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