Add method to compute max pad number

Adding new methods to compute the largest pad number and the number of pads per gas volume. Because of the number of pad rows is set to 18, the largest pad number is greater or equal to the number of pads.

Tagging @sfuenzal

MuonSpectrometer/MuonDetDescr/MuonReadoutGeometry/MuonReadoutGeometry/sTgcReadoutElement.h

@@ -86,6 +86,13 @@ namespace MuonGM {
         virtual int numberOfStrips(const Identifier& layerId) const override final;
         virtual int numberOfStrips(int, bool measuresPhi) const override final;
 
+        /** Get the number of pad per layer */
+        int numberOfPads(const Identifier& layerId) const;
+
+        /** Get largest pad number, which is different to the number of pads in 
+            a gas volume due to the pad numbering in Athena */
+        int maxPadNumber(const Identifier& layerId) const;
+
         /** space point position for a given pair of phi and eta identifiers
             The LocalPosition is expressed in the reference frame of the phi
            surface. If one of the identifiers is outside the valid range, the
@@ -347,6 +354,26 @@ namespace MuonGM {
         return -1;
     }
 
+    inline int sTgcReadoutElement::numberOfPads(const Identifier& layerId) const {
+        const MuonPadDesign* design = getPadDesign(layerId);
+        if (!design) {
+            MsgStream log(Athena::getMessageSvc(), "sTgcReadoutElement");
+            log << MSG::WARNING << "no pad design found when trying to get the number of pads" << endmsg;
+            return 0;
+        }
+        return design->nPadColumns * design->nPadH;
+    }
+
+    inline int sTgcReadoutElement::maxPadNumber(const Identifier& layerId) const {
+        const MuonPadDesign* design = getPadDesign(layerId);
+        if (!design) {
+            MsgStream log(Athena::getMessageSvc(), "sTgcReadoutElement");
+            log << MSG::WARNING << "no pad design found when trying to get the largest pad number" << endmsg;
+            return 0;
+        }
+        return (design->nPadColumns - 1) * manager()->stgcIdHelper()->padEtaMax() + design->nPadH;
+    }
+
     inline bool sTgcReadoutElement::spacePointPosition(const Identifier& phiId, const Identifier& etaId, Amg::Vector2D& pos) const {
         Amg::Vector2D phiPos;
         Amg::Vector2D etaPos;