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128 lines
4.4 KiB
C++
128 lines
4.4 KiB
C++
/*******************************************************************************
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* gui/elastic/arrow.cpp *
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* *
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* Copyright (c) 2012, RetroShare Team <retroshare.project@gmail.com> *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU Affero General Public License as *
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* published by the Free Software Foundation, either version 3 of the *
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* License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU Affero General Public License for more details. *
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* *
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* You should have received a copy of the GNU Affero General Public License *
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* along with this program. If not, see <https://www.gnu.org/licenses/>. *
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* *
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*******************************************************************************/
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// This code is inspired from http://doc.qt.io/qt-5/qtwidgets-graphicsview-diagramscene-arrow-cpp.html
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#include <QPainter>
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#include "arrow.h"
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#include "elnode.h"
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#include <math.h>
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static const double Pi = 3.14159265358979323846264338327950288419717;
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static double TwoPi = 2.0 * Pi;
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Arrow::Arrow(Node *sourceNode, Node *destNode)
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: arrowSize(10)
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{
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setAcceptedMouseButtons(0);
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source = sourceNode;
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dest = destNode;
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#ifdef SUSP
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source->addArrow(this);
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dest->addArrow(this);
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#endif
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adjust();
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}
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Arrow::~Arrow()
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{
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}
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Node *Arrow::sourceNode() const
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{
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return source;
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}
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void Arrow::setSourceNode(Node *node)
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{
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source = node;
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adjust();
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}
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Node *Arrow::destNode() const
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{
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return dest;
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}
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void Arrow::setDestNode(Node *node)
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{
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dest = node;
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adjust();
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}
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void Arrow::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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QPointF edgeOffset((line.dx() * 10) / length, (line.dy() * 10) / length);
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prepareGeometryChange();
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sourcePoint = line.p1() + edgeOffset;
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destPoint = line.p2() - edgeOffset;
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}
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QRectF Arrow::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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void Arrow::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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// Draw the line itself
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QLineF line(sourcePoint, destPoint);
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//painter->setPen(QPen(Qt::black, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
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painter->setPen(QPen(Qt::red, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
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painter->drawLine(line);
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// Draw the arrows if there's enough room
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double angle = ::acos(line.dx() / line.length());
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if (line.dy() >= 0)
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angle = TwoPi - angle;
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QPointF sourceArrowP1 = sourcePoint + QPointF(sin(angle + Pi / 3) * arrowSize,
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cos(angle + Pi / 3) * arrowSize);
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QPointF sourceArrowP2 = sourcePoint + QPointF(sin(angle + Pi - Pi / 3) * arrowSize,
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cos(angle + Pi - Pi / 3) * arrowSize);
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QPointF destArrowP1 = destPoint + QPointF(sin(angle - Pi / 3) * arrowSize,
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cos(angle - Pi / 3) * arrowSize);
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QPointF destArrowP2 = destPoint + QPointF(sin(angle - Pi + Pi / 3) * arrowSize,
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cos(angle - Pi + 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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