test_sdk/gui/gtl_gui_chart_series.cpp

#include "gtl_gui_chart_series.h"

namespace gtl
{
    namespace gui
    {
        chart_series::chart_series(gtl::analog_data* ad, chart::axis_horz* axis_x, chart::axis_vert* axis_y)
            : chart::series::xy::line(axis_x, axis_y)
            , _ad(ad)
            , _updater(this)
            , _is_updating(true)
        {
            connect(&_updater, &QThread::finished, this, &chart_series::update_series);
            connect(&_updater, &QThread::finished, this, &chart_series::data_changed);

            if(_ad)
            {
                connect(_ad, &gtl::analog_data::color_changed, this, &chart_series::set_icolor);
                set_icolor();
            }
        }

        chart_series::~chart_series()
        {
            _updater.terminate();
        }

        void chart_series::set_updating(bool value)
        {
            _is_updating = value;
        }

        analog_data *chart_series::ad()
        {
            return _ad;
        }

        QString chart_series::name() const
        {
            if(_ad)
                return _ad->name();

            return "";
        }

        qreal chart_series::left() const
        {
            if(empty())
                return 0;

            return front_x();
        }

        qreal chart_series::right() const
        {
            if(empty())
                return 0;

            return back_x();
        }

        qreal chart_series::get_y(qreal x)
        {
            if(size() < 2)
                return 0;

            qreal x_[2];
            qreal y_[2];
            int idx = 0;

            if(x < front_x())
            {
                idx = 0;
            }
            else if(x > back_x())
            {
                idx = size() - 2;
            }
            else
            {
                qreal dx = at_x(1) - at_x(0);
                idx = (x - at_x(0))/dx;
            }

            x_[0] = at_x(idx);
            x_[1] = at_x(idx + 1);
            y_[0] = at_y(idx);
            y_[1] = at_y(idx + 1);

            qreal a = (y_[0] - y_[1])/(x_[0] - x_[1]);
            qreal b = y_[0] - a*x_[0];

            return a*x + b;
        }

        void chart_series::set_tool_tip(QPoint pos)
        {
            setToolTip("");
        }

        update_thread::update_thread(chart::series::xy::line *s)
            : QThread(NULL)
            , _series(s)
        {

        }

        void update_thread::set_data(std::vector<qreal> &data)
        {
            _mutex.lock();
            _data = data;
            _is_updated = true;
            _mutex.unlock();

            if(!isRunning())
                start();
        }

        void update_thread::get_data(std::back_insert_iterator<std::vector<qreal>> data)
        {
            std::copy(_data.begin(), _data.end(), data);
        }

        void update_thread::stop()
        {
            _is_running = false;
            wait();
        }

        void update_thread::run()
        {
            _is_running = true;
            while(_is_updated)
            {
                _mutex.lock();
                std::vector<qreal> buffer = _data;
                _is_updated = false;
                _mutex.unlock();

                for(int i = 0; i < buffer.size(); i++)
                {
                    _series->set_y(i, buffer[i], false);
                    if(!_is_running)
                        break;
                }
            }
        }

        void chart_series::update_series()
        {
            prepareGeometryChange();
        }

        void chart_series::set_icolor()
        {
            set_color(QColor(_ad->color()));
        }

    }
}