Qt Tutorial - t8/cannon.cpp

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# Source code for tutorial 8: cannon.cpp

    /****************************************************************
    **
    ** Implementation CannonField class, Qt tutorial 8
    **
    ****************************************************************/

    #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 * )
    {
        QString s = "Angle = " + QString::number( ang );
        QPainter p( this );
        p.drawText( 200, 200, s );
    }

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