LinearGradientBrush.cs source code in C# .NET

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Code:

/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / Advanced / LinearGradientBrush.cs / 1 / LinearGradientBrush.cs

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

/*************************************************************************\ 
* 
* Copyright (c) 1998-2000, Microsoft Corp.  All Rights Reserved.
* 
* Module Name:
*
*   LinearGradientBrush.cs
* 
* Abstract:
* 
*   COM+ wrapper for GDI+ LinearGradient objects 
*
* Revision History: 
*
*   01/11/1999 davidx
*       Code review.
* 
*   12/15/1998 [....]
*       Created it. 
* 
*   3/14/2000 [....]
*       Renamed LineGradientBrush to LinearGradientBrush 
*
\**************************************************************************/

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

    /** 
     * Represent a LinearGradient brush object
     */ 
    ///  
    /// 
    ///     
    ///       Encapsulates a  with a linear gradient.
    ///    
    /// 
    public sealed class LinearGradientBrush : Brush { 

        private bool interpolationColorsWasSet; 
 
        /**
         * Create a new rectangle gradient brush object 
         */
        /// 
        /// 
        ///    Initializes a new instance of the  class with the specified points and 
        ///    colors.
        ///  
        public LinearGradientBrush(PointF point1, PointF point2, 
                                   Color color1, Color color2)
        { 
            IntPtr brush = IntPtr.Zero;

            int status = SafeNativeMethods.Gdip.GdipCreateLineBrush(new GPPOINTF(point1),
                                                     new GPPOINTF(point2), 
                                                     color1.ToArgb(),
                                                     color2.ToArgb(), 
                                                     (int)WrapMode.Tile, 
                                                     out brush);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);

            SetNativeBrush(brush); 
        }
 
        ///  
        /// 
        ///     
        ///       Initializes a new instance of the  class with the
        ///       specified points and colors.
        ///    
        ///  
        public LinearGradientBrush(Point point1, Point point2,
                                   Color color1, Color color2) 
        { 
            IntPtr brush = IntPtr.Zero;
 
            int status = SafeNativeMethods.Gdip.GdipCreateLineBrushI(new GPPOINT(point1),
                                                      new GPPOINT(point2),
                                                      color1.ToArgb(),
                                                      color2.ToArgb(), 
                                                      (int)WrapMode.Tile,
                                                      out brush); 
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 

            SetNativeBrush(brush);
        }
 
        /// 
        ///  
        ///     
        ///       Encapsulates a new instance of the  class with
        ///       the specified points, colors, and orientation. 
        ///    
        /// 
        public LinearGradientBrush(RectangleF rect, Color color1, Color color2,
                                   LinearGradientMode linearGradientMode) 
        {
            //validate the LinearGradientMode enum 
            //valid values are 0x0 to 0x3 
            if (!ClientUtils.IsEnumValid(linearGradientMode, (int)linearGradientMode, (int)LinearGradientMode.Horizontal, (int)LinearGradientMode.BackwardDiagonal)){
                throw new InvalidEnumArgumentException("linearGradientMode", (int)linearGradientMode, typeof(LinearGradientMode)); 
            }

            //validate the rect
            if (rect.Width == 0.0 || rect.Height == 0.0) { 
                throw new ArgumentException(SR.GetString(SR.GdiplusInvalidRectangle, rect.ToString()));
            } 
 
            IntPtr brush = IntPtr.Zero;
 
            GPRECTF gprectf = new GPRECTF(rect);
            int status = SafeNativeMethods.Gdip.GdipCreateLineBrushFromRect(ref gprectf,
                                                             color1.ToArgb(),
                                                             color2.ToArgb(), 
                                                             (int) linearGradientMode,
                                                             (int)WrapMode.Tile, 
                                                             out brush); 

