Beginnings of cursor support.

OpenRa.Game/Graphics/CursorSequence.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Xml;
+
+namespace OpenRa.Game.Graphics
+{
+	class CursorSequence
+	{
+		readonly int start, length;
+
+		public int Start { get { return start; } }
+		public int End { get { return start + length; } }
+		public int Length { get { return length; } }
+
+		Sprite[] sprites;
+		public CursorSequence(string cursorSrc, XmlElement e)
+		{
+			sprites = CursorSheetBuilder.LoadAllSprites(cursorSrc, ".shp");
+			
+			start = int.Parse(e.GetAttribute("start"));
+
+			if (e.GetAttribute("length") == "*" || e.GetAttribute("end") == "*")
+				length = sprites.Length - start;
+			else if (e.HasAttribute("length"))
+				length = int.Parse(e.GetAttribute("length"));
+			else if (e.HasAttribute("end"))
+				length = int.Parse(e.GetAttribute("end")) - start;
+			else
+				length = 1;
+		}
+
+		public Sprite GetSprite(int frame)
+		{
+			return sprites[(frame % length) + start];
+		}
+	}
+}