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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 >
< 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 = "tqpixmap-h.html" > tqpixmap.h< / a > >
#include < < a href = "tqimage-h.html" > tqimage.h< / a > >
#include < < a href = "tqlabel-h.html" > tqlabel.h< / a > >
#include < < a href = "tqfiledialog-h.html" > tqfiledialog.h< / a > >
#include < < a href = "tqregexp-h.html" > tqregexp.h< / a > >
#include < < a href = "qapplication-h.html" > ntqapplication.h< / a > >
#include < < a href = "tqpainter-h.html" > tqpainter.h< / a > >
#include < < a href = "tqwmatrix-h.html" > tqwmatrix.h< / a > >
class MagWidget : public < a href = "tqwidget.html" > TQWidget< / a >
{
< a href = "metaobjects.html#TQ_OBJECT" > TQ_OBJECT< / a >
public:
MagWidget( < a href = "tqwidget.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 = "tqpaintevent.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 = "tqtimerevent.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 = "tqpixmap.html" > TQPixmap< / a > pm; // pixmap, magnified
< a href = "tqpixmap.html" > TQPixmap< / a > p; // pixmap
< a href = "tqimage.html" > TQImage< / a > image; // image of pixmap (for RGB)
< a href = "tqlabel.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 = "tqstring.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 = "tqwidget.html" > TQWidget< / a > *parent, const char *name )
: < a href = "tqwidget.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 = "tqobject.html#connect" > connect< / a > ( zoom, TQ_SIGNAL(< a href = "ntqcombobox.html#activated" > activated< / a > (int)), TQ_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 = "tqobject.html#connect" > connect< / a > ( refresh, TQ_SIGNAL(< a href = "ntqcombobox.html#activated" > activated< / a > (int)), TQ_SLOT(setRefresh(int)) );
for( n=0; n< 9; n++) {
< a name = "x1797" > < / a > int w2 = zoom-> < a href = "tqwidget.html#fontMetrics" > fontMetrics< / a > ().width( zoomfactors[n] );
w = TQMAX(w2, w);
}
< a name = "x1807" > < / a > zoom-> < a href = "tqwidget.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 = "tqwidget.html#fontMetrics" > fontMetrics< / a > ().width( refreshrates[n] );
w = TQMAX(w2, w);
}
refresh-> < a href = "tqwidget.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 = "tqobject.html#connect" > connect< / a > ( saveButton, TQ_SIGNAL(< a href = "ntqbutton.html#clicked" > clicked< / a > ()), this, TQ_SLOT(save()) );
< a name = "x1771" > < / a > saveButton-> < a href = "ntqbutton.html#setText" > setText< / a > ( "Save" );
< a name = "x1788" > < / a > saveButton-> < a href = "tqwidget.html#setGeometry" > setGeometry< / a > ( x+w+30+2, 2,
10+saveButton-> < a href = "tqwidget.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 = "tqobject.html#connect" > connect< / a > ( multiSaveButton, TQ_SIGNAL(< a href = "ntqbutton.html#clicked" > clicked< / a > ()), this, TQ_SLOT(multiSave()) );
multiSaveButton-> < a href = "ntqbutton.html#setText" > setText< / a > ( "MultiSave" );
< a name = "x1798" > < / a > multiSaveButton-> < a href = "tqwidget.html#setGeometry" > setGeometry< / a > ( saveButton-> < a href = "tqwidget.html#geometry" > geometry< / a > ().right() + 2, 2,
10+multiSaveButton-> < a href = "tqwidget.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 = "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 > ()) );
quitButton-> < a href = "ntqbutton.html#setText" > setText< / a > ( "Quit" );
quitButton-> < a href = "tqwidget.html#setGeometry" > setGeometry< / a > ( multiSaveButton-> < a href = "tqwidget.html#geometry" > geometry< / a > ().right() + 2, 2,
10+quitButton-> < a href = "tqwidget.html#fontMetrics" > fontMetrics< / a > ().width("Quit"), 20 );
#else
zoom = 0;
multiSaveButton = 0;
#endif
setRefresh(1);
setZoom(5);
rgb = new < a href = "tqlabel.html" > TQLabel< / a > ( this );
< a href = "ntqapplication.html#TQ_CHECK_PTR" > TQ_CHECK_PTR< / a > ( rgb );
< a name = "x1779" > < / a > rgb-> < a href = "tqlabel.html#setText" > setText< / a > ( "" );
rgb-> < a href = "tqlabel.html#setAlignment" > setAlignment< / a > ( AlignVCenter );
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 );
#ifdef COMPLEX_GUI
< a name = "x1799" > < / a > yoffset = zoom-> < a href = "tqwidget.html#height" > height< / a > () // top buttons
+ 4 // space around top buttons
+ rgb-> < a href = "tqwidget.html#height" > height< / a > (); // color-value text height
< a name = "x1804" > < / a > < a href = "tqwidget.html#setMinimumSize" > setMinimumSize< / a > ( quitButton-> < a href = "tqwidget.html#pos" > pos< / a > ().x(), yoffset+20 );
