126 lines
4.0 KiB
C++
126 lines
4.0 KiB
C++
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#include "CurvePlotWidget.h"
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#include <QVBoxLayout>
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using namespace QtCharts; // 只在 cpp 里用，头文件里不要 using
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// 放在 CurvePlotWidget.cpp 顶部
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static void syncChartFontsAndColors(QChart *chart, const QWidget *host)
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{
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if (!chart || !host) return;
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// 1. 坐标轴
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for (auto *axis : chart->axes()) {
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axis->setLabelsFont(host->font());
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axis->setLabelsColor(host->palette().color(QPalette::WindowText));
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axis->setTitleFont(host->font());
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axis->setTitleBrush(QBrush(host->palette().color(QPalette::WindowText)));
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}
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// 2. 图例
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if (auto *legend = chart->legend()) {
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legend->setFont(host->font());
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legend->setLabelColor(host->palette().color(QPalette::WindowText));
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}
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// 3. 标题（虽然已隐藏，也顺手同步）
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chart->setTitleFont(host->font());
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chart->setTitleBrush(QBrush(host->palette().color(QPalette::WindowText)));
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}
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CurvePlotWidget::CurvePlotWidget(QWidget *parent)
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: QWidget(parent)
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{
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initChart();
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}
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void CurvePlotWidget::changeEvent(QEvent *e)
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{
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QWidget::changeEvent(e);
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if (e->type() == QEvent::FontChange || e->type() == QEvent::PaletteChange)
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syncChartFontsAndColors(m_chart, this);
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}
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void CurvePlotWidget::initChart()
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{
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m_chart = new QChart;
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m_chart->setTitle(""); // 无标题
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m_chart->setMargins(QMargins(0,0,0,0)); // 关键：外框 0
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m_chart->layout()->setContentsMargins(0,0,0,0);
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m_chart->setBackgroundRoundness(0);
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m_chart->setBackgroundVisible(false);
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m_chart->legend()->setVisible(true); // 先隐藏图例，想显示时再 true
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/* ---------- X 轴：当前时间 ---------- */
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m_axisX = new QDateTimeAxis;
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m_axisX->setFormat("hh:mm:ss"); // 时分秒
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m_axisX->setTitleText(""); // 不显示轴标题
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m_axisX->setLabelsVisible(true); // 不显示刻度数字
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/* ---------- Y 轴 ---------- */
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m_axisY = new QValueAxis;
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m_axisY->setRange(-10, 10);
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m_axisY->setTitleText(""); // 不显示轴标题
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m_axisY->setLabelsVisible(true); // 不显示刻度数字
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m_chart->addAxis(m_axisX, Qt::AlignBottom);
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m_chart->addAxis(m_axisY, Qt::AlignLeft);
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/* 3. 视图 */
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m_view = new QChartView(m_chart);
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m_view->setRenderHint(QPainter::Antialiasing);
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m_view->setBackgroundBrush(Qt::NoBrush);
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m_view->setFrameShape(QFrame::NoFrame);
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m_view->setContentsMargins(0,0,0,0); // 视图本身无留白
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/* 4. 布局 */
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QVBoxLayout *lay = new QVBoxLayout(this);
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lay->setContentsMargins(0,0,0,0); // 父布局无留白
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lay->setSpacing(0); // 间距也 0
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lay->addWidget(m_view);
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}
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int CurvePlotWidget::addSeries(const QString &name, const QColor &color)
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{
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QLineSeries *series = new QLineSeries;
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series->setName(name);
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series->setColor(color);
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series->setUseOpenGL(true);
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m_chart->addSeries(series);
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series->attachAxis(m_axisX);
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series->attachAxis(m_axisY);
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m_series.append(series);
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return m_series.size() - 1;
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}
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void CurvePlotWidget::appendPoint(int seriesIndex, double yValue)
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{
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if (seriesIndex < 0 || seriesIndex >= m_series.size())
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return;
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qint64 nowMs = QDateTime::currentMSecsSinceEpoch();
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m_series[seriesIndex]->append(nowMs, yValue);
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// if (m_series[seriesIndex]->count() > MAX_POINTS)
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// m_series[seriesIndex]->remove(0);
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updateAxisRange();
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}
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void CurvePlotWidget::updateAxisRange()
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{
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qreal minY = 1e9, maxY = -1e9;
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for (QLineSeries *s : qAsConst(m_series)) {
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const auto pts = s->pointsVector();
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for (const QPointF &p : pts) {
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minY = qMin(minY, p.y());
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maxY = qMax(maxY, p.y());
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}
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}
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if (minY == 1e9) minY = -10;
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if (maxY == -1e9) maxY = 10;
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m_axisY->setRange(minY - 1, maxY + 1);
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/* X 轴：最近 TIME_WINDOW_S 秒 */
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qint64 now = QDateTime::currentMSecsSinceEpoch();
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m_axisX->setRange(QDateTime::fromMSecsSinceEpoch(now - TIME_WINDOW_S * 1000),
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QDateTime::fromMSecsSinceEpoch(now));
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}
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