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Added Qt Elastic Example into NetworkView code.

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works quite well!



git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@392 b45a01b8-16f6-495d-af2f-9b41ad6348cc
This commit is contained in:
drbob 2008-03-20 23:49:12 +00:00
parent 5c75ee5ead
commit 6451e4ebe2
9 changed files with 959 additions and 155 deletions
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218
retroshare-gui/src/gui/elastic/node.cpp Normal file
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/****************************************************************************
**
** Copyright (C) 2006-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file. Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** In addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.0, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** In addition, as a special exception, Trolltech, as the sole copyright
** holder for Qt Designer, grants users of the Qt/Eclipse Integration
** plug-in the right for the Qt/Eclipse Integration to link to
** functionality provided by Qt Designer and its related libraries.
**
** Trolltech reserves all rights not expressly granted herein.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QPainter>
#include <QStyleOption>
#include "edge.h"
#include "node.h"
#include "graphwidget.h"
Node::Node(GraphWidget *graphWidget, uint32_t t, std::string id_in, std::string n)
: graph(graphWidget), ntype(t), id(id_in), name(n),
mDeterminedBB(false)
{
setFlag(ItemIsMovable);
setZValue(1);
}
void Node::addEdge(Edge *edge)
{
edgeList << edge;
edge->adjust();
}
QList<Edge *> Node::edges() const
{
return edgeList;
}
void Node::calculateForces()
{
if (!scene() || scene()->mouseGrabberItem() == this) {
newPos = pos();
return;
}
// Sum up all forces pushing this item away
qreal xvel = 0;
qreal yvel = 0;
foreach (QGraphicsItem *item, scene()->items()) {
Node *node = qgraphicsitem_cast<Node *>(item);
if (!node)
continue;
QLineF line(mapFromItem(node, 0, 0), QPointF(0, 0));
qreal dx = line.dx();
qreal dy = line.dy();
double l = 2.0 * (dx * dx + dy * dy);
if (l > 0) {
xvel += (dx * 150.0) / l;
yvel += (dy * 150.0) / l;
}
}
// Now subtract all forces pulling items together
double weight = (edgeList.size() + 1) * 10;
foreach (Edge *edge, edgeList) {
QPointF pos;
if (edge->sourceNode() == this)
pos = mapFromItem(edge->destNode(), 0, 0);
else
pos = mapFromItem(edge->sourceNode(), 0, 0);
xvel += pos.x() / weight;
yvel += pos.y() / weight;
}
if (qAbs(xvel) < 0.1 && qAbs(yvel) < 0.1)
xvel = yvel = 0;
QRectF sceneRect = scene()->sceneRect();
newPos = pos() + QPointF(xvel, yvel);
newPos.setX(qMin(qMax(newPos.x(), sceneRect.left() + 10), sceneRect.right() - 10));
newPos.setY(qMin(qMax(newPos.y(), sceneRect.top() + 10), sceneRect.bottom() - 10));
}
bool Node::advance()
{
if (newPos == pos())
return false;
setPos(newPos);
return true;
}
QRectF Node::boundingRect() const
{
qreal adjust = 2;
/* add in the size of the text */
qreal realwidth = 40;
if (mDeterminedBB)
{
realwidth = mBBWidth + adjust;
}
if (realwidth < 23 + adjust)
{
realwidth = 23 + adjust;
}
return QRectF(-10 - adjust, -10 - adjust,
realwidth, 23 + adjust);
// 23 + adjust, 23 + adjust);
}
//QPainterPath Node::shape() const
//{
// QPainterPath path;
// path.addEllipse(-10, -10, 20, 20);
// return path;
//}
void Node::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)
{
painter->setPen(Qt::NoPen);
painter->setBrush(Qt::darkGray);
painter->drawEllipse(-7, -7, 20, 20);
QColor col0, col1;
if (ntype == ELASTIC_NODE_TYPE_OWN)
{
col0 = QColor(Qt::yellow);
col1 = QColor(Qt::darkYellow);
}
else if (ntype == ELASTIC_NODE_TYPE_FRIEND)
{
col0 = QColor(Qt::cyan);
col1 = QColor(Qt::blue);
}
else
{
col0 = QColor(Qt::red);
col1 = QColor(Qt::darkRed);
}
QRadialGradient gradient(-3, -3, 10);
if (option->state & QStyle::State_Sunken) {
gradient.setCenter(3, 3);
gradient.setFocalPoint(3, 3);
gradient.setColorAt(1, col0.light(120));
gradient.setColorAt(0, col1.light(120));
} else {
gradient.setColorAt(0, col0);
gradient.setColorAt(1, col1);
}
painter->setBrush(gradient);
painter->setPen(QPen(Qt::black, 0));
painter->drawEllipse(-10, -10, 20, 20);
painter->drawText(-10, 0, QString::fromStdString(name));
if (!mDeterminedBB)
{
QRect textBox = painter->boundingRect(-10, 0, 400, 20, 0, QString::fromStdString(name));
mBBWidth = textBox.width();
mDeterminedBB = true;
}
}
QVariant Node::itemChange(GraphicsItemChange change, const QVariant &value)
{
switch (change) {
case ItemPositionHasChanged:
foreach (Edge *edge, edgeList)
edge->adjust();
graph->itemMoved();
break;
default:
break;
};
return QGraphicsItem::itemChange(change, value);
}
void Node::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
update();
QGraphicsItem::mousePressEvent(event);
}
void Node::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
update();
QGraphicsItem::mouseReleaseEvent(event);
}