Add Assertions for color values and fix some wrong ones

Vocaluxe/Screens/CScreenSing.cs

@@ -18,7 +18,6 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
-using System.Drawing;
 using System.IO;
 using System.Linq;
 using System.Windows.Forms;
@@ -1200,8 +1199,8 @@ namespace Vocaluxe.Screens
                     }
                     else
                     {
-                        _Statics[_StaticSongText].Color.A = 10f - t / 3f;
-                        _Texts[_TextSongName].Color.A = 10f - t / 3f;
+                        _Statics[_StaticSongText].Color.A = (10f - t) / 3f;
+                        _Texts[_TextSongName].Color.A = (10f - t) / 3f;
                     }
                 }
                 else

VocaluxeLib/Menu/SingNotes/CSingNotes.cs

@@ -332,7 +332,7 @@ namespace VocaluxeLib.Menu.SingNotes
                         );
 
                     _DrawNoteBG(rect, color, 1f, _PlayerNotes[n].Timer);
-                    _DrawNote(rect, new SColorF(5f, 5f, 5f, 0.7f * _PlayerNotes[n].Alpha), 0.7f);
+                    _DrawNote(rect, new SColorF(1f, 1f, 1f, 0.7f * _PlayerNotes[n].Alpha), 0.7f);
 
                     if (note.Type == ENoteType.Golden)
                     {
@@ -541,10 +541,12 @@ namespace VocaluxeLib.Menu.SingNotes
 
         protected void _DrawNoteLines(SRectF rect, SColorF color)
         {
+            int x1 = (int)rect.X;
+            int x2 = (int)(rect.X + rect.W);
             for (int i = 0; i < CBase.Settings.GetNumNoteLines() - 1; i++)
             {
-                float y = rect.Y + rect.H / CBase.Settings.GetNumNoteLines() * (i + 1);
-                CBase.Drawing.DrawColor(color, new SRectF(rect.X, y, rect.W, 1, -1.0f));
+                int y = (int)(rect.Y + rect.H / CBase.Settings.GetNumNoteLines() * (i + 1));
+                CBase.Drawing.DrawLine(color, 1, x1, y, x2, y);
             }
         }
 

VocaluxeLib/Structs.cs

@@ -17,6 +17,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Drawing;
 using System.Windows.Forms;
 using VocaluxeLib.Songs;
@@ -34,6 +35,8 @@ namespace VocaluxeLib
 
         public SColorF(float r, float g, float b, float a)
         {
+            Debug.Assert(r.IsInRange(0, 1) && g.IsInRange(0, 1) && b.IsInRange(0, 1));
+            Debug.Assert(a.IsInRange(0, 1));
             R = r;
             G = g;
             B = b;