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<!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/hello/hello.doc:5 -->
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Hello, World</title>
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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>Hello, World</h1>

   
<p> 
This example brings up the words "Hello, World" moving up and down,
and in different colors.
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/hello.h   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.
**
*****************************************************************************/

#ifndef HELLO_H
#define HELLO_H

#include &lt;<a href="qwidget-h.html">qwidget.h</a>&gt;


class Hello : public <a href="qwidget.html">TQWidget</a>
{
    <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
    Hello( const char *text, TQWidget *parent=0, const char *name=0 );
signals:
    void clicked();
protected:
    void mouseReleaseEvent( <a href="qmouseevent.html">TQMouseEvent</a> * );
    void paintEvent( <a href="qpaintevent.html">TQPaintEvent</a> * );
private slots:
    void animate();
private:
    <a href="qstring.html">TQString</a> t;
    int     b;
};

#endif
</pre>

<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/hello.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 "hello.h"
#include &lt;<a href="qpushbutton-h.html">qpushbutton.h</a>&gt;
#include &lt;<a href="qtimer-h.html">qtimer.h</a>&gt;
#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
#include &lt;<a href="qpixmap-h.html">qpixmap.h</a>&gt;


/*
  Constructs a Hello widget. Starts a 40 ms animation timer.
*/

<a name="f473"></a>Hello::Hello( const char *text, TQWidget *parent, const char *name )
    : <a href="qwidget.html">TQWidget</a>(parent,name), t(text), b(0)
{
    <a href="qtimer.html">TQTimer</a> *timer = new <a href="qtimer.html">TQTimer</a>(this);
<a name="x1640"></a>    <a href="qobject.html#connect">connect</a>( timer, SIGNAL(<a href="qtimer.html#timeout">timeout</a>()), SLOT(animate()) );
<a name="x1639"></a>    timer-&gt;<a href="qtimer.html#start">start</a>( 40 );

    <a href="qwidget.html#resize">resize</a>( 260, 130 );
}


/*
  This private slot is called each time the timer fires.
*/

void <a name="f474"></a>Hello::animate()
{
    b = (b + 1) &amp; 15;
    <a href="qwidget.html#repaint">repaint</a>( FALSE );
}


/*
  Handles mouse button release events for the Hello widget.

  We emit the clicked() signal when the mouse is released inside
  the widget.
*/

<a name="x1641"></a>void Hello::<a href="qwidget.html#mouseReleaseEvent">mouseReleaseEvent</a>( <a href="qmouseevent.html">TQMouseEvent</a> *e )
{
    if ( <a href="qwidget.html#rect">rect</a>().contains( e-&gt;<a href="qmouseevent.html#pos">pos</a>() ) )
        emit clicked();
}


/*
  Handles paint events for the Hello widget.

  Flicker-free update. The text is first drawn in the pixmap and the
  pixmap is then blt'ed to the screen.
*/

void Hello::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">TQPaintEvent</a> * )
{
    static int sin_tbl[16] = {
        0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38};

    if ( t.isEmpty() )
        return;

    // 1: Compute some sizes, positions etc.
    <a href="qfontmetrics.html">TQFontMetrics</a> fm = <a href="qwidget.html#fontMetrics">fontMetrics</a>();
<a name="x1631"></a>    int w = fm.<a href="qfontmetrics.html#width">width</a>(t) + 20;
<a name="x1630"></a>    int h = fm.<a href="qfontmetrics.html#height">height</a>() * 2;
    int pmx = <a href="qwidget.html#width">width</a>()/2 - w/2;
    int pmy = <a href="qwidget.html#height">height</a>()/2 - h/2;

    // 2: Create the pixmap and fill it with the widget's background
    <a href="qpixmap.html">TQPixmap</a> pm( w, h );
<a name="x1638"></a>    pm.<a href="qpixmap.html#fill">fill</a>( this, pmx, pmy );

    // 3: Paint the pixmap. Cool wave effect
    <a href="qpainter.html">TQPainter</a> p;
    int x = 10;
<a name="x1629"></a>    int y = h/2 + fm.<a href="qfontmetrics.html#descent">descent</a>();
    int i = 0;
<a name="x1633"></a>    p.<a href="qpainter.html#begin">begin</a>( &amp;pm );
<a name="x1636"></a>    p.<a href="qpainter.html#setFont">setFont</a>( <a href="qwidget.html#font">font</a>() );
    while ( !t[i].isNull() ) {
        int i16 = (b+i) &amp; 15;
        p.<a href="qpainter.html#setPen">setPen</a>( TQColor((15-i16)*16,255,255,TQColor::Hsv) );
        p.<a href="qpainter.html#drawText">drawText</a>( x, y-sin_tbl[i16]*h/800, t.mid(i,1), 1 );
        x += fm.<a href="qfontmetrics.html#width">width</a>( t[i] );
        i++;
    }
<a name="x1635"></a>    p.<a href="qpainter.html#end">end</a>();

    // 4: Copy the pixmap to the Hello widget
    <a href="qimage.html#bitBlt">bitBlt</a>( this, pmx, pmy, &amp;pm );
}
</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 "hello.h"
#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;


/*
  The program starts here. It parses the command line and builds a message
  string to be displayed by the Hello widget.
*/

int main( int argc, char **argv )
{
    <a href="qapplication.html">TQApplication</a> a(argc,argv);
    <a href="qstring.html">TQString</a> s;
    for ( int i=1; i&lt;argc; i++ ) {
        s += argv[i];
        if ( i&lt;argc-1 )
            s += " ";
    }
    if ( s.<a href="qstring.html#isEmpty">isEmpty</a>() )
        s = "Hello, World";
    Hello h( s );
#ifndef QT_NO_WIDGET_TOPEXTRA   // for TQt/Embedded minimal build
    h.<a href="qwidget.html#setCaption">setCaption</a>( "TQt says hello" );
#endif
    TQObject::<a href="qobject.html#connect">connect</a>( &amp;h, SIGNAL(clicked()), &amp;a, SLOT(<a href="qapplication.html#tquit">tquit</a>()) );
<a name="x1650"></a>    h.<a href="qwidget.html#setFont">setFont</a>( TQFont("times",32,TQFont::Bold) );         // default font
<a name="x1648"></a>    h.<a href="qwidget.html#setBackgroundColor">setBackgroundColor</a>( TQt::white );                  // default bg color
    a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &amp;h );
    h.<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>.

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