GraphicsPathIterator.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CommonUI / System / Drawing / Advanced / GraphicsPathIterator.cs / 1305376 / GraphicsPathIterator.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Drawing.Drawing2D { 
    using System.Diagnostics; 
    using System.Diagnostics.CodeAnalysis;
    using System; 
    using System.Runtime.InteropServices;
    using Microsoft.Win32;
    using System.Drawing;
    using System.ComponentModel; 
    using System.Drawing.Internal;
    using System.Globalization; 
    using System.Runtime.Versioning; 

    /** 
     * Represent a Path Iterator object
     */
    /// 
    ///  
    ///    
    ///       Provides helper functions for the  class. 
    ///     
    /// 
    public sealed class GraphicsPathIterator : MarshalByRefObject, IDisposable { 
        /**
         * Create a new path iterator object
         */
        ///  
        /// 
        ///    Initializes a new instance of the  class with the specified . 
        ///  
        [ResourceExposure(ResourceScope.Process)]
        [ResourceConsumption(ResourceScope.Process)] 
        public GraphicsPathIterator(GraphicsPath path)
        {
            IntPtr nativeIter = IntPtr.Zero;
 
            int status = SafeNativeMethods.Gdip.GdipCreatePathIter(out nativeIter, new HandleRef(path, (path == null) ? IntPtr.Zero : path.nativePath));
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            this.nativeIter = nativeIter;
        }

        /** 
         * Dispose of resources associated with the
         */ 
        ///  
        /// 
        ///    Cleans up Windows resources for this 
        /// .
        /// 
        public void Dispose() {
            Dispose(true); 
            GC.SuppressFinalize(this);
        } 
 
        void Dispose(bool disposing) {
            if (nativeIter != IntPtr.Zero) { 
                try{
#if DEBUG
                    int status =
#endif 
                    SafeNativeMethods.Gdip.GdipDeletePathIter(new HandleRef(this, nativeIter));
#if DEBUG 
                    Debug.Assert(status == SafeNativeMethods.Gdip.Ok, "GDI+ returned an error status: " + status.ToString(CultureInfo.InvariantCulture)); 
#endif
                } 
                catch( Exception ex ){
                    if( ClientUtils.IsSecurityOrCriticalException( ex ) ) {
                        throw;
                    } 

                    Debug.Fail( "Exception thrown during Dispose: " + ex.ToString() ); 
                } 
                finally{
                    nativeIter = IntPtr.Zero; 
                }
            }
        }
 
        /// 
        ///  
        ///    Cleans up Windows resources for this 
        /// .
        ///  
        ~GraphicsPathIterator() {
            Dispose(false);
        }
 
        /**
         * Next subpath in path 
         */ 
        /// 
        ///  
        ///    Returns the number of subpaths in the
        /// . The start index and end index of the
        ///    next subpath are contained in out parameters.
        ///  
        public int NextSubpath(out int startIndex, out int endIndex, out bool isClosed) {
            int resultCount = 0; 
            int tempStart = 0; 
            int tempEnd = 0;
            int status = SafeNativeMethods.Gdip.GdipPathIterNextSubpath(new HandleRef(this, nativeIter), out resultCount, 
                                    out tempStart, out tempEnd, out isClosed);

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
            else {
                startIndex = tempStart; 
                endIndex = tempEnd; 
            }
 
            return resultCount;
        }

        /** 
         * Next subpath in path
         */ 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public int NextSubpath(GraphicsPath path, out bool isClosed) {
            int resultCount = 0;
            int status = SafeNativeMethods.Gdip.GdipPathIterNextSubpathPath(new HandleRef(this, nativeIter), out resultCount, 
                                    new HandleRef(path, (path == null) ? IntPtr.Zero : path.nativePath), out isClosed);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return resultCount;
        }

        /** 
         * Next type in subpath
         */ 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public int NextPathType(out byte pathType, out int startIndex, out int endIndex)
        {
            int resultCount = 0; 
            int status = SafeNativeMethods.Gdip.GdipPathIterNextPathType(new HandleRef(this, nativeIter), out resultCount,
                                    out pathType, out startIndex, out endIndex); 
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 

            return resultCount;
        }
 
        /**
         * Next marker in subpath 
         */ 
        /// 
        ///  
        ///    [To be supplied.]
        /// 
        public int NextMarker(out int startIndex, out int endIndex)
        { 
            int resultCount = 0;
            int status = SafeNativeMethods.Gdip.GdipPathIterNextMarker(new HandleRef(this, nativeIter), out resultCount, 
                                    out startIndex, out endIndex); 

