2025-03-10 09:35:07 +00:00
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#include <QHBoxLayout>
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#include <QRandomGenerator>
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#include "centralwidget.h"
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CentralWidget::CentralWidget(QWidget* parent)
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:QWidget(parent),
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_customPlot(new QCustomPlot)
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{
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setStyleSheet("background-color: lightgray;");
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resize(888, 666);
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QHBoxLayout* layout = new QHBoxLayout();
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layout->addWidget(_customPlot);
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this->setLayout(layout);
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//创建画布,设置画布上的点数据
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_customPlot->addGraph();
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#if 0
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// init data
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QVector<double> x(101), y(101);
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for (int i = 0; i < 101; i++) {
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x[i] = i / 50.0 - 1;//设置x的范围为-1~1
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y[i] = x[i] * x[i];
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}
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_customPlot->graph(0)->setData(x, y);
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//设置坐标轴标签
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_customPlot->xAxis->setLabel("x coordinates");
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_customPlot->yAxis->setLabel("y coordinates");
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//设置坐标轴范围，以便我们可以看到全部数据
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_customPlot->xAxis->setRange(0, 1);
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_customPlot->yAxis->setRange(0, 100);
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_customPlot->replot();
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#endif
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startTimer(1000);
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}
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void CentralWidget::timerEvent(QTimerEvent* event)
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{
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//key的单位是秒
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double key = QDateTime::currentDateTime().toMSecsSinceEpoch() / 1000.0;
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//添加数据
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//使用随机数产生一条曲线
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//double value0 = realDataI();
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double value0 = QRandomGenerator::global()->bounded(10.123);
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_customPlot->graph(0)->addData(key, value0);//添加数据到曲线
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//删除8秒之前的数据。这里的8要和下面设置横坐标宽度的8配合起来
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//才能起到想要的效果，可以调整这两个值，观察显示的效果。
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_customPlot->graph(0)->data()->remove(key - 80);
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//自动设定graph(1)曲线y轴的范围，如果不设定，有可能看不到图像
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//也可以用ui->customPlot->yAxis->setRange(up,low)手动设定y轴范围
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_customPlot->graph(0)->rescaleValueAxis(true);
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//这里的8，是指横坐标时间宽度为8秒，如果想要横坐标显示更多的时间
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//就把8调整为比较大到值，比如要显示60秒，那就改成60。
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//这时removeDataBefore(key-8)中的8也要改成60，否则曲线显示不完整。
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_customPlot->yAxis->setRange(0, 20);//设定x轴的范围
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_customPlot->xAxis->setRange(key + 0.25, 80, Qt::AlignRight);//设定x轴的范围
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_customPlot->replot();
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}
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