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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta name="robots" content="noindex"><title>Qt tutorial - t9/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="t9.html">tutorial 9</a>: cannon.cpp</h1><br clear="all">
<hr>
<pre>/****************************************************************
**
** Implementation CannonField class, Qt tutorial 9
**
****************************************************************/

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

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="392"></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="393"></a>CannonField::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * )
{
    <a href="qpainter.html">QPainter</a> p;
    <a href="qbrush.html">QBrush</a>   brush( blue );
    <a href="qpen.html">QPen</a>     pen( NoPen );

    p.<a href="qpainter.html#b0">begin</a>( this );
    p.<a href="qpainter.html#c8">setBrush</a>( brush );
    p.<a href="qpainter.html#c4">setPen</a>( pen );

    p.<a href="qpainter.html#f2">translate</a>( 0, <a href="qwidget.html#c1">rect</a>().bottom() );
    p.<a href="qpainter.html#j2">drawPie</a>( <a href="qrect.html">QRect</a>(-35, -35, 70, 70), 0, 90*16 );
    p.<a href="qpainter.html#f5">rotate</a>( -ang );
    p.<a href="qpainter.html#i0">drawRect</a>( <a href="qrect.html">QRect</a>(33, -4, 15, 8) );

    p.<a href="qpainter.html#b2">end</a>();
}
</pre>
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