/// <summary>
        /// Add a background picture to the currently selected worksheet given a picture's data in a byte array.
        /// If there's an existing background picture, that will be deleted first.
        /// </summary>
        /// <param name="PictureByteData">The picture's data in a byte array.</param>
        /// <param name="PictureType">The image type of the picture.</param>
        public void AddBackgroundPicture(byte[] PictureByteData, ImagePartType PictureType)
        {
            // delete any background picture first
            this.DeleteBackgroundPicture();

            slws.BackgroundPictureDataIsInFile = false;
            slws.BackgroundPictureByteData = new byte[PictureByteData.Length];
            for (int i = 0; i < PictureByteData.Length; ++i)
            {
                slws.BackgroundPictureByteData[i] = PictureByteData[i];
            }
            slws.BackgroundPictureImagePartType = PictureType;
        }

 /// <summary>
 /// Adds a ImagePart to the WorksheetPart.
 /// </summary>
 /// <param name="partType">The part type of the ImagePart.</param>
 /// <param name="id">The relationship id.</param>
 /// <returns>The newly added part.</returns>
  public ImagePart AddImagePart(ImagePartType partType, string id)
 {
     string contentType = ImagePartTypeInfo.GetContentType(partType);
     string partExtension = ImagePartTypeInfo.GetTargetExtension(partType);
     OpenXmlPackage.PartExtensionProvider.MakeSurePartExtensionExist(contentType, partExtension);
 
     return AddImagePart(contentType, id);
 }

    private static byte[] GetImageData(string imageFilePath, ref ImagePartType imagePartType, ref long imageWidthEMU, ref long imageHeightEMU)
    {
        byte[] imageFileBytes;

        // Open a stream on the image file and read it's contents. The
        // following code will generate an exception if an invalid file
        // name is passed.
        using (FileStream fsImageFile = File.OpenRead(imageFilePath))
        {
            imageFileBytes = new byte[fsImageFile.Length];
            fsImageFile.Read(imageFileBytes, 0, imageFileBytes.Length);

            Bitmap imageFile = new Bitmap(fsImageFile);

                // Determine the format of the image file.
                // This sample code supports working with the following types of image files:
                //
                // Bitmap (BMP)
                // Graphics Interchange Format (GIF)
                // Joint Photographic Experts Group (JPG, JPEG)
                // Portable Network Graphics (PNG)
                // Tagged Image File Format (TIFF)

                if (imageFile.RawFormat.Guid == ImageFormat.Bmp.Guid)
                    imagePartType = ImagePartType.Bmp;
                else if (imageFile.RawFormat.Guid == ImageFormat.Gif.Guid)
                    imagePartType = ImagePartType.Gif;
                else if (imageFile.RawFormat.Guid == ImageFormat.Jpeg.Guid)
                    imagePartType = ImagePartType.Jpeg;
                else if (imageFile.RawFormat.Guid == ImageFormat.Png.Guid)
                    imagePartType = ImagePartType.Png;
                else if (imageFile.RawFormat.Guid == ImageFormat.Tiff.Guid)
                    imagePartType = ImagePartType.Tiff;
                else
                {
                    throw new ArgumentException("Unsupported image file format: " + imageFilePath);
                }

                if (imageFile.Width > 1024)
                {

                   Size size = new Size(1024, (imageFile.Height * imageFile.Width) / 1024);
                   imageFile = Utils.ResizeImage(imageFile,size);
                }
                if (imageFile.Height > 768)
                {
                    Size size = new Size((imageFile.Height * imageFile.Width) / 768, 768);
                    imageFile = Utils.ResizeImage(imageFile, size);
                }

                // Get the dimensions of the image in English Metric Units (EMU)
                // for use when adding the markup for the image to the slide.
                imageWidthEMU =
                    (long)((imageFile.Width / imageFile.HorizontalResolution) * 914400L);
                imageHeightEMU =
                    (long)((imageFile.Height / imageFile.VerticalResolution) * 914400L);

