newplot.h

#ifndef NEWPLOT_H
#define NEWPLOT_H
 
#include <cmath>
#include <QtGui/QDialog>
#include "qwt_plot.h"
#include <qwt_plot_curve.h>
#include <QTimer>
#include <qwt_plot_grid.h>
#include <qwt_plot_panner.h>
#include <QString> 
#include <algorithm>
 
 
 
 
class newplot : public QwtPlot
{
    Q_OBJECT
 
public:
    newplot(QWidget *parent = 0):m_curve(NULL)
 
    {
        m_time = 0;
        for (int i = 0; i < 1000; i++)
        {
            m_x[i] = 0;
            m_y[i] = 0.0;
 
        }
            this->setTitle("Winch 1");
            this->setAxisTitle(QwtPlot::xBottom, "Time/seconds");
            this->setAxisTitle(QwtPlot::yLeft, "Force [N]");
            //this->axisAutoScale(QwtPlot::yLeft);
 
            this->setAutoReplot(true);
                timeFrame = 10; //default amount of seconds displayed on the x-axis
    }
 
    void appendData( double x, double y){
 
            memmove(m_y, &m_y[1], 999 * sizeof(double));
            memmove(m_x, &m_x[1], 999 * sizeof(double));
 
            m_y[999] = y;
            m_x[999] = x;
    }
 
 
    private slots:
           
 
        void TimeFrame( const QString &mystring)
        {
            timeFrame =mystring.toDouble();
        
        }
 
 
        void draw()
        {
            
            if (!m_curve)
            {
                m_curve = new QwtPlotCurve();
                m_curve->setPen(QPen(QColor::fromRgb(255, 0, 0), 3));
                m_curve->setRawSamples(m_x, m_y, 1000);
                m_curve->attach(this);
            }
 
 
            double max = *(std::max_element(&m_y[0], &m_y[999]));
            double min = *(std::min_element(&m_y[0], &m_y[999]));
 
            //this->setAxisScale(QwtPlot::yLeft, -100, 100);
            this->setAxisScale(QwtPlot::xBottom, m_x[999]-timeFrame, m_x[999]); // auto replots 
            this->setAxisScale(QwtPlot::yLeft, min, max);
            this->replot();
 
 
 
// Grid deactivated because of performance issues
//QwtPlotGrid *grid = new QwtPlotGrid;
//grid->enableXMin(true);
//grid->enableYMin(true);
//grid->setMajPen(QPen(Qt::black, 0, Qt::DotLine));
//grid->setMinPen(QPen(Qt::gray, 0 , Qt::DotLine));
//grid->attach(this);
 
// Plot panner deactivated because of performance issues
//QwtPlotPanner* megaPanner = new QwtPlotPanner(this->canvas());
//megaPanner->setMouseButton(Qt::RightButton);
//megaPanner->setAxisEnabled(QwtPlot::xBottom, false);
 
        }
 
private:
    QwtPlotCurve *m_curve;
    int m_time;
    double m_x[1000];   //time array
    double m_y[1000];   //data array
    double timeFrame;   //displayed time on the x-axis
};
 
#endif // NEWPLOT_H