Method rectDistance

src/qt/qcustomplot.cpp:12406–12430

! \internal A convenience function which returns the selectTest value for a specified \a rect and a specified click position \a pos. \a filledRect defines whether a click inside the rect should also be considered a hit or whether only the rect border is sensitive to hits. This function may be used to help with the implementation of the \ref selectTest function for specific items.

  returned values.
*/
double QCPAbstractItem::rectDistance(const QRectF &rect, const QPointF &pos, bool filledRect) const
{
  double result = -1;

  // distance to border:
  QList<QLineF> lines;
  lines << QLineF(rect.topLeft(), rect.topRight()) << QLineF(rect.bottomLeft(), rect.bottomRight())
        << QLineF(rect.topLeft(), rect.bottomLeft()) << QLineF(rect.topRight(), rect.bottomRight());
  double minDistSqr = std::numeric_limits<double>::max();
  for (int i=0; i<lines.size(); ++i)
  {
    double distSqr = QCPVector2D(pos).distanceSquaredToLine(lines.at(i).p1(), lines.at(i).p2());
    if (distSqr < minDistSqr)
      minDistSqr = distSqr;
  }
  result = qSqrt(minDistSqr);
  
  // filled rect, allow click inside to count as hit:
  if (filledRect && result > mParentPlot->selectionTolerance()*0.99)
  {
    if (rect.contains(pos))
      result = mParentPlot->selectionTolerance()*0.99;
  }
  return result;
}

/*! \internal