From 9a9bf52fe95caad2da577201d204d2d6e1e1afbe Mon Sep 17 00:00:00 2001
From: Darth Affe <darthaffe@wyrez.org>
Date: Thu, 22 Dec 2016 12:27:53 +0100
Subject: [PATCH] Added new brush-effect to move gradients

---
 CUE.NET.csproj                |  1 +
 Effects/MoveGradientEffect.cs | 97 +++++++++++++++++++++++++++++++++++
 2 files changed, 98 insertions(+)
 create mode 100644 Effects/MoveGradientEffect.cs

diff --git a/CUE.NET.csproj b/CUE.NET.csproj
index 65c71c0..59c5f6e 100644
--- a/CUE.NET.csproj
+++ b/CUE.NET.csproj
@@ -74,6 +74,7 @@
     <Compile Include="Devices\Mousemat\CorsairMousemat.cs" />
     <Compile Include="Devices\Mousemat\CorsairMousematDeviceInfo.cs" />
     <Compile Include="Devices\Mousemat\Enums\CorsairMousematLedId.cs" />
+    <Compile Include="Effects\MoveGradientEffect.cs" />
     <Compile Include="Gradients\AbstractGradient.cs" />
     <Compile Include="Gradients\GradientStop.cs" />
     <Compile Include="Gradients\IGradient.cs" />
diff --git a/Effects/MoveGradientEffect.cs b/Effects/MoveGradientEffect.cs
new file mode 100644
index 0000000..85f81e5
--- /dev/null
+++ b/Effects/MoveGradientEffect.cs
@@ -0,0 +1,97 @@
+using CUE.NET.Brushes;
+using CUE.NET.Gradients;
+
+namespace CUE.NET.Effects
+{
+    /// <summary>
+    /// Represents an effect which allows to move an gradient by modifying his offset.
+    /// </summary>
+    public class MoveGradientEffect : AbstractBrushEffect<IGradientBrush>
+    {
+        #region Properties & Fields
+
+        /// <summary>
+        /// Gets or sets the direction the gradient is moved.
+        /// True leads to an offset-increment (normaly moving to the right), false to an offset-decrement (normaly moving to the left).
+        /// </summary>
+        public bool Direction { get; set; }
+
+        /// <summary>
+        /// Gets or sets the speed of the movement in units per second.
+        /// The meaning of units differs for the different gradients, but 360 units will always be one complete cycle:
+        ///   LinearGradient: 360 unit = 1 offset.
+        ///   RainbowGradient: 1 unit = 1 degree.
+        /// </summary>
+        public float Speed { get; set; }
+
+        #endregion
+
+        #region Constructors
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="speed"></param>
+        /// <param name="direction"></param>
+        public MoveGradientEffect(float speed = 180f, bool direction = true)
+        {
+            this.Speed = speed;
+            this.Direction = direction;
+        }
+
+        #endregion
+
+        #region Methods
+        /// <summary>
+        /// Updates the effect.
+        /// </summary>
+        /// <param name="deltaTime">The elapsed time (in seconds) since the last update.</param>
+        public override void Update(float deltaTime)
+        {
+            float movement = Speed * deltaTime;
+
+            if (!Direction)
+                movement = -movement;
+
+            if (Brush.Gradient is LinearGradient)
+            {
+                LinearGradient linearGradient = (LinearGradient)Brush.Gradient;
+
+                movement /= 360f;
+
+                foreach (GradientStop gradientStop in linearGradient.GradientStops)
+                {
+                    gradientStop.Offset = gradientStop.Offset + movement;
+
+                    if (gradientStop.Offset > 1f)
+                        gradientStop.Offset -= 1f;
+                    else if (gradientStop.Offset < 0)
+                        gradientStop.Offset += 1f;
+                }
+            }
+            else if (Brush.Gradient is RainbowGradient)
+            {
+                RainbowGradient rainbowGradient = (RainbowGradient)Brush.Gradient;
+
+                // RainbowGradient is calculated inverse but the movement should be the same for all.
+                movement *= -1;
+
+                rainbowGradient.StartHue += movement;
+                rainbowGradient.EndHue += movement;
+                
+                if (rainbowGradient.StartHue > 360f && rainbowGradient.EndHue > 360f)
+                {
+                    rainbowGradient.StartHue -= 360f;
+                    rainbowGradient.EndHue -= 360f;
+                }
+                else if (rainbowGradient.StartHue < -360f && rainbowGradient.EndHue < -360f)
+                {
+                    rainbowGradient.StartHue += 360f;
+                    rainbowGradient.EndHue += 360f;
+                }
+            }
+        }
+
+        #endregion
+    }
+}