Method convertPixelPosToPlotPos

YUViewLib/src/ui/views/PlotViewWidget.cpp:989–1024

}

QPointF PlotViewWidget::convertPixelPosToPlotPos(const QPointF &       pixelPos,
                                                 std::optional<double> zoomFactor) const
{
  if (!zoomFactor)
    zoomFactor = this->zoomFactor;

  Range<double> yRange = {0, 100};
  if (this->model)
    yRange = this->model->getYRange();
  const auto rangeY = double(yRange.max - yRange.min);

  const auto valueX =
      ((pixelPos.x() - this->propertiesAxis[0].line.p1().x() - this->moveOffset.x()) /
       (*zoomFactor)) /
      this->zoomToPixelsPerValueX;

  // line.p1 maps to the maximum y value and line.p2 to the lowest value
  if (this->fixYAxis)
  {
    const auto lineLength =
        this->propertiesAxis[1].line.p1().y() - this->propertiesAxis[1].line.p2().y();
    const double relativePos = (this->propertiesAxis[1].line.p1().y() - pixelPos.y()) / lineLength;
    const auto   valueY      = yRange.min + relativePos * rangeY;
    return {valueX, valueY};
  }
  else
  {
    const auto zoomToPixelsPerValueY =
        (this->propertiesAxis[1].line.p1().y() - this->propertiesAxis[1].line.p2().y()) / rangeY;
    const auto valueY =
        ((-pixelPos.y() + this->propertiesAxis[1].line.p1().y() + this->moveOffset.y()) /
         (*zoomFactor)) /
        zoomToPixelsPerValueY;
    return {valueX, valueY};
  }
}

void PlotViewWidget::onZoomRectUpdateOffsetAndZoom(QRectF zoomRect, double additionalZoomFactor)
{