RectangleGeometry.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / RectangleGeometry.cs / 1305600 / RectangleGeometry.cs

                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation, 2001
//
//  File:       RectangleGeometry.cs 
//-----------------------------------------------------------------------------
 
using System; 
using MS.Internal;
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 SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID; 
 
namespace System.Windows.Media
{ 
    /// 
    /// This is the Geometry class for Rectangles and RoundedRectangles.
    /// 
    public sealed partial class RectangleGeometry : Geometry 
    {
        #region Constructors 
 
        /// 
        /// 
        /// 
        public RectangleGeometry()
        {
        } 

        ///  
        /// Constructor - sets the rounded rectangle to equal the passed in parameters 
        /// 
        public RectangleGeometry(Rect rect) 
        {
            Rect = rect;
        }
 
        /// 
        /// Constructor - sets the rounded rectangle to equal the passed in parameters 
        ///  
        public RectangleGeometry(Rect rect,
            double radiusX, 
            double radiusY) : this(rect)
        {
            RadiusX = radiusX;
            RadiusY = radiusY; 
        }
 
        ///  
        ///
        ///  
        /// 
        /// 
        /// 
        ///  
        public RectangleGeometry(
            Rect rect, 
            double radiusX, 
            double radiusY,
            Transform transform) : this(rect, 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; 

                Rect currentRect = Rect; 
                Transform transform = Transform;

                if (currentRect.IsEmpty)
                { 
                    boundsRect = Rect.Empty;
                } 
                else if (transform == null || transform.IsIdentity) 
                {
                    boundsRect = currentRect; 
                }
                else
                {
                    double radiusX = RadiusX; 
                    double radiusY = RadiusY;
 
                    if (radiusX == 0 && radiusY == 0) 
                    {
                        boundsRect = currentRect; 
                        transform.TransformRect(ref boundsRect);
                    }
                    else
                    { 
                        //
                        // Transformed rounded rectangles are more tricky. 
                        // 
                        //
 



 
                        Matrix geometryMatrix;
 
                        Transform.GetTransformValue(transform, out geometryMatrix); 

                        boundsRect = RectangleGeometry.GetBoundsHelper( 
                            null /* no pen */,
                            Matrix.Identity,
                            currentRect,
                            radiusX, 
                            radiusY,
                            geometryMatrix, 
                            StandardFlatteningTolerance, 
                            ToleranceType.Absolute);
                    } 
                }

                return boundsRect;
            } 
        }
 
        internal override bool AreClose(Geometry geometry) 
        {
            RectangleGeometry rectGeometry2 = geometry as RectangleGeometry; 

            if (rectGeometry2 != null)
            {
                RectangleGeometry rectGeometry1 = this; 
                Rect rect1 = rectGeometry1.Rect;
                Rect rect2 = rectGeometry2.Rect; 
 
                return (
                    DoubleUtil.AreClose(rect1.X, rect2.X) && 
                    DoubleUtil.AreClose(rect1.Y, rect2.Y) &&
                    DoubleUtil.AreClose(rect1.Width, rect2.Width) &&
                    DoubleUtil.AreClose(rect1.Height, rect2.Height) &&
                    DoubleUtil.AreClose(rectGeometry1.RadiusX, rectGeometry2.RadiusX) && 
                    DoubleUtil.AreClose(rectGeometry1.RadiusY, rectGeometry2.RadiusY) &&
                    (rectGeometry1.Transform == rectGeometry2.Transform) && 
                    (rectGeometry1.IsFrozen == rectGeometry2.IsFrozen) 
                    );
            } 

            return base.AreClose(geometry);
        }
 
        /// 
        /// 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 worldMatrix, double tolerance, ToleranceType type) 
        {
            Matrix geometryMatrix;

            Transform.GetTransformValue(Transform, out geometryMatrix); 

            return RectangleGeometry.GetBoundsHelper( 
                pen, 
                worldMatrix,
                Rect, 
                RadiusX,
                RadiusY,
                geometryMatrix,
                tolerance, 
                type);
        } 
 
