Region.cs source code in C# .NET

                        
Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / Region.cs / 1 / Region.cs
                        

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

/*************************************************************************\ 
* 
* Copyright (c) 1998-1999, Microsoft Corp.  All Rights Reserved.
* 
* Module Name:
*
*   Region.cs
* 
* Abstract:
* 
*   COM+ wrapper for GDI+ region objects 
*
* Revision History: 
*
*   12/15/1998 [....]
*       Created it.
* 
\**************************************************************************/
 
namespace System.Drawing { 
    using System.Runtime.InteropServices;
    using System.Diagnostics; 
    using System.Diagnostics.CodeAnalysis;
    using System;
    using Microsoft.Win32;
    using System.ComponentModel; 
    using System.Drawing.Drawing2D;
    using System.Drawing; 
    using System.Drawing.Internal; 
    using System.Globalization;
 

    /**
     * Represent a Region object
     */ 
    /// 
    ///  
    ///     
    ///       Describes the interior of a graphics shape
    ///       composed of rectangles and paths. 
    ///    
    /// 
    public sealed class Region : MarshalByRefObject, IDisposable {
#if FINALIZATION_WATCH 
        private string allocationSite = Graphics.GetAllocationStack();
#endif 
 
        /**
         * Construct a new region object 
         */
        /// 
        /// 
        ///     
        ///       Initializes a new instance of the  class.
        ///     
        ///  
        public Region() {
            IntPtr region = IntPtr.Zero; 

            int status = SafeNativeMethods.Gdip.GdipCreateRegion(out region);

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            SetNativeRegion(region); 
        }
 
        /// 
        /// 
        ///    
        ///       Initializes a new instance of the  class from the specified  . 
        ///    
        ///  
        public Region(RectangleF rect) { 
            IntPtr region = IntPtr.Zero;
 
            GPRECTF gprectf = rect.ToGPRECTF();

            int status = SafeNativeMethods.Gdip.GdipCreateRegionRect(ref gprectf, out region);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
 
            SetNativeRegion(region);
        } 

        /// 
        /// 
        ///     
        ///       Initializes a new instance of the  class from the specified .
        ///     
        ///  
        public Region(Rectangle rect) {
            IntPtr region = IntPtr.Zero; 

            GPRECT gprect = new GPRECT(rect);

            int status = SafeNativeMethods.Gdip.GdipCreateRegionRectI(ref gprect, out region); 

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

            SetNativeRegion(region); 
        }

        /// 
        ///  
        ///    
        ///       Initializes a new instance of the  class 
        ///       with the specified . 
        ///    
        ///  
        public Region(GraphicsPath path) {
            if (path == null)
                throw new ArgumentNullException("path");
 
            IntPtr region = IntPtr.Zero;
 
            int status = SafeNativeMethods.Gdip.GdipCreateRegionPath(new HandleRef(path, path.nativePath), out region); 

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

            SetNativeRegion(region);
        } 

        ///  
        ///  
        ///    Initializes a new instance of the  class
        ///    from the specified data. 
        /// 
        public Region(RegionData rgnData) {
            if (rgnData == null)
                throw new ArgumentNullException("rgnData"); 
            IntPtr region = IntPtr.Zero;
 
            int status = SafeNativeMethods.Gdip.GdipCreateRegionRgnData(rgnData.Data, 
                                                         rgnData.Data.Length,
                                                         out region); 

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            SetNativeRegion(region);
        } 
 
        internal Region(IntPtr nativeRegion) {
            SetNativeRegion(nativeRegion); 
        }

        /// 
        ///  
        ///    Initializes a new instance of the  class
        ///    from the specified existing . 
        ///  
        public static Region FromHrgn(IntPtr hrgn) {
            IntSecurity.ObjectFromWin32Handle.Demand(); 

            IntPtr region = IntPtr.Zero;

            int status = SafeNativeMethods.Gdip.GdipCreateRegionHrgn(new HandleRef(null, hrgn), out region); 

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

            return new Region(region); 
        }

        private void SetNativeRegion(IntPtr nativeRegion) {
            if (nativeRegion == IntPtr.Zero) 
                throw new ArgumentNullException("nativeRegion");
 
            this.nativeRegion = nativeRegion; 
        }
 
        /**
         * Make a copy of the region object
         */
        ///  
        /// 
        ///    Creates an exact copy if this . 
        ///  
        public Region Clone() {
            IntPtr region = IntPtr.Zero; 

            int status = SafeNativeMethods.Gdip.GdipCloneRegion(new HandleRef(this, nativeRegion), out region);

