RevitSdkSamples/SDK/Samples/CurtainWallGrid/CS/Unit.cs

//
// (C) Copyright 2003-2019 by Autodesk, Inc.
//
// Permission to use, copy, modify, and distribute this software in
// object code form for any purpose and without fee is hereby granted,
// provided that the above copyright notice appears in all copies and
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// documentation.
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// restrictions set forth in FAR 52.227-19 (Commercial Computer
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using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.Reflection;

using Autodesk.Revit;
using Autodesk.Revit.DB;

namespace Revit.SDK.Samples.CurtainWallGrid.CS
{
   /// <summary>
   /// Provides static functions to convert unit
   /// </summary>
   static class Unit
   {
      #region Methods
      /// <summary>
      /// Convert the value get from RevitAPI to the value indicated by DisplayUnitType
      /// </summary>
      /// <param name="to">
      /// DisplayUnitType indicates unit of target value
      /// </param>
      /// <param name="value">
      /// value get from RevitAPI
      /// </param>
      /// <returns>
      /// Target value
      /// </returns>
      public static double CovertFromAPI(DisplayUnitType to, double value)
      {
         return value *= ImperialDutRatio(to);
      }

      /// <summary>
      /// Convert a value indicated by DisplayUnitType to the value used by RevitAPI
      /// </summary>
      /// <param name="value">
      /// Value to be converted
      /// </param>
      /// <param name="from">
      /// DisplayUnitType indicates the unit of the value to be converted
      /// </param>
      /// <returns>
      /// Target value
      /// </returns>
      public static double CovertToAPI(double value, DisplayUnitType from)
      {
         return value /= ImperialDutRatio(from);
      }

      /// <summary>
      /// Get ratio between value in RevitAPI and value to display indicated by DisplayUnitType
      /// </summary>
      /// <param name="dut">
      /// DisplayUnitType indicates display unit type
      /// </param>
      /// <returns>
      /// Ratio 
      /// </returns>
      private static double ImperialDutRatio(DisplayUnitType dut)
      {
         switch (dut)
         {
            case DisplayUnitType.DUT_DECIMAL_FEET: return 1;
            case DisplayUnitType.DUT_FEET_FRACTIONAL_INCHES: return 1;
            case DisplayUnitType.DUT_DECIMAL_INCHES: return 12;
            case DisplayUnitType.DUT_FRACTIONAL_INCHES: return 12;
            case DisplayUnitType.DUT_METERS: return 0.3048;
            case DisplayUnitType.DUT_CENTIMETERS: return 30.48;
            case DisplayUnitType.DUT_MILLIMETERS: return 304.8;
            case DisplayUnitType.DUT_METERS_CENTIMETERS: return 0.3048;
            default: return 1;
         }
      }
      #endregion
   }
}