dynamicsplinewidget.cpp

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++ // Copyright (C) 2023 The Qt Company Ltd.

++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

++

++ #include "dynamicsplinewidget.h"

++

++ #include <QChart>

++ #include <QChartView>

++ #include <QRandomGenerator>

++ #include <QSplineSeries>

++ #include <QValueAxis>

++

++ DynamicSplineWidget::DynamicSplineWidget(QWidget *parent)

++     : ContentWidget(parent)

++ {

++     auto chart = new QChart;

++     chart->setTitle("Dynamic Spline Chart");

++     chart->legend()->hide();

++     chart->setAnimationOptions(QChart::AllAnimations);

++

++     m_axisX = new QValueAxis;

++     m_axisY = new QValueAxis;

++

++     QObject::connect(&m_timer, &QTimer::timeout, this, &DynamicSplineWidget::handleTimeout);

++     m_timer.setInterval(1000);

++

++     m_series = new QSplineSeries;

++     QPen green(Qt::red);

++     green.setWidth(3);

++     m_series->setPen(green);

++     m_series->append(m_x, m_y);

++

++     chart->addSeries(m_series);

++

++     chart->addAxis(m_axisX,Qt::AlignBottom);

++     chart->addAxis(m_axisY,Qt::AlignLeft);

++     m_series->attachAxis(m_axisX);

++     m_series->attachAxis(m_axisY);

++     m_axisX->setTickCount(5);

++     m_axisX->setRange(0, 10);

++     m_axisY->setRange(-5, 10);

++

++     createDefaultChartView(chart);

++

++     m_timer.start();

++ }

++

++ void DynamicSplineWidget::handleTimeout()

++ {

++     qreal x = defaultChartView()->chart()->plotArea().width() / m_axisX->tickCount();

++     qreal y = (m_axisX->max() - m_axisX->min()) / m_axisX->tickCount();

++     m_x += y;

++     m_y = QRandomGenerator::global()->bounded(5) - 2.5;

++     m_series->append(m_x, m_y);

++     defaultChartView()->chart()->scroll(x, 0);

++     if (m_x >= 100)

++         m_timer.stop();

++ }