Method showPointValues

pj_plotting/widget/src/PlotWidget.cpp:384–469

}

void PlotWidget::showPointValues(QPoint paint_point) {
  if (!show_points_ || show_point_marker_ == nullptr || show_point_text_ == nullptr) {
    return;
  }

  auto paint_to_plot = [this](QPoint p) {
    return QPointF(qwtPlot()->invTransform(QwtPlot::xBottom, p.x()), qwtPlot()->invTransform(QwtPlot::yLeft, p.y()));
  };
  auto plot_to_paint = [this](QPointF p) {
    return QPoint(qwtPlot()->transform(QwtPlot::xBottom, p.x()), qwtPlot()->transform(QwtPlot::yLeft, p.y()));
  };

  const QPointF mouse_in_plot = paint_to_plot(paint_point);
  const int precision = QSettings().value(QStringLiteral("Preferences::precision"), 3).toInt();

  QString text;
  int min_distance_sqr = kHoverHitRadiusPx * kHoverHitRadiusPx;
  bool updated = false;
  QPointF marker_point;
  const QwtPlotItemList curves = qwtPlot()->itemList(QwtPlotItem::Rtti_PlotCurve);
  for (auto* item : curves) {
    auto* curve = dynamic_cast<QwtPlotCurve*>(item);
    if (curve == nullptr || !curve->isVisible()) {
      continue;
    }
    const auto maybe_point = curvePointAt(curve, mouse_in_plot.x());
    if (!maybe_point) {
      continue;
    }
    const QPoint sample_paint = plot_to_paint(*maybe_point);
    const QPoint diff = sample_paint - paint_point;
    const int dist_sqr = diff.x() * diff.x() + diff.y() * diff.y();
    if (dist_sqr < min_distance_sqr) {
      updated = true;
      min_distance_sqr = dist_sqr;
      marker_point = *maybe_point;
      text =
          QString("<font color=%1>%2<br>x: %3<br>y: %4</font>")
              .arg(
                  curve->pen().color().name(), curve->title().text(), QString::number(maybe_point->x(), 'f', precision),
                  QString::number(maybe_point->y(), 'f', precision));
    }
  }

  const bool was_visible = show_point_marker_->isVisible();
  show_point_marker_->setVisible(updated);
  show_point_text_->setVisible(updated);

  if (updated) {
    show_point_marker_->setValue(marker_point);

    QwtText label;
    label.setText(text);
    label.setBorderPen(QColor(Qt::transparent));
    QColor background = qwtPlot()->palette().color(QPalette::Window);
    background.setAlpha(220);
    label.setBackgroundBrush(background);
    QFont font = QFontDatabase::systemFont(QFontDatabase::FixedFont);