Polygon.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 / Framework / System / Windows / Shapes / Polygon.cs / 1 / Polygon.cs
                        

                        
                            //---------------------------------------------------------------------------- 
// File: Polygon.cs
//
// Description:
// Implementation of Polygon 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;

namespace System.Windows.Shapes 
{
    ///  
    /// The polygon shape element 
    /// This element (like all shapes) belongs under a Canvas,
    /// and will be presented by the parent canvas. 
    /// Since a Polygon is really a polyline which closes its path
    /// 
    public sealed class Polygon : Shape
    { 

        #region Constructors 
 
        /// 
        /// Instantiates a new instance of a polygon. 
        /// 
        public Polygon()
        {
        } 

        #endregion Constructors 
 
        #region Dynamic Properties
 
        /// 
        /// Points property
        /// 
        public static readonly DependencyProperty PointsProperty = DependencyProperty.Register( 
                "Points", typeof(PointCollection), typeof(Polygon),
                new FrameworkPropertyMetadata(new FreezableDefaultValueFactory(PointCollection.Empty), FrameworkPropertyMetadataOptions.AffectsMeasure | FrameworkPropertyMetadataOptions.AffectsRender)); 
 
        /// 
        /// Points property 
        /// 
        public PointCollection Points
        {
            get 
            {
                return (PointCollection)GetValue(PointsProperty); 
            } 
            set
            { 
                SetValue(PointsProperty, value);
            }
        }
 
        /// 
        /// FillRule property 
        ///  
        public static readonly DependencyProperty FillRuleProperty = DependencyProperty.Register(
            "FillRule", 
            typeof(FillRule),
            typeof(Polygon),
            new FrameworkPropertyMetadata(
                FillRule.EvenOdd, 
                FrameworkPropertyMetadataOptions.AffectsRender),
            new ValidateValueCallback(System.Windows.Media.ValidateEnums.IsFillRuleValid) 
            ); 

        ///  
        /// FillRule property
        /// 
        public FillRule FillRule
        { 
            get
            { 
                return (FillRule)GetValue(FillRuleProperty); 
            }
            set 
            {
                SetValue(FillRuleProperty, value);
            }
        } 
        #endregion Dynamic Properties
 
        #region Protected Methods and properties 

        ///  
        /// Get the polygon that defines this shape
        /// 
        protected override Geometry DefiningGeometry
        { 
            get
            { 
                return _polygonGeometry; 
            }
        } 

        #endregion

 
        #region Internal Methods
        internal override void CacheDefiningGeometry() 
        { 
            PointCollection pointCollection = Points;
            PathFigure pathFigure = new PathFigure(); 

            // Are we degenerate?
            // Yes, if we don't have data
            if (pointCollection == null) 
            {
                _polygonGeometry = Geometry.Empty; 
                return; 
            }
 
            // Create the polygon PathGeometry
            //

 
            if (pointCollection.Count > 0)
            { 
                pathFigure.StartPoint = pointCollection[0]; 

                if (pointCollection.Count > 1) 
                {
                    Point[] array = new Point[pointCollection.Count - 1];

                    for (int i = 1; i < pointCollection.Count; i++) 
                    {
                        array[i - 1] = pointCollection[i]; 
                    } 

                    pathFigure.Segments.Add(new PolyLineSegment(array, true)); 
                }

                pathFigure.IsClosed = true;
            } 

            PathGeometry polygonGeometry = new PathGeometry(); 
            polygonGeometry.Figures.Add(pathFigure); 

            // Set FillRule 
            polygonGeometry.FillRule = FillRule;

            _polygonGeometry = polygonGeometry;
        } 
        #endregion Internal Methods
 
 
        #region Private Methods and Members
 
        private Geometry _polygonGeometry;

        #endregion
   } 
}

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

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