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package CannonField;
use strict;
use TQt;
use TQt::isa qw(TQt::Widget);
use TQt::signals
angleChanged => ['int'],
forceChanged => ['int'];
use TQt::slots
setAngle => ['int'],
setForce => ['int'],
shoot => [],
moveShot => [];
use TQt::attributes qw(
ang
f
timerCount
autoShootTimer
shoot_ang
shoot_f
);
use POSIX qw(atan);
sub angle () { ang }
sub force () { f }
sub NEW {
shift->SUPER::NEW(@_);
ang = 45;
f = 0;
timerCount = 0;
autoShootTimer = TQt::Timer(this, "movement handler");
this->connect(autoShootTimer, TQ_SIGNAL('timeout()'), TQ_SLOT('moveShot()'));
shoot_ang = 0;
shoot_f = 0;
setPalette(TQt::Palette(TQt::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 shoot {
return if autoShootTimer->isActive;
timerCount = 0;
shoot_ang = ang;
shoot_f = f;
autoShootTimer->start(50);
}
sub moveShot {
my $r = TQt::Region(shotRect());
timerCount++;
my $shotR = shotRect();
if($shotR->x > width() || $shotR->y > height()) {
autoShootTimer->stop;
} else {
$r = $r->unite(TQt::Region($shotR));
}
repaint($r);
}
sub paintEvent {
my $e = shift;
my $updateR = $e->rect;
my $p = TQt::Painter(this);
paintCannon($p) if $updateR->intersects(cannonRect());
paintShot($p) if autoShootTimer->isActive and $updateR->intersects(shotRect());
}
sub paintShot {
my $p = shift;
$p->setBrush(&black);
$p->setPen(&NoPen);
$p->drawRect(shotRect());
}
my $barrelRect = TQt::Rect(33, -4, 15, 8);
sub paintCannon {
my $p = shift;
my $cr = cannonRect();
my $pix = TQt::Pixmap($cr->size);
$pix->fill(this, $cr->topLeft);
my $tmp = TQt::Painter($pix);
$tmp->setBrush(&blue);
$tmp->setPen(&NoPen);
$tmp->translate(0, $pix->height - 1);
$tmp->drawPie(TQt::Rect(-35, -35, 70, 70), 0, 90*16);
$tmp->rotate(- ang);
$tmp->drawRect($barrelRect);
$tmp->end;
$p->drawPixmap($cr->topLeft, $pix);
}
sub cannonRect {
my $r = TQt::Rect(0, 0, 50, 50);
$r->moveBottomLeft(rect()->bottomLeft);
return $r;
}
sub shotRect {
my $gravity = 4;
my $time = timerCount / 4.0;
my $velocity = shoot_f;
my $radians = shoot_ang*3.14159265/180;
my $velx = $velocity*cos($radians);
my $vely = $velocity*sin($radians);
my $x0 = ($barrelRect->right + 5)*cos($radians);
my $y0 = ($barrelRect->right + 5)*sin($radians);
my $x = $x0 + $velx*$time;
my $y = $y0 + $vely*$time - 0.5*$gravity*$time**2;
my $r = TQt::Rect(0, 0, 6, 6);
$r->moveCenter(TQt::Point(int($x), height() - 1 - int($y)));
return $r;
}
sub sizePolicy {
TQt::SizePolicy(&TQt::SizePolicy::Expanding, &TQt::SizePolicy::Expanding);
}
1;
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