        /// 
        /// Critical - it calls a critical method, Geometry.GetBoundsHelper and has an unsafe block 
        /// TreatAsSafe - returning a RectangleGeometry's bounds is considered safe
        /// 
        [SecurityCritical, SecurityTreatAsSafe]
        internal static Rect GetBoundsHelper(Pen pen, Matrix worldMatrix, Rect rect, double radiusX, double radiusY, 
                                             Matrix geometryMatrix, double tolerance, ToleranceType type)
        { 
            Rect boundingRect; 

            Debug.Assert(worldMatrix != null); 
            Debug.Assert(geometryMatrix != null);

            if (rect.IsEmpty)
            { 
                boundingRect = Rect.Empty;
            } 
            else if ( (pen == null || pen.DoesNotContainGaps) && 
                geometryMatrix.IsIdentity && worldMatrix.IsIdentity)
            { 
                double strokeThickness = 0.0;

                boundingRect = rect;
 
                if (Pen.ContributesToBounds(pen))
                { 
                    strokeThickness = Math.Abs(pen.Thickness); 

                    boundingRect.X -= 0.5*strokeThickness; 
                    boundingRect.Y -= 0.5*strokeThickness;
                    boundingRect.Width += strokeThickness;
                    boundingRect.Height += strokeThickness;
                } 
            }
            else 
            { 
                unsafe
                { 
                    uint pointCount, segmentCount;
                    GetCounts(rect, radiusX, radiusY, out pointCount, out segmentCount);

                    // We've checked that rect isn't empty above 
                    Invariant.Assert(pointCount != 0);
 
                    Point * pPoints = stackalloc Point[(int)pointCount]; 
                    RectangleGeometry.GetPointList(pPoints, pointCount, rect, radiusX, radiusY);
 
                    fixed (byte *pTypes = RectangleGeometry.GetTypeList(rect, radiusX, radiusY))
                    {
                        boundingRect = Geometry.GetBoundsHelper(
                            pen, 
                            &worldMatrix,
                            pPoints, 
                            pTypes, 
                            pointCount,
                            segmentCount, 
                            &geometryMatrix,
                            tolerance,
                            type,
                            false);  // skip hollows - meaningless here, this is never a hollow 
                    }
                } 
            } 

            return boundingRect; 
        }

        /// 
        /// 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)
        { 
            if (IsEmpty())
            {
                return false;
            } 

            double radiusX = RadiusX; 
            double radiusY = RadiusY; 
            Rect rect = Rect;
 
            uint pointCount = GetPointCount(rect, radiusX, radiusY);
            uint segmentCount = GetSegmentCount(rect, radiusX, radiusY);

            unsafe 
            {
                Point *pPoints = stackalloc Point[(int)pointCount]; 
                RectangleGeometry.GetPointList(pPoints, pointCount, rect, radiusX, radiusY); 

                fixed (byte* pTypes = GetTypeList(rect, radiusX, radiusY)) 
                {
                    return ContainsInternal(
                        pen,
                        hitPoint, 
                        tolerance,
                        type, 
                        pPoints, 
                        pointCount,
                        pTypes, 
                        segmentCount);
                }
            }
        } 

        ///  
        /// Gets the area of this geometry 
        /// 
        /// The computational error tolerance 
        /// The way the error tolerance will be interpreted - relative or absolute
        public override double GetArea(double tolerance, ToleranceType type)
        {
            ReadPreamble(); 

            if (IsEmpty()) 
            { 
                return 0.0;
            } 

            double radiusX = RadiusX;
            double radiusY = RadiusY;
            Rect rect = Rect; 

            // Get the area of the bounding rectangle 
            double area = Math.Abs(rect.Width * rect.Height); 

            // correct it for the rounded corners 
            area -= Math.Abs(radiusX * radiusY) * (4.0 - Math.PI);

            // Adjust to internal transformation
            Transform transform = Transform; 
            if (!transform.IsIdentity)
            { 
                area *= Math.Abs(transform.Value.Determinant); 
            }
 
            return area;
        }

        internal override PathFigureCollection GetTransformedFigureCollection(Transform transform) 
        {
            if (IsEmpty()) 
            { 
                return null;
            } 

