打印缩放到适合页面的XpsDocument

Question

我们在应用程序中使用了Telerik的WPF图表控件。图表控件具有将图形导出到XPS文件的内置支持。我想利用WPF对打印XPS文档的支持来打印图表。在大多数情况下，这很有效，但我在将图表缩放到一个页面上时遇到了困难。图表图形总是在右侧和底部被截断。图表对于页面来说太大了。有什么想法吗？

下面是我使用的代码：

const string packageUriString = "pack://inMemoryChart.xps";

using (var memoryStream = new MemoryStream())
{
    //utilize Telerik ChartView method to export to XPS... 
    _chart.ExportToXps(memoryStream);

    using (var package = Package.Open(memoryStream))
    {
        var packageUri = new Uri(packageUriString);

        PackageStore.AddPackage(packageUri, package);

        var xpsDocument = new XpsDocument(package, CompressionOption.Maximum, packageUriString);

        var printDialog = new PrintDialog();
        var result = printDialog.ShowDialog();

        if (!result.GetValueOrDefault())
            return;

        var fixedDocumentSequence = xpsDocument.GetFixedDocumentSequence();

        if (fixedDocumentSequence == null)
            return;

        var documentPaginator = fixedDocumentSequence.DocumentPaginator;

        if (documentPaginator == null)
            return;

        //attempt to adjust to fit page?
        AdjustFlowDocumentToPage(documentPaginator, printDialog.PrintQueue); 

        printDialog.PrintDocument(documentPaginator , "Chart");

        PackageStore.RemovePackage(packageUri);
    }
}

我在另一台site上找到了AdjustFlowDocumentToPage

public static void AdjustFlowDocumentToPage(DocumentPaginator documentPaginator, PrintQueue printQueue)
{
   const double inch = 96;

   var printTicket = printQueue.UserPrintTicket;

   // Get the media size.
   double width = printTicket.PageMediaSize.Width.Value;
   double height = printTicket.PageMediaSize.Height.Value;

   // Set the margins.
   const double leftmargin = 1.25 * inch;
   const double rightmargin = 1.25 * inch;
   const double topmargin = 1 * inch;
   const double bottommargin = 1 * inch;

   // Calculate the content size.
   var contentwidth = width - leftmargin - rightmargin;
   var contentheight = height - topmargin - bottommargin;

   documentPaginator.PageSize = new Size(contentwidth, contentheight);
}

Answer 1

经过进一步的研究，我发现了下面的实现，它似乎工作得很好！http://www.telerik.com/community/forums/wpf/chart/behaviour-based-chart-print-solution.aspx