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return new Region(region); 
        }
 
        /**
         * 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 FINALIZATION_WATCH 
            if (!disposing && nativeRegion != IntPtr.Zero)
                Debug.WriteLine("**********************\nDisposed through finalization:\n" + allocationSite); 
#endif
            if (nativeRegion != IntPtr.Zero) {
                try{
#if DEBUG 
                    int status =
#endif 
                    SafeNativeMethods.Gdip.GdipDeleteRegion(new HandleRef(this, nativeRegion)); 
#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{
                    nativeRegion = IntPtr.Zero;
                }
            } 
        }
 
        ///  
        /// 
        ///    Cleans up Windows resources for this 
        /// .
        /// 
        ~Region() {
            Dispose(false); 
        }
 
        /* 
         * Region operations
         */ 

        /// 
        /// 
        ///    Initializes this  to an 
        ///    infinite interior.
        ///  
        public void MakeInfinite() { 
            int status = SafeNativeMethods.Gdip.GdipSetInfinite(new HandleRef(this, nativeRegion));
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
        }
 
        /// 
        ///  
        ///    Initializes this  to an 
        ///    empty interior.
        ///  
        public void MakeEmpty() {
            int status = SafeNativeMethods.Gdip.GdipSetEmpty(new HandleRef(this, nativeRegion));

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 
 
        // float version
        ///  
        /// 
        ///    Updates this  to the intersection of itself
        ///    with the specified .
        ///  
        public void Intersect(RectangleF rect) {
            GPRECTF gprectf = rect.ToGPRECTF(); 
            int status = SafeNativeMethods.Gdip.GdipCombineRegionRect(new HandleRef(this, nativeRegion), ref gprectf, CombineMode.Intersect); 

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

        // int version 
        /// 
        ///  
        ///     
        ///       Updates this  to the intersection of itself with the specified
        ///    . 
        ///    
        /// 
        public void Intersect(Rectangle rect) {
            GPRECT gprect = new GPRECT(rect); 
            int status = SafeNativeMethods.Gdip.GdipCombineRegionRectI(new HandleRef(this, nativeRegion), ref gprect, CombineMode.Intersect);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 

        /// 
        /// 
        ///     
        ///       Updates this  to the intersection of itself with the specified
        ///    . 
        ///     
        /// 
        public void Intersect(GraphicsPath path) { 
            if (path == null)
                throw new ArgumentNullException("path");

            int status = SafeNativeMethods.Gdip.GdipCombineRegionPath(new HandleRef(this, nativeRegion), new HandleRef(path, path.nativePath), CombineMode.Intersect); 

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }
 
        /// 
        /// 
        ///    
        ///       Updates this  to the intersection of itself with the specified 
        ///    .
        ///     
        ///  
        public void Intersect(Region region) {
            if (region == null) 
                throw new ArgumentNullException("region");

            int status = SafeNativeMethods.Gdip.GdipCombineRegionRegion(new HandleRef(this, nativeRegion), new HandleRef(region, region.nativeRegion), CombineMode.Intersect);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        } 

        ///  
        /// 
        ///     Releases the handle to the region handle.
        /// 
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly")] 
        public void ReleaseHrgn(IntPtr regionHandle) {
            IntSecurity.ObjectFromWin32Handle.Demand(); 
            if (regionHandle == IntPtr.Zero) { 
                throw new ArgumentNullException("regionHandle");
            } 

            SafeNativeMethods.IntDeleteObject(new HandleRef(this, regionHandle));
        }
 
        // float version
        ///  
        ///  
        ///    
        ///       Updates this  to the union of itself and the 
        ///       specified .
        ///    
        /// 
        public void Union(RectangleF rect) { 
            GPRECTF gprectf = new GPRECTF(rect);
            int status = SafeNativeMethods.Gdip.GdipCombineRegionRect(new HandleRef(this, nativeRegion), ref gprectf, CombineMode.Union); 
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }

        // int version
        ///  
        /// 
        ///    Updates this  to the union of itself and the 
        ///    specified . 
        /// 
        public void Union(Rectangle rect) { 
            GPRECT gprect = new GPRECT(rect);
            int status = SafeNativeMethods.Gdip.GdipCombineRegionRectI(new HandleRef(this, nativeRegion), ref gprect, CombineMode.Union);

