//
// Created by zong on 6/10/22.
//

// You may need to build the project (run Qt uic code generator) to get "ui_gchartview.h" resolved

#include "GChartView.h"


GChartView::GChartView(QWidget *parent) : QChartView(parent) {
    data = new QLineSeries();
    axis_x = new QValueAxis();
    axis_y = new QValueAxis();
    chart = new QChart();
    chart->setTitle("WIP");
    axis_x->setRange(0, 5);
    axis_y->setRange(-2.6, 2.6);
//    axis_x->setTickType(QValueAxis::TickType::TicksDynamic);
    axis_x->setTickInterval(1);
    axis_x->setLabelFormat("%d");
//    axis_y->setTickCount(21);
    chart->addAxis(axis_x, Qt::AlignBottom);
    chart->addAxis(axis_y, Qt::AlignLeft);
    chart->addSeries(data);
    this->setChart(chart);
    data->attachAxis(axis_x);
    data->attachAxis(axis_y);
}

GChartView::~GChartView() {
}

void GChartView::wheelEvent(QWheelEvent *event) {
    auto degrees = event->angleDelta();
    auto cursor_y = event->position().y();
    auto cur_range_max = axis_y->max();
    auto cur_range_min = axis_y->min();

    // left and top corner is origin
    auto pos_max = chart->mapToPosition(QPointF(0, cur_range_min)).y();
    auto pos_min = chart->mapToPosition(QPointF(0, cur_range_max)).y();
    auto new_range = 5.0;
    auto center = (qreal) 0.0;
    if (cursor_y < pos_max && cursor_y > pos_min) {
        center = chart->mapToValue(QPointF(0, cursor_y)).y();
        auto cur_range = (cur_range_max - cur_range_min);
        if (degrees.y() > 0)
            new_range = cur_range * 0.8;
        else
            new_range = cur_range / 0.8;
    }
    // setup new axis
    auto new_max = (center + new_range / 2.0);
    auto new_min = (center - new_range / 2.0);
    if (new_max > 2.5) {
        new_min -= (new_max - 2.5);
        new_max = 2.5;
    }
    if (new_min < -2.5) {
        new_max += (-2.5 - new_min);
        new_min = -2.5;
        new_max = new_max > 2.5 ? 2.5 : new_max;
    }

    axis_y->setRange(new_min, new_max);
    qDebug() << "new_min:  " << new_min << " " << new_max;


}

void GChartView::append(qreal x, qreal y) {
    data->append(x, y);
//    while (data->count() > 5000) {
//        data->remove(0);
//    }
//    qDebug() << x << y;
//    auto beg = data->at(0);
    auto end = data->at(data->count()-1);
    if (end.x() > 5) {
        axis_x->setRange(end.x()-5, end.x());
    }

}