CustomLineCap.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / Advanced / CustomLineCap.cs / 1 / CustomLineCap.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/*************************************************************************\ 
* 
* Copyright (c) 1998-2000, Microsoft Corp.  All Rights Reserved.
* 
* Module Name:
*
*   CustomLineCap.cs
* 
* Abstract:
* 
*   Native GDI+ CustomLineCap structure. 
*
* Revision History: 
*
*   3/14/2k [....]
*       Created it.
* 
\**************************************************************************/
 
namespace System.Drawing.Drawing2D { 

    using Microsoft.Win32; 
    using System;
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Drawing; 
    using System.Drawing.Internal;
    using System.Runtime.InteropServices; 
    using System.Globalization; 

    ///  
    /// 
    ///    Encapsulates a custom user-defined line
    ///    cap.
    ///  
    public class CustomLineCap : MarshalByRefObject, ICloneable, IDisposable {
 
#if FINALIZATION_WATCH 
        private string allocationSite = Graphics.GetAllocationStack();
#endif 


        /*
         * Handle to native line cap object 
         */
 
        internal IntPtr nativeCap; 

        // For subclass creation 
        internal CustomLineCap() {}

        /// 
        ///  
        ///    
        ///       Initializes a new instance of the  class with the specified outline 
        ///       and fill. 
        ///    
        ///  
        public CustomLineCap(GraphicsPath fillPath,
                             GraphicsPath strokePath) :
            this(fillPath, strokePath, LineCap.Flat) {}
 
        /// 
        ///  
        ///     
        ///       Initializes a new instance of the  class from the
        ///       specified existing  with the specified outline and 
        ///       fill.
        ///    
        /// 
        public CustomLineCap(GraphicsPath fillPath, 
                             GraphicsPath strokePath,
                             LineCap baseCap) : 
            this(fillPath, strokePath, baseCap, 0) {} 

        ///  
        /// 
        ///    
        ///       Initializes a new instance of the  class from the
        ///       specified existing  with the specified outline, fill, and 
        ///       inset.
        ///     
        ///  
        public CustomLineCap(GraphicsPath fillPath,
                             GraphicsPath strokePath, 
                             LineCap baseCap,
                             float baseInset)
        {
            IntPtr nativeCap = IntPtr.Zero; 

            int status = SafeNativeMethods.Gdip.GdipCreateCustomLineCap( 
                                new HandleRef(fillPath, (fillPath == null) ? IntPtr.Zero : fillPath.nativePath), 
                                new HandleRef(strokePath, (strokePath == null) ? IntPtr.Zero : strokePath.nativePath),
                                baseCap, baseInset, out nativeCap); 

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            SetNativeLineCap(nativeCap);
        } 
 
        internal CustomLineCap(IntPtr nativeLineCap)
        { 
            SetNativeLineCap(nativeLineCap);
        }

        internal void SetNativeLineCap(IntPtr handle) { 
            if (handle == IntPtr.Zero)
                throw new ArgumentNullException("handle"); 
 
            nativeCap = handle;
        } 

        /// 
        /// 
        ///    Cleans up Windows resources for this 
        /// .
        ///  
        public void Dispose() { 
            Dispose(true);
            GC.SuppressFinalize(this); 
        }

        /// 
        protected virtual void Dispose(bool disposing) { 
#if FINALIZATION_WATCH
            if (!disposing && nativeCap != IntPtr.Zero) 
                Debug.WriteLine("**********************\nDisposed through finalization:\n" + allocationSite); 
#endif
 
            if (nativeCap != IntPtr.Zero) {
                try{
#if DEBUG
                    int status = 
#endif
                    SafeNativeMethods.Gdip.GdipDeleteCustomLineCap(new HandleRef(this, nativeCap)); 
#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{ 
                    nativeCap = IntPtr.Zero;
                }
            }
        } 

        ///  
        ///  
        ///    Cleans up Windows resources for this
        /// . 
        /// 
        ~CustomLineCap() {
            Dispose(false);
        } 

