datastreamplot.h

/********************************************************************************
 *  FARSA DataStreamPlot UI                                                     *
 *  Copyright (C) 2012-2013                                                     *
 *  Gianluca Massera <emmegian@yahoo.it>                                        *
 *                                                                              *
 *  This program is free software; you can redistribute it and/or modify        *
 *  it under the terms of the GNU General Public License as published by        *
 *  the Free Software Foundation; either version 2 of the License, or           *
 *  (at your option) any later version.                                         *
 *                                                                              *
 *  This program 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 General Public License for more details.                                *
 *                                                                              *
 *  You should have received a copy of the GNU General Public License           *
 *  along with this program; if not, write to the Free Software                 *
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA  *
 ********************************************************************************/

#ifndef DATASTREAMPLOT_H
#define DATASTREAMPLOT_H

#include "qwt/qwt_plot.h"
#include "utilitiesconfig.h"
#include <QColor>
#include <QList>
#include <QMutex>

class QwtPlotCurve;
class QwtPlotDirectPainter;

namespace farsa {

class FARSA_UTIL_API DataStreamPlot : public QwtPlot {
    Q_OBJECT
public:
    DataStreamPlot( QWidget* parent = 0 );
    virtual ~DataStreamPlot();
    int addDataStream( QString name );
    void setDataStreamColor( int streamID, QColor color );
    void appendData( int streamID, float value );
public slots:
    void updatePlot();
private slots:
    // react on the check/uncheck of an item on the legend
    void legendChecked( const QVariant& item, bool on );
private:
    // show/hide the curve (this is called by legendChecked)
    void showCurve( QwtPlotItem* curve, bool on );

    // the data streams to plot
    QList<QwtPlotCurve*> streams;
    // direct painter for incremental drawing of points
    QwtPlotDirectPainter* directPainter;
    // the min y value added so far
    float minY;
    // the max y value added so far
    float maxY;
    // the max value on the x scale (corresponding to the number of value added from start)
    float maxX;
    // dimension of the window of data to show
    float windowSize;
};

} // end namespace farsa

#endif