BoundingBox

CSMath/BoundingBox.cs

@@ -1,10 +1,24 @@
-namespace CSMath
+using System.Collections.Generic;
+
+namespace CSMath
 {
 	/// <summary>
 	/// Bounding box representation aligned to XYZ axis.
 	/// </summary>
 	public struct BoundingBox
 	{
+		/// <summary>
+		/// Instance of a null bounding box.
+		/// </summary>
+		public static readonly BoundingBox Null = new BoundingBox(BoundingBoxExtent.Null);
+
+		/// <summary>
+		/// Instance of an infinite bounding box.
+		/// </summary>
+		public static readonly BoundingBox Infinite = new BoundingBox(BoundingBoxExtent.Infinite);
+
+		public BoundingBoxExtent Extent { get; }
+
 		/// <summary>
 		/// Get the min corner of the bounding box.
 		/// </summary>
@@ -26,13 +40,34 @@ public XYZ Center
 			}
 		}
 
+		private BoundingBox(BoundingBoxExtent extent)
+		{
+			this.Extent = extent;
+		}
+
+		public BoundingBox(XYZ point)
+		{
+			this.Extent = BoundingBoxExtent.Point;
+			this.Min = point;
+			this.Max = point;
+		}
+
 		/// <summary>
 		/// Bounding box constructor with 2 points.
 		/// </summary>
 		/// <param name="min"></param>
 		/// <param name="max"></param>
 		public BoundingBox(XYZ min, XYZ max)
 		{
+			if (min == max)
+			{
+				this.Extent = BoundingBoxExtent.Point;
+			}
+			else
+			{
+				this.Extent = BoundingBoxExtent.Finite;
+			}
+
 			this.Min = new XYZ(System.Math.Min(min.X, max.X), System.Math.Min(min.Y, max.Y), System.Math.Min(min.Z, max.Z));
 			this.Max = new XYZ(System.Math.Max(min.X, max.X), System.Math.Max(min.Y, max.Y), System.Math.Max(min.Z, max.Z));
 		}
@@ -69,5 +104,22 @@ public BoundingBox Merge(BoundingBox box)
 
 			return new BoundingBox(min, max);
 		}
+
+		/// <summary>
+		/// Create a bounding box from a collection of points.
+		/// </summary>
+		/// <param name="points"></param>
+		/// <returns></returns>
+		public static BoundingBox FromPoints(IEnumerable<XYZ> points)
+		{
+			BoundingBox boundingBox = Null;
+
+			foreach (var point in points)
+			{
+				boundingBox = boundingBox.Merge(new BoundingBox(point));
+			}
+
+			return boundingBox;
+		}
 	}
 }

CSMath/BoundingBoxExtent.cs

@@ -0,0 +1,10 @@
+namespace CSMath
+{
+	public enum BoundingBoxExtent
+	{
+		Null,
+		Finite,
+		Infinite,
+		Point
+	}
+}

CSMath/CSMath.projitems

@@ -10,6 +10,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="$(MSBuildThisFileDirectory)BoundingBox.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)BoundingBoxExtent.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Geometry\ILine.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Geometry\Line3D.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Geometry\LineExtensions.cs" />