        }

        return imageFileBytes;
    }

        /// <summary>
        /// Initializes an instance of SLPicture given a picture's data in a byte array, and the targeted computer's horizontal and vertical resolution. This scales the picture according to how it will be displayed on the targeted computer screen.
        /// </summary>
        /// <param name="PictureByteData">The picture's data in a byte array.</param>
        /// <param name="PictureType">The image type of the picture.</param>
        /// <param name="TargetHorizontalResolution">The targeted computer's horizontal resolution (DPI).</param>
        /// <param name="TargetVerticalResolution">The targeted computer's vertical resolution (DPI).</param>
        public SLPicture(byte[] PictureByteData, ImagePartType PictureType, float TargetHorizontalResolution, float TargetVerticalResolution)
        {
            InitialisePicture();

            DataIsInFile = false;
            this.PictureByteData = new byte[PictureByteData.Length];
            for (int i = 0; i < PictureByteData.Length; ++i)
            {
                this.PictureByteData[i] = PictureByteData[i];
            }
            this.PictureImagePartType = PictureType;

            SetResolution(true, TargetHorizontalResolution, TargetVerticalResolution);
        }

        private void InitialisePictureFile(string FileName)
        {
            this.PictureFileName = FileName.Trim();

            this.PictureImagePartType = SLDrawingTool.GetImagePartType(this.PictureFileName);

            string sImageFileName = this.PictureFileName.Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar);
            sImageFileName = sImageFileName.Substring(sImageFileName.LastIndexOf(Path.DirectorySeparatorChar) + 1);
            this.sAlternativeText = sImageFileName;
        }

        private void InitialisePicture()
        {
            // should be true once we get *everyone* to stop using those confoundedly
            // hard to understand EMUs and absolute positionings...
            UseEasyPositioning = false;
            TopPosition = 0;
            LeftPosition = 0;

            UseRelativePositioning = true;
            AnchorRowIndex = 1;
            AnchorColumnIndex = 1;
            OffsetX = 0;
            OffsetY = 0;
            WidthInEMU = 0;
            HeightInEMU = 0;
            WidthInPixels = 0;
            HeightInPixels = 0;
            fHorizontalResolutionRatio = 1;
            fVerticalResolutionRatio = 1;

            this.bLockWithSheet = true;
            this.bPrintWithSheet = true;
            this.vCompressionState = A.BlipCompressionValues.Print;
            this.decBrightness = 0;
            this.decContrast = 0;
            //this.decRotationAngle = 0;

            this.ShapeProperties = new SLShapeProperties(new List<System.Drawing.Color>());

            this.HasUri = false;
            this.HyperlinkUri = string.Empty;
            this.HyperlinkUriKind = UriKind.Absolute;
            this.IsHyperlinkExternal = true;

            this.DataIsInFile = true;
            this.PictureFileName = string.Empty;
            this.PictureByteData = new byte[1];
            this.PictureImagePartType = ImagePartType.Bmp;
        }

        internal static string GetContentType(ImagePartType imageType)
        {
            switch (imageType)
            {
                case ImagePartType.Bmp:
                    return "image/bmp";

                case ImagePartType.Gif:
                    return "image/gif";

                case ImagePartType.Png:
                    return "image/png";

                case ImagePartType.Tiff:
                    return "image/tiff";

                //case ImagePartType.Xbm:
                //    return "image/xbm";

                case ImagePartType.Icon:
                    return "image/x-icon";

                case ImagePartType.Pcx:
                    return "image/x-pcx";

                //case ImagePartType.Pcz:
                //    return "image/x-pcz";

                //case ImagePartType.Pict:
                //    return "image/pict";

                case ImagePartType.Jpeg:
                    return "image/jpeg";

                case ImagePartType.Emf:
                    return "image/x-emf";

                case ImagePartType.Wmf:
                    return "image/x-wmf";

                default:
                    throw new ArgumentOutOfRangeException("imageType");
            }
        }

        internal static string GetTargetExtension(ImagePartType imageType)
        {
            switch (imageType)
            {
                case ImagePartType.Bmp:
                    return ".bmp";

                case ImagePartType.Gif:
                    return ".gif";

                case ImagePartType.Png:
                    return ".png";

                case ImagePartType.Tiff:
                    return ".tiff";

                //case ImagePartType.Xbm:
                //    return ".xbm";

                case ImagePartType.Icon:
                    return ".ico";

                case ImagePartType.Pcx:
                    return ".pcx";