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

            SetNativeBrush(brush);
        } 

        ///  
        ///  
        ///    
        ///       Encapsulates a new instance of the  class with the 
        ///       specified points, colors, and orientation.
        ///    
        /// 
        public LinearGradientBrush(Rectangle rect, Color color1, Color color2, 
                                   LinearGradientMode linearGradientMode)
        { 
            //validate the LinearGradientMode enum 
            //valid values are 0x0 to 0x3
            if (!ClientUtils.IsEnumValid(linearGradientMode, (int)linearGradientMode, (int)LinearGradientMode.Horizontal, (int)LinearGradientMode.BackwardDiagonal)) 
            {
                throw new InvalidEnumArgumentException("linearGradientMode", (int)linearGradientMode, typeof(LinearGradientMode));
            }
 
            //validate the rect
            if (rect.Width == 0 || rect.Height == 0) { 
                throw new ArgumentException(SR.GetString(SR.GdiplusInvalidRectangle, rect.ToString())); 
            }
 
            IntPtr brush = IntPtr.Zero;

            GPRECT gpRect = new GPRECT(rect);
            int status = SafeNativeMethods.Gdip.GdipCreateLineBrushFromRectI(ref gpRect, 
                                                              color1.ToArgb(),
                                                              color2.ToArgb(), 
                                                              (int) linearGradientMode, 
                                                              (int)WrapMode.Tile,
                                                              out brush); 

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
 
            SetNativeBrush(brush);
        } 
 
        /// 
        ///  
        ///    
        ///       Encapsulates a new instance of the  class with the
        ///       specified points, colors, and orientation.
        ///     
        /// 
        public LinearGradientBrush(RectangleF rect, Color color1, Color color2, 
                                 float angle) 
            : this(rect, color1, color2, angle, false) {}
 
        /// 
        /// 
        ///    
        ///       Encapsulates a new instance of the  class with the 
        ///       specified points, colors, and orientation.
        ///     
        ///  
        public LinearGradientBrush(RectangleF rect, Color color1, Color color2,
                                 float angle, bool isAngleScaleable) 
        {
            IntPtr brush = IntPtr.Zero;

            //validate the rect 
            if (rect.Width == 0.0 || rect.Height == 0.0) {
                throw new ArgumentException(SR.GetString(SR.GdiplusInvalidRectangle, rect.ToString())); 
            } 

            GPRECTF gprectf = new GPRECTF(rect); 
            int status = SafeNativeMethods.Gdip.GdipCreateLineBrushFromRectWithAngle(ref gprectf,
                                                                      color1.ToArgb(),
                                                                      color2.ToArgb(),
                                                                      angle, 
                                                                      isAngleScaleable,
                                                                      (int)WrapMode.Tile, 
                                                                      out brush); 

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

            SetNativeBrush(brush);
        } 

        ///  
        ///  
        ///    
        ///       Encapsulates a new instance of the  class with the 
        ///       specified points, colors, and orientation.
        ///    
        /// 
        public LinearGradientBrush(Rectangle rect, Color color1, Color color2, 
                                   float angle)
            : this(rect, color1, color2, angle, false) { 
        } 

        ///  
        /// 
        ///    
        ///       Encapsulates a new instance of the  class with the
        ///       specified points, colors, and orientation. 
        ///    
        ///  
        public LinearGradientBrush(Rectangle rect, Color color1, Color color2, 
                                 float angle, bool isAngleScaleable)
        { 
            IntPtr brush = IntPtr.Zero;

            //validate the rect
            if (rect.Width == 0 || rect.Height == 0) { 
                throw new ArgumentException(SR.GetString(SR.GdiplusInvalidRectangle, rect.ToString()));
            } 
 
            GPRECT gprect = new GPRECT(rect);
            int status = SafeNativeMethods.Gdip.GdipCreateLineBrushFromRectWithAngleI(ref gprect, 
                                                                       color1.ToArgb(),
                                                                       color2.ToArgb(),
                                                                       angle,
                                                                       isAngleScaleable, 
                                                                       (int)WrapMode.Tile,
                                                                       out brush); 
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 

