mirror of
https://github.com/crystalidea/qt6windows7.git
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105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
// 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 "edge.h"
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#include "node.h"
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#include <QPainter>
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#include <QtMath>
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//! [0]
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Edge::Edge(Node *sourceNode, Node *destNode)
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: source(sourceNode), dest(destNode)
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{
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setAcceptedMouseButtons(Qt::NoButton);
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source->addEdge(this);
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dest->addEdge(this);
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adjust();
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}
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//! [0]
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//! [1]
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Node *Edge::sourceNode() const
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{
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return source;
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}
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Node *Edge::destNode() const
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{
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return dest;
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}
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//! [1]
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//! [2]
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void Edge::adjust()
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{
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if (!source || !dest)
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return;
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QLineF line(mapFromItem(source, 0, 0), mapFromItem(dest, 0, 0));
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qreal length = line.length();
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prepareGeometryChange();
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if (length > qreal(20.)) {
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QPointF edgeOffset((line.dx() * 10) / length, (line.dy() * 10) / length);
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sourcePoint = line.p1() + edgeOffset;
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destPoint = line.p2() - edgeOffset;
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} else {
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sourcePoint = destPoint = line.p1();
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}
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}
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//! [2]
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//! [3]
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QRectF Edge::boundingRect() const
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{
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if (!source || !dest)
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return QRectF();
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qreal penWidth = 1;
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qreal extra = (penWidth + arrowSize) / 2.0;
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return QRectF(sourcePoint, QSizeF(destPoint.x() - sourcePoint.x(),
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destPoint.y() - sourcePoint.y()))
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.normalized()
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.adjusted(-extra, -extra, extra, extra);
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}
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//! [3]
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//! [4]
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void Edge::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
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{
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if (!source || !dest)
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return;
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QLineF line(sourcePoint, destPoint);
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if (qFuzzyCompare(line.length(), qreal(0.)))
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return;
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//! [4]
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//! [5]
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// Draw the line itself
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painter->setPen(QPen(Qt::black, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
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painter->drawLine(line);
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//! [5]
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//! [6]
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// Draw the arrows
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double angle = std::atan2(-line.dy(), line.dx());
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QPointF sourceArrowP1 = sourcePoint + QPointF(sin(angle + M_PI / 3) * arrowSize,
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cos(angle + M_PI / 3) * arrowSize);
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QPointF sourceArrowP2 = sourcePoint + 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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QPointF destArrowP1 = destPoint + QPointF(sin(angle - M_PI / 3) * arrowSize,
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cos(angle - M_PI / 3) * arrowSize);
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QPointF destArrowP2 = destPoint + 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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painter->setBrush(Qt::black);
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painter->drawPolygon(QPolygonF() << line.p1() << sourceArrowP1 << sourceArrowP2);
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painter->drawPolygon(QPolygonF() << line.p2() << destArrowP1 << destArrowP2);
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}
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//! [6]
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