UPlot.cpp

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// Taken from UtiLite library r186 [www.utilite.googlecode.com]

/*
*  utilite is a cross-platform library with
*  useful utilities for fast and small developing.
*  Copyright (C) 2010  Mathieu Labbe
*
*  utilite is free library: you can redistribute it and/or modify
*  it under the terms of the GNU Lesser General Public License as published by
*  the Free Software Foundation, either version 3 of the License, or
*  (at your option) any later version.
*
*  utilite is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU Lesser General Public License for more details.
*
*  You should have received a copy of the GNU Lesser General Public License
*  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "utilite/UPlot.h"
//#include "utilite/ULogger.h"

#include <QtGui/QGraphicsScene>
#include <QtGui/QGraphicsView>
#include <QtGui/QGraphicsItem>
#include <QtGui/QHBoxLayout>
#include <QtGui/QFormLayout>
#include <QtGui/QResizeEvent>
#include <QtCore/QTime>
#include <QtCore/QTimer>
#include <QtCore/QFileInfo>
#include <QtGui/QPushButton>
#include <QtGui/QToolButton>
#include <QtGui/QLabel>
#include <QtGui/QMenu>
#include <QtGui/QInputDialog>
#include <QtGui/QMessageBox>
#include <QtGui/QFileDialog>
#include <QtGui/QClipboard>
#include <QtGui/QApplication>
#include <QtGui/QPrinter>
#ifdef QT_SVG_LIB
#include <QtSvg/QSvgGenerator>
#endif
#include <cmath>

#define PRINT_DEBUG 0
#define ULOGGER_ERROR(A, ...)
#define ULOGGER_WARN(A, ...)

UPlotItem::UPlotItem(qreal dataX, qreal dataY, qreal width) :
        QGraphicsEllipseItem(0, 0, width, width, 0),
        _previousItem(0),
        _nextItem(0)
{
        _data.setX(dataX);
        _data.setY(dataY);
        this->setZValue(1);
        this->setAcceptsHoverEvents(true);
        _text = new QGraphicsTextItem(this);
        _text->setPlainText(QString("(%1,%2)").arg(_data.x()).arg(_data.y()));
        _text->setVisible(false);
        this->setFlag(QGraphicsItem::ItemIsFocusable, true);
}

UPlotItem::UPlotItem(const QPointF & data, qreal width) :
        QGraphicsEllipseItem(0, 0, width, width, 0),
        _data(data),
        _previousItem(0),
        _nextItem(0)
{
        this->setZValue(1);
        this->setAcceptsHoverEvents(true);
        _text = new QGraphicsTextItem(this);
        _text->setPlainText(QString("(%1,%2)").arg(_data.x()).arg(_data.y()));
        _text->setVisible(false);
        this->setFlag(QGraphicsItem::ItemIsFocusable, true);
}

UPlotItem::~UPlotItem()
{
        if(_previousItem && _nextItem)
        {
                _previousItem->setNextItem(_nextItem);
                _nextItem->setPreviousItem(_previousItem);
        }
        else if(_previousItem)
        {
                _previousItem->setNextItem(0);
        }
        else if(_nextItem)
        {
                _nextItem->setPreviousItem(0);
        }
}

void UPlotItem::setData(const QPointF & data)
{
        _data = data;
}

void UPlotItem::setNextItem(UPlotItem * nextItem)
{
        if(_nextItem != nextItem)
        {
                _nextItem = nextItem;
                if(nextItem)
                {
                        nextItem->setPreviousItem(this);
                }
        }
}

void UPlotItem::setPreviousItem(UPlotItem * previousItem)
{
        if(_previousItem != previousItem)
        {
                _previousItem = previousItem;
                if(previousItem)
                {
                        previousItem->setNextItem(this);
                }
        }
}

void UPlotItem::showDescription(bool shown)
{
        _text->setPlainText(QString("(%1,%2)").arg(_data.x()).arg(_data.y()));
        if(shown)
        {
                this->setPen(QPen(Qt::black, 2));
                if(this->scene())
                {
                        QRectF rect = this->scene()->sceneRect();
                        QPointF p = this->pos();
                        QRectF br = _text->boundingRect();

                        // Make sure the text is always in the scene
                        if(p.x() - br.width() < 0)
                        {
                                p.setX(0);
                        }
                        else if(p.x() + br.width() > rect.width())
                        {
                                p.setX(rect.width() - br.width());
                        }
                        else
                        {
                                p.setX(p.x() - br.width());
                        }

                        if(p.y() - br.height() < 0)
                        {
                                p.setY(0);
                        }
                        else
                        {
                                p.setY(p.y() - br.height());
                        }

                        _text->setPos(this->mapFromScene(p));
                }

                _text->setVisible(true);
        }
        else
        {
                this->setPen(QPen(Qt::black, 1));
                _text->setVisible(false);
        }
}

void UPlotItem::hoverEnterEvent(QGraphicsSceneHoverEvent * event)
{
        QGraphicsScene * scene = this->scene();
        if(scene && scene->focusItem() == 0)
        {
                this->showDescription(true);
        }
        else
        {
                this->setPen(QPen(Qt::black, 2));
        }
        QGraphicsEllipseItem::hoverEnterEvent(event);
}

void UPlotItem::hoverLeaveEvent(QGraphicsSceneHoverEvent * event)
{
        if(!this->hasFocus())
        {
                this->showDescription(false);
        }
        QGraphicsEllipseItem::hoverEnterEvent(event);
}

void UPlotItem::focusInEvent(QFocusEvent * event)
{
        this->showDescription(true);
        QGraphicsEllipseItem::focusInEvent(event);
}

void UPlotItem::focusOutEvent(QFocusEvent * event)
{
        this->showDescription(false);
        QGraphicsEllipseItem::focusOutEvent(event);
}

void UPlotItem::keyReleaseEvent(QKeyEvent * keyEvent)
{
        //Get the next/previous visible item
        if(keyEvent->key() == Qt::Key_Right)
        {
                UPlotItem * next = _nextItem;
                while(next && !next->isVisible())
                {
                        next = next->nextItem();
                }
                if(next && next->isVisible())
                {
                        this->clearFocus();
                        next->setFocus();
                }
        }
        else if(keyEvent->key() == Qt::Key_Left)
        {
                UPlotItem * previous = _previousItem;
                while(previous && !previous->isVisible())
                {
                        previous = previous->previousItem();
                }
                if(previous && previous->isVisible())
                {
                        this->clearFocus();
                        previous->setFocus();
                }
        }
        QGraphicsEllipseItem::keyReleaseEvent(keyEvent);
}





UPlotCurve::UPlotCurve(const QString & name, QObject * parent) :
        QObject(parent),
        _plot(0),
        _name(name),
        _xIncrement(1),
        _xStart(0),
        _visible(true),
        _valuesShown(false)
{
}

UPlotCurve::UPlotCurve(const QString & name, QVector<UPlotItem *> data, QObject * parent) :
        QObject(parent),
        _plot(0),
        _name(name),
        _xIncrement(1),
        _xStart(0),
        _visible(true),
        _valuesShown(false)
{
        this->setData(data);
}

UPlotCurve::UPlotCurve(const QString & name, const QVector<float> & x, const QVector<float> & y, QObject * parent) :
        QObject(parent),
        _plot(0),
        _name(name),
        _xIncrement(1),
        _xStart(0),
        _visible(true),
        _valuesShown(false)
{
        this->setData(x, y);
}

UPlotCurve::~UPlotCurve()
{
        if(_plot)
        {
                _plot->removeCurve(this);
        }
#if PRINT_DEBUG
        ULOGGER_DEBUG("%s", this->name().toStdString().c_str());
#endif
        this->clear();
}

void UPlotCurve::attach(UPlot * plot)
{
        if(!plot || plot == _plot)
        {
                return;
        }
        if(_plot)
        {
                _plot->removeCurve(this);
        }
        _plot = plot;
        for(int i=0; i<_items.size(); ++i)
        {
                _plot->addItem(_items.at(i));
        }
}

void UPlotCurve::detach(UPlot * plot)
{
#if PRINT_DEBUG
        ULOGGER_DEBUG("curve=\"%s\" from plot=\"%s\"", this->objectName().toStdString().c_str(), plot?plot->objectName().toStdString().c_str():"");
#endif
        if(plot && _plot == plot)
        {
                _plot = 0;
                for(int i=0; i<_items.size(); ++i)
                {
                        if(_items.at(i)->scene())
                        {
                                _items.at(i)->scene()->removeItem(_items.at(i));
                        }
                }
        }
}

void UPlotCurve::updateMinMax()
{
        float x,y;
        const UPlotItem * item;
        if(!_items.size())
        {
                _minMax = QVector<float>();
        }
        else
        {
                _minMax = QVector<float>(4);
        }
        for(int i=0; i<_items.size(); ++i)
        {
                item = qgraphicsitem_cast<const UPlotItem *>(_items.at(i));
                if(item)
                {
                        x = item->data().x();
                        y = item->data().y();
                        if(i==0)
                        {
                                _minMax[0] = x;
                                _minMax[1] = x;
                                _minMax[2] = y;
                                _minMax[3] = y;
                        }
                        else
                        {
                                if(x<_minMax[0]) _minMax[0] = x;
                                if(x>_minMax[1]) _minMax[1] = x;
                                if(y<_minMax[2]) _minMax[2] = y;
                                if(y>_minMax[3]) _minMax[3] = y;
                        }
                }
        }
}

void UPlotCurve::_addValue(UPlotItem * data)
{
        // add item
        if(data)
        {
                float x = data->data().x();
                float y = data->data().y();
                if(_minMax.size() != 4)
                {
                        _minMax = QVector<float>(4);
                }
                if(_items.size())
                {
                        data->setPreviousItem((UPlotItem *)_items.last());

