Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Shared / MS / Internal / FloatUtil.cs / 1305600 / FloatUtil.cs
//---------------------------------------------------------------------------- // // Copyright (C) Microsoft Corporation. All rights reserved. // // File: FloatUtil.cs // // Description: This file contains the implementation of FloatUtil, which // provides "fuzzy" comparison functionality for floats and // float-based classes and structs in our code. // // History: // 04/28/2003 : [....] - Created this header // 05/20/2003 : [....] - Move to Shared. // //--------------------------------------------------------------------------- using System; namespace MS.Internal { internal static class FloatUtil { internal static float FLT_EPSILON = 1.192092896e-07F; internal static float FLT_MAX_PRECISION = 0xffffff; internal static float INVERSE_FLT_MAX_PRECISION = 1.0F / FLT_MAX_PRECISION; ////// AreClose /// public static bool AreClose(float a, float b) { if(a == b) return true; // This computes (|a-b| / (|a| + |b| + 10.0f)) < FLT_EPSILON float eps = ((float)Math.Abs(a) + (float)Math.Abs(b) + 10.0f) * FLT_EPSILON; float delta = a - b; return(-eps < delta) && (eps > delta); } ////// IsOne /// public static bool IsOne(float a) { return (float)Math.Abs(a-1.0f) < 10.0f * FLT_EPSILON; } ////// IsZero /// public static bool IsZero(float a) { return (float)Math.Abs(a) < 10.0f * FLT_EPSILON; } ////// IsCloseToDivideByZero /// public static bool IsCloseToDivideByZero(float numerator, float denominator) { // When updating this, please also update code in Arithmetic.h return Math.Abs(denominator) <= Math.Abs(numerator) * INVERSE_FLT_MAX_PRECISION; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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