Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Shapes / ellipse.cs / 1 / ellipse.cs
//---------------------------------------------------------------------------- // File: Ellipse.cs // // Description: // Implementation of Ellipse shape element. // // History: // 05/30/02 - [....] - Created. // // Copyright (C) 2003 by Microsoft Corporation. All rights reserved. // //--------------------------------------------------------------------------- using System.Windows.Shapes; using System.Diagnostics; using System.Windows.Threading; using System.Windows; using System.Windows.Media; using MS.Internal; using System.ComponentModel; using System; namespace System.Windows.Shapes { ////// The ellipse shape element /// This element (like all shapes) belongs under a Canvas, /// and will be presented by the parent canvas. /// ///public sealed class Ellipse : Shape { #region Constructors /// /// Instantiates a new instance of a Ellipse. /// ///public Ellipse() { } // The default stretch mode of Ellipse is Fill static Ellipse() { StretchProperty.OverrideMetadata(typeof(Ellipse), new FrameworkPropertyMetadata(Stretch.Fill)); } #endregion Constructors #region Dynamic Properties // For an Ellipse, RenderedGeometry = defining geometry and GeometryTransform = Identity /// /// The RenderedGeometry property returns the final rendered geometry /// public override Geometry RenderedGeometry { get { // RenderedGeometry = defining geometry return DefiningGeometry; } } ////// Return the transformation applied to the geometry before rendering /// public override Transform GeometryTransform { get { return Transform.Identity; } } #endregion Dynamic Properties #region Protected ////// Updates DesiredSize of the Ellipse. Called by parent UIElement. This is the first pass of layout. /// /// Constraint size is an "upper limit" that Ellipse should not exceed. ///Ellipse's desired size. protected override Size MeasureOverride(Size constraint) { if (Stretch == Stretch.UniformToFill) { double width = constraint.Width; double height = constraint.Height; if (Double.IsInfinity(width) && Double.IsInfinity(height)) { return GetNaturalSize(); } else if (Double.IsInfinity(width) || Double.IsInfinity(height)) { width = Math.Min(width, height); } else { width = Math.Max(width, height); } return new Size(width, width); } return GetNaturalSize(); } ////// Returns the final size of the shape and caches the bounds. /// protected override Size ArrangeOverride(Size finalSize) { // We construct the rectangle to fit finalSize with the appropriate Stretch mode. The rendering // transformation will thus be the identity. double penThickness = GetStrokeThickness(); double margin = penThickness / 2; _rect = new Rect( margin, // X margin, // Y Math.Max(0, finalSize.Width - penThickness), // Width Math.Max(0, finalSize.Height - penThickness)); // Height switch (Stretch) { case Stretch.None: // A 0 Rect.Width and Rect.Height rectangle _rect.Width = _rect.Height = 0; break; case Stretch.Fill: // The most common case: a rectangle that fills the box. // _rect has already been initialized for that. break; case Stretch.Uniform: // The maximal square that fits in the final box if (_rect.Width > _rect.Height) { _rect.Width = _rect.Height; } else // _rect.Width <= _rect.Height { _rect.Height = _rect.Width; } break; case Stretch.UniformToFill: // The minimal square that fills the final box if (_rect.Width < _rect.Height) { _rect.Width = _rect.Height; } else // _rect.Width >= _rect.Height { _rect.Height = _rect.Width; } break; } ResetRenderedGeometry(); return finalSize; } ////// Get the ellipse that defines this shape /// protected override Geometry DefiningGeometry { get { if (_rect.IsEmpty) { return Geometry.Empty; } return new EllipseGeometry(_rect); } } ////// Render callback. /// protected override void OnRender(DrawingContext drawingContext) { if (!