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);

            return resultCount;
        } 

        /** 
         * Next marker in subpath 
         */
        ///  
        /// 
        ///    [To be supplied.]
        /// 
        public int NextMarker(GraphicsPath path) 
        {
            int resultCount = 0; 
            int status = SafeNativeMethods.Gdip.GdipPathIterNextMarkerPath(new HandleRef(this, nativeIter), out resultCount, 
                                    new HandleRef(path, (path == null) ? IntPtr.Zero : path.nativePath));
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);

            return resultCount; 
        }
 
        ///  
        /// 
        ///    [To be supplied.] 
        /// 
        public int Count
        {
            get { 
                int resultCount = 0;
                int status = SafeNativeMethods.Gdip.GdipPathIterGetCount(new HandleRef(this, nativeIter), out resultCount); 
 
                if (status != SafeNativeMethods.Gdip.Ok)
                    throw SafeNativeMethods.Gdip.StatusException(status); 

                return resultCount;
            }
        } 

        ///  
        ///  
        ///    [To be supplied.]
        ///  
        public int SubpathCount
        {
            get {
                int resultCount = 0; 
                int status = SafeNativeMethods.Gdip.GdipPathIterGetSubpathCount(new HandleRef(this, nativeIter), out resultCount);
 
                if (status != SafeNativeMethods.Gdip.Ok) 
                    throw SafeNativeMethods.Gdip.StatusException(status);
 
                return resultCount;
            }
        }
 
        /// 
        ///  
        ///    [To be supplied.] 
        /// 
        public bool HasCurve() 
        {
            bool hasCurve = false;

            int status = SafeNativeMethods.Gdip.GdipPathIterHasCurve(new HandleRef(this, nativeIter), out hasCurve); 

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status); 

            return hasCurve; 
        }

        /// 
        ///  
        ///    [To be supplied.]
        ///  
        public void Rewind() 
        {
            int status = SafeNativeMethods.Gdip.GdipPathIterRewind(new HandleRef(this, nativeIter)); 

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 

        ///  
        ///  
        ///    [To be supplied.]
        ///  
        public int Enumerate(ref PointF[] points, ref byte[] types)
        {
            if (points.Length != types.Length)
                throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.InvalidParameter); 

            int resultCount = 0; 
            GPPOINTF pt = new GPPOINTF(); 

            int size =  (int) Marshal.SizeOf(pt.GetType()); 
            int count = points.Length;

            IntPtr memoryPts =  Marshal.AllocHGlobal(count*size);
            try { 
                int status = SafeNativeMethods.Gdip.GdipPathIterEnumerate(new HandleRef(this, nativeIter), out resultCount,
                                memoryPts, types, points.Length); 
 
                if (status != SafeNativeMethods.Gdip.Ok) {
                    throw SafeNativeMethods.Gdip.StatusException(status); 
                }

                points = SafeNativeMethods.Gdip.ConvertGPPOINTFArrayF(memoryPts, points.Length);
            } finally { 
                Marshal.FreeHGlobal(memoryPts);
            } 
 
            return resultCount;
        } 

        /// 
        /// 
        ///    [To be supplied.] 
        /// 
        [SuppressMessage("Microsoft.Design", "CA1045:DoNotPassTypesByReference")] 
        public int CopyData(ref PointF[] points, ref byte[] types, int startIndex, int endIndex) 
        {
            if (points.Length != types.Length) 
                throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.InvalidParameter);

            int resultCount = 0;
            GPPOINTF pt = new GPPOINTF(); 

            int size =  (int)Marshal.SizeOf(pt.GetType()); 
            int count = points.Length; 

            IntPtr memoryPts =  Marshal.AllocHGlobal(count*size); 
            try {
                int status = SafeNativeMethods.Gdip.GdipPathIterCopyData(new HandleRef(this, nativeIter), out resultCount,
                                memoryPts, types, startIndex, endIndex);
 
                if (status != SafeNativeMethods.Gdip.Ok) {
                    throw SafeNativeMethods.Gdip.StatusException(status); 
                } 

                points = SafeNativeMethods.Gdip.ConvertGPPOINTFArrayF(memoryPts, points.Length); 
            } finally {
                Marshal.FreeHGlobal(memoryPts);
            }
 
            return resultCount;
        } 
 
        /*
         * handle to native path iterator object 
         */
        internal IntPtr nativeIter;
    }
 
}

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