                        QGraphicsLineItem * line = new QGraphicsLineItem();
                        line->setPen(_pen);
                        line->setVisible(false);
                        _items.append(line);
                        if(_plot)
                        {
                                _plot->addItem(line);
                        }

                        //Update min/max
                        if(x<_minMax[0]) _minMax[0] = x;
                        if(x>_minMax[1]) _minMax[1] = x;
                        if(y<_minMax[2]) _minMax[2] = y;
                        if(y>_minMax[3]) _minMax[3] = y;
                }
                else
                {
                        _minMax[0] = x;
                        _minMax[1] = x;
                        _minMax[2] = y;
                        _minMax[3] = y;
                }
                _items.append(data);
                data->setVisible(false);
                //data->showDescription(_valuesShown);
                if(_plot)
                {
                        _plot->addItem(_items.last());
                }
        }
        else
        {
                ULOGGER_ERROR("Data is null ?!?");
        }
}

void UPlotCurve::addValue(UPlotItem * data)
{
        // add item
        if(data)
        {
                this->_addValue(data);
                Q_EMIT dataChanged(this);
        }
}

void UPlotCurve::addValue(float x, float y)
{
        float width = 2; // TODO warn : hard coded value!
        this->addValue(new UPlotItem(x,y,width));
}

void UPlotCurve::addValue(float y)
{
        float x = 0;
        if(_items.size())
        {
                UPlotItem * lastItem = (UPlotItem *)_items.last();
                x = lastItem->data().x() + _xIncrement;
        }
        else
        {
                x = _xStart;
        }
        this->addValue(x,y);
}

void UPlotCurve::addValue(const QString & value)
{
        bool ok;
        float v = value.toFloat(&ok);
        if(ok)
        {
                this->addValue(v);
        }
        else
        {
                ULOGGER_ERROR("Value not valid, must be a number, received %s", value.toStdString().c_str());
        }
}

void UPlotCurve::addValues(QVector<UPlotItem *> & data)
{
        for(int i=0; i<data.size(); ++i)
        {
                this->_addValue(data.at(i));
        }
        Q_EMIT dataChanged(this);
}

void UPlotCurve::addValues(const QVector<float> & xs, const QVector<float> & ys)
{
        float width = 2; // TODO warn : hard coded value!
        for(int i=0; i<xs.size() && i<ys.size(); ++i)
        {
                this->_addValue(new UPlotItem(xs.at(i),ys.at(i),width));
        }
        Q_EMIT dataChanged(this);
}

void UPlotCurve::addValues(const QVector<float> & ys)
{
        float x = 0;
        float width = 2; // TODO warn : hard coded value!
        for(int i=0; i<ys.size(); ++i)
        {
                if(_items.size())
                {
                        UPlotItem * lastItem = (UPlotItem *)_items.last();
                        x = lastItem->data().x() + _xIncrement;
                }
                else
                {
                        x = _xStart;
                }
                this->_addValue(new UPlotItem(x,ys.at(i),width));
        }
        Q_EMIT dataChanged(this);
}

void UPlotCurve::addValues(const QVector<int> & ys)
{
        float x = 0;
        float width = 2; // TODO warn : hard coded value!
        for(int i=0; i<ys.size(); ++i)
        {
                if(_items.size())
                {
                        UPlotItem * lastItem = (UPlotItem *)_items.last();
                        x = lastItem->data().x() + _xIncrement;
                }
                else
                {
                        x = _xStart;
                }
                this->_addValue(new UPlotItem(x,ys.at(i),width));
        }
        Q_EMIT dataChanged(this);
}

void UPlotCurve::addValues(const std::vector<int> & ys)
{
        float x = 0;
        float width = 2; // TODO warn : hard coded value!
        for(unsigned int i=0; i<ys.size(); ++i)
        {
                if(_items.size())
                {
                        UPlotItem * lastItem = (UPlotItem *)_items.last();
                        x = lastItem->data().x() + _xIncrement;
                }
                else
                {
                        x = _xStart;
                }
                this->_addValue(new UPlotItem(x,ys.at(i),width));
        }
        Q_EMIT dataChanged(this);
}

void UPlotCurve::addValues(const std::vector<float> & ys)
{
        float x = 0;
        float width = 2; // TODO warn : hard coded value!
        for(unsigned int i=0; i<ys.size(); ++i)
        {
                if(_items.size())
                {
                        UPlotItem * lastItem = (UPlotItem *)_items.last();
                        x = lastItem->data().x() + _xIncrement;
                }
                else
                {
                        x = _xStart;
                }
                this->_addValue(new UPlotItem(x,ys.at(i),width));
        }
        Q_EMIT dataChanged(this);
}

int UPlotCurve::removeItem(int index)
{
        if(index >= 0 && index < _items.size())
        {
                if(index!=0)
                {
                        index-=1;
                        delete _items.takeAt(index); // the line
                }
                else if(_items.size()>1)
                {
                        delete _items.takeAt(index+1); // the line
                }
                UPlotItem * item = (UPlotItem *)_items.takeAt(index); // the plot item
                //Update min/max
                if(_minMax.size() == 4)
                {
                        if(item->data().x() == _minMax[0] || item->data().x() == _minMax[1] ||
                           item->data().y() == _minMax[2] || item->data().y() == _minMax[3])
                        {
                                if(_items.size())
                                {
                                        UPlotItem * tmp = (UPlotItem *)_items.at(0);
                                        float x = tmp->data().x();
                                        float y = tmp->data().y();
                                        _minMax[0]=x;
                                        _minMax[1]=x;
                                        _minMax[2]=y;
                                        _minMax[3]=y;
                                        for(int i = 2; i<_items.size(); i+=2)
                                        {
                                                tmp = (UPlotItem*)_items.at(i);
                                                x = tmp->data().x();
                                                y = tmp->data().y();
                                                if(x<_minMax[0]) _minMax[0] = x;
                                                if(x>_minMax[1]) _minMax[1] = x;
                                                if(y<_minMax[2]) _minMax[2] = y;
                                                if(y>_minMax[3]) _minMax[3] = y;
                                        }
                                }
                                else
                                {
                                        _minMax = QVector<float>();
                                }
                        }
                }
                delete item;
        }

        return index;
}

void UPlotCurve::removeItem(UPlotItem * item) // ownership is transfered to the caller
{
        for(int i=0; i<_items.size(); ++i)
        {
                if(_items.at(i) == item)
                {
                        if(i!=0)
                        {
                                i-=1;
                                delete _items[i];
                                _items.removeAt(i);
                        }
                        else if(_items.size()>1)
                        {
                                delete _items[i+1];
                                _items.removeAt(i+1);
                        }
                        item->scene()->removeItem(item);
                        _items.removeAt(i);
                        break;
                }
        }
}

void UPlotCurve::clear()
{
#if PRINT_DEBUG
        ULOGGER_DEBUG("%s", this->name().toStdString().c_str());
#endif
        qDeleteAll(_items);
        _items.clear();
}

void UPlotCurve::setPen(const QPen & pen)
{
        _pen = pen;
        for(int i=1; i<_items.size(); i+=2)
        {
                ((QGraphicsLineItem*) _items.at(i))->setPen(_pen);
        }
}

void UPlotCurve::setBrush(const QBrush & brush)
{
        _brush = brush;
        ULOGGER_WARN("Not used...");
}

void UPlotCurve::update(float scaleX, float scaleY, float offsetX, float offsetY, float xDir, float yDir, bool allDataKept)
{
        //ULOGGER_DEBUG("scaleX=%f, scaleY=%f, offsetX=%f, offsetY=%f, xDir=%d, yDir=%d, _plot->scene()->width()=%f, _plot->scene()->height=%f", scaleX, scaleY, offsetX, offsetY, xDir, yDir,_plot->scene()->width(),_plot->scene()->height());
        //make sure direction values are 1 or -1
        xDir<0?xDir=-1:xDir=1;
        yDir<0?yDir=-1:yDir=1;

        bool hide = false;
        for(int i=_items.size()-1; i>=0; --i)
        {
                if(i%2 == 0)
                {
                        UPlotItem * item = (UPlotItem *)_items.at(i);
                        if(hide)
                        {
                                if(allDataKept)
                                {
                                        // if not visible, stop looping... all other items are normally already hided
                                        if(!item->isVisible())
                                        {
                                                break;
                                        }
                                        item->setVisible(false);
                                }
                                else
                                {
                                        //remove the item with his line
                                        i = this->removeItem(i);
                                }
                        }
                        else
                        {
                                QPointF newPos(((xDir*item->data().x()+offsetX)*scaleX-item->rect().width()/2.0f),
                                                           ((yDir*item->data().y()+offsetY)*scaleY-item->rect().width()/2.0f));
                                if(!item->isVisible())
                                {
                                        item->setVisible(true);
                                }
                                item->setPos(newPos);
                        }
                }
                else
                {
                        if(hide)
                        {
                                _items.at(i)->setVisible(false);
                        }
                        else
                        {
                                UPlotItem * from = (UPlotItem *)_items.at(i-1);
                                UPlotItem * to = (UPlotItem *)_items.at(i+1);
                                QGraphicsLineItem * lineItem = (QGraphicsLineItem *)_items.at(i);
                                lineItem->setLine((xDir*from->data().x()+offsetX)*scaleX,
                                                                (yDir*from->data().y()+offsetY)*scaleY,
                                                                (xDir*to->data().x()+offsetX)*scaleX,
                                                                (yDir*to->data().y()+offsetY)*scaleY);
                                if(!lineItem->isVisible())
                                {
                                        lineItem->setVisible(true);
                                }
                                //Don't update not visible items
                                // (Detect also if the curve goes forward or backward)
                                QLineF line = lineItem->line();
                                if((line.x1() <= line.x2() && line.x2() < 0-((line.x2() - line.x1()))) ||
                                        (line.x1() > line.x2() && line.x2() > lineItem->scene()->sceneRect().width() + ((line.x1() - line.x2()))))
                                {
                                        hide = true;
                                }

