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# Source code for tutorial 9: cannon.cpp

    /****************************************************************
    **
    ** Implementation CannonField class, Qt tutorial 9
    **
    ****************************************************************/

    #include "cannon.h"
    #include <qpainter.h>

    CannonField::CannonField( QWidget *parent, const char *name )
            : QWidget( parent, name )
    {
        ang = 45;
        setPalette( QPalette( QColor( 250, 250, 200) ) );
    }

    void CannonField::setAngle( int degrees )
    {
        if ( degrees < 5 )
            degrees = 5;
        if ( degrees > 70 )
            degrees = 70;
        if ( ang == degrees )
            return;
        ang = degrees;
        repaint();
        emit angleChanged( ang );
    }

    void CannonField::paintEvent( QPaintEvent * )
    {
        QPainter p( this );

        p.setBrush( blue );
        p.setPen( NoPen );

        p.translate( 0, rect().bottom() );
        p.drawPie( QRect(-35, -35, 70, 70), 0, 90*16 );
        p.rotate( -ang );
        p.drawRect( QRect(33, -4, 15, 8) );
    }

    QSizePolicy CannonField::sizePolicy() const
    {
        return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
    }