Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / System / Windows / Media / EllipseGeometry.cs / 1 / EllipseGeometry.cs
//------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, 2001 // // File: EllipseGeometry.cs //----------------------------------------------------------------------------- using System; using MS.Internal; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Reflection; using System.Collections; using System.Text; using System.Globalization; using System.Windows.Media; using System.Windows.Media.Composition; using System.Windows; using System.Text.RegularExpressions; using System.Windows.Media.Animation; using System.Diagnostics; using System.Runtime.InteropServices; using System.Security; using System.Security.Permissions; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; namespace System.Windows.Media { ////// This is the Geometry class for Circles and Ellipses /// public sealed partial class EllipseGeometry : Geometry { #region Constructors ////// /// public EllipseGeometry() { } ////// Constructor - sets the ellipse to the paramters with the given transformation /// public EllipseGeometry(Rect rect) { if (rect.IsEmpty) { throw new System.ArgumentException(SR.Get(SRID.Rect_Empty, "rect")); } RadiusX = (rect.Right - rect.X) * (1.0 / 2.0); RadiusY = (rect.Bottom - rect.Y) * (1.0 / 2.0); Center = new Point(rect.X + RadiusX, rect.Y + RadiusY); } ////// Constructor - sets the ellipse to the parameters /// public EllipseGeometry( Point center, double radiusX, double radiusY) { Center = center; RadiusX = radiusX; RadiusY = radiusY; } ////// Constructor - sets the ellipse to the parameters /// public EllipseGeometry( Point center, double radiusX, double radiusY, Transform transform) : this(center, radiusX, radiusY) { Transform = transform; } #endregion ////// Gets the bounds of this Geometry as an axis-aligned bounding box /// public override Rect Bounds { get { ReadPreamble(); Rect boundsRect; Transform transform = Transform; if (transform == null || transform.IsIdentity) { Point currentCenter = Center; Double currentRadiusX = RadiusX; Double currentRadiusY = RadiusY; boundsRect = new Rect( currentCenter.X - Math.Abs(currentRadiusX), currentCenter.Y - Math.Abs(currentRadiusY), 2.0 * Math.Abs(currentRadiusX), 2.0 * Math.Abs(currentRadiusY)); } else { // // Matrix geometryMatrix; Transform.GetTransformValue(transform, out geometryMatrix); boundsRect = EllipseGeometry.GetBoundsHelper( null /* no pen */, Matrix.Identity, Center, RadiusX, RadiusY, geometryMatrix, StandardFlatteningTolerance, ToleranceType.Absolute); } return boundsRect; } } ////// Returns the axis-aligned bounding rectangle when stroked with a pen, after applying /// the supplied transform (if non-null). /// internal override Rect GetBoundsInternal(Pen pen, Matrix matrix, double tolerance, ToleranceType type) { Matrix geometryMatrix; Transform.GetTransformValue(Transform, out geometryMatrix); return EllipseGeometry.GetBoundsHelper( pen, matrix, Center, RadiusX, RadiusY, geometryMatrix, tolerance, type); } ////// Critical - it calls a critical method, Geometry.GetBoundsHelper and has an unsafe block /// TreatAsSafe - returning an EllipseGeometry's bounds is considered safe /// [SecurityCritical, SecurityTreatAsSafe] internal static Rect GetBoundsHelper(Pen pen, Matrix worldMatrix, Point center, double radiusX, double radiusY, Matrix geometryMatrix, double tolerance, ToleranceType type) { Rect rect; Debug.Assert(worldMatrix != null); Debug.Assert(geometryMatrix != null); if ( (pen == null || pen.DoesNotContainGaps) && worldMatrix.IsIdentity && geometryMatrix.IsIdentity) { double strokeThickness = 0.0; if (Pen.ContributesToBounds(pen)) { strokeThickness = Math.Abs(pen.Thickness); } rect = new Rect( center.X - Math.Abs(radiusX)-0.5*strokeThickness, center.Y - Math.Abs(radiusY)-0.5*strokeThickness, 2.0 * Math.Abs(radiusX)+strokeThickness, 2.0 * Math.Abs(radiusY)+strokeThickness); } else { unsafe { Point * pPoints = stackalloc Point[(int)c_pointCount]; EllipseGeometry.GetPointList(pPoints, c_pointCount, center, radiusX, radiusY); fixed (byte *pTypes = EllipseGeometry.s_roundedPathTypes) { rect = Geometry.GetBoundsHelper( pen, &worldMatrix, pPoints, pTypes, c_pointCount, c_segmentCount, &geometryMatrix, tolerance, type, false); // skip hollows - meaningless here, this is never a hollow } } } return rect; } ////// Critical - contains unsafe block and calls critical method Geometry.ContainsInternal. /// TreatAsSafe - as this doesn't expose anything sensitive. /// [SecurityCritical, SecurityTreatAsSafe] internal override bool ContainsInternal(Pen pen, Point hitPoint, double tolerance, ToleranceType type) { unsafe { Point *pPoints = stackalloc Point[(int)GetPointCount()]; EllipseGeometry.GetPointList(pPoints, GetPointCount(), Center, RadiusX, RadiusY); fixed (byte* pTypes = GetTypeList()) { return ContainsInternal( pen, hitPoint, tolerance, type, pPoints, GetPointCount(), pTypes, GetSegmentCount()); } } } #region Public Methods ////// Returns true if this geometry is empty /// public override bool IsEmpty() { return false; } ////// Returns true if this geometry may have curved segments /// public override bool MayHaveCurves() { return true; } ////// Gets the area of this geometry /// /// The computational error tolerance /// The way the error tolerance will be interpreted - realtive or absolute public override double GetArea(double tolerance, ToleranceType type) { ReadPreamble(); double area = Math.Abs(RadiusX * RadiusY) * Math.PI; // Adjust to internal transformation Transform transform = Transform; if (transform != null && !transform.IsIdentity) { area *= Math.Abs(transform.Value.Determinant); } return area; } #endregion Public Methods internal override PathFigureCollection GetTransformedFigureCollection(Transform transform) { Point [] points = GetPointList(); // Get the combined transform argument with the internal transform Matrix matrix = GetCombinedMatrix(transform); if (!matrix.IsIdentity) { for (int i=0; i/// GetAsPathGeometry - return a PathGeometry version of this Geometry /// internal override PathGeometry GetAsPathGeometry() { PathStreamGeometryContext ctx = new PathStreamGeometryContext(FillRule.EvenOdd, Transform); PathGeometry.ParsePathGeometryData(GetPathGeometryData(), ctx); return ctx.GetPathGeometry(); } /// /// GetPathGeometryData - returns a byte[] which contains this Geometry represented /// as a path geometry's serialized format. /// internal override PathGeometryData GetPathGeometryData() { if (IsObviouslyEmpty()) { return Geometry.GetEmptyPathGeometryData(); } PathGeometryData data = new PathGeometryData(); data.FillRule = FillRule.EvenOdd; data.Matrix = CompositionResourceManager.TransformToMilMatrix3x2D(Transform); Point[] points = GetPointList(); ByteStreamGeometryContext ctx = new ByteStreamGeometryContext(); ctx.BeginFigure(points[0], true /* is filled */, true /* is closed */); // i == 0, 3, 6, 9 for (int i = 0; i < 12; i += 3) { ctx.BezierTo(points[i + 1], points[i + 