                        }
                }
        }

}

void UPlotCurve::draw(QPainter * painter)
{
        if(painter)
        {
                for(int i=_items.size()-1; i>=0 && _items.at(i)->isVisible(); i-=2)
                {
                        //plotItem
                        const UPlotItem * item = (const UPlotItem *)_items.at(i);
                        int x = (int)item->x();
                        if(x<0)
                        {
                                break;
                        }

                        // draw line in first
                        if(i-1>=0)
                        {
                                painter->save();
                                painter->setPen(this->pen());
                                painter->setBrush(this->brush());
                                //lineItem
                                const QGraphicsLineItem * item = (const QGraphicsLineItem *)_items.at(i-1);
                                QLineF line = item->line();
                                int x = (int)line.p1().x();
                                if(x<0)
                                {
                                        line.setP1(QPoint(0, line.p1().y()));
                                }
                                painter->drawLine(line);
                                painter->restore();
                        }

                        painter->drawEllipse(item->pos()+QPointF(item->rect().width()/2, item->rect().height()/2), (int)item->rect().width()/2, (int)item->rect().height()/2);
                }
        }
}

int UPlotCurve::itemsSize() const
{
        return _items.size();
}

QPointF UPlotCurve::getItemData(int index)
{
        QPointF data;
        //make sure the index point to a PlotItem {PlotItem, line, PlotItem, line...}
        if(index>=0 && index < _items.size() && index % 2 == 0 )
        {
                data = ((UPlotItem*)_items.at(index))->data();
        }
        else
        {
                ULOGGER_ERROR("Wrong index, not pointing on a PlotItem");
        }
        return data;
}

void UPlotCurve::setVisible(bool visible)
{
        _visible = visible;
        for(int i=0; i<_items.size(); ++i)
        {
                _items.at(i)->setVisible(visible);
        }
}

void UPlotCurve::setXIncrement(float increment)
{
        _xIncrement = increment;
}

void UPlotCurve::setXStart(float val)
{
        _xStart = val;
}

void UPlotCurve::setData(QVector<UPlotItem*> & data)
{
        this->clear();
        for(int i = 0; i<data.size(); ++i)
        {
                this->addValue(data[i]);
        }
}

void UPlotCurve::setData(const QVector<float> & x, const QVector<float> & y)
{
        if(x.size() == y.size())
        {
                //match the size of the current data
                int margin = int((_items.size()+1)/2) - x.size();
                while(margin < 0)
                {
                        UPlotItem * newItem = new UPlotItem(0, 0, 2);
                        this->_addValue(newItem);
                        ++margin;
                }
                while(margin > 0)
                {
                        this->removeItem(0);
                        --margin;
                }

                // update values
                int index = 0;
                QVector<float>::const_iterator i=x.begin();
                QVector<float>::const_iterator j=y.begin();
                for(; i!=x.end() && j!=y.end(); ++i, ++j, index+=2)
                {
                        ((UPlotItem*)_items[index])->setData(QPointF(*i, *j));
                }

                //reset minMax, this will force the plot to update the axes
                this->updateMinMax();
                Q_EMIT dataChanged(this);
        }
        else
        {
                ULOGGER_ERROR("Data vectors have not the same size.");
        }
}

void UPlotCurve::setData(const std::vector<float> & x, const std::vector<float> & y)
{
        if(x.size() == y.size())
        {
                //match the size of the current data
                int margin = int((_items.size()+1)/2) - int(x.size());
                while(margin < 0)
                {
                        UPlotItem * newItem = new UPlotItem(0, 0, 2);
                        this->_addValue(newItem);
                        ++margin;
                }
                while(margin > 0)
                {
                        this->removeItem(0);
                        --margin;
                }

                // update values
                int index = 0;
                std::vector<float>::const_iterator i=x.begin();
                std::vector<float>::const_iterator j=y.begin();
                for(; i!=x.end() && j!=y.end(); ++i, ++j, index+=2)
                {
                        ((UPlotItem*)_items[index])->setData(QPointF(*i, *j));
                }

                //reset minMax, this will force the plot to update the axes
                this->updateMinMax();
                Q_EMIT dataChanged(this);
        }
        else
        {
                ULOGGER_ERROR("Data vectors have not the same size.");
        }
}

void UPlotCurve::setData(const QVector<float> & y)
{
        this->setData(y.toStdVector());
}

void UPlotCurve::setData(const std::vector<float> & y)
{
        //match the size of the current data
        int margin = int((_items.size()+1)/2) - int(y.size());
        while(margin < 0)
        {
                UPlotItem * newItem = new UPlotItem(0, 0, 2);
                this->_addValue(newItem);
                ++margin;
        }
        while(margin > 0)
        {
                this->removeItem(0);
                --margin;
        }

        // update values
        int index = 0;
        float x = 0;
        std::vector<float>::const_iterator j=y.begin();
        for(; j!=y.end(); ++j, index+=2)
        {
                ((UPlotItem*)_items[index])->setData(QPointF(x++, *j));
        }

        //reset minMax, this will force the plot to update the axes
        this->updateMinMax();
        Q_EMIT dataChanged(this);
}

void UPlotCurve::getData(QVector<float> & x, QVector<float> & y) const
{
        x.clear();
        y.clear();
        if(_items.size())
        {
                x.resize((_items.size()-1)/2+1);
                y.resize(x.size());
                int j=0;
                for(int i=0; i<_items.size(); i+=2)
                {
                        x[j] = ((UPlotItem*)_items.at(i))->data().x();
                        y[j++] = ((UPlotItem*)_items.at(i))->data().y();
                }
        }
}





UPlotCurveThreshold::UPlotCurveThreshold(const QString & name, float thesholdValue, Qt::Orientation orientation, QObject * parent) :
        UPlotCurve(name, parent),
        _orientation(orientation)
{
        if(_orientation == Qt::Horizontal)
        {
                this->addValue(0, thesholdValue);
                this->addValue(1, thesholdValue);
        }
        else
        {
                this->addValue(thesholdValue, 0);
                this->addValue(thesholdValue, 1);
        }
}

UPlotCurveThreshold::~UPlotCurveThreshold()
{

}

void UPlotCurveThreshold::setThreshold(float threshold)
{
#if PRINT_DEBUG
        ULOGGER_DEBUG("%f", threshold);
#endif
        if(_items.size() == 3)
        {
                UPlotItem * item = 0;
                if(_orientation == Qt::Horizontal)
                {
                        item = (UPlotItem*)_items.at(0);
                        item->setData(QPointF(item->data().x(), threshold));
                        item = (UPlotItem*)_items.at(2);
                        item->setData(QPointF(item->data().x(), threshold));
                }
                else
                {
                        item = (UPlotItem*)_items.at(0);
                        item->setData(QPointF(threshold, item->data().y()));
                        item = (UPlotItem*)_items.at(2);
                        item->setData(QPointF(threshold, item->data().y()));
                }
        }
        else
        {
                ULOGGER_ERROR("A threshold must has only 3 items (1 PlotItem + 1 QGraphicsLineItem + 1 PlotItem)");
        }
}

void UPlotCurveThreshold::setOrientation(Qt::Orientation orientation)
{
        if(_orientation != orientation)
        {
                _orientation = orientation;
                if(_items.size() == 3)
                {
                        UPlotItem * item = 0;
                        item = (UPlotItem*)_items.at(0);
                        item->setData(QPointF(item->data().y(), item->data().x()));
                        item = (UPlotItem*)_items.at(2);
                        item->setData(QPointF(item->data().y(), item->data().x()));
                }
                else
                {
                        ULOGGER_ERROR("A threshold must has only 3 items (1 PlotItem + 1 QGraphicsLineItem + 1 PlotItem)");
                }
        }
}

void UPlotCurveThreshold::update(float scaleX, float scaleY, float offsetX, float offsetY, float xDir, float yDir, bool allDataKept)
{
        if(_items.size() == 3)
        {
                if(_plot)
                {
                        UPlotItem * item = 0;
                        if(_orientation == Qt::Horizontal)
                        {
                                //(xDir*item->data().x()+offsetX)*scaleX
                                item = (UPlotItem*)_items.at(0);
                                item->setData(QPointF(-offsetX/xDir, item->data().y()));
                                item = (UPlotItem*)_items.at(2);
                                item->setData(QPointF( (_plot->sceneRect().width()/scaleX-offsetX)/xDir, item->data().y()));
                        }
                        else
                        {
                                item = (UPlotItem*)_items.at(0);
                                item->setData(QPointF(item->data().x(), -offsetY/yDir));
                                item = (UPlotItem*)_items.at(2);
                                item->setData(QPointF(item->data().x(), (_plot->sceneRect().height()/scaleY-offsetY)/yDir));
                        }
                        this->updateMinMax();
                }
        }
        else
        {
                ULOGGER_ERROR("A threshold must has only 3 items (1 PlotItem + 1 QGraphicsLineItem + 1 PlotItem)");
        }
        UPlotCurve::update(scaleX, scaleY, offsetX, offsetY, xDir, yDir, allDataKept);
}







