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package CannonField;
use strict;
use Qt;
use Qt::isa qw(Qt::Widget);
use Qt::signals
angleChanged => ['int'],
forceChanged => ['int'];
use Qt::slots
setAngle => ['int'],
setForce => ['int'];
use Qt::attributes qw(
ang
f
);
use POSIX qw(atan);
sub angle () { ang }
sub force () { f }
sub NEW {
shift->SUPER::NEW(@_);
ang = 45;
f = 0;
setPalette(Qt::Palette(Qt::Color(250, 250, 200)));
}
sub setAngle {
my $degrees = shift;
$degrees = 5 if $degrees < 5;
$degrees = 70 if $degrees > 70;
return if ang == $degrees;
ang = $degrees;
repaint(cannonRect(), 0);
emit angleChanged(ang);
}
sub setForce {
my $newton = shift;
$newton = 0 if $newton < 0;
return if f == $newton;
f = $newton;
emit forceChanged(f);
}
sub paintEvent {
my $e = shift;
return unless $e->rect->intersects(cannonRect());
my $cr = cannonRect();
my $pix = Qt::Pixmap($cr->size);
$pix->fill(this, $cr->topLeft);
my $p = Qt::Painter($pix);
$p->setBrush(&blue);
$p->setPen(&NoPen);
$p->translate(0, $pix->height - 1);
$p->drawPie(Qt::Rect(-35, -35, 70, 70), 0, 90*16);
$p->rotate(- ang);
$p->drawRect(Qt::Rect(33, -4, 15, 8));
$p->end;
$p->begin(this);
$p->drawPixmap($cr->topLeft, $pix);
}
sub cannonRect {
my $r = Qt::Rect(0, 0, 50, 50);
$r->moveBottomLeft(rect()->bottomLeft);
return $r;
}
sub sizePolicy {
Qt::SizePolicy(&Qt::SizePolicy::Expanding, &Qt::SizePolicy::Expanding);
}
1;
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