< a href = "tqwidget.html#resize" > resize< / a > ( quitButton-> < a href = "tqwidget.html#geometry" > geometry< / a > ().topRight().x() + 2, yoffset+60 );
#else
yoffset = 0;
< a href = "tqwidget.html#resize" > resize< / a > (350,350);
#endif
grabx = graby = -1;
grabbing = FALSE;
< a href = "tqwidget.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 = "tqobject.html#killTimers" > killTimers< / a > ();
if (index & & !grabbing)
< a href = "tqobject.html#startTimer" > startTimer< / a > ( timer[r] );
}
void < a name = "f487" > < / a > MagWidget::save()
{
< a name = "x1785" > < / a > if ( !p.< a href = "tqpixmap.html#isNull" > isNull< / a > () ) {
< a href = "tqobject.html#killTimers" > killTimers< / a > ();
< a name = "x1775" > < / a > < a href = "tqstring.html" > TQString< / a > fn = TQFileDialog::< a href = "tqfiledialog.html#getSaveFileName" > getSaveFileName< / a > ();
< a name = "x1792" > < / a > if ( !fn.< a href = "tqstring.html#isEmpty" > isEmpty< / a > () )
< a name = "x1786" > < / a > p.< a href = "tqpixmap.html#save" > save< / a > ( fn, "BMP" );
if ( r )
< a href = "tqobject.html#startTimer" > startTimer< / a > ( timer[r] );
}
}
void < a name = "f488" > < / a > MagWidget::multiSave()
{
if ( !p.< a href = "tqpixmap.html#isNull" > isNull< / a > () ) {
multifn = ""; // stops saving
multifn = TQFileDialog::< a href = "tqfiledialog.html#getSaveFileName" > getSaveFileName< / a > ();
if ( multifn.< a href = "tqstring.html#isEmpty" > isEmpty< / a > () )
< a name = "x1789" > < / a > multiSaveButton-> < a href = "ntqpushbutton.html#setOn" > setOn< / a > (FALSE);
if ( !r )
p.< a href = "tqpixmap.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 = "tqwidget.html#width" > width< / a > ()+z-1)/z;
h = (< a href = "tqwidget.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 = "tqpixmap.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 = "tqpixmap.html#convertToImage" > convertToImage< / a > ();
< a href = "tqwmatrix.html" > TQWMatrix< / a > m; // after getting it, scale it
< a name = "x1809" > < / a > m.< a href = "tqwmatrix.html#scale" > scale< / a > ( (double)z, (double)z );
< a name = "x1787" > < / a > pm = p.< a href = "tqpixmap.html#xForm" > xForm< / a > ( m );
< a name = "x1770" > < / a > if ( !multiSaveButton || !multiSaveButton-> < a href = "ntqbutton.html#isOn" > isOn< / a > () )
< a href = "tqwidget.html#repaint" > repaint< / a > ( FALSE ); // and finally repaint, flicker-free
}
< a name = "x1803" > < / a > void MagWidget::< a href = "tqwidget.html#paintEvent" > paintEvent< / a > ( < a href = "tqpaintevent.html" > TQPaintEvent< / a > * )
{
if ( !pm.< a href = "tqpixmap.html#isNull" > isNull< / a > () ) {
< a href = "tqpainter.html" > TQPainter< / a > paint( this );
< 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,
0,0, width(), height()-yoffset );
}
}
< a name = "x1801" > < / a > void MagWidget::< a href = "tqwidget.html#mousePressEvent" > mousePressEvent< / a > ( < a href = "qmouseevent.html" > TQMouseEvent< / a > *e )
{
if ( !grabbing ) { // prepare to grab...
grabbing = TRUE;
< a href = "tqobject.html#killTimers" > killTimers< / a > ();
< a href = "tqwidget.html#grabMouse" > grabMouse< / a > ( crossCursor );
grabx = -1;
graby = -1;
} else { // REALLY prepare to grab
< a name = "x1780" > < / a > grabx = < a href = "tqwidget.html#mapToGlobal" > mapToGlobal< / a > (e-> < a href = "qmouseevent.html#pos" > pos< / a > ()).x();
graby = < a href = "tqwidget.html#mapToGlobal" > mapToGlobal< / a > (e-> < a href = "qmouseevent.html#pos" > pos< / a > ()).y();
}
}
< a name = "x1802" > < / a > void MagWidget::< a href = "tqwidget.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 = "tqwidget.html#releaseMouse" > releaseMouse< / a > ();
}
}
void < a name = "f490" > < / a > MagWidget::grabAround(TQPoint pos)
{
int rx, ry;
rx = < a href = "tqwidget.html#mapToGlobal" > mapToGlobal< / a > (pos).x();
ry = < a href = "tqwidget.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 = "tqwidget.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 = "tqwidget.html#height" > height< / a > ()-yoffset)) >
(< a href = "tqwidget.html#width" > width< / a > ()*(< a href = "tqwidget.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 = "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 = "tqpixmap.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 = "tqlabel.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 = "tqlabel.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 = "tqlabel.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 = "tqpixmap.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 > .
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< 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 >
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