1 files changed, 39 insertions, 0 deletions
diff --git a/Plugins/MonoGame.Extended/source/MonoGame.Extended.Collisions/Layers/Layer.cs b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Collisions/Layers/Layer.cs
new file mode 100644
index 0000000..6e97ac8
--- /dev/null
+++ b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Collisions/Layers/Layer.cs
@@ -0,0 +1,39 @@
+using System;
+
+namespace MonoGame.Extended.Collisions.Layers;
+
+/// <summary>
+/// Layer is a group of collision's actors.
+/// </summary>
+public class Layer
+{
+    /// <summary>
+    /// If this property equals true, layer always will reset collision space.
+    /// </summary>
+    public bool IsDynamic { get; set; } = true;
+
+
+    /// <summary>
+    /// The space, which contain actors.
+    /// </summary>
+    public readonly ISpaceAlgorithm Space;
+
+    /// <summary>
+    /// Constructor for layer
+    /// </summary>
+    /// <param name="spaceAlgorithm">A space algorithm for actors</param>
+    /// <exception cref="ArgumentNullException"><paramref name="spaceAlgorithm"/> is null</exception>
+    public Layer(ISpaceAlgorithm spaceAlgorithm)
+    {
+        Space = spaceAlgorithm ?? throw new ArgumentNullException(nameof(spaceAlgorithm));
+    }
+
+    /// <summary>
+    /// Restructure a inner collection, if layer is dynamic, because actors can change own position
+    /// </summary>
+    public virtual void Reset()
+    {
+        if (IsDynamic)
+            Space.Reset();
+    }
+}