            SetNativeBrush(brush);
        }
 
        /// 
        ///     Constructor to initialized this object to be owned by GDI+. 
        ///  
        internal LinearGradientBrush(IntPtr nativeBrush )
        { 
            Debug.Assert( nativeBrush != IntPtr.Zero, "Initializing native brush with null." );
            SetNativeBrush( nativeBrush );
        }
 
        /// 
        ///  
        ///    Creates an exact copy of this . 
        /// 
        public override object Clone() { 
            IntPtr cloneBrush = IntPtr.Zero;

            int status = SafeNativeMethods.Gdip.GdipCloneBrush(new HandleRef(this, this.NativeBrush), out cloneBrush);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
 
            return new LinearGradientBrush(cloneBrush);
        } 

        /**
         * Get/set colors
         */ 

        private void _SetLinearColors(Color color1, Color color2) 
        { 
            int status = SafeNativeMethods.Gdip.GdipSetLineColors(new HandleRef(this, this.NativeBrush),
                                                   color1.ToArgb(), 
                                                   color2.ToArgb());

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }
 
        private Color[] _GetLinearColors() 
        {
            int[] colors = 
            new int[]
            {
                0,
                0 
            };
 
            int status = SafeNativeMethods.Gdip.GdipGetLineColors(new HandleRef(this, this.NativeBrush), colors); 

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

            Color[] lineColor = new Color[2];
 
            lineColor[0] = Color.FromArgb(colors[0]);
            lineColor[1] = Color.FromArgb(colors[1]); 
 
            return lineColor;
        } 

        /// 
        /// 
        ///    Gets or sets the starting and ending colors of the 
        ///    gradient.
        ///  
        public Color[] LinearColors 
        {
            get { return _GetLinearColors();} 
            set { _SetLinearColors(value[0], value[1]);}
        }

        /** 
         * Get source rectangle
         */ 
        private RectangleF _GetRectangle() { 
            GPRECTF rect = new GPRECTF();
 
            int status = SafeNativeMethods.Gdip.GdipGetLineRect(new HandleRef(this, this.NativeBrush), ref rect);

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

            return rect.ToRectangleF(); 
        } 

        ///  
        /// 
        ///    
        ///       Gets a rectangular region that defines the
        ///       starting and ending points of the gradient. 
        ///    
        ///  
        public RectangleF Rectangle 
        {
            get { return _GetRectangle(); } 
        }

        /// 
        ///  
        ///    
        ///       Gets or sets a value indicating whether 
        ///       gamma correction is enabled for this . 
        ///    
        ///  
        public bool GammaCorrection
        {
            get {
                bool useGammaCorrection; 

                int status = SafeNativeMethods.Gdip.GdipGetLineGammaCorrection(new HandleRef(this, this.NativeBrush), 
                                                       out useGammaCorrection); 
                if (status != SafeNativeMethods.Gdip.Ok)
                    throw SafeNativeMethods.Gdip.StatusException(status); 

                return useGammaCorrection;
            }
            set { 
                int status = SafeNativeMethods.Gdip.GdipSetLineGammaCorrection(new HandleRef(this, this.NativeBrush),
                                                        value); 
                if (status != SafeNativeMethods.Gdip.Ok) 
                    throw SafeNativeMethods.Gdip.StatusException(status);
            } 
        }

        /**
         * Get/set blend factors 
         *
         * @notes If the blendFactors.Length = 1, then it's treated 
         *  as the falloff parameter. Otherwise, it's the array 
         *  of blend factors.
         */ 

        private Blend _GetBlend() {

            // VSWHidbey 518309 - interpolation colors and blends don't get along.  Just getting 
            // the Blend when InterpolationColors was set puts the Brush into an unusable state afterwards.
            // so to avoid that (mostly the problem of having Blend pop up in the debugger window and cause this problem) 
            // we just bail here. 
            //
            if (interpolationColorsWasSet) {
 
                return null;
            }

            Blend blend; 

