From 806dda08d685bc5f9ed71dfe8b61f21848d48066 Mon Sep 17 00:00:00 2001 From: Gabriel de Dietrich Date: Fri, 17 Aug 2012 13:23:19 +0200 Subject: Moving .qdoc files under examples/widgets/doc Updated those .qdoc files to refer to the new relative examples emplacement. Images and snippets to be moved later. Also grouped all widgets related examples under widgets. Change-Id: Ib29696e2d8948524537f53e8dda88f9ee26a597f Reviewed-by: J-P Nurmi --- .../widgets/graphicsview/elasticnodes/edge.cpp | 149 +++++++++++++++++++++ 1 file changed, 149 insertions(+) create mode 100644 examples/widgets/graphicsview/elasticnodes/edge.cpp (limited to 'examples/widgets/graphicsview/elasticnodes/edge.cpp') diff --git a/examples/widgets/graphicsview/elasticnodes/edge.cpp b/examples/widgets/graphicsview/elasticnodes/edge.cpp new file mode 100644 index 0000000000..ee7334cdcc --- /dev/null +++ b/examples/widgets/graphicsview/elasticnodes/edge.cpp @@ -0,0 +1,149 @@ +/**************************************************************************** +** +** 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 + +#include "edge.h" +#include "node.h" + +#include + +static const double Pi = 3.14159265358979323846264338327950288419717; +static double TwoPi = 2.0 * Pi; + +//! [0] +Edge::Edge(Node *sourceNode, Node *destNode) + : arrowSize(10) +{ + setAcceptedMouseButtons(0); + source = sourceNode; + dest = destNode; + source->addEdge(this); + dest->addEdge(this); + adjust(); +} +//! [0] + +//! [1] +Node *Edge::sourceNode() const +{ + return source; +} + +Node *Edge::destNode() const +{ + return dest; +} +//! [1] + +//! [2] +void Edge::adjust() +{ + if (!source || !dest) + return; + + QLineF line(mapFromItem(source, 0, 0), mapFromItem(dest, 0, 0)); + qreal length = line.length(); + + prepareGeometryChange(); + + if (length > qreal(20.)) { + QPointF edgeOffset((line.dx() * 10) / length, (line.dy() * 10) / length); + sourcePoint = line.p1() + edgeOffset; + destPoint = line.p2() - edgeOffset; + } else { + sourcePoint = destPoint = line.p1(); + } +} +//! [2] + +//! [3] +QRectF Edge::boundingRect() const +{ + if (!source || !dest) + return QRectF(); + + qreal penWidth = 1; + qreal extra = (penWidth + arrowSize) / 2.0; + + return QRectF(sourcePoint, QSizeF(destPoint.x() - sourcePoint.x(), + destPoint.y() - sourcePoint.y())) + .normalized() + .adjusted(-extra, -extra, extra, extra); +} +//! [3] + +//! [4] +void Edge::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) +{ + if (!source || !dest) + return; + + QLineF line(sourcePoint, destPoint); + if (qFuzzyCompare(line.length(), qreal(0.))) + return; +//! [4] + +//! [5] + // Draw the line itself + painter->setPen(QPen(Qt::black, 1, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin)); + painter->drawLine(line); +//! [5] + +//! [6] + // Draw the arrows + double angle = ::acos(line.dx() / line.length()); + if (line.dy() >= 0) + angle = TwoPi - angle; + + QPointF sourceArrowP1 = sourcePoint + QPointF(sin(angle + Pi / 3) * arrowSize, + cos(angle + Pi / 3) * arrowSize); + QPointF sourceArrowP2 = sourcePoint + QPointF(sin(angle + Pi - Pi / 3) * arrowSize, + cos(angle + Pi - Pi / 3) * arrowSize); + QPointF destArrowP1 = destPoint + QPointF(sin(angle - Pi / 3) * arrowSize, + cos(angle - Pi / 3) * arrowSize); + QPointF destArrowP2 = destPoint + QPointF(sin(angle - Pi + Pi / 3) * arrowSize, + cos(angle - Pi + Pi / 3) * arrowSize); + + painter->setBrush(Qt::black); + painter->drawPolygon(QPolygonF() << line.p1() << sourceArrowP1 << sourceArrowP2); + painter->drawPolygon(QPolygonF() << line.p2() << destArrowP1 << destArrowP2); +} +//! [6] -- cgit v1.2.3