adding helper to get number of axles for an axleConfiguration

VectoCommon/VectoCommon/Models/AxleConfiguration.cs

@@ -29,6 +29,7 @@
 *   Martin Rexeis, rexeis@ivt.tugraz.at, IVT, Graz University of Technology
 */
 
+using System;
 using System.Diagnostics.CodeAnalysis;
 using TUGraz.VectoCommon.Utils;
 
@@ -68,5 +69,24 @@ namespace TUGraz.VectoCommon.Models
 		{
 			return (Prefix + typeString).ParseEnum<AxleConfiguration>();
 		}
+
+		public static int NumAxles(this AxleConfiguration self)
+		{
+			switch (self) {
+				case AxleConfiguration.AxleConfig_4x2:
+				case AxleConfiguration.AxleConfig_4x4:
+					return 2;
+				case AxleConfiguration.AxleConfig_6x2:
+				case AxleConfiguration.AxleConfig_6x4:
+				case AxleConfiguration.AxleConfig_6x6:
+					return 3;
+				case AxleConfiguration.AxleConfig_8x2:
+				case AxleConfiguration.AxleConfig_8x4:
+				case AxleConfiguration.AxleConfig_8x6:
+				case AxleConfiguration.AxleConfig_8x8:
+					return 4;
+			}
+			return 0;
+		}
 	}
 }
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