From ced3d03bdb3ce866d832e03fb212865140905a9a Mon Sep 17 00:00:00 2001
From: Thomas Leyh <leyh.thomas@web.de>
Date: Sun, 24 Jul 2016 08:14:18 +0200
Subject: Add project files.

---
 V3/Screens/FpsCounter.cs | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 V3/Screens/FpsCounter.cs

(limited to 'V3/Screens/FpsCounter.cs')

diff --git a/V3/Screens/FpsCounter.cs b/V3/Screens/FpsCounter.cs
new file mode 100644
index 0000000..5c3ac0c
--- /dev/null
+++ b/V3/Screens/FpsCounter.cs
@@ -0,0 +1,46 @@
+using System;
+using Microsoft.Xna.Framework;
+
+namespace V3.Screens
+{
+    /// <summary>
+    /// Counts the frames per second based on the elapsed time and the number
+    /// of frames that have been drawn.  Call Update in each Update, and
+    /// AddFrame in each Draw.
+    /// </summary>
+    public sealed class FpsCounter
+    {
+        /// <summary>
+        /// The current frames per second.
+        /// </summary>
+        public int Fps { get; private set; }
+
+        private int mFrameCount;
+        private TimeSpan mTimeSpan = TimeSpan.Zero;
+
+        /// <summary>
+        /// Updates the elapsed time and -- once every second -- the fps value.
+        /// </summary>
+        /// <param name="gameTime">the elapsed game time</param>
+        public void Update(GameTime gameTime)
+        {
+            mTimeSpan += gameTime.ElapsedGameTime;
+
+            if (mTimeSpan > TimeSpan.FromSeconds(1))
+            {
+                mTimeSpan -= TimeSpan.FromSeconds(1);
+                Fps = mFrameCount;
+                mFrameCount = 0;
+            }
+        }
+
+        /// <summary>
+        /// Registers that a frame has been drawn. Should be called once for
+        /// every Draw.
+        /// </summary>
+        public void AddFrame()
+        {
+            mFrameCount++;
+        }
+    }
+}
-- 
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