LinearGradientBrush.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / LinearGradientBrush.cs / 1305600 / LinearGradientBrush.cs
                        
                        
                            //---------------------------------------------------------------------------- 
//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
// Description: This file contains the implementation of LinearGradientBrush. 
//              The LinearGradientBrush is a GradientBrush which defines its
//              Gradient as a linear interpolation between two parallel lines. 
// 
// History:
//  05/07/2003 : [....] - Created it. 
//  09/21/2004 : timothyc - Added GradientStopCollection constructors.
//
//---------------------------------------------------------------------------
 
using MS.Internal;
using MS.Internal.PresentationCore; 
using System; 
using System.ComponentModel;
using System.ComponentModel.Design.Serialization; 
using System.Diagnostics;
using System.Reflection;
using System.Windows;
using System.Windows.Media; 
using System.Windows.Media.Animation;
using System.Runtime.InteropServices; 
using System.Windows.Media.Composition; 
using System.Security;
using System.Security.Permissions; 
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;

namespace System.Windows.Media 
{
    ///  
    /// LinearGradientBrush - This GradientBrush defines its Gradient as an interpolation 
    /// between two parallel lines.
    ///  
    public sealed partial class LinearGradientBrush : GradientBrush
    {
        #region Constructors
 
        /// 
        /// Default constructor for LinearGradientBrush.  The resulting brush has no content. 
        ///  
        public LinearGradientBrush() : base()
        { 
        }

        /// 
        /// LinearGradientBrush Constructor 
        /// Constructs a LinearGradientBrush with GradientStops specified at offset 0.0 and
        /// 1.0. The StartPoint is set to (0,0) and the EndPoint is derived from the angle 
        /// such that 1) the line containing the StartPoint and EndPoint is 'angle' degrees 
        /// from the horizontal in the direction of positive Y, and 2) the EndPoint lies on
        ///  the perimeter of the unit circle. 
        /// 
        ///  The Color at offset 0.0. 
        ///  The Color at offset 1.0. 
        ///  The angle, in degrees, that the gradient will be away from horizontal.  
        public LinearGradientBrush(Color startColor,
                                   Color endColor, 
                                   double angle) : base() 
        {
            EndPoint = EndPointFromAngle(angle); 

            GradientStops.Add(new GradientStop(startColor, 0.0));
            GradientStops.Add(new GradientStop(endColor, 1.0));
        } 

        ///  
        /// LinearGradientBrush Constructor 
        /// Constructs a LinearGradientBrush with two colors at the specified start and end points.
        ///  
        ///  The Color at offset 0.0. 
        ///  The Color at offset 1.0. 
        ///  The start point
        ///  The end point 
        public LinearGradientBrush(Color startColor,
                                   Color endColor, 
                                   Point startPoint, 
                                   Point endPoint) : base()
        { 
            StartPoint = startPoint;
            EndPoint = endPoint;

            GradientStops.Add(new GradientStop(startColor, 0.0)); 
            GradientStops.Add(new GradientStop(endColor, 1.0));
        } 
 
        /// 
        /// LinearGradientBrush Constructor 
        /// Constructs a LinearGradientBrush with GradientStops set to the passed-in collection.
        /// 
        ///  GradientStopCollection to set on this brush. 
        public LinearGradientBrush(GradientStopCollection gradientStopCollection) 
                                                : base (gradientStopCollection)
        { 
        } 

        ///  
        /// LinearGradientBrush Constructor
        /// Constructs a LinearGradientBrush with GradientStops set to the passed-in collection.
        /// Constructs a LinearGradientBrush with GradientStops specified at offset 0.0 and
        /// 1.0. The StartPoint is set to (0,0) and the EndPoint is derived from the angle 
        /// such that 1) the line containing the StartPoint and EndPoint is 'angle' degrees
        /// from the horizontal in the direction of positive Y, and 2) the EndPoint lies on 
        ///  the perimeter of the unit circle. 
        /// 
        ///  GradientStopCollection to set on this brush.  
        ///  The angle, in degrees, that the gradient will be away from horizontal. 
        public LinearGradientBrush(GradientStopCollection gradientStopCollection,
                                   double angle) : base (gradientStopCollection)
        { 
            EndPoint = EndPointFromAngle(angle);
        } 
 