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 
 
        /// 
        ///  
        ///    Updates this  to the union of itself and the
        ///    specified .
        /// 
        public void Union(GraphicsPath path) { 
            if (path == null)
                throw new ArgumentNullException("path"); 
 
            int status = SafeNativeMethods.Gdip.GdipCombineRegionPath(new HandleRef(this, nativeRegion), new HandleRef(path, path.nativePath), CombineMode.Union);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
        }
 
        /// 
        ///  
        ///     
        ///       Updates this  to the union of itself and the specified .
        ///     
        /// 
        public void Union(Region region) {
            if (region == null)
                throw new ArgumentNullException("region"); 

            int status = SafeNativeMethods.Gdip.GdipCombineRegionRegion(new HandleRef(this, nativeRegion), new HandleRef(region, region.nativeRegion), CombineMode.Union); 
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }

        // float version
        ///  
        /// 
        ///    Updates this  to the union minus the 
        ///    intersection of itself with the specified . 
        /// 
        public void Xor(RectangleF rect) { 
            GPRECTF gprectf = new GPRECTF(rect);
            int status = SafeNativeMethods.Gdip.GdipCombineRegionRect(new HandleRef(this, nativeRegion), ref gprectf, CombineMode.Xor);

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 
 
        // int version
        ///  
        /// 
        ///    Updates this  to the union minus the
        ///    intersection of itself with the specified .
        ///  
        public void Xor(Rectangle rect) {
            GPRECT gprect = new GPRECT(rect); 
            int status = SafeNativeMethods.Gdip.GdipCombineRegionRectI(new HandleRef(this, nativeRegion), ref gprect, CombineMode.Xor); 

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

        ///  
        /// 
        ///    Updates this  to the union minus the 
        ///    intersection of itself with the specified . 
        /// 
        public void Xor(GraphicsPath path) { 
            if (path == null)
                throw new ArgumentNullException("path");

            int status = SafeNativeMethods.Gdip.GdipCombineRegionPath(new HandleRef(this, nativeRegion), new HandleRef(path, path.nativePath), CombineMode.Xor); 

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }
 
        /// 
        /// 
        ///    Updates this  to the union minus the
        ///    intersection of itself with the specified . 
        /// 
        public void Xor(Region region) { 
            if (region == null) 
                throw new ArgumentNullException("region");
 
            int status = SafeNativeMethods.Gdip.GdipCombineRegionRegion(new HandleRef(this, nativeRegion), new HandleRef(region, region.nativeRegion), CombineMode.Xor);

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }
 
        // float version 
        /// 
        ///  
        ///    Updates this  to the portion of its interior
        ///    that does not intersect with the specified .
        /// 
        public void Exclude(RectangleF rect) { 
            GPRECTF gprectf = new GPRECTF(rect);
            int status = SafeNativeMethods.Gdip.GdipCombineRegionRect(new HandleRef(this, nativeRegion), ref gprectf, CombineMode.Exclude); 
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }

        // int version
        ///  
        /// 
        ///    Updates this  to the portion of its interior 
        ///    that does not intersect with the specified . 
        /// 
        public void Exclude(Rectangle rect) { 
            GPRECT gprect = new GPRECT(rect);
            int status = SafeNativeMethods.Gdip.GdipCombineRegionRectI(new HandleRef(this, nativeRegion), ref gprect, CombineMode.Exclude);

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 
 
        /// 
        ///  
        ///    Updates this  to the portion of its interior
        ///    that does not intersect with the specified .
        /// 
        public void Exclude(GraphicsPath path) { 
            if (path == null)
                throw new ArgumentNullException("path"); 
 
            int status = SafeNativeMethods.Gdip.GdipCombineRegionPath(new HandleRef(this, nativeRegion), new HandleRef(path, path.nativePath),
                                                       CombineMode.Exclude); 

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

        ///  
        ///  
        ///    Updates this  to the portion of its interior
        ///    that does not intersect with the specified . 
        /// 
        public void Exclude(Region region) {
            if (region == null)
                throw new ArgumentNullException("region"); 

            int status = SafeNativeMethods.Gdip.GdipCombineRegionRegion(new HandleRef(this, nativeRegion), new HandleRef(region, region.nativeRegion), 
                                                         CombineMode.Exclude); 

