ToStringRounded => ToDisplayString, introduce scientific notation (mW, kW,...) for units

csharp/App/SaliMax/src/Flow.cs

@@ -14,7 +14,7 @@ public static class Flow
 
     public static TextBlock Horizontal(Unit amount, Int32 width = 10)
     {
-        var label     = amount.ToStringRounded();
+        var label     = amount.ToDisplayString();
         var arrowChar = amount.Value < 0 ? LeftArrowChar : RightArrowChar;
         var arrow     = Enumerable.Repeat(arrowChar, width).Join();
 
@@ -26,7 +26,7 @@ public static class Flow
     [SuppressMessage("ReSharper", "CoVariantArrayConversion")]
     public static TextBlock Vertical(Unit amount, Int32 height = 4)
     {
-        var label     = amount.ToStringRounded();
+        var label     = amount.ToDisplayString();
         var arrowChar = amount.Value < 0 ? UpArrowChar : DownArrowChar;
         var halfArrow = Enumerable.Repeat(arrowChar, height/2);
         

csharp/App/SaliMax/src/System/StateMachine.cs

@@ -1,7 +1,9 @@
 namespace InnovEnergy.App.SaliMax.System;
 
-public class StateMachine
+public record StateMachine
 {
-    public String Message { get; set; } = "Panic: Unknown State!";
+    public required String Message { get; set; }  // TODO: init only 
-    public Int32  State   { get; set; } = 100;
+    public required Int32  State   { get; set; }  // TODO: init only
+
+    public static StateMachine Default { get; } = new StateMachine { State = 100, Message = "Unknown State" };
 }

csharp/Lib/Units/Unit.cs

@@ -8,5 +8,35 @@ public abstract class Unit
     public Double Value { get;  }
 
     public override String ToString() => $"{Value} {Symbol}";
-    public String ToStringRounded() => $"{Math.Round(Value,3)} {Symbol}";
+
+    public String ToDisplayString()
+    {
+        if (Value == 0)
+            return $"0 {Symbol}";
+
+        var a = Math.Abs(Value);
+        var s = Math.Sign(Value);
+
+        var i = 8;
+
+        while (a >= 10000)
+        {
+            a /= 1000;
+            i++;
+        }
+        while (a < 10)
+        {
+            a *= 1000;
+            i--;
+        }
+
+        var r = a < 100
+            ? Math.Floor(a * 10) / 10
+            : Math.Floor(a);
+
+        return $"{r * s} {Prefix[i]}{Symbol}";
+    }
+
+    private static readonly IReadOnlyList<String> Prefix = new[] { "y", "z", "a", "f", "p", "n", "µ", "m", "", "k", "M", "G", "T", "P", "E", "Y" };
 }
+

csharp/Lib/Units/Units.cs

@@ -1,5 +1,4 @@
 using System.Collections;
-using System.Reflection;
 using InnovEnergy.Lib.Units.Power;
 using InnovEnergy.Lib.Utils;
 using static System.Reflection.BindingFlags;
@@ -89,87 +88,3 @@ public static class Units
     }
 }
 
-public static class Prefixes
-{
-    private static readonly IReadOnlyList<String> Big = new[]
-    {
-        "",
-        "k",
-        "M",
-        "G",
-        "T",
-        "P",
-        "E",
-        "Y",
-    };
-
-    private static readonly IReadOnlyList<String> Small = new[]
-    {
-        "", 
-        "m",
-        "µ",
-        "n",
-        "p",
-        "f",
-        "a",
-        "z",
-        "y",
-    };
-
-    public static String TestGetPrefix(Double v, String unit)
-    {
-        if (v == 0)
-            return "";
-
-        var log10 = Math.Log10(v / 10);
-        var l = (Int32)Math.Floor(log10 / 3);
-        var lookUp = l > 0 ? Big : Small;
-        var i = Math.Abs(l);
-
-        return $"{v / Math.Pow(10.0, l * 3.0)} {lookUp[i]}{unit}";
-    }
-    
-    
-    public static String TestGetPrefix(Decimal v, String unit)
-    {
-        if (v == 0m)
-            return "";
-
-        var d = (Double)v;
-        var log10 = Math.Log10(d / 10);
-        var l = (Int32)Math.Floor(log10 / 3);
-        var lookUp = l > 0 ? Big : Small;
-        var i = Math.Abs(l);
-
-        return $"{d / Math.Pow(10.0, l * 3.0)} {lookUp[i]}{unit}";
-    }
-    
-    public static String TestGetPrefix2(Decimal v, String unit)
-    {
-        if (v == 0m)
-            return "";
-
-        var a = Math.Abs(v);
-        var s = Math.Sign(v);
-        
-        var i = 0;
-
-        while (a >= 10000m)
-        {
-            a /= 1000;
-            i++;
-        }
-        while (a < 10m)
-        {
-            a *= 1000;
-            i--;
-        }
-
-        var lookUp = i >= 0 ? Big : Small;
-        
-        var r = Decimal.Floor(a * 10m) / 10m;      
-
-        return $"{r*s} {lookUp[Math.Abs(i)]}{unit}";
-    }
-
-}