        /// 
        /// LinearGradientBrush Constructor 
        /// Constructs a LinearGradientBrush with GradientStops set to the passed-in collection.
        /// The StartPoint and EndPoint are set to the specified startPoint and endPoint.
        /// 
        ///  GradientStopCollection to set on this brush.  
        ///  The start point
        ///  The end point 
        public LinearGradientBrush(GradientStopCollection gradientStopCollection, 
                                   Point startPoint,
                                   Point endPoint) : base (gradientStopCollection) 
        {
            StartPoint = startPoint;
            EndPoint = endPoint;
        } 

 
        #endregion Constructors 

        ///  
        ///     Critical: This code accesses unsafe code blocks
        ///     TreatAsSafe: This code does is safe to call but needs to be verified for correctness
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        private void ManualUpdateResource(DUCE.Channel channel, bool skipOnChannelCheck)
        { 
            // If we're told we can skip the channel check, then we must be on channel 
            Debug.Assert(!skipOnChannelCheck || _duceResource.IsOnChannel(channel));
 
            if (skipOnChannelCheck || _duceResource.IsOnChannel(channel))
            {
                Transform vTransform = Transform;
                Transform vRelativeTransform = RelativeTransform; 
                GradientStopCollection vGradientStops = GradientStops;
 
                DUCE.ResourceHandle hTransform; 
                if (vTransform == null ||
                    Object.ReferenceEquals(vTransform, Transform.Identity) 
                    )
                {
                    hTransform = DUCE.ResourceHandle.Null;
                } 
                else
                { 
                    hTransform = ((DUCE.IResource)vTransform).GetHandle(channel); 
                }
                DUCE.ResourceHandle hRelativeTransform; 
                if (vRelativeTransform == null ||
                    Object.ReferenceEquals(vRelativeTransform, Transform.Identity)
                    )
                { 
                    hRelativeTransform = DUCE.ResourceHandle.Null;
                } 
                else 
                {
                    hRelativeTransform = ((DUCE.IResource)vRelativeTransform).GetHandle(channel); 
                }
                DUCE.ResourceHandle hOpacityAnimations = GetAnimationResourceHandle(OpacityProperty, channel);
                DUCE.ResourceHandle hStartPointAnimations = GetAnimationResourceHandle(StartPointProperty, channel);
                DUCE.ResourceHandle hEndPointAnimations = GetAnimationResourceHandle(EndPointProperty, channel); 

                unsafe 
                { 
                    DUCE.MILCMD_LINEARGRADIENTBRUSH data;
                    data.Type = MILCMD.MilCmdLinearGradientBrush; 
                    data.Handle = _duceResource.GetHandle(channel);
                    double tempOpacity = Opacity;
                    DUCE.CopyBytes((byte*)&data.Opacity, (byte*)&tempOpacity, 8);
                    data.hOpacityAnimations = hOpacityAnimations; 
                    data.hTransform = hTransform;
                    data.hRelativeTransform = hRelativeTransform; 
                    data.ColorInterpolationMode = ColorInterpolationMode; 
                    data.MappingMode = MappingMode;
                    data.SpreadMethod = SpreadMethod; 

                    Point tempStartPoint = StartPoint;
                    DUCE.CopyBytes((byte*)&data.StartPoint, (byte*)&tempStartPoint, 16);
                    data.hStartPointAnimations = hStartPointAnimations; 
                    Point tempEndPoint = EndPoint;
                    DUCE.CopyBytes((byte*)&data.EndPoint, (byte*)&tempEndPoint, 16); 
                    data.hEndPointAnimations = hEndPointAnimations; 

