#include <QColor>

#include <qwt_symbol.h>

#include <qwt_plot_curve.h>

#include <math.h>

#include <algorithm>

#include "plot.h"

#include "utils.h"

static const int SYMBOL_SHOW_AT_WIDTH = 5;

static const int SYMBOL_SIZE_MAX = 7;

Plot::Plot(QWidget* parent) :

    QwtPlot(parent),

    zoomer(this->canvas(), false),

    sZoomer(this, &zoomer)

{

    isAutoScaled = true;

    symbolSize = 0;

    QObject::connect(&zoomer, &Zoomer::unzoomed, this, &Plot::unzoomed);

    zoomer.setZoomBase();

    grid.attach(this);

    legend.attach(this);

    showGrid(false);

    darkBackground(false);

    snapshotOverlay = NULL;

    connect(&zoomer, &QwtPlotZoomer::zoomed,

            [this](const QRectF &rect)

            {

                onXScaleChanged();

            });

    connect(this, &QwtPlot::itemAttached,

            [this](QwtPlotItem *plotItem, bool on)

            {

                if (symbolSize) updateSymbols();

            });

    // init demo indicator

    QwtText demoText(" DEMO RUNNING ");  // looks better with spaces

    demoText.setColor(QColor("white"));

    demoText.setBackgroundBrush(Qt::darkRed);

    demoText.setBorderRadius(4);

    demoIndicator.setText(demoText);

    demoIndicator.hide();

    demoIndicator.attach(this);

}

Plot::~Plot()

{

    if (snapshotOverlay != NULL) delete snapshotOverlay;

}

void Plot::setAxis(bool autoScaled, double yAxisMin, double yAxisMax)

{

    this->isAutoScaled = autoScaled;

    if (!autoScaled)

    {

        yMin = yAxisMin;

        yMax = yAxisMax;

    }

    zoomer.zoom(0);

    resetAxes();

}

void Plot::resetAxes()

{

    if (isAutoScaled)

    {

        setAxisAutoScale(QwtPlot::yLeft);

    }

    else

    {

        setAxisScale(QwtPlot::yLeft, yMin, yMax);

    }

    replot();

}

void Plot::unzoomed()

{

    setAxisAutoScale(QwtPlot::xBottom);

    resetAxes();

    onXScaleChanged();

}

void Plot::showGrid(bool show)

{

    grid.enableX(show);