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

        // float version 
        /// 
        ///  
        ///    Updates this  to the portion of the 
        ///    specified  that does not intersect with this .
        ///  
        public void Complement(RectangleF rect) {
            GPRECTF gprectf = rect.ToGPRECTF();
            int status = SafeNativeMethods.Gdip.GdipCombineRegionRect(new HandleRef(this, nativeRegion), ref gprectf, CombineMode.Complement);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        } 

        // int version 
        /// 
        /// 
        ///    Updates this  to the portion of the
        ///    specified  that does not intersect with this . 
        /// 
        public void Complement(Rectangle rect) { 
            GPRECT gprect = new GPRECT(rect); 
            int status = SafeNativeMethods.Gdip.GdipCombineRegionRectI(new HandleRef(this, nativeRegion), ref gprect, CombineMode.Complement);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
        }
 
        /// 
        ///  
        ///    Updates this  to the portion of the 
        ///    specified  that does not intersect with this
        /// . 
        /// 
        public void Complement(GraphicsPath path) {
            if (path == null)
                throw new ArgumentNullException("path"); 

            int status = SafeNativeMethods.Gdip.GdipCombineRegionPath(new HandleRef(this, nativeRegion), new HandleRef(path, path.nativePath), CombineMode.Complement); 
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }

        /// 
        ///  
        ///    
        ///       Updates this  to the portion of the 
        ///       specified  that does not intersect with this . 
        ///    
        ///  
        public void Complement(Region region) {
            if (region == null)
                throw new ArgumentNullException("region");
 
            int status = SafeNativeMethods.Gdip.GdipCombineRegionRegion(new HandleRef(this, nativeRegion), new HandleRef(region, region.nativeRegion), CombineMode.Complement);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 

        /**
         * Transform operations
         */ 
        /// 
        ///  
        ///    Offsets the coordinates of this  by the 
        ///    specified amount.
        ///  
        public void Translate(float dx, float dy) {
            int status = SafeNativeMethods.Gdip.GdipTranslateRegion(new HandleRef(this, nativeRegion), dx, dy);

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 
 
        /// 
        ///  
        ///    Offsets the coordinates of this  by the
        ///    specified amount.
        /// 
        public void Translate(int dx, int dy) { 
            int status = SafeNativeMethods.Gdip.GdipTranslateRegionI(new HandleRef(this, nativeRegion), dx, dy);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 

        /// 
        /// 
        ///    Transforms this  by the 
        ///    specified .
        ///  
        public void Transform(Matrix matrix) { 
            if (matrix == null)
                throw new ArgumentNullException("matrix"); 

            int status = SafeNativeMethods.Gdip.GdipTransformRegion(new HandleRef(this, nativeRegion),
                                                     new HandleRef(matrix, matrix.nativeMatrix));
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        } 

        /** 
         * Get region attributes
         */
        /// 
        ///  
        ///    Returns a  that represents a rectangular
        ///    region that bounds this  on the drawing surface of a . 
        ///  
        public RectangleF GetBounds(Graphics g) {
            if (g == null) 
                throw new ArgumentNullException("g");

            GPRECTF gprectf = new GPRECTF();
 
            int status = SafeNativeMethods.Gdip.GdipGetRegionBounds(new HandleRef(this, nativeRegion), new HandleRef(g, g.NativeGraphics), ref gprectf);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return gprectf.ToRectangleF();
        }

        ///  
        /// 
        ///    Returns a Windows handle to this  in the 
        ///    specified graphics context. 
        ///
        ///    Remarks from MSDN: 
        ///         It is the caller's responsibility to call the GDI function
        ///         DeleteObject to free the GDI region when it is no longer needed.
        /// 
        public IntPtr GetHrgn(Graphics g) { 
            if (g == null)
                throw new ArgumentNullException("g"); 
 
            IntPtr hrgn = IntPtr.Zero;
 
            int status = SafeNativeMethods.Gdip.GdipGetRegionHRgn(new HandleRef(this, nativeRegion), new HandleRef(g, g.NativeGraphics), out hrgn);