            // Figure out the size of blend factor array 
            int retval = 0; 
            int status = SafeNativeMethods.Gdip.GdipGetLineBlendCount(new HandleRef(this, this.NativeBrush), out retval);
 
            if (status != SafeNativeMethods.Gdip.Ok) {
                throw SafeNativeMethods.Gdip.StatusException(status);
            }
            if (retval <= 0) { 
                return null;
            } 
 
            // Allocate temporary native memory buffer
            int count = retval; 

            IntPtr factors = IntPtr.Zero;
            IntPtr positions = IntPtr.Zero;
 
            try {
                factors = Marshal.AllocHGlobal(4*count); 
                positions = Marshal.AllocHGlobal(4*count); 

                // Retrieve horizontal blend factors 
                status = SafeNativeMethods.Gdip.GdipGetLineBlend(new HandleRef(this, this.NativeBrush), factors, positions, count);

                if (status != SafeNativeMethods.Gdip.Ok) {
                    throw SafeNativeMethods.Gdip.StatusException(status); 
                }
 
                // Return the result in a managed array 
                blend = new Blend(count);
 
                Marshal.Copy(factors, blend.Factors, 0, count);
                Marshal.Copy(positions, blend.Positions, 0, count);
            }
            finally { 
                if( factors != IntPtr.Zero ){
                    Marshal.FreeHGlobal(factors); 
                } 
                if( positions != IntPtr.Zero ){
                    Marshal.FreeHGlobal(positions); 
                }
            }

            return blend; 
        }
 
        private void _SetBlend(Blend blend) { 
            // Allocate temporary native memory buffer
            // and copy input blend factors into it. 

            int count = blend.Factors.Length;

            IntPtr factors = IntPtr.Zero; 
            IntPtr positions = IntPtr.Zero;
 
            try { 
                factors = Marshal.AllocHGlobal(4*count);
                positions = Marshal.AllocHGlobal(4*count); 

                Marshal.Copy(blend.Factors, 0, factors, count);
                Marshal.Copy(blend.Positions, 0, positions, count);
 
                // Set blend factors
 
                int status = SafeNativeMethods.Gdip.GdipSetLineBlend(new HandleRef(this, this.NativeBrush), new HandleRef(null, factors), new HandleRef(null, positions), count); 

                if (status != SafeNativeMethods.Gdip.Ok) { 
                    throw SafeNativeMethods.Gdip.StatusException(status);
                }
            }
            finally{ 
                if( factors != IntPtr.Zero ) {
                    Marshal.FreeHGlobal(factors); 
                } 
                if( positions != IntPtr.Zero ) {
                    Marshal.FreeHGlobal(positions); 
                }
            }
        }
 
        /// 
        ///  
        ///    Gets or sets a  that specifies 
        ///    positions and factors that define a custom falloff for the gradient.
        ///  
        public Blend Blend
        {
            get { return _GetBlend();}
            set { _SetBlend(value);} 
        }
 
        /* 
         * SigmaBlend & LinearBlend not yet implemented
         */ 

        /// 
        /// 
        ///    Creates a gradient falloff based on a 
        ///    bell-shaped curve.
        ///  
        public void SetSigmaBellShape(float focus) 
        {
            SetSigmaBellShape(focus, (float)1.0); 
        }

        /// 
        ///  
        ///    Creates a gradient falloff based on a
        ///    bell-shaped curve. 
        ///  
        public void SetSigmaBellShape(float focus, float scale)
        { 
            int status = SafeNativeMethods.Gdip.GdipSetLineSigmaBlend(new HandleRef(this, this.NativeBrush), focus, scale);

            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }
 
        ///  
        /// 
        ///     
        ///       Creates a triangular gradient.
        ///    
        /// 
        public void SetBlendTriangularShape(float focus) 
        {
            SetBlendTriangularShape(focus, (float)1.0); 
        } 

        ///  
        /// 
        ///    
        ///       Creates a triangular gradient.
        ///     
        /// 
        public void SetBlendTriangularShape(float focus, float scale) 
        { 
            int status = SafeNativeMethods.Gdip.GdipSetLineLinearBlend(new HandleRef(this, this.NativeBrush), focus, scale);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status);
        }
 
