Replaced effects with decorators.

Decorators should be way more flexible while beeing easy to use.

RGB.NET.Decorators/Brush/FlashDecorator.cs

@@ -0,0 +1,156 @@
+// ReSharper disable MemberCanBePrivate.Global
+// ReSharper disable AutoPropertyCanBeMadeGetOnly.Global
+// ReSharper disable UnusedMember.Global
+
+using System;
+using RGB.NET.Core;
+
+namespace RGB.NET.Decorators.Brush
+{
+    /// <summary>
+    /// Represents a decorator which allows to flash a brush by modifying his opacity.
+    /// </summary>
+    public class FlashDecorator : AbstractUpdateAwareDecorator, IBrushDecorator
+    {
+        #region Properties & Fields
+
+        /// <summary>
+        /// Gets or sets the attack-time (in seconds) of the decorator. (default: 0.2)<br />
+        /// This is close to a synthesizer envelope. (See <see href="http://en.wikipedia.org/wiki/Synthesizer#ADSR_envelope" />  as reference)
+        /// </summary>
+        public double Attack { get; set; } = 0.2;
+
+        /// <summary>
+        /// Gets or sets the decay-time (in seconds) of the decorator. (default: 0)<br />
+        /// This is close to a synthesizer envelope. (See <see href="http://en.wikipedia.org/wiki/Synthesizer#ADSR_envelope" /> as reference)
+        /// </summary>
+        public double Decay { get; set; } = 0;
+
+        /// <summary>
+        /// Gets or sets the sustain-time (in seconds) of the decorator. (default: 0.3)<br />
+        /// This is close to a synthesizer envelope. (See <see href="http://en.wikipedia.org/wiki/Synthesizer#ADSR_envelope" /> as reference)<br />
+        /// Note that this value for naming reasons represents the time NOT the level.
+        /// </summary>
+        public double Sustain { get; set; } = 0.3;
+
+        /// <summary>
+        /// Gets or sets the release-time (in seconds) of the decorator. (default: 0.2)<br />
+        /// This is close to a synthesizer envelope. (See <see href="http://en.wikipedia.org/wiki/Synthesizer#ADSR_envelope" /> as reference)
+        /// </summary>
+        public double Release { get; set; } = 0.2;
+
+        /// <summary>
+        /// Gets or sets the level to which the oppacity (percentage) should raise in the attack-cycle. (default: 1);
+        /// </summary>
+        public double AttackValue { get; set; } = 1;
+
+        /// <summary>
+        /// Gets or sets the level at which the oppacity (percentage) should stay in the sustain-cycle. (default: 1);
+        /// </summary>
+        public double SustainValue { get; set; } = 1;
+
+        /// <summary>
+        /// Gets or sets the interval (in seconds) in which the decorator should repeat (if repetition is enabled). (default: 1)
+        /// </summary>
+        public double Interval { get; set; } = 1;
+
+        /// <summary>
+        /// Gets or sets the amount of repetitions the decorator should do until it's finished. Zero means infinite. (default: 0)
+        /// </summary>
+        public int Repetitions { get; set; } = 0;
+
+        private ADSRPhase _currentPhase;
+        private double _currentPhaseValue;
+        private int _repetitionCount;
+
+        private double _currentValue;
+
+        #endregion
+
+        #region Methods
+
+        /// <inheritdoc />
+        public void ManipulateColor(Rectangle rectangle, BrushRenderTarget renderTarget, ref Color color) => color.APercent = _currentValue;
+
+        /// <inheritdoc />
+        protected override void Update(double deltaTime)
+        {
+            _currentPhaseValue -= deltaTime;
+
+            // Using ifs instead of a switch allows to skip phases with time 0.
+            // ReSharper disable InvertIf
+
+            if (_currentPhase == ADSRPhase.Attack)
+                if (_currentPhaseValue > 0)
+                    _currentValue = Math.Min(1, (Attack - _currentPhaseValue) / Attack) * AttackValue;
+                else
+                {
+                    _currentPhaseValue = Decay;
+                    _currentPhase = ADSRPhase.Decay;
+                }
+
+            if (_currentPhase == ADSRPhase.Decay)
+                if (_currentPhaseValue > 0)
+                    _currentValue = SustainValue + (Math.Min(1, _currentPhaseValue / Decay) * (AttackValue - SustainValue));
+                else
+                {
+                    _currentPhaseValue = Sustain;
+                    _currentPhase = ADSRPhase.Sustain;
+                }
+
+            if (_currentPhase == ADSRPhase.Sustain)
+                if (_currentPhaseValue > 0)
+                    _currentValue = SustainValue;
+                else
+                {
+                    _currentPhaseValue = Release;
+                    _currentPhase = ADSRPhase.Release;
+                }
+
+            if (_currentPhase == ADSRPhase.Release)
+                if (_currentPhaseValue > 0)
+                    _currentValue = Math.Min(1, _currentPhaseValue / Release) * SustainValue;
+                else
+                {
+                    _currentPhaseValue = Interval;
+                    _currentPhase = ADSRPhase.Pause;
+                }
+
+            if (_currentPhase == ADSRPhase.Pause)
+                if (_currentPhaseValue > 0)
+                    _currentValue = 0;
+                else
+                {
+                    if ((++_repetitionCount >= Repetitions) && (Repetitions > 0))
+                        Detach<IBrush, FlashDecorator>();
+                    _currentPhaseValue = Attack;
+                    _currentPhase = ADSRPhase.Attack;
+                }
+
+            // ReSharper restore InvertIf
+        }
+
+        /// <inheritdoc />
+        public override void OnAttached(IDecoratable decoratable)
+        {
+            base.OnAttached(decoratable);
+
+            _currentPhase = ADSRPhase.Attack;
+            _currentPhaseValue = Attack;
+            _repetitionCount = 0;
+            _currentValue = 0;
+        }
+
+        #endregion
+
+        // ReSharper disable once InconsistentNaming
+        private enum ADSRPhase
+        {
+            Attack,
+            Decay,
+            Sustain,
+            Release,
+            Pause
+        }
+    }
+}