/*

  This file is part of serialplot.

  serialplot 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 3 of the License, or

  (at your option) any later version.

  serialplot 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 serialplot.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "zoomer.h"

#include <qwt_plot.h>

#include <QPen>

#include <QMouseEvent>

#include <QtMath>

static const int VALUE_POINT_DIAM = 4;

static const int VALUE_TEXT_MARGIN = VALUE_POINT_DIAM + 2;

Zoomer::Zoomer(QWidget* widget, bool doReplot) :

    ScrollZoomer(widget)

{

    is_panning = false;

    setTrackerMode(AlwaysOn);

    // set corner widget between the scrollbars with default background color

    auto cornerWidget = new QWidget();

    auto bgColor = cornerWidget->palette().color(QPalette::Window).name();

    auto styleSheet = QString("background-color:%1;").arg(bgColor);

    cornerWidget->setStyleSheet(styleSheet);

    ScrollZoomer::setCornerWidget(cornerWidget);

}

void Zoomer::zoom(int up)

{

    ScrollZoomer::zoom(up);

    if(zoomRectIndex() == 0)

    {

        emit unzoomed();

    const QRectF rect = invTransform(QRect(pa.first(), pa.last()).normalized());

    QString sizeText = QString(" [%1, %2]").\

        arg(rect.width(), 0, 'g', 4).\

        arg(rect.height(), 0, 'g', 4);

    b.setText(b.text() + sizeText);

    return b;

}

void Zoomer::drawRubberBand(QPainter* painter) const

{

    const double FILL_ALPHA = 0.2;

    QColor color = painter->pen().color();

    color.setAlphaF(FILL_ALPHA);

    painter->setBrush(color);

    ScrollZoomer::drawRubberBand(painter);

}

QRegion Zoomer::rubberBandMask() const

{

    const QPolygon pa = selection();

    if (pa.count() < 2)

    {

        return QRegion();

    }

    const QRect r = QRect(pa.first(), pa.last()).normalized().adjusted(0, 0, 1, 1);

    return QRegion(r);

}

void Zoomer::drawTracker(QPainter* painter) const

{

    if (isActive())

    {

        QwtPlotZoomer::drawTracker(painter);

    }

    else if (dispChannels.length())

    {

        drawValues(painter);

    }

}

void Zoomer::drawValues(QPainter* painter) const

{

    painter->save();

    auto values = findValues(x);

    // draw vertical line

    auto linePen = rubberBandPen();

    linePen.setStyle(Qt::DotLine);

    painter->setPen(linePen);

    const QRect pRect = pickArea().boundingRect().toRect();

    painter->drawLine(px, pRect.top(), px, pRect.bottom());

    // draw sample values

    for (int ci = 0; ci < values.size(); ci++)

    {

        if (!dispChannels[ci]->visible()) continue;

        double val = values[ci];

        if (!std::isnan(val))

        {

            auto p = transform(QPointF(x, val));

            painter->setBrush(dispChannels[ci]->color());

            painter->setPen(Qt::NoPen);

            painter->drawEllipse(p, VALUE_POINT_DIAM, VALUE_POINT_DIAM);

            painter->setPen(rubberBandPen());

            // We give a very small (1x1) rectangle but disable clipping

            painter->drawText(QRectF(p.x() + VALUE_TEXT_MARGIN, p.y(), 1, 1),

                              Qt::AlignVCenter | Qt::TextDontClip,

                              QString("%1").arg(val));

        }

    }

    painter->restore();

}

QVector<double> Zoomer::findValues(double x) const

{

    unsigned nc = dispChannels.length();

    QVector<double> result(nc);

    for (unsigned ci = 0; ci < nc; ci++)

    {

        if (dispChannels[ci]->visible())

        {

            result[ci] = dispChannels[ci]->findValue(x);

        }

    }

    return result;

}

QRect Zoomer::trackerRect(const QFont& font) const

{

    if (isActive())

    {

        return QwtPlotZoomer::trackerRect(font);

    }