File: t8-cannon-cpp.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta name="robots" content="noindex"><title>Qt tutorial - t8/cannon.cpp</title>
</head><body bgcolor="#ffffff">
<p>
<a href=index.html><img width=122 height=65 src=qtlogo.jpg alt="Qt logo" align=left border=0></a>
<center><img src=dochead.gif width=472 height=27></center>
<br clear=all>
<p>
<h1 align=center>Source code for <a href="t8.html">tutorial 8</a>: cannon.cpp</h1><br clear="all">
<hr>
<pre>/****************************************************************
**
** Implementation CannonField class, Qt tutorial 8
**
****************************************************************/

#include "cannon.h"

CannonField::CannonField( <a href="qwidget.html">QWidget</a> *parent, const char *name )
        : <a href="qwidget.html">QWidget</a>( parent, name )
{
    ang = 45;
}

void <a name="390"></a>CannonField::setAngle( int degrees )
{
    if ( degrees &lt; 5 )
        degrees = 5;
    if ( degrees &gt; 70 )
        degrees = 70;
    if ( ang == degrees )
        return;
    ang = degrees;
    <a href="qwidget.html#k0">repaint</a>();
    emit angleChanged( ang );
}

void <a name="391"></a>CannonField::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * )
{
    <a href="qstring.html">QString</a> s;
    s.<a href="qstring.html#c7">sprintf</a>( "Angle = %i", ang );
    <a href="qwidget.html#m4">drawText</a>( 200, 100, s );
}
</pre>
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