="qwidget.html#mapToGlobal">mapToGlobal</a>(e-><a href="qmouseevent.html#pos">pos</a>()).y(); + } +} + + + +<a name="x1802"></a>void MagWidget::<a href="qwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> * e ) +{ + if ( grabbing && grabx >= 0 && graby >= 0 ) { + grabbing = FALSE; + grabAround(e-><a href="qmouseevent.html#pos">pos</a>()); + <a href="qwidget.html#releaseMouse">releaseMouse</a>(); + } +} + +void <a name="f490"></a>MagWidget::grabAround(QPoint pos) +{ + int rx, ry; + rx = <a href="qwidget.html#mapToGlobal">mapToGlobal</a>(pos).x(); + ry = <a href="qwidget.html#mapToGlobal">mapToGlobal</a>(pos).y(); + int w = QABS(rx-grabx); + int h = QABS(ry-graby); + if ( w > 10 && h > 10 ) { + int pz; + pz = 1; + while ( w*pz*h*pz < width()*(<a href="qwidget.html#height">height</a>()-yoffset) && + w*pz < QApplication::<a href="qapplication.html#desktop">desktop</a>()->width() && + h*pz < QApplication::<a href="qapplication.html#desktop">desktop</a>()->height() ) + pz++; + if ( (w*pz*h*pz - width()*(<a href="qwidget.html#height">height</a>()-yoffset)) > + (<a href="qwidget.html#width">width</a>()*(<a href="qwidget.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="qcombobox.html#setCurrentItem">setCurrentItem</a>( pz-1 ); + + z = pz; + grabx = QMIN(rx, grabx) + w/2; + graby = QMIN(ry, graby) + h/2; + <a href="qwidget.html#resize">resize</a>( w*z, h*z+yoffset ); + } + grab(); + if ( r ) + <a href="qobject.html#startTimer">startTimer</a>( timer[r] ); +} + + +<a name="x1800"></a>void MagWidget::<a href="qwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e ) +{ + if ( grabbing || pm.<a href="qpixmap.html#isNull">isNull</a>() || + e-><a href="qmouseevent.html#pos">pos</a>().y() > height() - (zoom ? zoom-><a href="qwidget.html#fontMetrics">fontMetrics</a>().height() - 4 : 0) || + e-><a href="qmouseevent.html#pos">pos</a>().y() < (zoom ? zoom-><a href="qwidget.html#height">height</a>()+4 : 4) ) { + rgb-><a href="qlabel.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="qwidget.html#height">height</a>() : 0 ) - 4) / z; + <a href="qstring.html">QString</a> pixelinfo; +<a name="x1777"></a> if ( image.<a href="qimage.html#valid">valid</a>(x,y) ) + { +<a name="x1776"></a> QRgb px = image.<a href="qimage.html#pixel">pixel</a>(x,y); +<a name="x1795"></a> pixelinfo.<a href="qstring.html#sprintf">sprintf</a>(" %3d,%3d,%3d #%02x%02x%02x", + <a href="qcolor.html#qRed">qRed</a>(px), qGreen(px), qBlue(px), + <a href="qcolor.html#qRed">qRed</a>(px), qGreen(px), qBlue(px)); + } + <a href="qstring.html">QString</a> label; + label.<a href="qstring.html#sprintf">sprintf</a>( "x=%d, y=%d %s", + x+grabx, y+graby, (const char*)pixelinfo ); + rgb-><a href="qlabel.html#setText">setText</a>( label ); + } +} + + +<a name="x1796"></a>void MagWidget::<a href="qwidget.html#focusOutEvent">focusOutEvent</a>( <a href="qfocusevent.html">QFocusEvent</a> * ) +{ + rgb-><a href="qlabel.html#setText">setText</a>( "" ); +} + + +<a name="x1781"></a>void MagWidget::<a href="qobject.html#timerEvent">timerEvent</a>( <a href="qtimerevent.html">QTimerEvent</a> * ) +{ + grab(); +/* + if ( multiSaveButton-><a href="qbutton.html#isOn">isOn</a>() && !multifn.<a href="qstring.html#isEmpty">isEmpty</a>() ) { + <a href="qregexp.html">QRegExp</a> num("[0-9][0-9]*"); + int start; + int len; +<a name="x1791"></a> if ((start=num.<a href="qregexp.html#match">match</a>(multifn,0,&len))>=0) +<a name="x1794"></a> multifn.<a href="qstring.html#replace">replace</a>(num, +<a name="x1793"></a> QString().setNum(multifn.<a href="qstring.html#mid">mid</a>(start,len).toInt()+1) + ); + p.<a href="qpixmap.html#save">save</a>( multifn, "BMP" ); + } +*/ +} + + +<a name="x1806"></a>void MagWidget::<a href="qwidget.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">QResizeEvent</a> * ) +{ + rgb-><a href="qwidget.html#setGeometry">setGeometry</a>( 0, height() - rgb-><a href="qwidget.html#height">height</a>(), width(), rgb-><a href="qwidget.html#height">height</a>() ); + grab(); +} + + +#include "qmag.moc" + + +int main( int argc, char **argv ) +{ + <a href="qapplication.html">QApplication</a> a( argc, argv ); + MagWidget m; + a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &m ); + m.<a href="qwidget.html#show">show</a>(); + return a.<a href="qapplication.html#exec">exec</a>(); +} +</pre> + +<p>See also <a href="examples.html">Examples</a>. + +<!-- eof --> +<p><address><hr><div align=center> +<table width=100% cellspacing=0 border=0><tr> +<td>Copyright © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>Qt 3.3.8</div> +</table></div></address></body> +</html> |