            // Combine the transform argument with the internal transform
            Matrix matrix = GetCombinedMatrix(transform);
 
            double radiusX = RadiusX;
            double radiusY = RadiusY; 
            Rect rect = Rect; 

            if (IsRounded(radiusX, radiusY)) 
            {
                Point[] points = GetPointList(rect, radiusX, radiusY);

                // Transform if applicable. 
                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);
 
            double radiusX = RadiusX;
            double radiusY = RadiusY;
            Rect rect = Rect;
 
            ByteStreamGeometryContext ctx = new ByteStreamGeometryContext();
 
            if (IsRounded(radiusX, radiusY)) 
            {
                Point[] points = GetPointList(rect, radiusX, radiusY); 

                ctx.BeginFigure(points[0], true /* is filled */, true /* is closed */);
                ctx.BezierTo(points[1], points[2], points[3], true /* is stroked */, false /* is smooth join */);
                ctx.LineTo(points[4], true /* is stroked */, false /* is smooth join */); 
                ctx.BezierTo(points[5], points[6], points[7], true /* is stroked */, false /* is smooth join */);
                ctx.LineTo(points[8], true /* is stroked */, false /* is smooth join */); 
                ctx.BezierTo(points[9], points[10], points[11], true /* is stroked */, false /* is smooth join */); 
                ctx.LineTo(points[12], true /* is stroked */, false /* is smooth join */);
                ctx.BezierTo(points[13], points[14], points[15], true /* is stroked */, false /* is smooth join */); 
            }
            else
            {
                ctx.BeginFigure(rect.TopLeft, true /* is filled */, true /* is closed */); 
                ctx.LineTo(Rect.TopRight, true /* is stroked */, false /* is smooth join */);
                ctx.LineTo(Rect.BottomRight, true /* is stroked */, false /* is smooth join */); 
                ctx.LineTo(Rect.BottomLeft, true /* is stroked */, false /* is smooth join */); 
            }
 
            ctx.Close();
            data.SerializedData = ctx.GetData();

            return data; 
        }
 
        ///  
        /// 
        ///  
        /// 
        /// Critical - Calls critical code
        /// TreatAsSafe - returning a RectangleGeometry's point list is considered safe
        ///  
        [SecurityCritical, SecurityTreatAsSafe]
        private Point[] GetPointList(Rect rect, double radiusX, double radiusY) 
        { 
            uint pointCount = GetPointCount(rect, radiusX, radiusY);
            Point[] points = new Point[pointCount]; 

            unsafe
            {
                fixed(Point *pPoints = points) 
                {
                    RectangleGeometry.GetPointList(pPoints, pointCount, rect, radiusX, radiusY); 
                } 
            }
 
            return points;
        }

        ///  
        /// Critical - Accepts pointer arguments
        ///  
        [SecurityCritical] 
        private unsafe static void GetPointList(Point * points, uint pointsCount, Rect rect, double radiusX, double radiusY)
        { 
            if (IsRounded(radiusX, radiusY))
            {
                // It is a rounded rectangle
                Invariant.Assert(pointsCount >= c_roundedPointCount); 

                radiusX = Math.Min(rect.Width * (1.0 / 2.0), Math.Abs(radiusX)); 
                radiusY = Math.Min(rect.Height * (1.0 / 2.0), Math.Abs(radiusY)); 

                double bezierX = ((1.0 - EllipseGeometry.c_arcAsBezier) * radiusX); 
                double bezierY = ((1.0 - EllipseGeometry.c_arcAsBezier) * radiusY);

                points[1].X = points[0].X = points[15].X = points[14].X = rect.X;
                points[2].X = points[13].X = rect.X + bezierX; 
                points[3].X = points[12].X = rect.X + radiusX;
                points[4].X = points[11].X = rect.Right - radiusX; 
                points[5].X = points[10].X = rect.Right - bezierX; 
                points[6].X = points[7].X = points[8].X = points[9].X = rect.Right;
 
                points[2].Y = points[3].Y = points[4].Y = points[5].Y = rect.Y;
                points[1].Y = points[6].Y = rect.Y + bezierY;
                points[0].Y = points[7].Y = rect.Y + radiusY;
                points[15].Y = points[8].Y = rect.Bottom - radiusY; 
                points[14].Y = points[9].Y = rect.Bottom - bezierY;
                points[13].Y = points[12].Y = points[11].Y = points[10].Y = rect.Bottom; 
 
