doc/html/t9-cannon-cpp.html


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<pre>/****************************************************************
**
** Implementation CannonField class, Qt tutorial 9
**
****************************************************************/

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


<a name="f41"></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#setPalette">setPalette</a>( QPalette( QColor( 250, 250, 200) ) );
}


void <a name="f42"></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>();
    emit angleChanged( ang );
}


void CannonField::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * )
{
    <a href="qpainter.html">QPainter</a> p( this );

    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, rect().bottom() );
    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) );
}


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