Added brightness and opacity to brushes

This resolves #10

CUE.NET.csproj

@@ -45,6 +45,7 @@
     <Compile Include="Devices\Generic\Enums\CorsairAccessMode.cs" />
     <Compile Include="Devices\Generic\Enums\CorsairDeviceCaps.cs" />
     <Compile Include="Devices\Generic\Enums\CorsairDeviceType.cs" />
+    <Compile Include="Devices\Keyboard\Brushes\AbstractBrush.cs" />
     <Compile Include="Devices\Keyboard\Brushes\GradientStop.cs" />
     <Compile Include="Devices\Keyboard\Brushes\IBrush.cs" />
     <Compile Include="Devices\Keyboard\Brushes\LinearGradientBrush.cs" />

Devices/Keyboard/Brushes/AbstractBrush.cs

@@ -0,0 +1,41 @@
+using System.Drawing;
+using CUE.NET.Helper;
+
+namespace CUE.NET.Devices.Keyboard.Brushes
+{
+    public abstract class AbstractBrush : IBrush
+    {
+        #region Properties & Fields
+
+        public float Brightness { get; set; }
+        public float Opacity { get; set; }
+
+        #endregion
+
+        #region Constructors
+
+        protected AbstractBrush(float brightness = 1f, float opacity = 1f)
+        {
+            this.Brightness = brightness;
+            this.Opacity = opacity;
+        }
+
+        #endregion
+
+        #region Methods
+
+        public abstract Color GetColorAtPoint(RectangleF rectangle, PointF point);
+
+        protected virtual Color FinalizeColor(Color color)
+        {
+            // Since we use HSV to calculate there is no way to make a color 'brighter' than 100%
+            // Be carefull with the naming: Since we use HSV the correct term is 'value' but outside we call it 'brightness'
+            // THIS IS NOT A HSB CALCULATION!!!
+            float finalBrightness = color.GetHSVValue() * (Brightness < 0 ? 0 : (Brightness > 1f ? 1f : Brightness));
+            byte finalAlpha = (byte)(color.A * (Opacity < 0 ? 0 : (Opacity > 1f ? 1f : Opacity)));
+            return ColorHelper.ColorFromHSV(color.GetHue(), color.GetHSVSaturation(), finalBrightness, finalAlpha);
+        }
+
+        #endregion
+    }
+}

Devices/Keyboard/Brushes/IBrush.cs

@@ -4,6 +4,9 @@ namespace CUE.NET.Devices.Keyboard.Brushes
 {
     public interface IBrush
     {
+        float Brightness { get; set; }
+        float Opacity { get; set; }
+
         Color GetColorAtPoint(RectangleF rectangle, PointF point);
     }
 }

Devices/Keyboard/Brushes/LinearGradientBrush.cs

@@ -2,7 +2,6 @@
 // ReSharper disable MemberCanBePrivate.Global
 // ReSharper disable ReturnTypeCanBeEnumerable.Global
 
-using System;
 using System.Collections.Generic;
 using System.Drawing;
 using System.Linq;
@@ -10,7 +9,7 @@ using CUE.NET.Helper;
 
 namespace CUE.NET.Devices.Keyboard.Brushes
 {
-    public class LinearGradientBrush : IBrush
+    public class LinearGradientBrush : AbstractBrush
     {
         #region Properties & Fields
 
@@ -44,7 +43,7 @@ namespace CUE.NET.Devices.Keyboard.Brushes
 
         #region Methods
 
-        public Color GetColorAtPoint(RectangleF rectangle, PointF point)
+        public override Color GetColorAtPoint(RectangleF rectangle, PointF point)
         {
             if (!GradientStops.Any()) return Color.Transparent;
             if (GradientStops.Count == 1) return GradientStops.First().Color;
@@ -75,7 +74,8 @@ namespace CUE.NET.Devices.Keyboard.Brushes
             byte colR = (byte)((gsAfter.Color.R - gsBefore.Color.R) * blendFactor + gsBefore.Color.R);
             byte colG = (byte)((gsAfter.Color.G - gsBefore.Color.G) * blendFactor + gsBefore.Color.G);
             byte colB = (byte)((gsAfter.Color.B - gsBefore.Color.B) * blendFactor + gsBefore.Color.B);
-            return Color.FromArgb(colA, colR, colG, colB);
+
+            return FinalizeColor(Color.FromArgb(colA, colR, colG, colB));
         }
 
