Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / System / Windows / Media / ImageDrawing.cs / 1 / ImageDrawing.cs
//---------------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // Description: ImageDrawing represents a drawing operation that renders // an image into a destination rectangle. // // History: // // 2004/11/17 : timothyc - Created it. // //--------------------------------------------------------------------------- using System.Diagnostics; using System.Windows.Media.Imaging; using MS.Internal; namespace System.Windows.Media { ////// ImageDrawing represents a drawing operation that renders an image into /// a destination rectangle /// public sealed partial class ImageDrawing : Drawing { #region Constructors ////// Default ImageDrawing constructor. /// Constructs an object with all properties set to their default values /// public ImageDrawing() { } ////// Two-argument ImageDrawing constructor. /// Constructs an object with the ImageSource and Rect properties /// set to the value of their respective arguments. /// public ImageDrawing(ImageSource imageSource, Rect rect) { ImageSource = imageSource; Rect = rect; } #endregion #region Internal methods ////// Calls methods on the DrawingContext that are equivalent to the /// Drawing with the Drawing's current value. /// internal override void WalkCurrentValue(DrawingContextWalker ctx) { // We avoid unneccessary ShouldStopWalking checks based on assumptions // about when ShouldStopWalking is set. Guard that assumption with an // assertion. See DrawingGroup.WalkCurrentValue comment for more details. ctx.DrawImage( ImageSource, Rect ); } ////// Image drawings require realization updates if the image source is a DrawingImage. /// internal override void PrecomputeCore() { ImageSource source = ImageSource; if (source != null) { source.Precompute(); RequiresRealizationUpdates = source.RequiresRealizationUpdates; } else { RequiresRealizationUpdates = false; } } ////// Pushes realization updates into DrawingImage ImageSources. /// internal override void UpdateRealizations(RealizationContext realizationContext) { if (RequiresRealizationUpdates) { ImageSource imageSource = ImageSource; Debug.Assert(imageSource != null, "Otherwise RequiresRealizationUpdates would be false."); Rect rectangle = Rect; Size imageSize = imageSource.Size; if (!DoubleUtil.AreClose(imageSize.Width, 0) && !DoubleUtil.AreClose(imageSize.Height, 0)) { Matrix scale = Matrix.CreateScaling( rectangle.Width / imageSize.Width, rectangle.Height / imageSize.Height); realizationContext.TransformStack.Push(ref scale, true); imageSource.UpdateRealizations(realizationContext); realizationContext.TransformStack.Pop(); } } } #endregion Internal methods } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //---------------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // Description: ImageDrawing represents a drawing operation that renders // an image into a destination rectangle. // // History: // // 2004/11/17 : timothyc - Created it. // //--------------------------------------------------------------------------- using System.Diagnostics; using System.Windows.Media.Imaging; using MS.Internal; namespace System.Windows.Media { ////// ImageDrawing represents a drawing operation that renders an image into /// a destination rectangle /// public sealed partial class ImageDrawing : Drawing { #region Constructors ////// Default ImageDrawing constructor. /// Constructs an object with all properties set to their default values /// public ImageDrawing() { } ////// Two-argument ImageDrawing constructor. /// Constructs an object with the ImageSource and Rect properties /// set to the value of their respective arguments. /// public ImageDrawing(ImageSource imageSource, Rect rect) { ImageSource = imageSource; Rect = rect; } #endregion #region Internal methods ////// Calls methods on the DrawingContext that are equivalent