                //case ImagePartType.Pcz:
                //    return ".pcz";

                //case ImagePartType.Pict:
                //    return ".pict";

                case ImagePartType.Jpeg:
                    return ".jpg";

                case ImagePartType.Emf:
                    return ".emf";

                case ImagePartType.Wmf:
                    return ".wmf";

                default:
                    return ".image";
            }
        }

//.........这里部分代码省略.........
            //this.decRotationAngle = 0;

            this.vPictureShape = A.ShapeTypeValues.Rectangle;

            this.FillType = SLPictureFillType.None;
            this.FillClassInnerXml = string.Empty;

            this.HasOutline = false;
            this.PictureOutline = new A.Outline();
            this.HasOutlineFill = false;
            this.PictureOutlineFill = new A.SolidFill();

            this.HasGlow = false;
            this.GlowRadius = 0;
            this.GlowColorInnerXml = string.Empty;

            this.HasInnerShadow = false;
            this.PictureInnerShadow = new A.InnerShadow();
            this.HasOuterShadow = false;
            this.PictureOuterShadow = new A.OuterShadow();

            this.HasReflection = false;
            this.ReflectionBlurRadius = 0;
            this.ReflectionStartOpacity = 100000;
            this.ReflectionStartPosition = 0;
            this.ReflectionEndAlpha = 0;
            this.ReflectionEndPosition = 100000;
            this.ReflectionDistance = 0;
            this.ReflectionDirection = 0;
            this.ReflectionFadeDirection = 5400000;
            this.ReflectionHorizontalRatio = 100000;
            this.ReflectionVerticalRatio = 100000;
            this.ReflectionHorizontalSkew = 0;
            this.ReflectionVerticalSkew = 0;
            this.ReflectionAlignment = A.RectangleAlignmentValues.Bottom;
            this.ReflectionRotateWithShape = true;

            this.HasSoftEdge = false;
            this.SoftEdgeRadius = 0;

            this.HasScene3D = false;

            this.CameraLatitude = 0;
            this.CameraLongitude = 0;
            this.CameraRevolution = 0;
            this.CameraPreset = A.PresetCameraValues.OrthographicFront;
            this.CameraFieldOfView = 0;
            this.CameraZoom = 0;

            this.LightRigLatitude = 0;
            this.LightRigLongitude = 0;
            this.LightRigRevolution = 0;
            this.LightRigType = A.LightRigValues.ThreePoints;
            this.LightRigDirection = A.LightRigDirectionValues.Top;

            //this.HasBackdrop = false;
            //this.BackdropAnchorX = 0;
            //this.BackdropAnchorY = 0;
            //this.BackdropAnchorZ = 0;
            //this.BackdropNormalDx = 0;
            //this.BackdropNormalDy = 0;
            //this.BackdropNormalDz = 0;
            //this.BackdropUpVectorDx = 0;
            //this.BackdropUpVectorDy = 0;
            //this.BackdropUpVectorDz = 0;

            this.HasBevelTop = false;
            this.BevelTopPreset = A.BevelPresetValues.Circle;
            this.BevelTopWidth = 76200;
            this.BevelTopHeight = 76200;

            this.HasBevelBottom = false;
            this.BevelBottomPreset = A.BevelPresetValues.Circle;
            this.BevelBottomWidth = 76200;
            this.BevelBottomHeight = 76200;

            this.HasExtrusion = false;
            this.ExtrusionHeight = 0;
            this.ExtrusionColorInnerXml = string.Empty;

            this.HasContour = false;
            this.ContourWidth = 0;
            this.ContourColorInnerXml = string.Empty;

            this.HasMaterialType = false;
            this.MaterialType = A.PresetMaterialTypeValues.WarmMatte;

            this.HasZDistance = false;
            this.ZDistance = 0;

            this.HasUri = false;
            this.HyperlinkUri = string.Empty;
            this.HyperlinkUriKind = UriKind.Absolute;
            this.IsHyperlinkExternal = true;

            this.DataIsInFile = true;
            this.PictureFileName = string.Empty;
            this.PictureByteData = new byte[1];
            this.PictureImagePartType = ImagePartType.Bmp;
        }