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

            return hrgn; 
        } 

        ///  
        /// 
        ///    
        ///       Tests whether this  has an
        ///       empty interior on the specified drawing surface. 
        ///    
        ///  
        public bool IsEmpty(Graphics g) { 
            if (g == null)
                throw new ArgumentNullException("g"); 

            int isEmpty;
            int status = SafeNativeMethods.Gdip.GdipIsEmptyRegion(new HandleRef(this, nativeRegion), new HandleRef(g, g.NativeGraphics), out isEmpty);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
 
            return isEmpty != 0;
        } 

        /// 
        /// 
        ///     
        ///       Tests whether this  has
        ///       an infinite interior on the specified drawing surface. 
        ///     
        /// 
        public bool IsInfinite(Graphics g) { 
            if (g == null)
                throw new ArgumentNullException("g");

            int isInfinite; 
            int status = SafeNativeMethods.Gdip.GdipIsInfiniteRegion(new HandleRef(this, nativeRegion), new HandleRef(g, g.NativeGraphics), out isInfinite);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return isInfinite != 0;
        }

        ///  
        /// 
        ///     
        ///       Tests whether the specified  is 
        ///       identical to this 
        ///       on the specified drawing surface. 
        ///    
        /// 
        public bool Equals(Region region, Graphics g) {
            if (g == null) 
                throw new ArgumentNullException("g");
 
            if (region == null) 
                throw new ArgumentNullException("region");
 
            int isEqual;
            int status = SafeNativeMethods.Gdip.GdipIsEqualRegion(new HandleRef(this, nativeRegion), new HandleRef(region, region.nativeRegion), new HandleRef(g, g.NativeGraphics), out isEqual);

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return isEqual != 0; 
        }
 
        /// 
        /// 
        ///    Returns a  that represents the
        ///    information that describes this . 
        /// 
        public RegionData GetRegionData() { 
 
            int regionSize = 0;
 
            int status = SafeNativeMethods.Gdip.GdipGetRegionDataSize(new HandleRef(this, nativeRegion), out regionSize);

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

            if (regionSize == 0) 
                return null; 

            byte[] regionData = new byte[regionSize]; 

            status = SafeNativeMethods.Gdip.GdipGetRegionData(new HandleRef(this, nativeRegion), regionData, regionSize, out regionSize);

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return new RegionData(regionData); 
        }
 
        /*
         * Hit testing operations
         */
        // float version 
        /// 
        ///  
        ///     
        ///       Tests whether the specified point is
        ///       contained within this  in the specified graphics context. 
        ///    
        /// 
        public bool IsVisible(float x, float y) {
            return IsVisible(new PointF(x, y), null); 
        }
 
        ///  
        /// 
        ///     
        ///       Tests whether the specified  is contained within this .
        ///    
        /// 
        public bool IsVisible(PointF point) { 
            return IsVisible(point, null);
        } 
 
        /// 
        ///  
        ///    
        ///       Tests whether the specified point is contained within this  in the
        ///       specified graphics context.
        ///     
        /// 
        public bool IsVisible(float x, float y, Graphics g) { 
            return IsVisible(new PointF(x, y), g); 
        }
 
        /// 
        /// 
        ///    
        ///       Tests whether the specified  is 
        ///       contained within this  in the specified graphics context.
        ///     
        ///  
        public bool IsVisible(PointF point, Graphics g) {
            int isVisible; 

            int status = SafeNativeMethods.Gdip.GdipIsVisibleRegionPoint(new HandleRef(this, nativeRegion), point.X, point.Y,
                                                          new HandleRef(g, (g==null) ? IntPtr.Zero : g.NativeGraphics),
                                                          out isVisible); 

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

            return isVisible != 0; 
        }

        /// 
        ///  
        ///    
        ///       Tests whether the specified rectangle is contained within this  
        ///       . 
        ///    
        ///  
        public bool IsVisible(float x, float y, float width, float height) {
            return IsVisible(new RectangleF(x, y, width, height), null);
        }
 
        /// 
        ///  
        ///     
        ///       Tests whether the specified  is contained within this
        ///    . 
        ///    
        /// 
        public bool IsVisible(RectangleF rect) {
            return IsVisible(rect, null); 
        }
 
        ///  
        /// 
        ///     
        ///       Tests whether the specified rectangle is contained within this  in the
        ///       specified graphics context.
        ///    
        ///  
        public bool IsVisible(float x, float y, float width, float height, Graphics g) {
            return IsVisible(new RectangleF(x, y, width, height), g); 
        } 

