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