UPlotAxis::UPlotAxis(Qt::Orientation orientation, float min, float max, QWidget * parent) :
        QWidget(parent),
        _orientation(orientation),
        _reversed(false),
        _gradMaxDigits(4),
        _border(0)
{
        if(_orientation == Qt::Vertical)
        {
                _reversed = true; // default bottom->up
        }
#ifdef WIN32
        this->setMinimumSize(15, 25);
#else
        this->setMinimumSize(15, 25);
#endif
        this->setAxis(min, max); // this initialize all attributes
}

UPlotAxis::~UPlotAxis()
{
#if PRINT_DEBUG
        ULOGGER_DEBUG("");
#endif
}

// Vertical :bottom->up, horizontal :right->left
void UPlotAxis::setReversed(bool reversed)
{
        if(_reversed != reversed)
        {
                float min = _min;
                _min = _max;
                _max = min;
        }
        _reversed = reversed;
}

void UPlotAxis::setAxis(float & min, float & max)
{
        int borderMin = 0;
        int borderMax = 0;
        if(_orientation == Qt::Vertical)
        {
                borderMin = borderMax = this->fontMetrics().height()/2;
        }
        else
        {
                borderMin = this->fontMetrics().width(QString::number(_min,'g',_gradMaxDigits))/2;
                borderMax = this->fontMetrics().width(QString::number(_max,'g',_gradMaxDigits))/2;
        }
        int border = borderMin>borderMax?borderMin:borderMax;
        int borderDelta;
        int length;
        if(_orientation == Qt::Vertical)
        {
                length = (this->height()-border*2);
        }
        else
        {
                length = (this->width()-border*2);
        }

        if(length <= 70)
        {
                _count = 5;
        }
        else if(length <= 175)
        {
                _count = 10;
        }
        else if(length <= 350)
        {
                _count = 20;
        }
        else if(length <= 700)
        {
                _count = 40;
        }
        else if(length <= 1000)
        {
                _count = 60;
        }
        else if(length <= 1300)
        {
                _count = 80;
        }
        else
        {
                _count = 100;
        }

        // Rounding min and max
        if(min != max)
        {
                float mul = 1;
                float rangef = max - min;
                int countStep = _count/5;
                float val;
                for(int i=0; i<6; ++i)
                {
                        val = (rangef/float(countStep)) * mul;
                        if( val >= 1.0f && val < 10.0f)
                        {
                                break;
                        }
                        else if(val<1)
                        {
                                mul *= 10.0f;
                        }
                        else
                        {
                                mul /= 10.0f;
                        }
                }
                //ULOGGER_DEBUG("min=%f, max=%f", min, max);
                int minR = min*mul-0.9;
                int maxR = max*mul+0.9;
                min = float(minR)/mul;
                max = float(maxR)/mul;
                //ULOGGER_DEBUG("mul=%f, minR=%d, maxR=%d,countStep=%d", mul, minR, maxR, countStep);
        }

        _min = min;
        _max = max;

        if(_reversed)
        {
                _min = _max;
                _max = min;
        }

        if(_orientation == Qt::Vertical)
        {
                _step = length/_count;
                borderDelta = length - (_step*_count);
        }
        else
        {
                _step = length/_count;
                borderDelta = length - (_step*_count);
        }

        if(borderDelta%2 != 0)
        {
                borderDelta+=1;
        }

        _border = border + borderDelta/2;

        //Resize estimation
        if(_orientation == Qt::Vertical)
        {
                int minWidth = 0;
                for (int i = 0; i <= _count; i+=5)
                {
                        QString n(QString::number(_min + (i/5)*((_max-_min)/(_count/5)),'g',_gradMaxDigits));
                        if(this->fontMetrics().width(n) > minWidth)
                        {
                                minWidth = this->fontMetrics().width(n);
                        }
                }
                this->setMinimumWidth(15+minWidth);
        }
}

void UPlotAxis::paintEvent(QPaintEvent * event)
{
        QPainter painter(this);
        if(_orientation == Qt::Vertical)
        {
                painter.translate(0, _border);
                for (int i = 0; i <= _count; ++i)
                {
                        if(i%5 == 0)
                        {
                                painter.drawLine(this->width(), 0, this->width()-10, 0);
                                QLabel n(QString::number(_min + (i/5)*((_max-_min)/(_count/5)),'g',_gradMaxDigits));
                                painter.drawText(this->width()-(12+n.sizeHint().width()), n.sizeHint().height()/2-2, n.text());
                        }
                        else
                        {
                                painter.drawLine(this->width(), 0, this->width()-5, 0);
                        }
                        painter.translate(0, _step);
                }
        }
        else
        {
                painter.translate(_border, 0);
                for (int i = 0; i <= _count; ++i)
                {
                        if(i%5 == 0)
                        {
                                painter.drawLine(0, 0, 0, 10);
                                QLabel n(QString::number(_min + (i/5)*((_max-_min)/(_count/5)),'g',_gradMaxDigits));
                                painter.drawText(-(n.sizeHint().width()/2)+1, 22, n.text());
                        }
                        else
                        {
                                painter.drawLine(0, 0, 0, 5);
                        }
                        painter.translate(_step, 0);
                }
        }
}




UPlotLegendItem::UPlotLegendItem(const UPlotCurve * curve, QWidget * parent) :
                QPushButton(parent),
                _curve(curve)
{
        QString nameSpaced = curve->name();
        nameSpaced.replace('_', ' ');
        this->setText(nameSpaced);

        _aChangeText = new QAction(tr("Change text..."), this);
        _aResetText = new QAction(tr("Reset text..."), this);
        _aRemoveCurve = new QAction(tr("Remove this curve"), this);
        _aCopyToClipboard = new QAction(tr("Copy curve data to the clipboard"), this);
        _menu = new QMenu(tr("Curve"), this);
        _menu->addAction(_aChangeText);
        _menu->addAction(_aResetText);
        _menu->addAction(_aRemoveCurve);
        _menu->addAction(_aCopyToClipboard);
}

UPlotLegendItem::~UPlotLegendItem()
{

}
void UPlotLegendItem::contextMenuEvent(QContextMenuEvent * event)
{
        QAction * action = _menu->exec(event->globalPos());
        if(action == _aChangeText)
        {
                bool ok;
                QString text = QInputDialog::getText(this, _aChangeText->text(), tr("Name :"), QLineEdit::Normal, this->text(), &ok);
                if(ok && !text.isEmpty())
                {
                        this->setText(text);
                }
        }
        else if(action == _aResetText)
        {
                if(_curve)
                {
                        this->setText(_curve->name());
                }
        }
        else if(action == _aRemoveCurve)
        {
                Q_EMIT legendItemRemoved(_curve);
        }
        else if (action == _aCopyToClipboard)
        {
                if(_curve)
                {
                        QVector<float> x;
                        QVector<float> y;
                        _curve->getData(x, y);
                        QString textX;
                        QString textY;
                        for(int i=0; i<x.size(); ++i)
                        {
                                textX.append(QString::number(x[i]));
                                textY.append(QString::number(y[i]));
                                if(i+1<x.size())
                                {
                                        textX.append(' ');
                                        textY.append(' ');
                                }
                        }
                        QClipboard * clipboard = QApplication::clipboard();
                        clipboard->setText((textX+"\n")+textY);
                }
        }
}






UPlotLegend::UPlotLegend(QWidget * parent) :
        QWidget(parent),
        _flat(true)
{
        //menu
        _aUseFlatButtons = new QAction(tr("Use flat buttons"), this);
        _aUseFlatButtons->setCheckable(true);
        _aUseFlatButtons->setChecked(_flat);
        _menu = new QMenu(tr("Legend"), this);
        _menu->addAction(_aUseFlatButtons);

        QVBoxLayout * vLayout = new QVBoxLayout(this);
        vLayout->setContentsMargins(0,0,0,0);
        this->setLayout(vLayout);
        vLayout->addStretch(0);
        vLayout->setSpacing(0);
}

