mirror of
https://github.com/crystalidea/qt6windows7.git
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103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
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// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "arrow.h"
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#include "diagramitem.h"
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#include <QPainter>
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#include <QPen>
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#include <QtMath>
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//! [0]
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Arrow::Arrow(DiagramItem *startItem, DiagramItem *endItem, QGraphicsItem *parent)
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: QGraphicsLineItem(parent), myStartItem(startItem), myEndItem(endItem)
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{
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setFlag(QGraphicsItem::ItemIsSelectable, true);
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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 intersectPoint;
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for (int i = 1; i < endPolygon.count(); ++i) {
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QPointF p2 = endPolygon.at(i) + myEndItem->pos();
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QLineF polyLine = QLineF(p1, p2);
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QLineF::IntersectionType intersectionType =
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polyLine.intersects(centerLine, &intersectPoint);
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if (intersectionType == 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 = std::atan2(-line().dy(), line().dx());
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QPointF arrowP1 = line().p1() + QPointF(sin(angle + M_PI / 3) * arrowSize,
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cos(angle + M_PI / 3) * arrowSize);
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QPointF arrowP2 = line().p1() + QPointF(sin(angle + M_PI - M_PI / 3) * arrowSize,
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cos(angle + M_PI - M_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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