ArcSegment.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / ArcSegment.cs / 1305600 / ArcSegment.cs
                        
                        
                            //-------------------------------------------------------------------------------------------------- 
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  Description: Impelementation of ArcSegment 
//
//  History: 
// 
//-------------------------------------------------------------------------------------------------
 
using MS.Internal;
using MS.Internal.PresentationCore;
using System;
using System.Collections; 
using System.ComponentModel;
using System.ComponentModel.Design.Serialization; 
using System.Diagnostics; 
using System.Globalization;
using System.Reflection; 
using System.Text;
using System.Security;
using System.Security.Permissions;
using System.Text.RegularExpressions; 
using System.Windows.Media;
using System.Windows; 
using System.Windows.Media.Composition; 
using System.Windows.Media.Animation;
 
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;

namespace System.Windows.Media 
{
    ///  
    /// ArcSegment 
    /// 
    public sealed partial class ArcSegment : PathSegment 
    {
        #region Constructors

        ///  
        ///
        ///  
        public ArcSegment() 
        {
        } 

        /// 
        ///
        ///  
        public ArcSegment(
            Point point, 
            Size size, 
            double rotationAngle,
            bool isLargeArc, 
            SweepDirection sweepDirection,
            bool isStroked)
        {
            Size = size; 
            RotationAngle = rotationAngle;
            IsLargeArc = isLargeArc; 
            SweepDirection = sweepDirection; 
            Point = point;
            IsStroked = isStroked; 
        }

        #endregion
 
        #region AddToFigure
        ///  
        ///     Critical: This code calls into MilUtility_ArcToBezier which has an unmanaged code elevation 
        ///     TreatAsSafe: Adding a figure is considered safe in partial trust.
        ///  
        [SecurityCritical,SecurityTreatAsSafe]
        internal override void AddToFigure(
            Matrix matrix,          // The transformation matrid
            PathFigure figure,      // The figure to add to 
            ref Point current)      // In: Segment start point, Out: Segment endpoint, neither transformed
        { 
            Point endPoint = Point; 

            if (matrix.IsIdentity) 
            {
                figure.Segments.Add(this);
            }
            else 
            {
                // The arc segment is approximated by up to 4 Bezier segments 
                unsafe 
                {
                    int count; 
                    Point* points = stackalloc Point[12];
                    Size    size = Size;
                    Double  rotation = RotationAngle;
                    MilMatrix3x2D mat3X2 = CompositionResourceManager.MatrixToMilMatrix3x2D(ref matrix); 

                    Composition.MilCoreApi.MilUtility_ArcToBezier( 
                        current,    // =start point 
                        size,
                        rotation, 
                        IsLargeArc,
                        SweepDirection,
                        endPoint,
                        &mat3X2, 
                        points,
                        out count); // = number of Bezier segments 
 
                    Invariant.Assert(count <= 4);
 
                    // To ensure no buffer overflows
                    count = Math.Min(count, 4);

                    bool isStroked = IsStroked; 
                    bool isSmoothJoin = IsSmoothJoin;
 
                    // Add the segments 
                    if (count > 0)
                    { 
                        for (int i = 0; i < count; i++)
                        {
                            figure.Segments.Add(new BezierSegment(
                                    points[3*i], 
                                    points[3*i + 1],
                                    points[3*i + 2], 
                                    isStroked, 
                                    (i < count - 1) || isSmoothJoin));    // Smooth join between arc pieces
                        } 
                    }
                    else if (count == 0)
                    {
                        figure.Segments.Add(new LineSegment(points[0], isStroked, isSmoothJoin)); 
                    }
                } 
 
                // Update the last point
                current = endPoint; 
            }
        }
        #endregion
 
        /// 
        /// SerializeData - Serialize the contents of this Segment to the provided context. 
        ///  
        internal override void SerializeData(StreamGeometryContext ctx)
        { 
            ctx.ArcTo(Point, Size, RotationAngle, IsLargeArc, SweepDirection, IsStroked, IsSmoothJoin);
        }

        internal override bool IsCurved() 
        {
            return true; 
        } 

        ///  
        /// Creates a string representation of this object based on the format string
        /// and IFormatProvider passed in.
        /// If the provider is null, the CurrentCulture is used.
        /// See the documentation for IFormattable for more information. 
        /// 
        ///  
        /// A string representation of this object. 
        /// 
        internal override string ConvertToString(string format, IFormatProvider provider) 
        {
            // Helper to get the numeric list separator for a given culture.
            char separator = MS.Internal.TokenizerHelper.GetNumericListSeparator(provider);
            return String.Format(provider, 
                                 "A{1:" + format + "}{0}{2:" + format + "}{0}{3}{0}{4}{0}{5:" + format + "}",
                                 separator, 
                                 Size, 
                                 RotationAngle,
                                 IsLargeArc ? "1" : "0", 
                                 SweepDirection == SweepDirection.Clockwise ? "1" : "0",
                                 Point);
        }
 
        //
        //  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 6; }
        } 

        ///  
        /// For the purposes of this class, Size.Empty should be treated as if it were Size(0,0). 
        /// 
        private static object CoerceSize(DependencyObject d, object value) 
        {
            if (((Size)value).IsEmpty)
            {
                return new Size(0,0); 
            }
            else 
            { 
                return value;
            } 
        }
    }
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ArcSegment.cs source code in C# .NET

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