Extract sum shear force logic

StructureHelperLogics/Models/BeamShears/Logics/CoordinateByLevelLogic.cs

@@ -0,0 +1,44 @@
+using StructureHelperCommon.Infrastructures.Exceptions;
+using StructureHelperCommon.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.Models.BeamShears
+{
+    public class CoordinateByLevelLogic : ICoordinateByLevelLogic
+    {
+        public IShiftTraceLogger? TraceLogger { get; set; }
+
+        public CoordinateByLevelLogic(IShiftTraceLogger? traceLogger)
+        {
+            TraceLogger = traceLogger;
+        }
+
+        public double GetCoordinate(double startCoord, double endCoord, double relativeLevel)
+        {
+            CheckRelativeLevel(relativeLevel);
+            double delta = endCoord - startCoord;
+            double coordinate = startCoord + delta * (relativeLevel + 0.5d);
+            return coordinate;
+        }
+
+        private void CheckRelativeLevel(double relativeLevel)
+        {
+            if (relativeLevel > 0.5d)
+            {
+                string errorString = ErrorStrings.IncorrectValue + ": relative level must not be greater than 0.5";
+                TraceLogger?.AddMessage(errorString, TraceLogStatuses.Error);
+                throw new StructureHelperException(errorString);
+            }
+            if (relativeLevel < -0.5d)
+            {
+                string errorString = ErrorStrings.IncorrectValue + ": relative level must not be less than -0.5";
+                TraceLogger?.AddMessage(errorString, TraceLogStatuses.Error);
+                throw new StructureHelperException(errorString);
+            }
+        }
+    }
+}