Catel - Part 4 of n: Unit testing with Catel

// --------------------------------------------------------------------------------------------------------------------
// <copyright file="Sizes.cs" company="Catel development team">
//   Copyright (c) 2008 - 2011 Catel development team. All rights reserved.
// </copyright>
// <summary>
//   Extension methods to calculate sizes.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

using System;

namespace Catel.Windows.Documents
{
    /// <summary>
    /// Extension methods to calculate sizes.
    /// </summary>
    public static class Sizes
    {
        /// <summary>
        /// Convert number of points to number of pixels.
        /// </summary>
        /// <param name="value">Number of points.</param>
        /// <returns>Number of pixels.</returns>
        public static double PointsToPixels(this double value)
        {
            return value * 96.0d / 72.0d;
        }

        /// <summary>
        /// Convert number of pixels to number of points.
        /// </summary>
        /// <param name="value">Number of pixels.</param>
        /// <returns>Number of points.</returns>
        public static double PixelsToPoints(this double value)
        {
            return Math.Round(value * 72.0 / 96.0);
        }
    }
}