         #endregion

Devices/Keyboard/Brushes/RainbowBrush.cs

@@ -1,10 +1,11 @@
-using System;
+// ReSharper disable MemberCanBePrivate.Global
+
 using System.Drawing;
 using CUE.NET.Helper;
 
 namespace CUE.NET.Devices.Keyboard.Brushes
 {
-    public class RainbowBrush : IBrush
+    public class RainbowBrush : AbstractBrush
     {
         #region Properties & Fields
 
@@ -12,61 +13,39 @@ namespace CUE.NET.Devices.Keyboard.Brushes
         public PointF EndPoint { get; set; } = new PointF(1f, 0.5f);
         public float StartHue { get; set; }
         public float EndHue { get; set; }
-        public int Alpha { get; set; } = 255;
 
         #endregion
 
         #region Constructors
 
-        public RainbowBrush(float startHue = 0f, float endHue = 360f, int alpha = 255)
+        public RainbowBrush(float startHue = 0f, float endHue = 360f)
         {
             this.StartHue = startHue;
             this.EndHue = endHue;
-            this.Alpha = alpha;
         }
 
-        public RainbowBrush(PointF startPoint, PointF endPoint, float startHue = 0f, float endHue = 360f, int alpha = 255)
+        public RainbowBrush(PointF startPoint, PointF endPoint, float startHue = 0f, float endHue = 360f)
         {
             this.StartPoint = startPoint;
             this.EndPoint = endPoint;
             this.StartHue = startHue;
             this.EndHue = endHue;
-            this.Alpha = alpha;
         }
 
         #endregion
 
         #region Methods
 
-        public Color GetColorAtPoint(RectangleF rectangle, PointF point)
+        public override Color GetColorAtPoint(RectangleF rectangle, PointF point)
         {
             PointF startPoint = new PointF(StartPoint.X * rectangle.Width, StartPoint.Y * rectangle.Height);
             PointF endPoint = new PointF(EndPoint.X * rectangle.Width, EndPoint.Y * rectangle.Height);
 
             float offset = GradientHelper.CalculateGradientOffset(startPoint, endPoint, point);
             float range = EndHue - StartHue;
-            float progress = (StartHue + (range * offset)) / 360f;
 
-            float div = (Math.Abs(progress % 1) * 6);
-            int value = (int)((div % 1) * 255);
-
-            switch ((int)div)
-            {
-                case 0:
-                    return Color.FromArgb(Alpha, 255, value, 0);
-                case 1:
-                    return Color.FromArgb(Alpha, 255 - value, 255, 0);
-                case 2:
-                    return Color.FromArgb(Alpha, 0, 255, value);
-                case 3:
-                    return Color.FromArgb(Alpha, 0, 255 - value, 255);
-                case 4:
-                    return Color.FromArgb(Alpha, value, 0, 255);
-                case 5:
-                    return Color.FromArgb(Alpha, 255, 0, 255 - value);
-                default:
-                    return Color.Transparent;
-            }
+            float hue = (StartHue + (range * offset)) % 360f;
+            return FinalizeColor(ColorHelper.ColorFromHSV(hue, 1f, 1f));
         }
 
         #endregion

Devices/Keyboard/Brushes/SolidColorBrush.cs

@@ -1,8 +1,10 @@
+// ReSharper disable MemberCanBePrivate.Global
+
 using System.Drawing;
 
 namespace CUE.NET.Devices.Keyboard.Brushes
 {
-    public class SolidColorBrush : IBrush
+    public class SolidColorBrush : AbstractBrush
     {
         #region Properties & Fields
 
@@ -21,9 +23,9 @@ namespace CUE.NET.Devices.Keyboard.Brushes
 
         #region Methods
 
-        public Color GetColorAtPoint(RectangleF rectangle, PointF point)
+        public override Color GetColorAtPoint(RectangleF rectangle, PointF point)
         {
-            return Color; // A solid color brush returns the same color no matter the point
+            return FinalizeColor(Color);
         }
 
         #endregion