diff --git a/Dashboard.Common/Anchor.cs b/Dashboard.Common/Anchor.cs
index 0505972..9b2579f 100644
--- a/Dashboard.Common/Anchor.cs
+++ b/Dashboard.Common/Anchor.cs
@@ -1,5 +1,6 @@
 namespace Dashboard
 {
+    [Flags]
     public enum Anchor
     {
         Auto    = 0,
diff --git a/Dashboard.Common/Box2d.cs b/Dashboard.Common/Box2d.cs
new file mode 100644
index 0000000..974228e
--- /dev/null
+++ b/Dashboard.Common/Box2d.cs
@@ -0,0 +1,65 @@
+using System.ComponentModel.DataAnnotations;
+using System.Drawing;
+using System.Numerics;
+
+namespace Dashboard
+{
+    public readonly record struct Box2d(Vector2 Min, Vector2 Max)
+    {
+        public float Left => Min.X;
+        public float Right => Max.X;
+        public float Top => Min.Y;
+        public float Bottom => Max.Y;
+
+        public Vector2 Size => Max - Min;
+        public Vector2 Center => (Min + Max) * 0.5f;
+
+        public Box2d(RectangleF rectangle)
+            : this(new Vector2(rectangle.Left, rectangle.Top), new Vector2(rectangle.Right, rectangle.Bottom))
+        {
+        }
+
+        public Box2d(float x0, float y0, float x1, float y1)
+            : this(new Vector2(x0, y0), new Vector2(x1, y1))
+        {
+        }
+
+        public static Box2d FromPositionAndSize(Vector2 position, Vector2 size, Origin anchor = Origin.Center)
+        {
+            Vector2 half = size * 0.5f;
+            switch (anchor)
+            {
+                case Origin.Center:
+                    return new Box2d(position - half, position + half);
+                case Origin.TopLeft:
+                    return new Box2d(position, position + size);
+                default:
+                    throw new NotImplementedException();
+            }
+        }
+
+        public static Box2d Union(Box2d left, Box2d right)
+        {
+            Vector2 min = Vector2.Min(left.Min, right.Min);
+            Vector2 max = Vector2.Max(left.Max, right.Max);
+            return new Box2d(min, max);
+        }
+
+        public static Box2d Intersect(Box2d left, Box2d right)
+        {
+            Vector2 min = Vector2.Max(left.Min, right.Min);
+            Vector2 max = Vector2.Min(left.Max, right.Max);
+            return new Box2d(min, max);
+        }
+
+        public static explicit operator RectangleF(Box2d box2d)
+        {
+            return new RectangleF((PointF)box2d.Center, (SizeF)box2d.Size);
+        }
+
+        public static explicit operator Box2d(RectangleF rectangle)
+        {
+            return new Box2d(rectangle);
+        }
+    }
+}
diff --git a/Dashboard.Common/Box3d.cs b/Dashboard.Common/Box3d.cs
index 1849546..e920fc8 100644
--- a/Dashboard.Common/Box3d.cs
+++ b/Dashboard.Common/Box3d.cs
@@ -1,4 +1,5 @@
-using System.Numerics;
+using System.Drawing;
+using System.Numerics;
 
 namespace Dashboard
 {
@@ -12,7 +13,7 @@ namespace Dashboard
         public float Near => Max.Z;
 
         public Vector3 Size => Max - Min;
-        public Vector3 Center => Min + Size / 2f;
+        public Vector3 Center => Min + Size * 0.5f;
 
         public static Box3d Union(Box3d left, Box3d right)
         {
@@ -21,11 +22,25 @@ namespace Dashboard
             return new Box3d(min, max);
         }
 
+        public static Box3d Union(Box3d box, Box2d bounds, float depth)
+        {
+            Vector3 min = Vector3.Min(box.Min, new Vector3(bounds.Left, bounds.Top, depth));
+            Vector3 max = Vector3.Max(box.Max, new Vector3(bounds.Right, bounds.Bottom, depth));
+            return new Box3d(min, max);
+        }
+
         public static Box3d Intersect(Box3d left, Box3d right)
         {
             Vector3 min = Vector3.Max(left.Min, right.Min);
             Vector3 max = Vector3.Min(left.Max, right.Max);
             return new Box3d(min, max);
         }
+
+        public static Box3d Intersect(Box3d box, Box2d bounds, float depth)
+        {
+            Vector3 min = Vector3.Max(box.Min, new Vector3(bounds.Min, depth));
+            Vector3 max = Vector3.Min(box.Max, new Vector3(bounds.Max, depth));
+            return new Box3d(min, max);
+        }
     }
 }
diff --git a/Dashboard.Common/LineProperties.cs b/Dashboard.Common/LineProperties.cs
new file mode 100644
index 0000000..047ab1c
--- /dev/null
+++ b/Dashboard.Common/LineProperties.cs
@@ -0,0 +1,23 @@
+namespace Dashboard
+{
+    public enum BorderKind
+    {
+        Inset = -1,
+        Center = 0,
+        Outset = 1,
+    }
+
+    public enum CapType
+    {
+        None,
+        Circular,
+        Rectangular,
+    }
+
+    public enum CuspType
+    {
+        None,
+        Circular,
+        Rectangular,
+    }
+}
diff --git a/Dashboard.Common/Origin.cs b/Dashboard.Common/Origin.cs
new file mode 100644
index 0000000..946cdcd
--- /dev/null
+++ b/Dashboard.Common/Origin.cs
@@ -0,0 +1,17 @@
+namespace Dashboard
+{
+    public enum Origin
+    {
+        Center = 0,
+
+        Left = (1 << 0),
+        Top = (1 << 1),
+        Right = (1 << 2),
+        Bottom = (1 << 3),
+
+        TopLeft = Top | Left,
+        BottomLeft = Bottom | Left,
+        BottomRight = Bottom | Right,
+        TopRight = Top | Right,
+    }
+}