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<title>t10/cannon.cpp Example File</title>
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<pre>/****************************************************************
**
** Implementation CannonField class, Qt tutorial 10
**
****************************************************************/

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


<a name="f48"></a>CannonField::CannonField( <a href="qwidget.html">QWidget</a> *parent, const char *name )
        : <a href="qwidget.html">QWidget</a>( parent, name )
{
    ang = 45;
    f = 0;
    <a href="qwidget.html#setPalette">setPalette</a>( QPalette( QColor( 250, 250, 200) ) );
}


void <a name="f49"></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#repaint">repaint</a>( cannonRect(), FALSE );
    emit angleChanged( ang );
}


void <a name="f50"></a>CannonField::setForce( int newton )
{
    if ( newton &lt; 0 )
        newton = 0;
    if ( f == newton )
        return;
    f = newton;
    emit forceChanged( f );
}


void CannonField::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> *e )
{
    if ( !e-&gt;<a href="qpaintevent.html#rect">rect</a>().intersects( cannonRect() ) )
        return;

    <a href="qrect.html">QRect</a> cr = cannonRect();
    <a href="qpixmap.html">QPixmap</a> pix( cr.<a href="qrect.html#size">size</a>() );
    pix.<a href="qpixmap.html#fill">fill</a>( this, cr.<a href="qrect.html#topLeft">topLeft</a>() );

    <a href="qpainter.html">QPainter</a> p( &amp;pix );
    p.<a href="qpainter.html#setBrush">setBrush</a>( blue );
    p.<a href="qpainter.html#setPen">setPen</a>( NoPen );
    p.<a href="qpainter.html#translate">translate</a>( 0, pix.<a href="qpixmap.html#height">height</a>() - 1 );
    p.<a href="qpainter.html#drawPie">drawPie</a>( QRect( -35,-35, 70, 70 ), 0, 90*16 );
    p.<a href="qpainter.html#rotate">rotate</a>( -ang );
    p.<a href="qpainter.html#drawRect">drawRect</a>( QRect(33, -4, 15, 8) );
    p.<a href="qpainter.html#end">end</a>();

    p.<a href="qpainter.html#begin">begin</a>( this );
    p.<a href="qpainter.html#drawPixmap">drawPixmap</a>( cr.<a href="qrect.html#topLeft">topLeft</a>(), pix );
}


QRect <a name="f51"></a>CannonField::cannonRect() const
{
    <a href="qrect.html">QRect</a> r( 0, 0, 50, 50 );
    r.<a href="qrect.html#moveBottomLeft">moveBottomLeft</a>( <a href="qwidget.html#rect">rect</a>().bottomLeft() );
    return r;
}


QSizePolicy CannonField::<a href="qwidget.html#sizePolicy">sizePolicy</a>() const
{
    return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
}
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