protected virtual void DoSaveChart(string sheetName, string fileName, SaveChartOptions options)
{
options ??= new SaveChartOptions();
var spread = options.Spreadsheet?.Workbook ?? Workbook;
ChartObject chart = null;
Image chartImage;
var chartSheet = spread.ChartSheets[sheetName];
if (chartSheet != null)
{
chart = chartSheet.Chart;
}
if (chart == null)
{
var worksheet = spread.Worksheets[sheetName];
if (worksheet != null && worksheet.Charts.Count > Math.Max(0, options.ChartIndex ?? 0))
{
chart = worksheet.Charts[options.ChartIndex ?? 0];
}
}
if (chart == null)
{
throw new Exception("Cannot find chart.");
}
if (options.Size != null && options.Size.Length != 2)
{
throw new Exception("Invalid size of the image. Must be 2-elements integer array.");
}
if (options.Size != null)
{
var imageSize = new Size(options.Size[0], options.Size[1]);
chartImage = chart.GetImage(imageSize).NativeImage;
}
else
{
chartImage = chart.GetImage().NativeImage;
}
if (string.IsNullOrWhiteSpace(fileName))
{
throw new Exception("Filename for image is not specified.");
}
fileName = Project.Current.MapPath(fileName);
var dir = Path.GetDirectoryName(fileName);
if (!Directory.Exists(dir))
{
throw new Exception($"Directory '{dir}' does not exist.");
}
if (File.Exists(fileName))
{
if (options.Replace)
{
File.Delete(fileName);
}
else
{
throw new Exception($"File '{fileName}' already exists.");
}
}
System.Drawing.Imaging.ImageFormat format = (options.Format ?? GetImageFormatFromFileName(fileName)) switch
{
ImageFileFormat.Png => System.Drawing.Imaging.ImageFormat.Png,
ImageFileFormat.Tiff => System.Drawing.Imaging.ImageFormat.Tiff,
ImageFileFormat.Bmp => System.Drawing.Imaging.ImageFormat.Bmp,
ImageFileFormat.Gif => System.Drawing.Imaging.ImageFormat.Gif,
ImageFileFormat.Jpeg => System.Drawing.Imaging.ImageFormat.Jpeg,
_ => System.Drawing.Imaging.ImageFormat.Png
};
chartImage.Save(fileName, format);
if (options.CopyToBook)
{
CopyImageToBook(chartImage, options.CopyToBookScale, options.CopyToBookScale, options);
}
}
}