to the /// Drawing with the Drawing's current value. /// internal override void WalkCurrentValue(DrawingContextWalker ctx) { // We avoid unneccessary ShouldStopWalking checks based on assumptions // about when ShouldStopWalking is set. Guard that assumption with an // assertion. See DrawingGroup.WalkCurrentValue comment for more details. ctx.DrawImage( ImageSource, Rect ); } ////// Image drawings require realization updates if the image source is a DrawingImage. /// internal override void PrecomputeCore() { ImageSource source = ImageSource; if (source != null) { source.Precompute(); RequiresRealizationUpdates = source.RequiresRealizationUpdates; } else { RequiresRealizationUpdates = false; } } ////// Pushes realization updates into DrawingImage ImageSources. /// internal override void UpdateRealizations(RealizationContext realizationContext) { if (RequiresRealizationUpdates) { ImageSource imageSource = ImageSource; Debug.Assert(imageSource != null, "Otherwise RequiresRealizationUpdates would be false."); Rect rectangle = Rect; Size imageSize = imageSource.Size; if (!DoubleUtil.AreClose(imageSize.Width, 0) && !DoubleUtil.AreClose(imageSize.Height, 0)) { Matrix scale = Matrix.CreateScaling( rectangle.Width / imageSize.Width, rectangle.Height / imageSize.Height); realizationContext.TransformStack.Push(ref scale, true); imageSource.UpdateRealizations(realizationContext); realizationContext.TransformStack.Pop(); } } } #endregion Internal methods } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- CompilerErrorCollection.cs
- Trigger.cs
- UInt64Converter.cs
- SafeArrayRankMismatchException.cs
- ClientBuildManagerCallback.cs
- InstanceDataCollectionCollection.cs
- Pair.cs
- TrustSection.cs
- PropertyBuilder.cs
- KeyInfo.cs
- Comparer.cs
- ControlDesignerState.cs
- BlurBitmapEffect.cs
- StringHandle.cs
- ComponentManagerBroker.cs
- OrthographicCamera.cs
- BufferBuilder.cs
- ScaleTransform3D.cs
- CaseStatement.cs
- XsdDuration.cs
- SymbolType.cs
- DataGridViewRowHeightInfoNeededEventArgs.cs
- Evaluator.cs
- StateBag.cs
- PrinterResolution.cs
- TaskFactory.cs
- PageBuildProvider.cs
- DoubleConverter.cs
- PointF.cs
- TypeSystemProvider.cs
- DateTimeFormatInfo.cs
- MetaModel.cs
- CopyOfAction.cs
- ToggleButtonAutomationPeer.cs
- TemplatePagerField.cs
- BrowsableAttribute.cs
- ProfileModule.cs
- SimpleFileLog.cs
- RuntimeDelegateArgument.cs
- NullableConverter.cs
- DesignerSerializationOptionsAttribute.cs
- oledbconnectionstring.cs
- TableRowCollection.cs
- CustomAttributeFormatException.cs
- GridPattern.cs
- TextSimpleMarkerProperties.cs
- WebServiceHandlerFactory.cs
- Type.cs
- ConfigurationValue.cs
- SharedUtils.cs
- MenuItem.cs
- InvalidOperationException.cs
- SweepDirectionValidation.cs
- DiagnosticsConfigurationHandler.cs
- MatrixCamera.cs
- CodeObject.cs
- SqlVersion.cs
- jithelpers.cs
- PathGeometry.cs
- NCryptSafeHandles.cs
- RequestCachePolicy.cs
- SystemKeyConverter.cs
- RelationshipEnd.cs
- ActivityExecutionContext.cs
- MapPathBasedVirtualPathProvider.cs
- CertificateManager.cs
- GridLengthConverter.cs
- CrossSiteScriptingValidation.cs
- KeyTimeConverter.cs
- SymbolEqualComparer.cs
- Thumb.cs
- ColorConverter.cs
- InputLangChangeRequestEvent.cs
- TransformPatternIdentifiers.cs
- SmiMetaDataProperty.cs
- FormatSettings.cs
- QueryContinueDragEvent.cs
- EnumerationRangeValidationUtil.cs
- EventSetterHandlerConverter.cs
- ImmutableCollection.cs
- CSharpCodeProvider.cs
- BCryptSafeHandles.cs
- PersonalizableAttribute.cs
- SoapSchemaMember.cs
- MarginsConverter.cs
- TCEAdapterGenerator.cs
- RegionIterator.cs
- SHA256Managed.cs
- VisualStateChangedEventArgs.cs
- XmlSchemaAttributeGroup.cs
- SearchForVirtualItemEventArgs.cs
- WizardStepBase.cs
- EventToken.cs
- TrackBar.cs
- ResourceAssociationTypeEnd.cs
- ButtonBaseAdapter.cs
- ReferenceEqualityComparer.cs
- Substitution.cs
- RenderingBiasValidation.cs
- PropertyReferenceSerializer.cs