                    // NTRAID#Longhorn-1011154-2004/8/12-asecchia GradientStopCollection:  Need to enforce upper-limit of gradient stop capacity 

                    int count = (vGradientStops == null) ? 0 : vGradientStops.Count;
                    data.GradientStopsSize = (UInt32)(sizeof(DUCE.MIL_GRADIENTSTOP)*count);
 
                    channel.BeginCommand(
                        (byte*)&data, 
                        sizeof(DUCE.MILCMD_LINEARGRADIENTBRUSH), 
                        sizeof(DUCE.MIL_GRADIENTSTOP)*count
                        ); 

                    for (int i=0; i 
    /// LinearGradientBrush - This GradientBrush defines its Gradient as an interpolation 
    /// between two parallel lines.
    ///  
    public sealed partial class LinearGradientBrush : GradientBrush
    {
        #region Constructors
 
        /// 
        /// Default constructor for LinearGradientBrush.  The resulting brush has no content. 
        ///  
        public LinearGradientBrush() : base()
        { 
        }

        /// 
        /// LinearGradientBrush Constructor 
        /// Constructs a LinearGradientBrush with GradientStops specified at offset 0.0 and
        /// 1.0. The StartPoint is set to (0,0) and the EndPoint is derived from the angle 
        /// such that 1) the line containing the StartPoint and EndPoint is 'angle' degrees 
        /// from the horizontal in the direction of positive Y, and 2) the EndPoint lies on
        ///  the perimeter of the unit circle. 
        /// 
        ///  The Color at offset 0.0. 
        ///  The Color at offset 1.0. 
        ///  The angle, in degrees, that the gradient will be away from horizontal.  
        public LinearGradientBrush(Color startColor,
                                   Color endColor, 
                                   double angle) : base() 
        {
            EndPoint = EndPointFromAngle(angle); 

            GradientStops.Add(new GradientStop(startColor, 0.0));
            GradientStops.Add(new GradientStop(endColor, 1.0));
        } 

        ///  
        /// LinearGradientBrush Constructor 
        /// Constructs a LinearGradientBrush with two colors at the specified start and end points.
        ///  
        ///  The Color at offset 0.0. 
        ///  The Color at offset 1.0. 
        ///  The start point
        ///  The end point 
        public LinearGradientBrush(Color startColor,
                                   Color endColor, 
                                   Point startPoint, 
                                   Point endPoint) : base()
        { 
            StartPoint = startPoint;
            EndPoint = endPoint;

            GradientStops.Add(new GradientStop(startColor, 0.0)); 
            GradientStops.Add(new GradientStop(endColor, 1.0));
        } 
 
        /// 
        /// LinearGradientBrush Constructor 
        /// Constructs a LinearGradientBrush with GradientStops set to the passed-in collection.
        /// 
        ///  GradientStopCollection to set on this brush. 
        public LinearGradientBrush(GradientStopCollection gradientStopCollection) 
                                                : base (gradientStopCollection)
        { 
        } 

        ///  
        /// LinearGradientBrush Constructor
        /// Constructs a LinearGradientBrush with GradientStops set to the passed-in collection.
        /// Constructs a LinearGradientBrush with GradientStops specified at offset 0.0 and
        /// 1.0. The StartPoint is set to (0,0) and the EndPoint is derived from the angle 
        /// such that 1) the line containing the StartPoint and EndPoint is 'angle' degrees
        /// from the horizontal in the direction of positive Y, and 2) the EndPoint lies on 
        ///  the perimeter of the unit circle. 
        /// 
        ///  GradientStopCollection to set on this brush.  
        ///  The angle, in degrees, that the gradient will be away from horizontal. 
        public LinearGradientBrush(GradientStopCollection gradientStopCollection,
                                   double angle) : base (gradientStopCollection)
        { 
            EndPoint = EndPointFromAngle(angle);
        } 
 
        /// 
        /// LinearGradientBrush Constructor 
        /// Constructs a LinearGradientBrush with GradientStops set to the passed-in collection.
        /// The StartPoint and EndPoint are set to the specified startPoint and endPoint.
        /// 
        ///  GradientStopCollection to set on this brush.  
        ///  The start point
        ///  The end point 
        public LinearGradientBrush(GradientStopCollection gradientStopCollection, 
                                   Point startPoint,
                                   Point endPoint) : base (gradientStopCollection) 
        {
            StartPoint = startPoint;
            EndPoint = endPoint;
        } 

