Detector: correct getRow/getColumn and getLocalPosition memeber functions

(cherry picked from commit 75552e28)

src/core/detector/Detector.cpp

@@ -379,13 +379,14 @@ bool Detector::hitMasked(Track* track, int tolerance) const {
 
 // Functions to get row and column from local position
 double Detector::getRow(const PositionVector3D<Cartesian3D<double>> localPosition) const {
-    // (1-m_nPixelsX%2)/2. --> add 1/2 pixel pitch if even number of rows
-    double row = localPosition.Y() / m_pitch.Y() + static_cast<double>(m_nPixels.Y()) / 2. + (1 - m_nPixels.Y() % 2) / 2.;
+
+    double row = localPosition.Y() / m_pitch.Y() + static_cast<double>(m_nPixels.Y() - 1) / 2.;
     return row;
 }
+
 double Detector::getColumn(const PositionVector3D<Cartesian3D<double>> localPosition) const {
-    // (1-m_nPixelsX%2)/2. --> add 1/2 pixel pitch if even number of columns
-    double column = localPosition.X() / m_pitch.X() + static_cast<double>(m_nPixels.X()) / 2. + (1 - m_nPixels.X() % 2) / 2.;
+
+    double column = localPosition.X() / m_pitch.X() + static_cast<double>(m_nPixels.X() - 1) / 2.;
     return column;
 }
 
@@ -393,7 +394,7 @@ double Detector::getColumn(const PositionVector3D<Cartesian3D<double>> localPosi
 PositionVector3D<Cartesian3D<double>> Detector::getLocalPosition(double column, double row) const {
 
     return PositionVector3D<Cartesian3D<double>>(
-        m_pitch.X() * (column - m_nPixels.X() / 2), m_pitch.Y() * (row - m_nPixels.Y() / 2), 0.);
+        m_pitch.X() * (column - (m_nPixels.X() - 1) / 2.), m_pitch.Y() * (row - (m_nPixels.Y() - 1) / 2.), 0.);
 }
 
 // Function to get in-pixel position