        ///  
        ///  
        ///    Creates an exact copy of this .
        ///  
        public object Clone()
        {
            IntPtr cloneCap = IntPtr.Zero;
 
            int status = SafeNativeMethods.Gdip.GdipCloneCustomLineCap(new HandleRef(this, nativeCap), out cloneCap);
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return CustomLineCap.CreateCustomLineCapObject(cloneCap);
       }

       internal static CustomLineCap CreateCustomLineCapObject(IntPtr cap) 
       {
            CustomLineCapType capType = 0; 
 
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapType(new HandleRef(null, cap), out capType);
 
            if (status != SafeNativeMethods.Gdip.Ok)
            {
                SafeNativeMethods.Gdip.GdipDeleteCustomLineCap(new HandleRef(null, cap));
                throw SafeNativeMethods.Gdip.StatusException(status); 
            }
 
            switch (capType) 
            {
            case CustomLineCapType.Default: 
                return new CustomLineCap(cap);

            case CustomLineCapType.AdjustableArrowCap:
                return new AdjustableArrowCap(cap); 
            }
 
            SafeNativeMethods.Gdip.GdipDeleteCustomLineCap(new HandleRef(null, cap)); 
            throw SafeNativeMethods.Gdip.StatusException(SafeNativeMethods.Gdip.NotImplemented);
        } 

        /// 
        /// 
        ///    Sets the caps used to start and end lines. 
        /// 
        public void SetStrokeCaps(LineCap startCap, LineCap endCap) 
        { 
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapStrokeCaps(new HandleRef(this, nativeCap), startCap, endCap);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
        }
 
        /// 
        ///  
        ///    Gets the caps used to start and end lines. 
        /// 
        public void GetStrokeCaps(out LineCap startCap, out LineCap endCap) 
        {
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapStrokeCaps(new HandleRef(this, nativeCap), out startCap, out endCap);

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 
 
        private void _SetStrokeJoin(LineJoin lineJoin)
        { 
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapStrokeJoin(new HandleRef(this, nativeCap), lineJoin);

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }
 
        private LineJoin _GetStrokeJoin() 
        {
            LineJoin lineJoin; 

            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapStrokeJoin(new HandleRef(this, nativeCap), out lineJoin);

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return lineJoin; 
        }
 
        /// 
        /// 
        ///    Gets or sets the  used by this custom cap.
        ///  
        public LineJoin StrokeJoin
        { 
            get { return _GetStrokeJoin(); } 
            set { _SetStrokeJoin(value); }
        } 

        private void _SetBaseCap(LineCap baseCap)
        {
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapBaseCap(new HandleRef(this, nativeCap), baseCap); 

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }
 
        private LineCap _GetBaseCap()
        {
            LineCap baseCap;
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapBaseCap(new HandleRef(this, nativeCap), out baseCap); 

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

            return baseCap; 
        }

        /// 
        ///  
        ///    Gets or sets the  on which this  is based.
        ///  
        public LineCap BaseCap 
        {
            get { return _GetBaseCap(); } 
            set { _SetBaseCap(value); }
        }

        private void _SetBaseInset(float inset) 
        {
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapBaseInset(new HandleRef(this, nativeCap), inset); 
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }

        private float _GetBaseInset()
        { 
            float inset;
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapBaseInset(new HandleRef(this, nativeCap), out inset); 
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 

            return inset;
        }
 
        /// 
        ///  
        ///    Gets or sets the distance between the cap 
        ///    and the line.
        ///  
        public float BaseInset
        {
            get { return _GetBaseInset(); }
            set { _SetBaseInset(value); } 
        }
 
        private void _SetWidthScale(float widthScale) 
        {
            int status = SafeNativeMethods.Gdip.GdipSetCustomLineCapWidthScale(new HandleRef(this, nativeCap), widthScale); 

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

        private float _GetWidthScale() 
        { 
            float widthScale;
            int status = SafeNativeMethods.Gdip.GdipGetCustomLineCapWidthScale(new HandleRef(this, nativeCap), out widthScale); 

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            return widthScale;
        } 
 
        /// 
        ///  
        ///    Gets or sets the amount by which to scale
        ///    the width of the cap.
        /// 
        public float WidthScale 
        {
            get { return _GetWidthScale(); } 
            set { _SetWidthScale(value); } 
        }
    } 
}

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