 
        #endregion Constructors 

        ///  
        ///     Critical: This code accesses unsafe code blocks
        ///     TreatAsSafe: This code does is safe to call but needs to be verified for correctness
        /// 
        [SecurityCritical, SecurityTreatAsSafe] 
        private void ManualUpdateResource(DUCE.Channel channel, bool skipOnChannelCheck)
        { 
            // If we're told we can skip the channel check, then we must be on channel 
            Debug.Assert(!skipOnChannelCheck || _duceResource.IsOnChannel(channel));
 
            if (skipOnChannelCheck || _duceResource.IsOnChannel(channel))
            {
                Transform vTransform = Transform;
                Transform vRelativeTransform = RelativeTransform; 
                GradientStopCollection vGradientStops = GradientStops;
 
                DUCE.ResourceHandle hTransform; 
                if (vTransform == null ||
                    Object.ReferenceEquals(vTransform, Transform.Identity) 
                    )
                {
                    hTransform = DUCE.ResourceHandle.Null;
                } 
                else
                { 
                    hTransform = ((DUCE.IResource)vTransform).GetHandle(channel); 
                }
                DUCE.ResourceHandle hRelativeTransform; 
                if (vRelativeTransform == null ||
                    Object.ReferenceEquals(vRelativeTransform, Transform.Identity)
                    )
                { 
                    hRelativeTransform = DUCE.ResourceHandle.Null;
                } 
                else 
                {
                    hRelativeTransform = ((DUCE.IResource)vRelativeTransform).GetHandle(channel); 
                }
                DUCE.ResourceHandle hOpacityAnimations = GetAnimationResourceHandle(OpacityProperty, channel);
                DUCE.ResourceHandle hStartPointAnimations = GetAnimationResourceHandle(StartPointProperty, channel);
                DUCE.ResourceHandle hEndPointAnimations = GetAnimationResourceHandle(EndPointProperty, channel); 

                unsafe 
                { 
                    DUCE.MILCMD_LINEARGRADIENTBRUSH data;
                    data.Type = MILCMD.MilCmdLinearGradientBrush; 
                    data.Handle = _duceResource.GetHandle(channel);
                    double tempOpacity = Opacity;
                    DUCE.CopyBytes((byte*)&data.Opacity, (byte*)&tempOpacity, 8);
                    data.hOpacityAnimations = hOpacityAnimations; 
                    data.hTransform = hTransform;
                    data.hRelativeTransform = hRelativeTransform; 
                    data.ColorInterpolationMode = ColorInterpolationMode; 
                    data.MappingMode = MappingMode;
                    data.SpreadMethod = SpreadMethod; 

                    Point tempStartPoint = StartPoint;
                    DUCE.CopyBytes((byte*)&data.StartPoint, (byte*)&tempStartPoint, 16);
                    data.hStartPointAnimations = hStartPointAnimations; 
                    Point tempEndPoint = EndPoint;
                    DUCE.CopyBytes((byte*)&data.EndPoint, (byte*)&tempEndPoint, 16); 
                    data.hEndPointAnimations = hEndPointAnimations; 

                    // NTRAID#Longhorn-1011154-2004/8/12-asecchia GradientStopCollection:  Need to enforce upper-limit of gradient stop capacity 

                    int count = (vGradientStops == null) ? 0 : vGradientStops.Count;
                    data.GradientStopsSize = (UInt32)(sizeof(DUCE.MIL_GRADIENTSTOP)*count);
 
                    channel.BeginCommand(
                        (byte*)&data, 
                        sizeof(DUCE.MILCMD_LINEARGRADIENTBRUSH), 
                        sizeof(DUCE.MIL_GRADIENTSTOP)*count
                        ); 

                    for (int i=0; i
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