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VideoBrowser/Extensions/RangeExtension.cs

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+namespace VideoBrowser.Extensions
+{
+    using VideoBrowser.Common;
+
+    /// <summary>
+    /// Defines the <see cref="RangeExtension" />
+    /// </summary>
+    public static class RangeExtension
+    {
+        #region Methods
+
+        /// <summary>
+        /// The Center
+        /// </summary>
+        /// <param name="range">The range<see cref="RangeDouble"/></param>
+        /// <returns>The <see cref="double"/></returns>
+        public static double Center(this RangeDouble range)
+        {
+            var center = range.Start + range.Length() * 0.5;
+            return center;
+        }
+
+        /// <summary>
+        /// The Contains
+        /// </summary>
+        /// <param name="container">The container<see cref="RangeDouble"/></param>
+        /// <param name="range">The range<see cref="RangeDouble"/></param>
+        /// <returns>The <see cref="bool"/></returns>
+        public static bool Contains(this RangeDouble container, RangeDouble range)
+        {
+            var contains = range.Start.IsInRange(container.Start, container.End) && range.End.IsInRange(container.Start, container.End);
+            return contains;
+        }
+
+        /// <summary>
+        /// The Contains
+        /// </summary>
+        /// <param name="container">The container<see cref="RangeInt"/></param>
+        /// <param name="range">The range<see cref="RangeInt"/></param>
+        /// <returns>The <see cref="bool"/></returns>
+        public static bool Contains(this RangeInt container, RangeInt range)
+        {
+            var contains = range.Start.IsInRange(container.Start, container.End) && range.End.IsInRange(container.Start, container.End);
+            return contains;
+        }
+
+        /// <summary>
+        /// The IsEmpty
+        /// </summary>
+        /// <param name="range">The range<see cref="RangeDouble"/></param>
+        /// <returns>The <see cref="bool"/></returns>
+        public static bool IsEmpty(this RangeDouble range)
+        {
+            var isEmpty = range.Start.IsZero() && range.End.IsZero();
+            return isEmpty;
+        }
+
+        /// <summary>
+        /// Determines whether [is in range] [the specified minimum].
+        /// </summary>
+        /// <param name="value">The value.</param>
+        /// <param name="min">The minimum.</param>
+        /// <param name="max">The maximum.</param>
+        /// <returns>The <see cref="bool"/></returns>
+        public static bool IsInRange(this double value, double min, double max)
+        {
+            return (min < max) ? value >= min && value <= max : value >= max && value <= min;
+        }
+
+        /// <summary>
+        /// The IsInRange
+        /// </summary>
+        /// <param name="value">The value<see cref="int"/></param>
+        /// <param name="min">The min<see cref="int"/></param>
+        /// <param name="max">The max<see cref="int"/></param>
+        /// <returns>The <see cref="bool"/></returns>
+        public static bool IsInRange(this int value, int min, int max)
+        {
+            return (min < max) ? value >= min && value <= max : value >= max && value <= min;
+        }
+
+        /// <summary>
+        /// Lengthes the specified range.
+        /// </summary>
+        /// <param name="range">The range.</param>
+        /// <returns>The length in double.</returns>
+        public static double Length(this RangeDouble range)
+        {
+            return range.End - range.Start;
+        }
+
+        /// <summary>
+        /// The Length
+        /// </summary>
+        /// <param name="range">The range<see cref="RangeInt"/></param>
+        /// <returns>The <see cref="int"/></returns>
+        public static int Length(this RangeInt range)
+        {
+            return range.End - range.Start;
+        }
+
+        /// <summary>
+        /// The MoveInsideContainer
+        /// </summary>
+        /// <param name="range">The range<see cref="RangeDouble"/></param>
+        /// <param name="container">The container<see cref="RangeDouble"/></param>
+        /// <returns>The <see cref="RangeDouble"/></returns>
+        public static RangeDouble MoveInsideContainer(this RangeDouble range, RangeDouble container)
+        {
+            if (container.Contains(range))
+            {
+                return range;
+            }
+
+            var length = range.Length();
+            if (length > container.Length())
+            {
+                length = container.Length();
+            }
+
+            var rangeInside = range.Start < container.Start ? new RangeDouble(container.Start, container.Start + length) : new RangeDouble(container.End - length, container.End);
+            return rangeInside;
+        }
+
+        /// <summary>
+        /// The Offset the range to the specified distance.
+        /// </summary>
+        /// <param name="range">The range<see cref="RangeDouble"/></param>
+        /// <param name="distance">The distance<see cref="double"/></param>
+        /// <param name="extentRange">The extentRange<see cref="RangeDouble"/></param>
+        /// <returns>The <see cref="RangeDouble"/></returns>
+        public static RangeDouble Offset(this RangeDouble range, double distance, RangeDouble extentRange)
+        {
+            var length = range.Length();
+            if (extentRange.Length() < length)
+            {
+                length = extentRange.Length();
+            }
+
+            var start = range.Start + distance;
+            var end = start + length;
+            var newRange = new RangeDouble(start, end);
+            if (extentRange.Contains(newRange))
+            {
+                return newRange;
+            }
+
+            return start < extentRange.Start
+                ? new RangeDouble(extentRange.Start, extentRange.Start + length)
+                : new RangeDouble(extentRange.End - length, extentRange.End);
+        }
+
+        #endregion Methods
+    }
+}