Initial implementation

RGBSync+/Brushes/SyncBrush.cs

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+using System.ComponentModel;
+using RGB.NET.Core;
+using RGBSyncPlus.Helper;
+using RGBSyncPlus.Model;
+
+namespace RGBSyncPlus.Brushes
+{
+    public class SyncBrush : AbstractBrush
+    {
+        #region Properties & Fields
+
+        private readonly SyncGroup _syncGroup;
+
+        private Led _syncLed;
+
+        #endregion
+
+        #region Constructors
+
+        public SyncBrush(SyncGroup syncGroup)
+        {
+            this._syncGroup = syncGroup;
+
+            syncGroup.PropertyChanged += SyncGroupOnPropertyChanged;
+            _syncLed = syncGroup.SyncLed?.GetLed();
+        }
+
+        #endregion
+
+        #region Methods
+
+        private void SyncGroupOnPropertyChanged(object sender, PropertyChangedEventArgs e)
+        {
+            if (e.PropertyName == nameof(SyncGroup.SyncLed))
+                _syncLed = _syncGroup.SyncLed?.GetLed();
+        }
+
+        protected override Color GetColorAtPoint(Rectangle rectangle, BrushRenderTarget renderTarget)
+        {
+            if (renderTarget.Led == _syncLed)
+                return Color.Transparent;
+
+            return _syncLed?.Color ?? Color.Transparent;
+        }
+
+        #endregion
+    }
+}