package CannonField;
use Qt 2.0;
use Qt::signals 'angleChanged(int)';
use Qt::slots 'setAngle(int)';
@ISA = qw(Qt::Widget);
sub new {
    my $self = shift->SUPER::new(@_);
    $self->{'ang'} = 45;
    return $self;
}
sub angle { return shift->{'ang'} }
sub setAngle {
    my $self = shift;
    my $degrees = shift;
    $degrees = 5 if $degrees < 5;
    $degrees = 70 if $degrees > 70;
    return if $self->{'ang'} == $degrees;
    $self->{'ang'} = $degrees;
    $self->repaint();
    emit $self->angleChanged($self->{'ang'});
}
sub paintEvent {
    my $self = shift;
    $self->drawText(200, 100, "Angle = $self->{'ang'}");
}