Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Shared / MS / Internal / FloatUtil.cs / 1 / 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 : adsmith - Created this header // 05/20/2003 : adsmith - 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. //---------------------------------------------------------------------------- // // 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 : adsmith - Created this header // 05/20/2003 : adsmith - 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- CodeThrowExceptionStatement.cs
- ObjectListTitleAttribute.cs
- MobileCategoryAttribute.cs
- SByteStorage.cs
- DataObjectCopyingEventArgs.cs
- ResolveCriteriaCD1.cs
- MessageHeaderInfoTraceRecord.cs
- ChannelSinkStacks.cs
- AttributeEmitter.cs
- ComponentFactoryHelpers.cs
- RandomNumberGenerator.cs
- PowerModeChangedEventArgs.cs
- MouseButtonEventArgs.cs
- HttpCacheVaryByContentEncodings.cs
- MessageHeaderAttribute.cs
- TextSegment.cs
- BoundColumn.cs
- PreloadedPackages.cs
- RequestQueue.cs
- DriveNotFoundException.cs
- RawStylusActions.cs
- SqlCacheDependencyDatabase.cs
- RelationshipEndCollection.cs
- ThicknessAnimationUsingKeyFrames.cs
- SQLMoneyStorage.cs
- ResourcePart.cs
- FilteredDataSetHelper.cs
- RowToFieldTransformer.cs
- CollectionExtensions.cs
- GridToolTip.cs
- WebPartMinimizeVerb.cs
- TdsParser.cs
- ZipFileInfoCollection.cs
- ToolStripSeparator.cs
- storepermission.cs
- Operators.cs
- TimerElapsedEvenArgs.cs
- PasswordTextNavigator.cs
- odbcmetadatafactory.cs
- VariantWrapper.cs
- ListViewCommandEventArgs.cs
- Msec.cs
- CookielessHelper.cs
- DataExchangeServiceBinder.cs
- HelpKeywordAttribute.cs
- CodeMethodReturnStatement.cs
- CustomAttributeBuilder.cs
- TypeConstant.cs
- SoapHeaderAttribute.cs
- TextRangeAdaptor.cs
- ExecutedRoutedEventArgs.cs
- ReliabilityContractAttribute.cs
- EndOfStreamException.cs
- XmlSchemaSimpleTypeRestriction.cs
- ObjectPersistData.cs
- TextEffectCollection.cs
- FontInfo.cs
- CompositeCollectionView.cs
- UrlPath.cs
- DebugController.cs
- BoolExpressionVisitors.cs
- StickyNoteAnnotations.cs
- SafeRightsManagementEnvironmentHandle.cs
- Rfc4050KeyFormatter.cs
- BinaryNode.cs
- XmlArrayAttribute.cs
- TreeViewDesigner.cs
- UrlMappingsModule.cs
- GrammarBuilderRuleRef.cs
- XmlNamespaceManager.cs
- SystemException.cs
- EFAssociationProvider.cs
- Site.cs
- SelectionRange.cs
- ResourcePart.cs
- ServiceDefaults.cs
- HuffmanTree.cs
- HostedNamedPipeTransportManager.cs
- GenerateTemporaryTargetAssembly.cs
- XmlQuerySequence.cs
- ImageSourceValueSerializer.cs
- RootProfilePropertySettingsCollection.cs
- COM2EnumConverter.cs
- IPEndPointCollection.cs
- FormViewInsertEventArgs.cs
- LongValidator.cs
- EnvironmentPermission.cs
- OperationInvokerTrace.cs
- Sql8ConformanceChecker.cs
- QualifiedId.cs
- WebPartCatalogCloseVerb.cs
- ColorConverter.cs
- PopupRoot.cs
- InputScope.cs
- DataGridViewCellContextMenuStripNeededEventArgs.cs
- ScriptBehaviorDescriptor.cs
- DependencyPropertyChangedEventArgs.cs
- BrushConverter.cs
- ListViewDeleteEventArgs.cs
- CacheVirtualItemsEvent.cs