2], points[i + 3], true /* is stroked */, true /* is smooth join */); } ctx.Close(); data.SerializedData = ctx.GetData(); return data; } ////// ////// /// Critical - Calls critical code /// TreatAsSafe - returning a EllipseGeometry's point list is considered safe /// [SecurityCritical, SecurityTreatAsSafe] private Point[] GetPointList() { Point[] points = new Point[GetPointCount()]; unsafe { fixed(Point *pPoints = points) { EllipseGeometry.GetPointList(pPoints, GetPointCount(), Center, RadiusX, RadiusY); } } return points; } ////// Critical - Accepts pointer arguments /// [SecurityCritical] private unsafe static void GetPointList(Point * points, uint pointsCount, Point center, double radiusX, double radiusY) { Invariant.Assert(pointsCount >= c_pointCount); radiusX = Math.Abs(radiusX); radiusY = Math.Abs(radiusY); // Set the X coordinates double mid = radiusX * c_arcAsBezier; points[0].X = points[1].X = points[11].X = points[12].X = center.X + radiusX; points[2].X = points[10].X = center.X + mid; points[3].X = points[9].X = center.X; points[4].X = points[8].X = center.X - mid; points[5].X = points[6].X = points[7].X = center.X - radiusX; // Set the Y coordinates mid = radiusY * c_arcAsBezier; points[2].Y = points[3].Y = points[4].Y = center.Y + radiusY; points[1].Y = points[5].Y = center.Y + mid; points[0].Y = points[6].Y = points[12].Y = center.Y; points[7].Y = points[11].Y = center.Y - mid; points[8].Y = points[9].Y = points[10].Y = center.Y - radiusY; } private byte[] GetTypeList() { return s_roundedPathTypes; } private uint GetPointCount() { return c_pointCount; } private uint GetSegmentCount() { return c_segmentCount; } #region Static Data // Approximating a 1/4 circle with a Bezier curve _ internal const double c_arcAsBezier = 0.5522847498307933984; // =( \/2 - 1)*4/3 private const UInt32 c_segmentCount = 4; private const UInt32 c_pointCount = 13; private const byte c_smoothBezier = (byte)MILCoreSegFlags.SegTypeBezier | (byte)MILCoreSegFlags.SegIsCurved | (byte)MILCoreSegFlags.SegSmoothJoin; private static readonly byte[] s_roundedPathTypes = { (byte)MILCoreSegFlags.SegTypeBezier | (byte)MILCoreSegFlags.SegIsCurved | (byte)MILCoreSegFlags.SegSmoothJoin | (byte)MILCoreSegFlags.SegClosed, c_smoothBezier, c_smoothBezier, c_smoothBezier }; #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //------------------------------------------------------------------------------ // Microsoft Avalon // Copyright (c) Microsoft Corporation, 2001 // // File: EllipseGeometry.cs //----------------------------------------------------------------------------- using System; using MS.Internal; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Reflection; using System.Collections; using System.Text; using System.Globalization; using System.Windows.Media; using System.Windows.Media.Composition; using System.Windows; using System.Text.RegularExpressions; using System.Windows.Media.Animation; using System.Diagnostics; using System.Runtime.InteropServices; using System.Security; using System.Security.Permissions; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; namespace System.Windows.Media { ////// This is the Geometry class for Circles and Ellipses /// public sealed partial class EllipseGeometry : Geometry { #region Constructors ////// /// public EllipseGeometry() { } ////// Constructor - sets the ellipse to the paramters with the given transformation /// public EllipseGeometry(Rect rect) { if (rect.IsEmpty) { throw new System.ArgumentException(SR.Get(SRID.Rect_Empty, "rect")); } RadiusX = (rect.Right - rect.X) * (1.0 / 2.0); RadiusY = (rect.Bottom - rect.Y) * (1.0 / 2.0); Center = new Point(rect.X + RadiusX, rect.Y + RadiusY); } ////// Constructor - sets the ellipse to the parameters /// public EllipseGeometry( Point center, double radiusX, double radiusY) { Center = center; RadiusX = radiusX; RadiusY = radiusY; } ////// Constructor - sets the ellipse to the parameters /// public EllipseGeometry( Point center, double radiusX, double radiusY, Transform transform) : this(center, radiusX, radiusY) { Transform = transform; } #endregion ////// Gets the bounds of this Geometry as an axis-aligned bounding box /// public override Rect Bounds { get { ReadPreamble(); Rect boundsRect; Transform transform = Transform; if (transform == null || transform.IsIdentity) { Point currentCenter = Center; Double currentRadiusX = RadiusX; Double currentRadiusY = RadiusY; boundsRect = new Rect( currentCenter.X - Math.Abs(currentRadiusX), currentCenter.Y - Math.Abs(currentRadiusY), 2.0 * Math.Abs(currentRadiusX), 2.0 * Math.Abs(currentRadiusY)); } else { // // Matrix geometryMatrix; Transform.GetTransformValue(transform, out geometryMatrix); boundsRect = EllipseGeometry.GetBoundsHelper( null /* no pen */, Matrix.Identity, Center, RadiusX, RadiusY, geometryMatrix, StandardFlatteningTolerance, ToleranceType.Absolute); } return boundsRect; } } ////// Returns the axis-aligned bounding rectangle when stroked with a pen, after applying /// the supplied transform (if non-null). /// internal override Rect GetBoundsInternal(Pen pen, Matrix matrix, double tolerance, ToleranceType type) { Matrix geometryMatrix; Transform.GetTransformValue(Transform, out geometryMatrix); return EllipseGeometry.GetBoundsHelper( pen, matrix, Center, RadiusX, RadiusY, geometryMatrix, tolerance, type); } ////// Critical - it calls a critical method, Geometry.GetBoundsHelper and has an unsafe block /// TreatAsSafe - returning an EllipseGeometry's bounds is considered safe /// [SecurityCritical, SecurityTreatAsSafe] internal static Rect GetBoundsHelper(Pen pen, Matrix worldMatrix, Point center, double radiusX, double radiusY, Matrix geometryMatrix, double tolerance, ToleranceType type) { Rect rect; Debug.Assert(worldMatrix != null); Debug.Assert(geometryMatrix != null); if ( (pen == null || pen.DoesNotContainGaps) && worldMatrix.IsIdentity && geometryMatrix.IsIdentity) { double strokeThickness = 0.0; if (Pen.ContributesToBounds(pen)) { strokeThickness = Math.Abs(pen.Thickness); } rect = new Rect( center.X - Math.Abs(radiusX)-0.5*strokeThickness, center.Y - Math.Abs(radiusY)-0.5*strokeThickness, 2.0 * Math.Abs(radiusX)+strokeThickness, 2.0 * Math.Abs(radiusY)+strokeThickness); } else { unsafe { Point * pPoints = stackalloc Point[(int)c_pointCount]; EllipseGeometry.GetPointList(pPoints, c_pointCount, center, radiusX, radiusY); fixed (byte *pTypes = EllipseGeometry.s_roundedPathTypes) { rect = Geometry.GetBoundsHelper( pen, &worldMatrix, pPoints, pTypes, c_pointCount, c_segmentCount, &geometryMatrix, tolerance, type, false); // skip hollows - meaningless here, this is never a hollow } } } return rect; } ////// Critical - contains unsafe block and calls critical method Geometry.ContainsInternal. /// TreatAsSafe - as this doesn't expose anything sensitive. /// [SecurityCritical, SecurityTreatAsSafe] internal override bool ContainsInternal(Pen pen, Point hitPoint, double tolerance, ToleranceType type) { unsafe { Point *pPoints = stackalloc