Rename solution directory to Elwig

Elwig/Helpers/Gradation.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Elwig.Helpers {
+    // 1 °KMW = 
+    // 1 °NM  = kg/100L = 10g/L
+    // 1 °Oe  = 
+    // 1 °Bé  =
+    // 1 °Bx  = g/100g (x Gramm Zucker pro 100 Gramm Flüssigkeit)
+    internal class Gradation {
+        /// <summary>
+        /// Gradation in mg/L.
+        /// </summary>
+        uint mgpl;
+
+        public Gradation(uint mgpl) {
+            this.mgpl = mgpl;
+        }
+
+        public static double relativeDensity(double todo) {
+            return 0;
+        }
+
+        public static double KmwToOe(double kmw) {
+            return 0;  // TODO
+        }
+
+        public static double OeToKmw(double oe) {
+            return 0;  // TODO
+        }
+
+        public static Gradation FromKmw(double kwm) {
+            return new Gradation(0);  // TODO
+        }
+
+        public static Gradation FromKmw(double kmw, double t) {
+            // The temperature can be ignored, because no volumetric unit is involved.
+            // 1 °KMW = 1g/100g
+            return FromKmw(kmw);
+        }
+
+        public static Gradation FromOe(double oe) {
+            return new Gradation(0);  // TODO
+        }
+
+        public static Gradation FromOe(double oe, double t) {
+            return null;
+        }
+    }
+}