mirror of
https://github.com/RetroShare/RetroShare.git
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373 lines
9.6 KiB
C++
373 lines
9.6 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Qt Software Information (qt-info@nokia.com)
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**
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** This file is part of the example classes of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial Usage
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Nokia.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain
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** additional rights. These rights are described in the Nokia Qt LGPL
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** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
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** package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** If you are unsure which license is appropriate for your use, please
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** contact the sales department at qt-sales@nokia.com.
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "graphwidget.h"
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#include "edge.h"
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#include "node.h"
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#include "fft.h"
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#include <iostream>
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#include <QDebug>
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#include <QGraphicsScene>
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#include <QWheelEvent>
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#include <math.h>
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GraphWidget::GraphWidget(QWidget *)
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: timerId(0), mIsFrozen(false)
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{
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setCacheMode(CacheBackground);
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setViewportUpdateMode(BoundingRectViewportUpdate);
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setRenderHint(QPainter::Antialiasing);
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setTransformationAnchor(AnchorUnderMouse);
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setResizeAnchor(AnchorViewCenter);
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_friction_factor = 1.0f ;
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scale(qreal(0.8), qreal(0.8));
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}
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void GraphWidget::clearGraph()
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{
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scene()->clear();
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scene()->setSceneRect(0, 0, width(), height());
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_edges.clear();
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_nodes.clear();
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_friction_factor = 1.0f ;
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}
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GraphWidget::NodeId GraphWidget::addNode(const std::string& node_short_string,const std::string& node_complete_string,NodeType type,AuthType auth,const RsPeerId& ssl_id,const RsPgpId& gpg_id)
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{
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Node *node = new Node(node_short_string,type,auth,this,ssl_id,gpg_id);
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node->setToolTip(QString::fromUtf8(node_complete_string.c_str())) ;
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_nodes.push_back(node) ;
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scene()->addItem(node);
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std::map<std::string,QPointF>::const_iterator it(_node_cached_positions.find(gpg_id.toStdString())) ;
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if(_node_cached_positions.end() != it)
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node->setPos(it->second) ;
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else
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{
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qreal x1,y1,x2,y2 ;
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sceneRect().getCoords(&x1,&y1,&x2,&y2) ;
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float f1 = (type == GraphWidget::ELASTIC_NODE_TYPE_OWN)?0.5:(rand()/(float)RAND_MAX) ;
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float f2 = (type == GraphWidget::ELASTIC_NODE_TYPE_OWN)?0.5:(rand()/(float)RAND_MAX) ;
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node->setPos(x1+f1*(x2-x1),y1+f2*(y2-y1));
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}
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#ifdef DEBUG_ELASTIC
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std::cerr << "Added node " << _nodes.size()-1 << std::endl ;
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#endif
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return _nodes.size()-1 ;
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}
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void GraphWidget::snapshotNodesPositions()
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{
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for(uint32_t i=0;i<_nodes.size();++i)
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_node_cached_positions[_nodes[i]->idString()] = _nodes[i]->mapToScene(QPointF(0,0)) ;
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}
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void GraphWidget::clearNodesPositions()
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{
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_node_cached_positions.clear() ;
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}
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GraphWidget::EdgeId GraphWidget::addEdge(NodeId n1,NodeId n2)
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{
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std::pair<NodeId,NodeId> ed(std::min(n1,n2),std::max(n1,n2)) ;
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if( _edges.find(ed) == _edges.end() )
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{
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Edge *edge = new Edge(_nodes[n1],_nodes[n2]);
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scene()->addItem(edge);
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_edges[ed] = edge ;
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#ifdef DEBUG_ELASTIC
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std::cerr << "Added edge " << n1 << " - " << n2 << std::endl ;
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#endif
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}
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return 0 ;
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}
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void GraphWidget::itemMoved()
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{
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if (!timerId)
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{
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#ifdef DEBUG_ELASTIC
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std::cout << "starting timer" << std::endl;
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#endif
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timerId = startTimer(1000 / 25); // hit timer 25 times per second.
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_friction_factor = 1.0f ;
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}
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}
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void GraphWidget::keyPressEvent(QKeyEvent *event)
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{
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switch (event->key()) {
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case Qt::Key_Plus:
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scaleView(qreal(1.2));
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break;
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case Qt::Key_Minus:
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scaleView(1 / qreal(1.2));
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break;
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case Qt::Key_Space:
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case Qt::Key_Enter:
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foreach (QGraphicsItem *item, scene()->items()) {
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if (qgraphicsitem_cast<Node *>(item))
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item->setPos(-150 + qrand() % 300, -150 + qrand() % 300);
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}
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break;
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default:
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QGraphicsView::keyPressEvent(event);
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}
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}
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static void convolveWithForce(double *forceMap,unsigned int S,int /*s*/)
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{
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static double **bf = NULL ;
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static double **tmp = NULL ;
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static int *ip = NULL ;
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static double *w = NULL ;
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static uint32_t last_S = 0 ;
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if(bf == NULL)
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{
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bf = fft::alloc_2d_double(S, 2*S);
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for(unsigned int i=0;i<S;++i)
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for(unsigned int j=0;j<S;++j)
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{
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int x = (i<S/2)?i:(S-i) ;
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int y = (j<S/2)?j:(S-j) ;
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bf[i][j*2+0] = log(sqrtf(0.1 + x*x+y*y)); // linear -> derivative is constant
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bf[i][j*2+1] = 0 ;
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}
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ip = fft::alloc_1d_int(2 + (int) sqrt(S + 0.5));
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w = fft::alloc_1d_double(S/2+S);
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ip[0] = 0;
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fft::cdft2d(S, 2*S, 1, bf, ip, w);
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}
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if(last_S != S)
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{
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if(tmp)
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fft::free_2d_double(tmp) ;
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tmp = fft::alloc_2d_double(S, 2*S);
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last_S = S ;
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}
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memcpy(tmp[0],forceMap,S*S*2*sizeof(double)) ;
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fft::cdft2d(S, 2*S, 1, tmp, ip, w);
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for (unsigned int i=0;i<S;++i)
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for (unsigned int j=0;j<S;++j)
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{
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float a = tmp[i][2*j+0]*bf[i][2*j+0] - tmp[i][2*j+1]*bf[i][2*j+1] ;
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float b = tmp[i][2*j+0]*bf[i][2*j+1] + tmp[i][2*j+1]*bf[i][2*j+0] ;
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tmp[i][2*j+0] = a ;
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tmp[i][2*j+1] = b ;
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}
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fft::cdft2d(S, 2*S,-1, tmp, ip, w);
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memcpy(forceMap,tmp[0],S*S*2*sizeof(double)) ;
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for(uint32_t i=0;i<2*S*S;++i)
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forceMap[i] /= S*S;
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}
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void GraphWidget::timerEvent(QTimerEvent *event)
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{
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Q_UNUSED(event);
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if(!isVisible())
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return ;
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if (mIsFrozen)
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{
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update();
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return;
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}
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static const int S = 256 ;
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static double *forceMap = new double[2*S*S] ;
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// Update force map only once every 8 hits.