UPlotLegend::~UPlotLegend()
{
#if PRINT_DEBUG
        ULOGGER_DEBUG("");
#endif
}

void UPlotLegend::setFlat(bool on)
{
        if(_flat != on)
        {
                _flat = on;
                QList<UPlotLegendItem*> items = this->findChildren<UPlotLegendItem*>();
                for(int i=0; i<items.size(); ++i)
                {
                        items.at(i)->setFlat(_flat);
                        items.at(i)->setChecked(!items.at(i)->isChecked());
                }
                _aUseFlatButtons->setChecked(_flat);
        }
}

void UPlotLegend::addItem(const UPlotCurve * curve)
{
        if(curve)
        {
                UPlotLegendItem * legendItem = new UPlotLegendItem(curve, this);
                legendItem->setAutoDefault(false);
                legendItem->setFlat(_flat);
                legendItem->setCheckable(true);
                legendItem->setChecked(false);
                legendItem->setIcon(QIcon(this->createSymbol(curve->pen(), curve->brush())));
                legendItem->setIconSize(QSize(25,20));
                connect(legendItem, SIGNAL(toggled(bool)), this, SLOT(redirectToggled(bool)));
                connect(legendItem, SIGNAL(legendItemRemoved(const UPlotCurve *)), this, SLOT(removeLegendItem(const UPlotCurve *)));

                // layout
                QHBoxLayout * hLayout = new QHBoxLayout();
                hLayout->addWidget(legendItem);
                hLayout->addStretch(0);
                hLayout->setMargin(0);

                // add to the legend
                ((QVBoxLayout*)this->layout())->insertLayout(this->layout()->count()-1, hLayout);
        }
}

QPixmap UPlotLegend::createSymbol(const QPen & pen, const QBrush & brush)
{
        QPixmap pixmap(50, 50);
        pixmap.fill(Qt::transparent);
        QPainter painter(&pixmap);
        QPen p = pen;
        p.setWidthF(4.0);
        painter.setPen(p);
        painter.drawLine(0.0, 25.0, 50.0, 25.0);
        return pixmap;
}

bool UPlotLegend::remove(const UPlotCurve * curve)
{
        QList<UPlotLegendItem *> items = this->findChildren<UPlotLegendItem*>();
        for(int i=0; i<items.size(); ++i)
        {
                if(items.at(i)->curve() == curve)
                {
                        delete items.at(i);
                        return true;
                }
        }
        return false;
}

void UPlotLegend::removeLegendItem(const UPlotCurve * curve)
{
        if(this->remove(curve))
        {
                Q_EMIT legendItemRemoved(curve);
        }
}

void UPlotLegend::contextMenuEvent(QContextMenuEvent * event)
{
        QAction * action = _menu->exec(event->globalPos());
        if(action == _aUseFlatButtons)
        {
                this->setFlat(_aUseFlatButtons->isChecked());
        }
}

void UPlotLegend::redirectToggled(bool toggled)
{
        if(sender())
        {
                UPlotLegendItem * item = qobject_cast<UPlotLegendItem*>(sender());
                if(item)
                {
                        Q_EMIT legendItemToggled(item->curve(), _flat?!toggled:toggled);
                }
        }
}







UOrientableLabel::UOrientableLabel(const QString & text, Qt::Orientation orientation, QWidget * parent) :
        QLabel(text, parent),
        _orientation(orientation)
{
}

UOrientableLabel::~UOrientableLabel()
{
}

QSize UOrientableLabel::sizeHint() const
{
        QSize size = QLabel::sizeHint();
        if (_orientation == Qt::Vertical)
                size.transpose();
        return size;

}

QSize UOrientableLabel::minimumSizeHint() const
{
        QSize size = QLabel::minimumSizeHint();
        if (_orientation == Qt::Vertical)
                size.transpose();
        return size;
}

void UOrientableLabel::setOrientation(Qt::Orientation orientation)
{
        _orientation = orientation;
        switch(orientation)
        {
        case Qt::Horizontal:
                setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed);
                break;

        case Qt::Vertical:
                setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Minimum);
                break;
        }
}

void UOrientableLabel::paintEvent(QPaintEvent* event)
{
        QPainter p(this);
        QRect r = rect();
        switch (_orientation)
        {
        case Qt::Horizontal:
                break;
        case Qt::Vertical:
                p.rotate(-90);
                p.translate(-height(), 0);
                QSize size = r.size();
                size.transpose();
                r.setSize(size);
                break;
        }
        p.drawText(r, this->alignment() | (this->wordWrap()?Qt::TextWordWrap:0), this->text());
}













UPlot::UPlot(QWidget *parent) :
        QWidget(parent),
        _maxVisibleItems(-1),
        _autoScreenCaptureFormat("png")
{
        this->setupUi();
        this->createActions();
        this->createMenus();

        // This will update actions
        this->showLegend(true);
        this->setGraphicsView(false);
        this->setMaxVisibleItems(0);
        this->showGrid(false);
        this->showRefreshRate(false);
        this->keepAllData(false);

        for(int i=0; i<4; ++i)
        {
                _axisMaximums[i] = 0;
                _axisMaximumsSet[i] = false;
                if(i<2)
                {
                        _fixedAxis[i] = false;
                }
        }

        _refreshIntervalTime.start();
        _lowestRefreshRate = 99;
        _refreshStartTime.start();

        _penStyleCount = rand() % 10 + 1; // rand 1->10
        _workingDirectory = QDir::homePath();
}

UPlot::~UPlot()
{
        _aAutoScreenCapture->setChecked(false);
#if PRINT_DEBUG
        ULOGGER_DEBUG("%s", this->title().toStdString().c_str());
#endif
        this->removeCurves();
}

void UPlot::setupUi()
{
        _legend = new UPlotLegend(this);
        _view = new QGraphicsView(this);
        _view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        _view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        _view->setScene(new QGraphicsScene(0,0,0,0,this));
        _view->setStyleSheet( "QGraphicsView { border-style: none; }" );
        _sceneRoot = _view->scene()->addText("");
        _sceneRoot->translate(0,0);
        _graphicsViewHolder = new QWidget(this);
        _graphicsViewHolder->setMinimumSize(100,100);
        _verticalAxis = new UPlotAxis(Qt::Vertical, 0, 1, this);
        _horizontalAxis = new UPlotAxis(Qt::Horizontal, 0, 1, this);
        _title = new QLabel("");
        _xLabel = new QLabel("");
        _refreshRate = new QLabel("");
        _yLabel = new UOrientableLabel("");
        _yLabel->setOrientation(Qt::Vertical);
        _title->setAlignment(Qt::AlignCenter);
        _xLabel->setAlignment(Qt::AlignCenter);
        _yLabel->setAlignment(Qt::AlignCenter);
        _refreshRate->setAlignment(Qt::AlignCenter);
        _title->setWordWrap(true);
        _xLabel->setWordWrap(true);
        _yLabel->setWordWrap(true);
        _title->setVisible(false);
        _xLabel->setVisible(false);
        _yLabel->setVisible(false);
        _refreshRate->setVisible(false);

        //layouts
        QVBoxLayout * vLayout = new QVBoxLayout(_graphicsViewHolder);
        vLayout->setContentsMargins(0,0,0,0);
        vLayout->addWidget(_view);

        QGridLayout * grid = new QGridLayout(this);
        grid->setContentsMargins(0,0,0,0);
        grid->addWidget(_title, 0, 2);
        grid->addWidget(_yLabel, 1, 0);
        grid->addWidget(_verticalAxis, 1, 1);
        grid->addWidget(_refreshRate, 2, 1);
        grid->addWidget(_graphicsViewHolder, 1, 2);
        grid->setColumnStretch(2, 1);
        grid->setRowStretch(1, 1);
        grid->addWidget(_horizontalAxis, 2, 2);
        grid->addWidget(_xLabel, 3, 2);
        grid->addWidget(_legend, 1, 3);

        connect(_legend, SIGNAL(legendItemToggled(const UPlotCurve *, bool)), this, SLOT(showCurve(const UPlotCurve *, bool)));
        connect(_legend, SIGNAL(legendItemRemoved(const UPlotCurve *)), this, SLOT(removeCurve(const UPlotCurve *)));
}

void UPlot::createActions()
{
        _aShowLegend = new QAction(tr("Show legend"), this);
        _aShowLegend->setCheckable(true);
        _aShowGrid = new QAction(tr("Show grid"), this);
        _aShowGrid->setCheckable(true);
        _aShowRefreshRate = new QAction(tr("Show refresh rate"), this);
        _aShowRefreshRate->setCheckable(true);
        _aGraphicsView = new QAction(tr("Graphics view"), this);
        _aGraphicsView->setCheckable(true);
        _aKeepAllData = new QAction(tr("Keep all data"), this);
        _aKeepAllData->setCheckable(true);
        _aLimit0 = new QAction(tr("No maximum items shown"), this);
        _aLimit10 = new QAction(tr("10"), this);
        _aLimit50 = new QAction(tr("50"), this);
        _aLimit100 = new QAction(tr("100"), this);
        _aLimit500 = new QAction(tr("500"), this);
        _aLimit1000 = new QAction(tr("1000"), this);
        _aLimitCustom = new QAction(tr(""), this);
        _aLimit0->setCheckable(true);
        _aLimit10->setCheckable(true);
        _aLimit50->setCheckable(true);
        _aLimit100->setCheckable(true);
        _aLimit500->setCheckable(true);
        _aLimit1000->setCheckable(true);
        _aLimitCustom->setCheckable(true);
        _aLimitCustom->setVisible(false);
        _aAddVerticalLine = new QAction(tr("Vertical line..."), this);
        _aAddHorizontalLine = new QAction(tr("Horizontal line..."), this);
        _aChangeTitle = new QAction(tr("Change title"), this);
        _aChangeXLabel = new QAction(tr("Change X label..."), this);
        _aChangeYLabel = new QAction(tr("Change Y label..."), this);
        _aYLabelVertical = new QAction(tr("Vertical orientation"), this);
        _aYLabelVertical->setCheckable(true);
        _aYLabelVertical->setChecked(true);
        _aSaveFigure = new QAction(tr("Save figure..."), this);
        _aAutoScreenCapture = new QAction(tr("Auto screen capture..."), this);
        _aAutoScreenCapture->setCheckable(true);
        _aClearData = new QAction(tr("Clear data"), this);