        /*
         * Preset Color Blend 
         */ 

        private ColorBlend _GetInterpolationColors() { 
            ColorBlend blend;

            if (!interpolationColorsWasSet) {
                throw new ArgumentException(SR.GetString(SR.InterpolationColorsCommon, 
                                            SR.GetString(SR.InterpolationColorsColorBlendNotSet),""));
            } 
            // Figure out the size of blend factor array 

            int retval = 0; 
            int status = SafeNativeMethods.Gdip.GdipGetLinePresetBlendCount(new HandleRef(this, this.NativeBrush), out retval);

            if (status != SafeNativeMethods.Gdip.Ok) {
                throw SafeNativeMethods.Gdip.StatusException(status); 
            }
 
            // Allocate temporary native memory buffer 

            int count = retval; 

            IntPtr colors = IntPtr.Zero;
            IntPtr positions = IntPtr.Zero;
 
            try {
                colors = Marshal.AllocHGlobal(4*count); 
                positions = Marshal.AllocHGlobal(4*count); 

                // Retrieve horizontal blend factors 

                status = SafeNativeMethods.Gdip.GdipGetLinePresetBlend(new HandleRef(this, this.NativeBrush), colors, positions, count);

                if (status != SafeNativeMethods.Gdip.Ok) { 
                    throw SafeNativeMethods.Gdip.StatusException(status);
                } 
 
                // Return the result in a managed array
 
                blend = new ColorBlend(count);

                int[] argb = new int[count];
                Marshal.Copy(colors, argb, 0, count); 
                Marshal.Copy(positions, blend.Positions, 0, count);
 
                // copy ARGB values into Color array of ColorBlend 
                blend.Colors = new Color[argb.Length];
 
                for (int i=0; i 
        /// 
        ///     
        ///       Gets or sets a  that defines a multi-color linear 
        ///       gradient.
        ///     
        /// 
        public ColorBlend InterpolationColors
        {
            get { return _GetInterpolationColors();} 
            set { _SetInterpolationColors(value);}
        } 
 
        /**
         * Set/get brush wrapping mode 
         */
        private void _SetWrapMode(WrapMode wrapMode) {
            int status = SafeNativeMethods.Gdip.GdipSetLineWrapMode(new HandleRef(this, this.NativeBrush), (int) wrapMode);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        } 

        private WrapMode _GetWrapMode() { 
            int mode = 0;

            int status = SafeNativeMethods.Gdip.GdipGetLineWrapMode(new HandleRef(this, this.NativeBrush), out mode);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
 
            return (WrapMode) mode;
        } 

        /// 
        /// 
        ///     
        ///       Gets or sets a  that indicates the wrap mode for this .
        ///     
        ///  
        public WrapMode WrapMode
        { 
            get {
                return _GetWrapMode();
            }
            set { 
                //validate the WrapMode enum
                //valid values are 0x0 to 0x4 
                if (!ClientUtils.IsEnumValid(value, (int)value, (int)WrapMode.Tile, (int)WrapMode.Clamp)) 
                {
                    throw new InvalidEnumArgumentException("value", (int)value, typeof(WrapMode)); 
                }

                _SetWrapMode(value);
            } 
        }
 
        /** 
         * Set/get brush transform
         */ 
        private void _SetTransform(Matrix matrix) {
            if (matrix == null)
                throw new ArgumentNullException("matrix");
 
            int status = SafeNativeMethods.Gdip.GdipSetLineTransform(new HandleRef(this, this.NativeBrush), new HandleRef(matrix, matrix.nativeMatrix));
 
            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        } 

        private Matrix _GetTransform() {
            Matrix matrix = new Matrix();
 
            // NOTE: new Matrix() will throw an exception if matrix == null.
 
            int status = SafeNativeMethods.Gdip.GdipGetLineTransform(new HandleRef(this, this.NativeBrush), new HandleRef(matrix, matrix.nativeMatrix)); 

