Qt tutorial - t8/cannon.cpp

# Source code for tutorial 8: cannon.cpp

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

    #include "cannon.h"

    CannonField::CannonField( QWidget *parent, const char *name )
            : QWidget( parent, name )
    {
        ang = 45;
    }

    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;
        s.sprintf( "Angle = %i", ang );
        drawText( 200, 100, s );
    }