        ///  
        /// 
        ///    
        ///       Tests whether the specified  is contained within this  in the specified graphics context.
        ///     
        /// 
        public bool IsVisible(RectangleF rect, Graphics g) { 
 
            int isVisible = 0;
            int status = SafeNativeMethods.Gdip.GdipIsVisibleRegionRect(new HandleRef(this, nativeRegion), rect.X, rect.Y, 
                                                         rect.Width, rect.Height,
                                                         new HandleRef(g, (g==null) ? IntPtr.Zero : g.NativeGraphics),
                                                         out isVisible);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
 
            return isVisible != 0;
        } 

        // int version
        /// 
        ///  
        ///    
        ///       Tests whether the specified point is contained within this  in the 
        ///       specified graphics context. 
        ///    
        ///  
        public bool IsVisible(int x, int y, Graphics g) {
            return IsVisible(new Point(x, y), g);
        }
 
        /// 
        ///  
        ///     
        ///       Tests whether the specified  is contained within this .
        ///     
        /// 
        public bool IsVisible(Point point) {
            return IsVisible(point, null);
        } 

        ///  
        ///  
        ///    
        ///       Tests whether the specified  is contained within this 
        ///     in the specified
        ///       graphics context.
        ///    
        ///  
        public bool IsVisible(Point point, Graphics g) {
            int isVisible = 0; 
            int status = SafeNativeMethods.Gdip.GdipIsVisibleRegionPointI(new HandleRef(this, nativeRegion), point.X, point.Y, 
                                                           new HandleRef(g, (g == null) ? IntPtr.Zero : g.NativeGraphics),
                                                           out isVisible); 

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return isVisible != 0;
        } 
 
        /// 
        ///  
        ///    
        ///       Tests whether the specified rectangle is contained within this 
        ///       .
        ///     
        /// 
        public bool IsVisible(int x, int y, int width, int height) { 
            return IsVisible(new Rectangle(x, y, width, height), null); 
        }
 
        /// 
        /// 
        ///    
        ///       Tests whether the specified  is contained within this 
        ///    .
        ///     
        ///  
        public bool IsVisible(Rectangle rect) {
            return IsVisible(rect, null); 
        }

        /// 
        ///  
        ///    
        ///       Tests whether the specified rectangle is contained within this  in the 
        ///       specified graphics context. 
        ///    
        ///  
        public bool IsVisible(int x, int y, int width, int height, Graphics g) {
            return IsVisible(new Rectangle(x, y, width, height), g);
        }
 
        /// 
        ///  
        ///     
        ///       Tests whether the specified  is contained within this
        ///     
        ///    in the specified graphics context.
        /// 
        /// 
        public bool IsVisible(Rectangle rect, Graphics g) { 

            int isVisible = 0; 
            int status = SafeNativeMethods.Gdip.GdipIsVisibleRegionRectI(new HandleRef(this, nativeRegion), rect.X, rect.Y, 
                                                          rect.Width, rect.Height,
                                                          new HandleRef(g, (g == null) ? IntPtr.Zero : g.NativeGraphics), 
                                                          out isVisible);

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

            return isVisible != 0; 
        } 

        ///  
        /// 
        ///    
        ///       Returns an array of 
        ///       objects that approximate this Region on the specified 
        ///    
        ///  
        [SuppressMessage("Microsoft.Performance", "CA1808:AvoidCallsThatBoxValueTypes")] 
        public RectangleF[] GetRegionScans(Matrix matrix) {
            if (matrix == null) 
                throw new ArgumentNullException("matrix");

            int count = 0;
 
            // call first time to get actual count of rectangles
 
            int status = SafeNativeMethods.Gdip.GdipGetRegionScansCount(new HandleRef(this, nativeRegion), 
                                                         out count,
                                                         new HandleRef(matrix, matrix.nativeMatrix)); 

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            RectangleF[] rectangles;
            int rectsize = (int)Marshal.SizeOf(typeof(GPRECTF)); 
            IntPtr memoryRects = Marshal.AllocHGlobal(rectsize*count); 

            try { 
                status = SafeNativeMethods.Gdip.GdipGetRegionScans(new HandleRef(this, nativeRegion),
                    memoryRects,
                    out count,
                    new HandleRef(matrix, matrix.nativeMatrix)); 

                if (status != SafeNativeMethods.Gdip.Ok) { 
                    throw SafeNativeMethods.Gdip.StatusException(status); 
                }
 
                int index;
                GPRECTF gprectf = new GPRECTF();

                rectangles = new RectangleF[count]; 

                for (index=0; index

                        

                        
                        
                    

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