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package Arrow;
use strict;
use warnings;
use QtCore4;
use QtGui4;
# [0]
use QtCore4::isa qw( Qt::GraphicsLineItem );
use Math::Trig;
use constant
Type => Qt::GraphicsLineItem::UserType() + 4;
sub type()
{ return Type; }
sub setColor
{ this->{myColor} = shift; }
sub startItem()
{ return this->{myStartItem}; }
sub endItem()
{ return this->{myEndItem}; }
use QtCore4::slots
updatePosition => [];
sub myColor() {
return this->{myColor};
}
sub arrowHead() {
return this->{arrowHead};
}
my $Pi = 3.14;
# [0]
sub NEW
{
my ($class, $startItem, $endItem, $parent, $scene) = @_;
$class->SUPER::NEW($parent, $scene);
this->{myStartItem} = $startItem;
this->{myEndItem} = $endItem;
this->setFlag(Qt::GraphicsItem::ItemIsSelectable(), 1);
this->{myColor} = Qt::black();
this->setPen(Qt::Pen(Qt::Brush(this->myColor), 2, Qt::SolidLine(), Qt::RoundCap(), Qt::RoundJoin()));
this->{arrowHead} = Qt::PolygonF();
}
# [0]
# [1]
sub boundingRect
{
my $extra = (this->pen()->width() + 20) / 2.0;
return Qt::RectF(this->line()->p1(), Qt::SizeF(this->line()->p2()->x() - this->line()->p1()->x(),
this->line()->p2()->y() - this->line()->p1()->y()))
->normalized()
->adjusted(-$extra, -$extra, $extra, $extra);
}
# [1]
# [2]
sub shape
{
my $path = Qt::GraphicsLineItem::shape();
$path->addPolygon(this->arrowHead);
return $path;
}
# [2]
# [3]
sub updatePosition
{
my $line = Qt::LineF(this->mapFromItem(this->startItem, 0, 0), this->mapFromItem(this->endItem, 0, 0));
this->setLine($line);
}
# [3]
# [4]
sub paint
{
my ($painter) = @_;
if (this->startItem->collidesWithItem(this->endItem)) {
return;
}
my $myPen = this->pen();
$myPen->setColor(Qt::Color(this->myColor));
my $arrowSize = 20;
$painter->setPen($myPen);
$painter->setBrush(Qt::Brush(this->myColor));
# [4] //! [5]
my $centerLine = Qt::LineF(this->startItem->pos(), this->endItem->pos());
my $endPolygon = Qt::PolygonF(this->endItem->polygon());
my $p1 = $endPolygon->[0] + this->endItem->pos();
my $p2;
my $intersectPoint = Qt::PointF();
my $polyLine;
for (my $i = 1; $i < scalar @{$endPolygon}; ++$i) {
$p2 = $endPolygon->[$i] + this->endItem->pos();
$polyLine = Qt::LineF($p1, $p2);
my $intersectType =
$polyLine->intersect($centerLine, $intersectPoint);
if ($intersectType == Qt::LineF::BoundedIntersection()) {
last;
}
$p1 = $p2;
}
this->setLine(Qt::LineF($intersectPoint, this->startItem->pos()));
# [5] //! [6]
my $angle = acos(this->line()->dx() / this->line()->length());
if (this->line()->dy() >= 0) {
$angle = ($Pi * 2) - $angle;
}
my $arrowP1 = this->line()->p1() + Qt::PointF(sin($angle + $Pi / 3) * $arrowSize,
cos($angle + $Pi / 3) * $arrowSize);
my $arrowP2 = this->line()->p1() + Qt::PointF(sin($angle + $Pi - $Pi / 3) * $arrowSize,
cos($angle + $Pi - $Pi / 3) * $arrowSize);
this->{arrowHead} = Qt::PolygonF( [ this->line->p1(), $arrowP1, $arrowP2 ] );
# [6] //! [7]
$painter->drawLine(this->line());
$painter->drawPolygon(Qt::PolygonF(this->arrowHead));
if (this->isSelected()) {
$painter->setPen(Qt::Pen(Qt::Brush(this->myColor), 1, Qt::DashLine()));
my $myLine = this->line();
$myLine->translate(0, 4.0);
$painter->drawLine($myLine);
$myLine->translate(0,-8.0);
$painter->drawLine($myLine);
}
}
# [7]
1;
|