Point[(int)GetPointCount()]; EllipseGeometry.GetPointList(pPoints, GetPointCount(), Center, RadiusX, RadiusY); fixed (byte* pTypes = GetTypeList()) { return ContainsInternal( pen, hitPoint, tolerance, type, pPoints, GetPointCount(), pTypes, GetSegmentCount()); } } } #region Public Methods ////// Returns true if this geometry is empty /// public override bool IsEmpty() { return false; } ////// Returns true if this geometry may have curved segments /// public override bool MayHaveCurves() { return true; } ////// Gets the area of this geometry /// /// The computational error tolerance /// The way the error tolerance will be interpreted - realtive or absolute public override double GetArea(double tolerance, ToleranceType type) { ReadPreamble(); double area = Math.Abs(RadiusX * RadiusY) * Math.PI; // Adjust to internal transformation Transform transform = Transform; if (transform != null && !transform.IsIdentity) { area *= Math.Abs(transform.Value.Determinant); } return area; } #endregion Public Methods internal override PathFigureCollection GetTransformedFigureCollection(Transform transform) { Point [] points = GetPointList(); // Get the combined transform argument with the internal transform Matrix matrix = GetCombinedMatrix(transform); if (!matrix.IsIdentity) { for (int i=0; i/// GetAsPathGeometry - return a PathGeometry version of this Geometry /// internal override PathGeometry GetAsPathGeometry() { PathStreamGeometryContext ctx = new PathStreamGeometryContext(FillRule.EvenOdd, Transform); PathGeometry.ParsePathGeometryData(GetPathGeometryData(), ctx); return ctx.GetPathGeometry(); } /// /// GetPathGeometryData - returns a byte[] which contains this Geometry represented /// as a path geometry's serialized format. /// internal override PathGeometryData GetPathGeometryData() { if (IsObviouslyEmpty()) { return Geometry.GetEmptyPathGeometryData(); } PathGeometryData data = new PathGeometryData(); data.FillRule = FillRule.EvenOdd; data.Matrix = CompositionResourceManager.TransformToMilMatrix3x2D(Transform); Point[] points = GetPointList(); ByteStreamGeometryContext ctx = new ByteStreamGeometryContext(); ctx.BeginFigure(points[0], true /* is filled */, true /* is closed */); // i == 0, 3, 6, 9 for (int i = 0; i < 12; i += 3) { ctx.BezierTo(points[i + 1], points[i + 2], points[i + 3], true /* is stroked */, true /* is smooth join */); } ctx.Close(); data.SerializedData = ctx.GetData(); return data; } ////// ////// /// Critical - Calls critical code /// TreatAsSafe - returning a EllipseGeometry's point list is considered safe /// [SecurityCritical, SecurityTreatAsSafe] private Point[] GetPointList() { Point[] points = new Point[GetPointCount()]; unsafe { fixed(Point *pPoints = points) { EllipseGeometry.GetPointList(pPoints, GetPointCount(), Center, RadiusX, RadiusY); } } return points; } ////// Critical - Accepts pointer arguments /// [SecurityCritical] private unsafe static void GetPointList(Point * points, uint pointsCount, Point center, double radiusX, double radiusY) { Invariant.Assert(pointsCount >= c_pointCount); radiusX = Math.Abs(radiusX); radiusY = Math.Abs(radiusY); // Set the X coordinates double mid = radiusX * c_arcAsBezier; points[0].X = points[1].X = points[11].X = points[12].X = center.X + radiusX; points[2].X = points[10].X = center.X + mid; points[3].X = points[9].X = center.X; points[4].X = points[8].X = center.X - mid; points[5].X = points[6].X = points[7].X = center.X - radiusX; // Set the Y coordinates mid = radiusY * c_arcAsBezier; points[2].Y = points[3].Y = points[4].Y = center.Y + radiusY; points[1].Y = points[5].Y = center.Y + mid; points[0].Y = points[6].Y = points[12].Y = center.Y; points[7].Y = points[11].Y = center.Y - mid; points[8].Y = points[9].Y = points[10].Y = center.Y - radiusY; } private byte[] GetTypeList() { return s_roundedPathTypes; } private uint GetPointCount() { return c_pointCount; } private uint GetSegmentCount() { return c_segmentCount; } #region Static Data // Approximating a 1/4 circle with a Bezier curve _ internal const double c_arcAsBezier = 0.5522847498307933984; // =( \/2 - 1)*4/3 private const UInt32 c_segmentCount = 4; private const UInt32 c_pointCount = 13; private const byte c_smoothBezier = (byte)MILCoreSegFlags.SegTypeBezier | (byte)MILCoreSegFlags.SegIsCurved | (byte)MILCoreSegFlags.SegSmoothJoin; private static readonly byte[] s_roundedPathTypes = { (byte)MILCoreSegFlags.SegTypeBezier | (byte)MILCoreSegFlags.SegIsCurved | (byte)MILCoreSegFlags.SegSmoothJoin | (byte)MILCoreSegFlags.SegClosed, c_smoothBezier, c_smoothBezier, c_smoothBezier }; #endregion } } // 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
- PackageDigitalSignature.cs
- HostedImpersonationContext.cs
- DropDownButton.cs
- Dynamic.cs
- DBAsyncResult.cs
- MetadataItemCollectionFactory.cs
- RelationalExpressions.cs
- SessionStateUtil.cs
- AnnotationResource.cs
- ThemeableAttribute.cs
- SplitterCancelEvent.cs
- SHA1CryptoServiceProvider.cs
- RawAppCommandInputReport.cs
- DataSetMappper.cs
- IntegrationExceptionEventArgs.cs
- LoginUtil.cs
- SystemTcpConnection.cs
- Transform3D.cs
- HtmlTableCellCollection.cs
- MobileCapabilities.cs
- MatrixKeyFrameCollection.cs
- GridViewSortEventArgs.cs
- KeyFrames.cs
- DecoderFallback.cs
- SystemMulticastIPAddressInformation.cs
- ToolStripDropDownItem.cs
- CompositeDispatchFormatter.cs
- ZipPackagePart.cs
- InlineUIContainer.cs
- DropTarget.cs
- DictionaryEntry.cs
- FunctionDescription.cs
- EnumValAlphaComparer.cs
- HeaderCollection.cs
- BrowserCapabilitiesCompiler.cs
- FixedFlowMap.cs
- AppDomainManager.cs
- WhiteSpaceTrimStringConverter.cs
- DetailsViewDeleteEventArgs.cs
- ConnectionInterfaceCollection.cs
- QilName.cs
- ProcessThreadDesigner.cs
- ParameterCollection.cs
- StylusPointCollection.cs
- HostAdapter.cs
- CellPartitioner.cs
- LifetimeServices.cs
- IndependentlyAnimatedPropertyMetadata.cs
- ConcurrentStack.cs
- XmlCountingReader.cs
- KnownTypesProvider.cs
- Tablet.cs
- XmlMemberMapping.cs
- EventLogger.cs
- ContainerAction.cs
- SQLBytesStorage.cs
- GroupBox.cs
- GridViewPageEventArgs.cs
- XmlBaseWriter.cs
- DataPagerFieldItem.cs
- CommandPlan.cs
- DesignSurfaceServiceContainer.cs
- CodeDirectiveCollection.cs
- FileNotFoundException.cs
- InstancePersistenceCommandException.cs
- OperationContextScope.cs
- PropertyChange.cs
- TemplatePartAttribute.cs
- WinFormsUtils.cs
- WindowsTooltip.cs
- AdCreatedEventArgs.cs
- WorkflowCreationContext.cs
- PreProcessor.cs
- CodeChecksumPragma.cs
- DataGridViewCellCancelEventArgs.cs
- InternalBase.cs
- SolidColorBrush.cs
- WebScriptServiceHostFactory.cs
- XmlLoader.cs
- TransactedBatchingElement.cs
- CompatibleIComparer.cs
- ExecutedRoutedEventArgs.cs
- Select.cs
- PrimitiveType.cs
- XamlClipboardData.cs
- SHA1CryptoServiceProvider.cs
- FrameworkElement.cs
- NativeObjectSecurity.cs
- Attributes.cs
- ActivityXamlServices.cs
- CompilerInfo.cs
- MetadataCollection.cs
- DrawingImage.cs
- ObjectResult.cs
- _HeaderInfo.cs
- LabelEditEvent.cs
- InputMethod.cs
- HwndSourceParameters.cs
- XmlNodeReader.cs
- LogPolicy.cs