                points[16] = points[0];
            } 
            else
            {
                // The rectangle is not rounded
                Invariant.Assert(pointsCount >= c_squaredPointCount); 

                points[0].X = points[3].X = points[4].X = rect.X; 
                points[1].X = points[2].X = rect.Right; 

                points[0].Y = points[1].Y = points[4].Y = rect.Y; 
                points[2].Y = points[3].Y = rect.Bottom;
            }
        }
 
        private static byte[] GetTypeList(Rect rect, double radiusX, double radiusY)
        { 
            if (rect.IsEmpty) 
            {
                return null; 
            }
            else if (IsRounded(radiusX, radiusY))
            {
                return s_roundedPathTypes; 
            }
            else 
            { 
                return s_squaredPathTypes;
            } 
        }

        private uint GetPointCount(Rect rect, double radiusX, double radiusY)
        { 
            if (rect.IsEmpty)
            { 
                return 0; 
            }
            else if (IsRounded(radiusX, radiusY)) 
            {
                return c_roundedPointCount;
            }
            else 
            {
                return c_squaredPointCount; 
            } 
        }
 
        private uint GetSegmentCount(Rect rect, double radiusX, double radiusY)
        {
            if (rect.IsEmpty)
            { 
                return 0;
            } 
            else if (IsRounded(radiusX, radiusY)) 
            {
                return c_roundedSegmentCount; 
            }
            else
            {
                return c_squaredSegmentCount; 
            }
        } 
 
        private static void GetCounts(Rect rect, double radiusX, double radiusY, out uint pointCount, out uint segmentCount)
        { 
            if (rect.IsEmpty)
            {
                pointCount = 0;
                segmentCount = 0; 
            }
            else if (IsRounded(radiusX, radiusY)) 
            { 
                // The rectangle is rounded
                pointCount = c_roundedPointCount; 
                segmentCount = c_roundedSegmentCount;
            }
            else
            { 
                pointCount = c_squaredPointCount;
                segmentCount = c_squaredSegmentCount; 
            } 
        }
 
        #region Public Methods

        /// 
        /// Returns true if this geometry is empty 
        /// 
        public override bool IsEmpty() 
        { 
            return Rect.IsEmpty;
        } 

        /// 
        /// Returns true if this geometry may have curved segments
        ///  
        public override bool MayHaveCurves()
        { 
            return IsRounded(); 
        }
 
        #endregion Public Methods

        #region InstanceData
 
        // Rouneded
        static private UInt32 c_roundedSegmentCount = 8; 
        static private UInt32 c_roundedPointCount = 17; 

        static private byte smoothBezier = (byte)MILCoreSegFlags.SegTypeBezier | 
                                            (byte)MILCoreSegFlags.SegIsCurved   |
                                            (byte)MILCoreSegFlags.SegSmoothJoin;

        static private byte smoothLine = (byte)MILCoreSegFlags.SegTypeLine | (byte)MILCoreSegFlags.SegSmoothJoin; 

        static private byte[] s_roundedPathTypes = { 
            (byte)MILCoreSegFlags.SegTypeBezier | 
            (byte)MILCoreSegFlags.SegIsCurved   |
            (byte)MILCoreSegFlags.SegSmoothJoin | 
            (byte)MILCoreSegFlags.SegClosed,
            smoothLine,
            smoothBezier,
            smoothLine, 
            smoothBezier,
            smoothLine, 
            smoothBezier, 
            smoothLine
        }; 

        // Squared
        private const UInt32 c_squaredSegmentCount = 4;
        private const UInt32 c_squaredPointCount = 5; 

        private static readonly byte[] s_squaredPathTypes = { 
            (byte)MILCoreSegFlags.SegTypeLine | (byte)MILCoreSegFlags.SegClosed, 
            (byte)MILCoreSegFlags.SegTypeLine,
            (byte)MILCoreSegFlags.SegTypeLine, 
            (byte)MILCoreSegFlags.SegTypeLine
        };

        #endregion 
    }
} 
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK