ContourSegment.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Core / MS / Internal / Ink / ContourSegment.cs / 1 / ContourSegment.cs
                        

                        
                            //------------------------------------------------------------------------ 
// 
// Copyright (c) Microsoft Corporation. All rights reserved.
// 
//----------------------------------------------------------------------- 

using System; 
using System.Windows; 
using System.Windows.Media;
 
namespace MS.Internal.Ink
{
    /// 
    /// A helper structure representing an edge of a contour, where 
    /// the edge is either a straight segment or an arc of a circle.
    /// ContourSegment are alwais directed clockwise (i.e with the contour 
    /// inner area being on the right side. 
    /// Used in hit-testing a contour vs another contour.
    ///  
    internal struct ContourSegment
    {
        /// 
        /// Constructor for linear segments 
        /// 
        /// segment's begin point 
        /// segment's end point 
        internal ContourSegment(Point begin, Point end)
        { 
            _begin = begin;
            _vector = DoubleUtil.AreClose(begin, end) ? new Vector(0, 0) : (end - begin);
            _radius = new Vector(0, 0);
        } 

        ///  
        /// Constructor for arcs 
        /// 
        /// arc's begin point 
        /// arc's end point
        /// arc's center
        internal ContourSegment(Point begin, Point end, Point center)
        { 
            _begin = begin;
            _vector = end - begin; 
            _radius = center - begin; 
        }
 
        ///  Tells whether the segment is arc or straight 
        internal bool IsArc { get { return (_radius.X != 0) || (_radius.Y != 0); } }

        ///  Returns the begin point of the segment  
        internal Point  Begin { get { return _begin; } }
 
        ///  Returns the end point of the segment  
        internal Point  End { get { return _begin + _vector; } }
 
        ///  Returns the vector from Begin to End 
        internal Vector Vector { get { return _vector; } }

        ///  Returns the vector from Begin to the center of the circle 
        /// (zero vector for linear segments 
        internal Vector Radius { get { return _radius; } } 
 
        #region Fields
 
        private Point   _begin;
        private Vector  _vector;
        private Vector  _radius;
 
        #endregion
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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