QT实现动态曲线

#include "chart.h"
#include <QtCharts/QAbstractAxis>
#include <QtCharts/QSplineSeries>
#include <QtCharts/QValueAxis>
#include <QtCore/QRandomGenerator>
#include <QtCore/QDebug>

Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags):
QChart(QChart::ChartTypeCartesian, parent, wFlags),
m_series(0),
m_axisX(new QValueAxis()),
m_axisY(new QValueAxis()),
m_step(0),
m_x(5),
m_y(1)
{
QObject::connect(&m_timer, &QTimer::timeout, this, &Chart::handleTimeout);
m_timer.setInterval(1000);

m_series = new QSplineSeries(this);
QPen green(Qt::red);
green.setWidth(3);
m_series->setPen(green);
m_series->append(m_x, m_y);

addSeries(m_series);

addAxis(m_axisX,Qt::AlignBottom);
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);

m_timer.start();
}

Chart::~Chart()
{

}

void Chart::handleTimeout()
{
qreal x = 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);
scroll(x, 0);
if (m_x == 100)
m_timer.stop();
}