        QActionGroup * grpLimit = new QActionGroup(this);
        grpLimit->addAction(_aLimit0);
        grpLimit->addAction(_aLimit10);
        grpLimit->addAction(_aLimit50);
        grpLimit->addAction(_aLimit100);
        grpLimit->addAction(_aLimit500);
        grpLimit->addAction(_aLimit1000);
        grpLimit->addAction(_aLimitCustom);
        _aLimit0->setChecked(true);
}

void UPlot::createMenus()
{
        _menu = new QMenu(tr("Plot"), this);
        _menu->addAction(_aShowLegend);
        _menu->addAction(_aShowGrid);
        _menu->addAction(_aShowRefreshRate);
        _menu->addAction(_aGraphicsView);
        _menu->addAction(_aKeepAllData);
        _menu->addSeparator()->setStatusTip(tr("Maximum items shown"));
        _menu->addAction(_aLimit0);
        _menu->addAction(_aLimit10);
        _menu->addAction(_aLimit50);
        _menu->addAction(_aLimit100);
        _menu->addAction(_aLimit500);
        _menu->addAction(_aLimit1000);
        _menu->addAction(_aLimitCustom);
        _menu->addSeparator();
        QMenu * addLineMenu = _menu->addMenu(tr("Add line"));
        addLineMenu->addAction(_aAddHorizontalLine);
        addLineMenu->addAction(_aAddVerticalLine);
        _menu->addSeparator();
        _menu->addAction(_aChangeTitle);
        _menu->addAction(_aChangeXLabel);
        QMenu * yLabelMenu = _menu->addMenu(tr("Y label"));
        yLabelMenu->addAction(_aChangeYLabel);
        yLabelMenu->addAction(_aYLabelVertical);
        _menu->addAction(_aSaveFigure);
        _menu->addAction(_aAutoScreenCapture);
        _menu->addSeparator();
        _menu->addAction(_aClearData);

}

UPlotCurve * UPlot::addCurve(const QString & curveName, const QColor & color)
{
        // add curve
        UPlotCurve * curve = new UPlotCurve(curveName, this);
        if(color.isValid())
        {
                curve->setPen(color);
        }
        else
        {
                curve->setPen(this->getRandomPenColored());
        }
        this->addCurve(curve);
        return curve;
}

bool UPlot::addCurve(UPlotCurve * curve, bool ownershipTransferred)
{
        if(curve)
        {
                // only last curve can trigger an update, so disable previous connections
                if(!qobject_cast<UPlotCurveThreshold*>(curve))
                {
                        for(int i=_curves.size()-1; i>=0; --i)
                        {
                                if(!qobject_cast<UPlotCurveThreshold*>(_curves.at(i)))
                                {
                                        disconnect(_curves.at(i), SIGNAL(dataChanged(const UPlotCurve *)), this, SLOT(updateAxis()));
                                        break;
                                }
                        }
                }

                // add curve
                _curves.append(curve);
                curve->attach(this);
                if(ownershipTransferred)
                {
                        curve->setParent(this);
                }
                this->updateAxis(curve);
                curve->setXStart(_axisMaximums[1]);

                connect(curve, SIGNAL(dataChanged(const UPlotCurve *)), this, SLOT(updateAxis()));

                _legend->addItem(curve);

#if PRINT_DEBUG
                ULOGGER_DEBUG("Curve \"%s\" added to plot \"%s\"", curve->name().toStdString().c_str(), this->title().toStdString().c_str());
#endif

                return true;
        }
        else
        {
                ULOGGER_ERROR("The curve is null!");
        }
        return false;
}

QStringList UPlot::curveNames()
{
        QStringList names;
        for(QList<UPlotCurve*>::iterator iter = _curves.begin(); iter!=_curves.end(); ++iter)
        {
                if(*iter)
                {
                        names.append((*iter)->name());
                }
        }
        return names;
}

bool UPlot::contains(const QString & curveName)
{
        for(QList<UPlotCurve*>::iterator iter = _curves.begin(); iter!=_curves.end(); ++iter)
        {
                if(*iter && (*iter)->name().compare(curveName) == 0)
                {
                        return true;
                }
        }
        return false;
}

QPen UPlot::getRandomPenColored()
{
        return QPen((Qt::GlobalColor)(_penStyleCount++ % 12 + 7 ));
}

void UPlot::replot(QPainter * painter)
{
        if(_maxVisibleItems>0)
        {
                UPlotCurve * c = 0;
                int maxItem = 0;
                // find the curve with the most items
                for(QList<UPlotCurve *>::iterator i=_curves.begin(); i!=_curves.end(); ++i)
                {
                        if((*i)->isVisible() && ((UPlotCurve *)(*i))->itemsSize() > maxItem)
                        {
                                c = *i;
                                maxItem = c->itemsSize();
                        }
                }
                if(c && (maxItem-1)/2+1 > _maxVisibleItems)
                {
                        _axisMaximums[0] = c->getItemData((c->itemsSize()-1) -_maxVisibleItems*2).x();
                }
        }

        float axis[4] = {0};
        for(int i=0; i<4; ++i)
        {
                axis[i] = _axisMaximums[i];
        }

        _verticalAxis->setAxis(axis[2], axis[3]);
        _horizontalAxis->setAxis(axis[0], axis[1]);
        if(_aGraphicsView->isChecked() && !painter)
        {
                _verticalAxis->update();
                _horizontalAxis->update();
        }

        //ULOGGER_DEBUG("x1=%f, x2=%f, y1=%f, y2=%f", _axisMaximums[0], _axisMaximums[1], _axisMaximums[2], _axisMaximums[3]);

        QRectF newRect(0,0, _graphicsViewHolder->size().width(), _graphicsViewHolder->size().height());
        _view->scene()->setSceneRect(newRect);
        float borderHor = (float)_horizontalAxis->border();
        float borderVer = (float)_verticalAxis->border();

        //grid
        qDeleteAll(hGridLines);
        hGridLines.clear();
        qDeleteAll(vGridLines);
        vGridLines.clear();
        if(_aShowGrid->isChecked())
        {
                // TODO make a PlotGrid class ?
                float w = newRect.width()-(borderHor*2);
                float h = newRect.height()-(borderVer*2);
                float stepH = w / float(_horizontalAxis->count());
                float stepV = h / float(_verticalAxis->count());
                QPen pen(Qt::DashLine);
                for(float i=0.0f; i*stepV <= h+stepV; i+=5.0f)
                {
                        //horizontal lines
                        if(!_aGraphicsView->isChecked())
                        {
                                if(painter)
                                {
                                        painter->drawLine(0, stepV*i+borderVer+0.5f, borderHor, stepV*i+borderVer+0.5f);
                                        painter->save();
                                        painter->setPen(pen);
                                        painter->drawLine(borderHor, stepV*i+borderVer+0.5f, w+borderHor, stepV*i+borderVer+0.5f);
                                        painter->restore();
                                        painter->drawLine(w+borderHor, stepV*i+borderVer+0.5f, w+borderHor*2, stepV*i+borderVer+0.5f);
                                }
                        }
                        else
                        {
                                hGridLines.append(new QGraphicsLineItem(0, stepV*i+borderVer, borderHor, stepV*i+borderVer, _sceneRoot));
                                hGridLines.append(new QGraphicsLineItem(borderHor, stepV*i+borderVer, w+borderHor, stepV*i+borderVer, _sceneRoot));
                                hGridLines.last()->setPen(pen);
                                hGridLines.append(new QGraphicsLineItem(w+borderHor, stepV*i+borderVer, w+borderHor*2, stepV*i+borderVer, _sceneRoot));
                        }
                }
                for(float i=0; i*stepH < w+stepH; i+=5.0f)
                {
                        //vertical lines
                        if(!_aGraphicsView->isChecked())
                        {
                                if(painter)
                                {
                                        painter->drawLine(stepH*i+borderHor+0.5f, 0, stepH*i+borderHor+0.5f, borderVer);
                                        painter->save();
                                        painter->setPen(pen);
                                        painter->drawLine(stepH*i+borderHor+0.5f, borderVer, stepH*i+borderHor+0.5f, h+borderVer);
                                        painter->restore();
                                        painter->drawLine(stepH*i+borderHor+0.5f, h+borderVer, stepH*i+borderHor+0.5f, h+borderVer*2);
                                }
                        }
                        else
                        {
                                vGridLines.append(new QGraphicsLineItem(stepH*i+borderHor, 0, stepH*i+borderHor, borderVer, _sceneRoot));
                                vGridLines.append(new QGraphicsLineItem(stepH*i+borderHor, borderVer, stepH*i+borderHor, h+borderVer, _sceneRoot));
                                vGridLines.last()->setPen(pen);
                                vGridLines.append(new QGraphicsLineItem(stepH*i+borderHor, h+borderVer, stepH*i+borderHor, h+borderVer*2, _sceneRoot));
                        }
                }
        }

