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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Qt Tutorial - t9/cannon.cpp</title>
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<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 <<a href="qpainter-h.html">qpainter.h</a>>
CannonField::CannonField( <a href="qwidget.html">QWidget</a> *parent, const char *name )
: <a href="qwidget.html">QWidget</a>( parent, name )
{
ang = 45;
<a href="qwidget.html#d7e4b9">setPalette</a>( <a href="qpalette.html">QPalette</a>( <a href="qcolor.html">QColor</a>( 250, 250, 200) ) );
}
void <a name="688"></a>CannonField::setAngle( int degrees )
{
if ( degrees < 5 )
degrees = 5;
if ( degrees > 70 )
degrees = 70;
if ( ang == degrees )
return;
ang = degrees;
<a href="qwidget.html#7569b1">repaint</a>();
emit angleChanged( ang );
}
void <a name="689"></a>CannonField::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * )
{
<a href="qpainter.html">QPainter</a> p( this );
p.<a href="qpainter.html#3e0cc8">setBrush</a>( blue );
p.<a href="qpainter.html#0183e4">setPen</a>( NoPen );
p.<a href="qpainter.html#eb778c">translate</a>( 0, <a href="qwidget.html#75ae71">rect</a>().bottom() );
p.<a href="qpainter.html#3ca7a2">drawPie</a>( <a href="qrect.html">QRect</a>(-35, -35, 70, 70), 0, 90*16 );
p.<a href="qpainter.html#b5205c">rotate</a>( -ang );
p.<a href="qpainter.html#4c0077">drawRect</a>( <a href="qrect.html">QRect</a>(33, -4, 15, 8) );
}
<a href="qsizepolicy.html">QSizePolicy</a> <a name="690"></a>CannonField::sizePolicy() const
{
return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
}
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