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//
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static uint32_t hit = 0 ;
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QRectF R(scene()->sceneRect()) ;
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if( (hit++ & 3) == 0)
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{
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memset(forceMap,0,2*S*S*sizeof(double)) ;
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foreach (Node *node, _nodes)
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{
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QPointF pos = node->mapToScene(QPointF(0,0)) ;
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float x = S*(pos.x()-R.left())/R.width() ;
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float y = S*(pos.y()- R.top())/R.height() ;
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int i=(int)floor(x) ;
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int j=(int)floor(y) ;
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float di = x-i ;
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float dj = y-j ;
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if( i>=0 && i<S-1 && j>=0 && j<S-1)
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{
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forceMap[2*(i +S*(j ))] += (1-di)*(1-dj) ;
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forceMap[2*(i+1+S*(j ))] += di *(1-dj) ;
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forceMap[2*(i +S*(j+1))] += (1-di)*dj ;
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forceMap[2*(i+1+S*(j+1))] += di *dj ;
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}
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}
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// compute convolution with 1/omega kernel.
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convolveWithForce(forceMap,S,20) ;
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}
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foreach (Node *node, _nodes)
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{
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QPointF pos = node->mapToScene(QPointF(0,0)) ;
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float x = S*(pos.x()-R.left())/R.width() ;
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float y = S*(pos.y()-R.top())/R.height() ;
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node->calculateForces(forceMap,R.width(),R.height(),S,S,x,y,_friction_factor);
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}
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bool itemsMoved = false;
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foreach (Node *node, _nodes)
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if(node->progress())
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itemsMoved = true;
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if (!itemsMoved) {
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killTimer(timerId);
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#ifdef DEBUG_ELASTIC
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std::cerr << "Killing timr" << std::endl ;
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#endif
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timerId = 0;
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}
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_friction_factor *= 1.001f ;
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// std::cerr << "Friction factor = " << _friction_factor << std::endl;
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}
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void GraphWidget::setEdgeLength(uint32_t l)
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{
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_edge_length = l ;
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if(!timerId)
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{
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#ifdef DEBUG_ELASTIC
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std::cout << "starting timer" << std::endl;
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#endif
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timerId = startTimer(1000 / 25);
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_friction_factor = 1.0f ;
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}
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}
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void GraphWidget::setNameSearch(QString s)
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{
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float f = QFontMetrics(font()).height()/16.0 ;
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if (s.length() == 0){
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for(uint32_t i=0;i<_nodes.size();++i)
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_nodes[i]->setNodeDrawSize(12 * f);
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forceRedraw();
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return;
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}
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std::string qs = s.toLower().toStdString();
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for(uint32_t i=0;i<_nodes.size();++i){
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Node* ni = _nodes[i];
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//std::cout << ni->descString() << std::endl;
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std::string ns = QString::fromStdString(ni->descString()).toLower().toStdString();
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if (ns.find(qs) != std::string::npos) {
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//std::cout << "found!" << '\n';
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ni->setNodeDrawSize(22 * f);
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//std::cout << ni->getNodeDrawSize() << '\n';
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} else {
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ni->setNodeDrawSize(12 * f);
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}
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}
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forceRedraw();
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}
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void GraphWidget::forceRedraw()
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{
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for(uint32_t i=0;i<_nodes.size();++i)
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_nodes[i]->update(_nodes[i]->boundingRect()) ;
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}
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void GraphWidget::resizeEvent(QResizeEvent *event)
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{
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scene()->setSceneRect(QRectF(QPointF(0,0),event->size()));
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}
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void GraphWidget::wheelEvent(QWheelEvent *event)
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{
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scaleView(pow((double)2, -event->delta() / 240.0));
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}
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void GraphWidget::scaleView(qreal scaleFactor)
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{
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qreal factor = matrix().scale(scaleFactor, scaleFactor).mapRect(QRectF(0, 0, 1, 1)).width();
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if (factor < 0.07 || factor > 100)
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return;
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scale(scaleFactor, scaleFactor);
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}
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void GraphWidget::setFreeze(bool freeze)
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{
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mIsFrozen = freeze;
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}
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bool GraphWidget::isFrozen() const
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{
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return mIsFrozen;
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}
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