_rect.IsEmpty) { Pen pen = GetPen(); drawingContext.DrawGeometry(Fill, pen, new EllipseGeometry(_rect)); } } #endregion Protected #region Internal Methods internal override void CacheDefiningGeometry() { double margin = GetStrokeThickness() / 2; _rect = new Rect(margin, margin, 0, 0); } ////// Get the natural size of the geometry that defines this shape /// internal override Size GetNaturalSize() { double strokeThickness = GetStrokeThickness(); return new Size(strokeThickness, strokeThickness); } ////// Get the bonds of the rectangle that defines this shape /// internal override Rect GetDefiningGeometryBounds() { return _rect; } // // This property // 1. Finds the correct initial size for the _effectiveValues store on the current DependencyObject // 2. This is a performance optimization // internal override int EffectiveValuesInitialSize { get { return 13; } } #endregion Internal Methods #region Private Fields private Rect _rect = Rect.Empty; #endregion Private Fields } } // 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
- EventHandlerList.cs
- InternalMappingException.cs
- BatchParser.cs
- NativeRecognizer.cs
- StringSource.cs
- WebPartVerbCollection.cs
- SoapEnumAttribute.cs
- CodeLinePragma.cs
- UIPropertyMetadata.cs
- SymmetricKeyWrap.cs
- ReversePositionQuery.cs
- AssociationType.cs
- ActiveXContainer.cs
- XNameConverter.cs
- HwndAppCommandInputProvider.cs
- SqlUserDefinedTypeAttribute.cs
- PathTooLongException.cs
- xml.cs
- AmbientLight.cs
- ListControl.cs
- ConfigurationElement.cs
- XmlSchemaCollection.cs
- DynamicResourceExtensionConverter.cs
- XmlEventCache.cs
- ColumnPropertiesGroup.cs
- ConsoleCancelEventArgs.cs
- CommonDialog.cs
- HtmlFormParameterReader.cs
- EtwTrace.cs
- NullPackagingPolicy.cs
- CopyEncoder.cs
- HtmlElement.cs
- ClipboardData.cs
- WindowHelperService.cs
- DataKey.cs
- MsmqIntegrationMessagePool.cs
- HandleCollector.cs
- XmlValidatingReaderImpl.cs
- relpropertyhelper.cs
- ITreeGenerator.cs
- Converter.cs
- RegexNode.cs
- PointHitTestResult.cs
- CookielessHelper.cs
- TcpTransportSecurity.cs
- Roles.cs
- DesignTimeTemplateParser.cs
- CompressionTracing.cs
- ServiceProviders.cs
- GlobalItem.cs
- DataGridRelationshipRow.cs
- HealthMonitoringSection.cs
- AstTree.cs
- StatusBarItemAutomationPeer.cs
- shaper.cs
- WhereQueryOperator.cs
- CultureInfoConverter.cs
- DelayedRegex.cs
- ZoneLinkButton.cs
- XmlValidatingReaderImpl.cs
- OptimizedTemplateContentHelper.cs
- ScriptingAuthenticationServiceSection.cs
- BatchStream.cs
- GridItemPatternIdentifiers.cs
- EncoderParameters.cs
- CodeMethodMap.cs
- PersonalizationState.cs
- OutputCacheProfile.cs
- WindowsGrip.cs
- ByteFacetDescriptionElement.cs
- OutOfMemoryException.cs
- TdsParser.cs
- FileDialogPermission.cs
- SctClaimSerializer.cs
- Literal.cs
- TranslateTransform.cs
- GeneralTransform3DTo2DTo3D.cs
- SelectedGridItemChangedEvent.cs
- ClientApiGenerator.cs
- LocationChangedEventArgs.cs
- BaseProcessor.cs
- DataTemplateSelector.cs
- FontResourceCache.cs
- baseaxisquery.cs
- MouseActionConverter.cs
- SoapSchemaImporter.cs
- AttachedPropertyBrowsableForChildrenAttribute.cs
- SoapHeaders.cs
- hresults.cs
- PrinterResolution.cs
- ExtensionQuery.cs
- PhoneCallDesigner.cs
- DataSourceCacheDurationConverter.cs
- WebPartTransformer.cs
- LinqDataSourceDeleteEventArgs.cs
- LocatorPart.cs
- EmptyEnumerable.cs
- XmlSchemaSubstitutionGroup.cs
- DESCryptoServiceProvider.cs
- SkinBuilder.cs