Added SpreadMethod for gradients

XGraphics.WPF/Brushes/GradientBrush.cs

@@ -1,17 +1,26 @@
 using System.Collections.Generic;
 using XGraphics.Brushes;
+using System.Windows;
 using System.Windows.Markup;
 
 namespace XGraphics.WPF.Brushes
 {
     public class GradientBrush : Brush, IGradientBrush
     {
+        public static readonly DependencyProperty SpreadMethodProperty = PropertyUtils.Create(nameof(SpreadMethod), typeof(GradientSpreadMethod), typeof(GradientBrush), GradientSpreadMethod.Pad);
+
         public GradientBrush()
         {
             GradientStops = new GraphicsObjectCollection<GradientStop>();
             GradientStops.Changed += OnSubobjectChanged;
         }
 
+        public GradientSpreadMethod SpreadMethod
+        {
+            get => (GradientSpreadMethod)GetValue(SpreadMethodProperty);
+            set => SetValue(SpreadMethodProperty, value);
+        }
+
         IEnumerable<IGradientStop> IGradientBrush.GradientStops => GradientStops;
         public GraphicsObjectCollection<GradientStop> GradientStops
         {

XGraphics.XamarinForms/Brushes/GradientBrush.cs

@@ -6,12 +6,20 @@ namespace XGraphics.XamarinForms.Brushes
 {
     public class GradientBrush : Brush, IGradientBrush
     {
+        public static readonly BindableProperty SpreadMethodProperty = PropertyUtils.Create(nameof(SpreadMethod), typeof(GradientSpreadMethod), typeof(GradientBrush), GradientSpreadMethod.Pad);
+
         public GradientBrush()
         {
             GradientStops = new GraphicsObjectCollection<GradientStop>();
             GradientStops.Changed += OnSubobjectChanged;
         }
 
+        public GradientSpreadMethod SpreadMethod
+        {
+            get => (GradientSpreadMethod)GetValue(SpreadMethodProperty);
+            set => SetValue(SpreadMethodProperty, value);
+        }
+
         IEnumerable<IGradientStop> IGradientBrush.GradientStops => GradientStops;
         public GraphicsObjectCollection<GradientStop> GradientStops
         {

XGraphics/Brushes/GradientSpreadMethod.cs

@@ -0,0 +1,9 @@
+namespace XGraphics.Brushes
+{
+    public enum GradientSpreadMethod
+    {
+        Pad = 0,
+        Reflect = 1,
+        Repeat = 2
+    }
+}

XGraphics/Brushes/IGradientBrush.cs

@@ -5,6 +5,9 @@ namespace XGraphics.Brushes
     [GraphicsModelObject]
     public interface IGradientBrush : IBrush
     {
+        [ModelDefaultValue(GradientSpreadMethod.Pad)]
+        GradientSpreadMethod SpreadMethod { get; }
+
         IEnumerable<IGradientStop> GradientStops { get; }
     }
 }