        // curves
        float scaleX = 1;
        float scaleY = 1;
        float den = 0;
        den = axis[1] - axis[0];
        if(den != 0)
        {
                scaleX = (newRect.width()-(borderHor*2)) / den;
        }
        den = axis[3] - axis[2];
        if(den != 0)
        {
                scaleY = (newRect.height()-(borderVer*2)) / den;
        }
        for(QList<UPlotCurve *>::iterator i=_curves.begin(); i!=_curves.end(); ++i)
        {
                if((*i)->isVisible())
                {
                        float xDir = 1.0f;
                        float yDir = -1.0f;
                        (*i)->update(scaleX,
                                                scaleY,
                                                xDir<0?axis[1]+borderHor/scaleX:-(axis[0]-borderHor/scaleX),
                                                yDir<0?axis[3]+borderVer/scaleY:-(axis[2]-borderVer/scaleY),
                                                xDir,
                                                yDir,
                                                _aKeepAllData->isChecked());
                        if(painter)
                        {
                                (*i)->draw(painter);
                        }
                }
        }

        // Update refresh rate
        if(_aShowRefreshRate->isChecked())
        {
                int refreshRate = qRound(1000.0f/float(_refreshIntervalTime.restart()));
                if(refreshRate > 0 && refreshRate < _lowestRefreshRate)
                {
                        _lowestRefreshRate = refreshRate;
                }
                // Refresh the label only after each 1000 ms
                if(_refreshStartTime.elapsed() > 1000)
                {
                        _refreshRate->setText(QString::number(_lowestRefreshRate));
                        _lowestRefreshRate = 99;
                        _refreshStartTime.start();
                }
        }
}

void UPlot::setFixedXAxis(float x1, float x2)
{
        _fixedAxis[0] = true;
        _axisMaximums[0] = x1;
        _axisMaximums[1] = x2;
}

void UPlot::setFixedYAxis(float y1, float y2)
{
        _fixedAxis[1] = true;
        _axisMaximums[2] = y1;
        _axisMaximums[3] = y2;
}

void UPlot::updateAxis(const UPlotCurve * curve)
{
        if(curve && curve->isVisible() && curve->itemsSize() && curve->isMinMaxValid())
        {
                const QVector<float> & minMax = curve->getMinMax();
                //ULOGGER_DEBUG("x1=%f, x2=%f, y1=%f, y2=%f", minMax[0], minMax[1], minMax[2], minMax[3]);
                if(minMax.size() != 4)
                {
                        ULOGGER_ERROR("minMax size != 4 ?!?");
                        return;
                }
                this->updateAxis(minMax[0], minMax[1], minMax[2], minMax[3]);
                _aGraphicsView->isChecked()?this->replot(0):this->update();
        }
}

bool UPlot::updateAxis(float x1, float x2, float y1, float y2)
{
        bool modified = false;
        modified = updateAxis(x1,y1);
        if(!modified)
        {
                modified = updateAxis(x2,y2);
        }
        else
        {
                updateAxis(x2,y2);
        }
        return modified;
}

bool UPlot::updateAxis(float x, float y)
{
        //ULOGGER_DEBUG("x=%f, y=%f", x,y);
        bool modified = false;
        if(!_fixedAxis[0] && (!_axisMaximumsSet[0] || x < _axisMaximums[0]))
        {
                _axisMaximums[0] = x;
                _axisMaximumsSet[0] = true;
                modified = true;
        }

        if(!_fixedAxis[0] && (!_axisMaximumsSet[1] || x > _axisMaximums[1]))
        {
                _axisMaximums[1] = x;
                _axisMaximumsSet[1] = true;
                modified = true;
        }

        if(!_fixedAxis[1] && (!_axisMaximumsSet[2] || y < _axisMaximums[2]))
        {
                _axisMaximums[2] = y;
                _axisMaximumsSet[2] = true;
                modified = true;
        }

        if(!_fixedAxis[1] && (!_axisMaximumsSet[3] || y > _axisMaximums[3]))
        {
                _axisMaximums[3] = y;
                _axisMaximumsSet[3] = true;
                modified = true;
        }

        return modified;
}

void UPlot::updateAxis()
{
        //Reset the axis
        for(int i=0; i<4; ++i)
        {
                if((!_fixedAxis[0] && i<2) || (!_fixedAxis[1] && i>=2))
                {
                        _axisMaximums[i] = 0;
                        _axisMaximumsSet[i] = false;
                }
        }

        for(int i=0; i<_curves.size(); ++i)
        {
                if(_curves.at(i)->isVisible() && _curves.at(i)->isMinMaxValid())
                {
                        const QVector<float> & minMax = _curves.at(i)->getMinMax();
                        this->updateAxis(minMax[0], minMax[1], minMax[2], minMax[3]);
                }
        }

        _aGraphicsView->isChecked()?this->replot(0):this->update();

        this->captureScreen();
}

void UPlot::paintEvent(QPaintEvent * event)
{
#if PRINT_DEBUG
        UDEBUG("");
#endif
        if(!_aGraphicsView->isChecked())
        {
                QPainter painter(this);
                painter.translate(_graphicsViewHolder->pos());
                painter.save();
                painter.setBrush(Qt::white);
                painter.setPen(QPen(Qt::NoPen));
                painter.drawRect(_graphicsViewHolder->rect());
                painter.restore();

                this->replot(&painter);
        }
        else
        {
                QWidget::paintEvent(event);
        }
}

void UPlot::resizeEvent(QResizeEvent * event)
{
        if(_aGraphicsView->isChecked())
        {
                this->replot(0);
        }
        QWidget::resizeEvent(event);
}

void UPlot::contextMenuEvent(QContextMenuEvent * event)
{
        QAction * action = _menu->exec(event->globalPos());

        if(!action)
        {
                return;
        }
        else if(action == _aShowLegend)
        {
                this->showLegend(_aShowLegend->isChecked());
        }
        else if(action == _aShowGrid)
        {
                this->showGrid(_aShowGrid->isChecked());
        }
        else if(action == _aShowRefreshRate)
        {
                this->showRefreshRate(_aShowRefreshRate->isChecked());
        }
        else if(action == _aGraphicsView)
        {
                this->setGraphicsView(_aGraphicsView->isChecked());
        }
        else if(action == _aKeepAllData)
        {
                this->keepAllData(_aKeepAllData->isChecked());
        }
        else if(action == _aLimit0 ||
                        action == _aLimit10 ||
                        action == _aLimit50 ||
                        action == _aLimit100 ||
                        action == _aLimit500 ||
                        action == _aLimit1000 ||
                        action == _aLimitCustom)
        {
                this->setMaxVisibleItems(action->text().toInt());
        }
        else if(action == _aAddVerticalLine || action == _aAddHorizontalLine)
        {
                bool ok;
                QString text = QInputDialog::getText(this, action->text(), tr("New line name :"), QLineEdit::Normal, "", &ok);
                while(ok && text.isEmpty())
                {
                        QMessageBox::warning(this, action->text(), tr("The name is not valid or it is already used in this plot."));
                        text = QInputDialog::getText(this, action->text(), tr("New line name :"), QLineEdit::Normal, "", &ok);
                }
                if(ok)
                {
                        double min = _axisMaximums[2];
                        double max = _axisMaximums[3];
                        QString axis = "Y";
                        if(action == _aAddVerticalLine)
                        {
                                min = _axisMaximums[0];
                                max = _axisMaximums[1];
                                axis = "X";
                        }
                        double value = QInputDialog::getDouble(this,
                                        action->text(),
                                        tr("%1 value (min=%2, max=%3):").arg(axis).arg(min).arg(max),
                                        (min+max)/2,
                                        -2147483647,
                                        2147483647,
                                        4,
                                        &ok);
                        if(ok)
                        {
                                if(action == _aAddHorizontalLine)
                                {
                                        this->addThreshold(text, value, Qt::Horizontal);
                                }
                                else
                                {
                                        this->addThreshold(text, value, Qt::Vertical);
                                }
                        }
                }
        }
        else if(action == _aChangeTitle)
        {
                bool ok;
                QString text = _title->text();
                if(text.isEmpty())
                {
                        text = this->objectName();
                }
                text = QInputDialog::getText(this, _aChangeTitle->text(), tr("Title :"), QLineEdit::Normal, text, &ok);
                if(ok)
                {
                        this->setTitle(text);
                }
        }
        else if(action == _aChangeXLabel)
        {
                bool ok;
                QString text = QInputDialog::getText(this, _aChangeXLabel->text(), tr("X axis label :"), QLineEdit::Normal, _xLabel->text(), &ok);
                if(ok)
                {
                        this->setXLabel(text);
                }
        }
        else if(action == _aChangeYLabel)
        {
                bool ok;
                QString text = QInputDialog::getText(this, _aChangeYLabel->text(), tr("Y axis label :"), QLineEdit::Normal, _yLabel->text(), &ok);
                if(ok)
                {
                        this->setYLabel(text, _yLabel->orientation());
                }
        }
        else if(action == _aYLabelVertical)
        {
                this->setYLabel(_yLabel->text(), _aYLabelVertical->isChecked()?Qt::Vertical:Qt::Horizontal);
        }
        else if(action == _aSaveFigure)
        {

