84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
//
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// Created by zong on 6/10/22.
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//
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// You may need to build the project (run Qt uic code generator) to get "ui_gchartview.h" resolved
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#include "GChartView.h"
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GChartView::GChartView(QWidget *parent) : QChartView(parent) {
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data = new QLineSeries();
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axis_x = new QValueAxis();
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axis_y = new QValueAxis();
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chart = new QChart();
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chart->setTitle("WIP");
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axis_x->setRange(0, 5);
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axis_y->setRange(-2.6, 2.6);
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// axis_x->setTickType(QValueAxis::TickType::TicksDynamic);
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axis_x->setTickInterval(1);
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axis_x->setLabelFormat("%d");
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// axis_y->setTickCount(21);
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chart->addAxis(axis_x, Qt::AlignBottom);
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chart->addAxis(axis_y, Qt::AlignLeft);
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chart->addSeries(data);
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this->setChart(chart);
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data->attachAxis(axis_x);
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data->attachAxis(axis_y);
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}
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GChartView::~GChartView() {
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}
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void GChartView::wheelEvent(QWheelEvent *event) {
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auto degrees = event->angleDelta();
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auto cursor_y = event->position().y();
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auto cur_range_max = axis_y->max();
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auto cur_range_min = axis_y->min();
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// left and top corner is origin
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auto pos_max = chart->mapToPosition(QPointF(0, cur_range_min)).y();
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auto pos_min = chart->mapToPosition(QPointF(0, cur_range_max)).y();
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auto new_range = 5.0;
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auto center = (qreal) 0.0;
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if (cursor_y < pos_max && cursor_y > pos_min) {
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center = chart->mapToValue(QPointF(0, cursor_y)).y();
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auto cur_range = (cur_range_max - cur_range_min);
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if (degrees.y() > 0)
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new_range = cur_range * 0.8;
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else
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new_range = cur_range / 0.8;
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}
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// setup new axis
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auto new_max = (center + new_range / 2.0);
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auto new_min = (center - new_range / 2.0);
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if (new_max > 2.5) {
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new_min -= (new_max - 2.5);
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new_max = 2.5;
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}
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if (new_min < -2.5) {
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new_max += (-2.5 - new_min);
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new_min = -2.5;
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new_max = new_max > 2.5 ? 2.5 : new_max;
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}
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axis_y->setRange(new_min, new_max);
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qDebug() << "new_min: " << new_min << " " << new_max;
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}
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void GChartView::append(qreal x, qreal y) {
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data->append(x, y);
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// while (data->count() > 5000) {
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// data->remove(0);
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// }
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// qDebug() << x << y;
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// auto beg = data->at(0);
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auto end = data->at(data->count()-1);
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if (end.x() > 5) {
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axis_x->setRange(end.x()-5, end.x());
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}
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}
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