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+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above copyright
+** notice, this list of conditions and the following disclaimer in
+** the documentation and/or other materials provided with the
+** distribution.
+** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+** the names of its contributors may be used to endorse or promote
+** products derived from this software without specific prior written
+** permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtWidgets>
+
+#include "arrow.h"
+#include <math.h>
+
+const qreal Pi = 3.14;
+
+//! [0]
+Arrow::Arrow(DiagramItem *startItem, DiagramItem *endItem, QGraphicsItem *parent)
+ : QGraphicsLineItem(parent)
+{
+ myStartItem = startItem;
+ myEndItem = endItem;
+ setFlag(QGraphicsItem::ItemIsSelectable, true);
+ myColor = Qt::black;
+ setPen(QPen(myColor, 2, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
+}
+//! [0]
+
+//! [1]
+QRectF Arrow::boundingRect() const
+{
+ qreal extra = (pen().width() + 20) / 2.0;
+
+ return QRectF(line().p1(), QSizeF(line().p2().x() - line().p1().x(),
+ line().p2().y() - line().p1().y()))
+ .normalized()
+ .adjusted(-extra, -extra, extra, extra);
+}
+//! [1]
+
+//! [2]
+QPainterPath Arrow::shape() const
+{
+ QPainterPath path = QGraphicsLineItem::shape();
+ path.addPolygon(arrowHead);
+ return path;
+}
+//! [2]
+
+//! [3]
+void Arrow::updatePosition()
+{
+ QLineF line(mapFromItem(myStartItem, 0, 0), mapFromItem(myEndItem, 0, 0));
+ setLine(line);
+}
+//! [3]
+
+//! [4]
+void Arrow::paint(QPainter *painter, const QStyleOptionGraphicsItem *,
+ QWidget *)
+{
+ if (myStartItem->collidesWithItem(myEndItem))
+ return;
+
+ QPen myPen = pen();
+ myPen.setColor(myColor);
+ qreal arrowSize = 20;
+ painter->setPen(myPen);
+ painter->setBrush(myColor);
+//! [4] //! [5]
+
+ QLineF centerLine(myStartItem->pos(), myEndItem->pos());
+ QPolygonF endPolygon = myEndItem->polygon();
+ QPointF p1 = endPolygon.first() + myEndItem->pos();
+ QPointF p2;
+ QPointF intersectPoint;
+ QLineF polyLine;
+ for (int i = 1; i < endPolygon.count(); ++i) {
+ p2 = endPolygon.at(i) + myEndItem->pos();
+ polyLine = QLineF(p1, p2);
+ QLineF::IntersectType intersectType =
+ polyLine.intersect(centerLine, &intersectPoint);
+ if (intersectType == QLineF::BoundedIntersection)
+ break;
+ p1 = p2;
+ }
+
+ setLine(QLineF(intersectPoint, myStartItem->pos()));
+//! [5] //! [6]
+
+ double angle = ::acos(line().dx() / line().length());
+ if (line().dy() >= 0)
+ angle = (Pi * 2) - angle;
+
+ QPointF arrowP1 = line().p1() + QPointF(sin(angle + Pi / 3) * arrowSize,
+ cos(angle + Pi / 3) * arrowSize);
+ QPointF arrowP2 = line().p1() + QPointF(sin(angle + Pi - Pi / 3) * arrowSize,
+ cos(angle + Pi - Pi / 3) * arrowSize);
+
+ arrowHead.clear();
+ arrowHead << line().p1() << arrowP1 << arrowP2;
+//! [6] //! [7]
+ painter->drawLine(line());
+ painter->drawPolygon(arrowHead);
+ if (isSelected()) {
+ painter->setPen(QPen(myColor, 1, Qt::DashLine));
+ QLineF myLine = line();
+ myLine.translate(0, 4.0);
+ painter->drawLine(myLine);
+ myLine.translate(0,-8.0);
+ painter->drawLine(myLine);
+ }
+}
+//! [7]