                QString text;
#ifdef QT_SVG_LIB
                text = QFileDialog::getSaveFileName(this, tr("Save figure to ..."), (QDir::homePath() + "/") + this->title() + ".png", "*.png *.xpm *.jpg *.pdf *.svg");
#else
                text = QFileDialog::getSaveFileName(this, tr("Save figure to ..."), (QDir::homePath() + "/") + this->title() + ".png", "*.png *.xpm *.jpg *.pdf");
#endif
                if(!text.isEmpty())
                {
                        bool flatModified = false;
                        if(!_legend->isFlat())
                        {
                                _legend->setFlat(true);
                                flatModified = true;
                        }

                        QPalette p(palette());
                        // Set background color to white
                        QColor c = p.color(QPalette::Background);
                        p.setColor(QPalette::Background, Qt::white);
                        setPalette(p);

#ifdef QT_SVG_LIB
                        if(QFileInfo(text).suffix().compare("svg") == 0)
                        {
                                QSvgGenerator generator;
                                generator.setFileName(text);
                                generator.setSize(this->size());
                                QPainter painter;
                                painter.begin(&generator);
                                this->render(&painter);
                                painter.end();
                        }
                        else
                        {
#endif
                                if(QFileInfo(text).suffix().compare("pdf") == 0)
                                {
                                        QPrinter printer;
                                        printer.setOutputFormat(QPrinter::PdfFormat);
                                        printer.setOutputFileName(text);
                                        this->render(&printer);
                                }
                                else
                                {
                                        QPixmap figure = QPixmap::grabWidget(this);
                                        figure.save(text);
                                }
#ifdef QT_SVG_LIB
                        }
#endif
                        // revert background color
                        p.setColor(QPalette::Background, c);
                        setPalette(p);

                        if(flatModified)
                        {
                                _legend->setFlat(false);
                        }
                }
        }
        else if(action == _aAutoScreenCapture)
        {
                if(_aAutoScreenCapture->isChecked())
                {
                        this->selectScreenCaptureFormat();
                }
        }
        else if(action == _aClearData)
        {
                this->clearData();
        }
        else
        {
                ULOGGER_WARN("Unknown action");
        }
}

void UPlot::setWorkingDirectory(const QString & workingDirectory)
{
        if(QDir(_workingDirectory).exists())
        {
                _workingDirectory = workingDirectory;
        }
        else
        {
                ULOGGER_ERROR("The directory \"%s\" doesn't exist", workingDirectory.toStdString().c_str());
        }
}

void UPlot::captureScreen()
{
        if(!_aAutoScreenCapture->isChecked())
        {
                return;
        }
        QString targetDir = _workingDirectory + "/ScreensCaptured";
        QDir dir;
        if(!dir.exists(targetDir))
        {
                dir.mkdir(targetDir);
        }
        targetDir += "/";
        targetDir += this->title().replace(" ", "_");
        if(!dir.exists(targetDir))
        {
                dir.mkdir(targetDir);
        }
        targetDir += "/";
        QString name = (QDateTime::currentDateTime().toString("yyMMddhhmmsszzz") + ".") + _autoScreenCaptureFormat;
        QPixmap figure = QPixmap::grabWidget(this);
        figure.save(targetDir + name);
}

void UPlot::selectScreenCaptureFormat()
{
        QStringList items;
        items << QString("png") << QString("jpg");
        bool ok;
        QString item = QInputDialog::getItem(this, tr("Select format"), tr("Format:"), items, 0, false, &ok);
        if(ok && !item.isEmpty())
        {
                _autoScreenCaptureFormat = item;
        }
        this->captureScreen();
}

void UPlot::clearData()
{
        for(int i=0; i<_curves.size(); ++i)
        {
                // Don't clear threshold curves
                if(qobject_cast<UPlotCurveThreshold*>(_curves.at(i)) == 0)
                {
                        _curves.at(i)->clear();
                }
        }
        _aGraphicsView->isChecked()?this->replot(0):this->update();
}

// for convenience...
UPlotCurveThreshold * UPlot::addThreshold(const QString & name, float value, Qt::Orientation orientation)
{
        UPlotCurveThreshold * curve = new UPlotCurveThreshold(name, value, orientation, this);
        QPen pen = curve->pen();
        pen.setStyle((Qt::PenStyle)(_penStyleCount++ % 4 + 2));
        curve->setPen(pen);
        if(!this->addCurve(curve))
        {
                if(curve)
                {
                        delete curve;
                }
        }
        else
        {
                _aGraphicsView->isChecked()?this->replot(0):this->update();
        }
        return curve;
}

void UPlot::setTitle(const QString & text)
{
        _title->setText(text);
        _title->setVisible(!text.isEmpty());
        this->update();
        if(_aGraphicsView->isChecked())
        {
                QTimer::singleShot(10, this, SLOT(updateAxis()));
        }
}

void UPlot::setXLabel(const QString & text)
{
        _xLabel->setText(text);
        _xLabel->setVisible(!text.isEmpty());
        this->update();
        if(_aGraphicsView->isChecked())
        {
                QTimer::singleShot(10, this, SLOT(updateAxis()));
        }
}

void UPlot::setYLabel(const QString & text, Qt::Orientation orientation)
{
        _yLabel->setText(text);
        _yLabel->setOrientation(orientation);
        _yLabel->setVisible(!text.isEmpty());
        _aYLabelVertical->setChecked(orientation==Qt::Vertical);
        this->update();
        if(_aGraphicsView->isChecked())
        {
                QTimer::singleShot(10, this, SLOT(updateAxis()));
        }
}

void UPlot::addItem(QGraphicsItem * item)
{
        item->setParentItem(_sceneRoot);
}

void UPlot::showLegend(bool shown)
{
        _legend->setVisible(shown);
        _aShowLegend->setChecked(shown);
        this->update();
        if(_aGraphicsView->isChecked())
        {
                QTimer::singleShot(10, this, SLOT(updateAxis()));
        }
}

void UPlot::showGrid(bool shown)
{
        _aShowGrid->setChecked(shown);
        _aGraphicsView->isChecked()?this->replot(0):this->update();
}

void UPlot::showRefreshRate(bool shown)
{
        _aShowRefreshRate->setChecked(shown);
        _refreshRate->setVisible(shown);
        this->update();
        if(_aGraphicsView->isChecked())
        {
                QTimer::singleShot(10, this, SLOT(updateAxis()));
        }
}

void UPlot::setGraphicsView(bool on)
{
        _aGraphicsView->setChecked(on);
        _view->setVisible(on);
        _aGraphicsView->isChecked()?this->replot(0):this->update();
}

void UPlot::keepAllData(bool kept)
{
        _aKeepAllData->setChecked(kept);
}

void UPlot::setMaxVisibleItems(int maxVisibleItems)
{
        if(maxVisibleItems <= 0)
        {
                _aLimit0->setChecked(true);
        }
        else if(maxVisibleItems == 10)
        {
                _aLimit10->setChecked(true);
        }
        else if(maxVisibleItems == 50)
        {
                _aLimit50->setChecked(true);
        }
        else if(maxVisibleItems == 100)
        {
                _aLimit100->setChecked(true);
        }
        else if(maxVisibleItems == 500)
        {
                _aLimit500->setChecked(true);
        }
        else if(maxVisibleItems == 1000)
        {
                _aLimit1000->setChecked(true);
        }
        else
        {
                _aLimitCustom->setVisible(true);
                _aLimitCustom->setChecked(true);
                _aLimitCustom->setText(QString::number(maxVisibleItems));
        }
        _maxVisibleItems = maxVisibleItems;
        updateAxis();
}

QRectF UPlot::sceneRect() const
{
        return _view->sceneRect();
}

void UPlot::removeCurves()
{
        QList<UPlotCurve*> tmp = _curves;
        for(QList<UPlotCurve*>::iterator iter=tmp.begin(); iter!=tmp.end(); ++iter)
        {
                this->removeCurve(*iter);
        }
        _curves.clear();
}

void UPlot::removeCurve(const UPlotCurve * curve)
{
        QList<UPlotCurve *>::iterator iter = qFind(_curves.begin(), _curves.end(), curve);
#if PRINT_DEBUG
        ULOGGER_DEBUG("Plot=\"%s\" removing curve=\"%s\"", this->objectName().toStdString().c_str(), curve?curve->name().toStdString().c_str():"");
#endif
        if(iter!=_curves.end())
        {
                UPlotCurve * c = *iter;
                c->detach(this);
                _curves.erase(iter);
                _legend->remove(c);
                if(!qobject_cast<UPlotCurveThreshold*>(c))
                {
                        // transfer update connection to next curve
                        for(int i=_curves.size()-1; i>=0; --i)
                        {
                                if(!qobject_cast<UPlotCurveThreshold*>(_curves.at(i)))
                                {
                                        connect(_curves.at(i), SIGNAL(dataChanged(const UPlotCurve *)), this, SLOT(updateAxis()));
                                        break;
                                }
                        }
                }

                if(c->parent() == this)
                {
                        delete c;
                }
                // Update axis
                updateAxis();
        }
}

void UPlot::showCurve(const UPlotCurve * curve, bool shown)
{
        QList<UPlotCurve *>::iterator iter = qFind(_curves.begin(), _curves.end(), curve);
        if(iter!=_curves.end())
        {
                UPlotCurve * value = *iter;
                if(value->isVisible() != shown)
                {
                        value->setVisible(shown);
                        this->updateAxis();
                }
        }
}