1 files changed, 112 insertions, 0 deletions
diff --git a/src/Noddybox.Emulation/Clock.cs b/src/Noddybox.Emulation/Clock.cs
new file mode 100644
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+++ b/src/Noddybox.Emulation/Clock.cs
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+//
+// Copyright (c) 2012 Ian Cowburn
+//
+using System;
+using System.Net;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+using System.Windows.Ink;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Shapes;
+
+namespace Noddybox.Emulation
+{
+    /// <summary>
+    /// Provides a basic clock implementation that is geared towards the VBL.
+    /// </summary>
+    public class Clock
+    {
+        #region Private fields
+
+        private uint    perSecond;
+        private uint    perFrame;
+        private uint    perLine;
+        private uint    frameCount;
+
+        #endregion
+
+        #region Public properties
+
+        /// <summary>
+        /// Returns true if the frame has finished.
+        /// </summary>
+        public bool FrameDone
+        {
+            get
+            {
+                return frameCount > perFrame;
+            }
+        }
+
+        /// <summary>
+        /// Returns the current raster line.
+        /// </summary>
+        public uint RasterLine
+        {
+            get
+            {
+                return frameCount / perLine;
+            }
+        }
+
+        #endregion
+
+        #region Public members
+
+        /// <summary>
+        /// Starts a new frame.
+        /// </summary>
+        public void StartFrame()
+        {
+            if (FrameDone)
+            {
+                frameCount -= perFrame;
+            }
+        }
+
+        /// <summary>
+        /// Adds a number of ticks to the clock.
+        /// </summary>
+        /// <param name="ticks">The ticks to add.</param>
+        public void Add(uint ticks)
+        {
+            frameCount += ticks;
+        }
+
+        #endregion
+
+        #region Constructors
+
+        /// <summary>
+        /// Defines a clock.
+        /// </summary>
+        /// <param name="ticksPerSecond">The number of ticks per second.</param>
+        /// <param name="framesPerSecond">The number of frames per second.</param>
+        public Clock(uint ticksPerSecond, uint framesPerSecond)
+        {
+            this.perSecond = ticksPerSecond;
+            this.perFrame = ticksPerSecond / framesPerSecond;
+            this.perLine = 1;
+            this.frameCount = 0;
+        }
+
+        /// <summary>
+        /// Defines a clock.
+        /// </summary>
+        /// <param name="ticksPerSecond">The number of ticks per second.</param>
+        /// <param name="framesPerSecond">The number of frames per second.</param>
+        /// <param name="ticksPerLine">The number of clock ticks per raster line.</param>
+        public Clock(uint ticksPerSecond, uint framesPerSecond, uint ticksPerLine)
+        {
+            this.perSecond = ticksPerSecond;
+            this.perFrame = ticksPerSecond / framesPerSecond;
+            this.perLine = ticksPerLine;
+            this.frameCount = 0;
+        }
+
+        #endregion
+    }
+}