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

            return matrix;
        } 

        ///  
        ///  
        ///    
        ///       Gets or sets a  that defines a local geometrical transform for 
        ///       this .
        ///    
        /// 
        public Matrix Transform 
        {
            get { return _GetTransform();} 
            set { _SetTransform(value);} 
        }
 
        /// 
        /// 
        ///    Resets the  property to identity.
        ///  
        public void ResetTransform() {
            int status = SafeNativeMethods.Gdip.GdipResetLineTransform(new HandleRef(this, this.NativeBrush)); 
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }

        /// 
        ///  
        ///    
        ///       Multiplies the  that represents the local geometrical 
        ///       transform of this  by the specified  by prepending the specified . 
        ///    
        ///  
        public void MultiplyTransform(Matrix matrix)
        {
            MultiplyTransform(matrix, MatrixOrder.Prepend);
        } 

        ///  
        ///  
        ///    
        ///       Multiplies the  that represents the local geometrical 
        ///       transform of this  by the specified  in the specified order.
        ///    
        /// 
        public void MultiplyTransform(Matrix matrix, MatrixOrder order) 
        {
            if (matrix == null) { 
                throw new ArgumentNullException("matrix"); 
            }
 
            int status = SafeNativeMethods.Gdip.GdipMultiplyLineTransform(new HandleRef(this, this.NativeBrush),
                                                new HandleRef(matrix, matrix.nativeMatrix),
                                                order);
 
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        } 

 
        /// 
        /// 
        ///    Translates the local geometrical transform
        ///    by the specified dimmensions. This method prepends the translation to the 
        ///    transform.
        ///  
        public void TranslateTransform(float dx, float dy) 
        { TranslateTransform(dx, dy, MatrixOrder.Prepend); }
 
        /// 
        /// 
        ///    Translates the local geometrical transform
        ///    by the specified dimmensions in the specified order. 
        /// 
        public void TranslateTransform(float dx, float dy, MatrixOrder order) 
        { 
            int status = SafeNativeMethods.Gdip.GdipTranslateLineTransform(new HandleRef(this, this.NativeBrush),
                                                            dx, 
                                                            dy,
                                                            order);
            if (status != SafeNativeMethods.Gdip.Ok)
                throw SafeNativeMethods.Gdip.StatusException(status); 
        }
 
        ///  
        /// 
        ///    Scales the local geometric transform by the 
        ///    specified amounts. This method prepends the scaling matrix to the transform.
        /// 
        public void ScaleTransform(float sx, float sy)
        { ScaleTransform(sx, sy, MatrixOrder.Prepend); } 

        ///  
        ///  
        ///    
        ///       Scales the local geometric transform by the 
        ///       specified amounts in the specified order.
        ///    
        /// 
        public void ScaleTransform(float sx, float sy, MatrixOrder order) 
        {
            int status = SafeNativeMethods.Gdip.GdipScaleLineTransform(new HandleRef(this, this.NativeBrush), 
                                                        sx, 
                                                        sy,
                                                        order); 

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

        ///  
        ///  
        ///    Rotates the local geometric transform by the
        ///    specified amount. This method prepends the rotation to the transform. 
        /// 
        public void RotateTransform(float angle)
        { RotateTransform(angle, MatrixOrder.Prepend); }
 
        /// 
        ///  
        ///     
        ///       Rotates the local geometric transform by the specified
        ///       amount in the specified order. 
        ///    
        /// 
        public void RotateTransform(float angle, MatrixOrder order)
        { 
            int status = SafeNativeMethods.Gdip.GdipRotateLineTransform(new HandleRef(this, this.NativeBrush),
                                                         angle, 
                                                         order); 

            if (status != SafeNativeMethods.Gdip.Ok) 
                throw SafeNativeMethods.Gdip.StatusException(status);
        }
    }
 
}
 
// File provided for Reference Use Only by Microsoft Corporation (c) 2007. 
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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