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V25.1
  • TdxChartControlReportLink Class

    A report link that associates a Chart control with a TdxComponentPrinter component.

    Declaration

    TdxChartControlReportLink = class(
        TdxCustomChartControlReportLink
    )

    Remarks

    The TdxChartControlReportLink class implements the functionality required to print diagrams displayed in a Chart control.

    VCL Printing System: A Chart Control Print Preview Example

    To be able to print a Chart control or export its content to a PDF document, you need to create a report link to associate the control with a TdxComponentPrinter component in your application.

    Main API Members

    The list below outlines key members of the TdxChartControlReportLink class. These members allow you to define how the Chart control is printed and exported to PDF.

    Component Settings

    Caption | Description
    Specify caption and description for the report link.
    IsCurrentLink
    Allows you to identify if the report link is active.

    Page Settings and Preview

    PageSetup | PageSetupEx
    Display the Page Setup dialog.
    PreviewExists
    Identifies whether the Print Preview dialog is visible.
    Preview
    Displays the Print Preview dialog.
    PrinterPage
    Provides access to printer page settings.
    ShowPageHeader | ShowPageFooter
    Specify if page headers and footers are visible.
    ReportTitle | ReportTitleMode | ReportTitleText
    Allow you to add a custom title to printed pages.
    PDFExportOptions | ExportToPDF
    Allow you to configure PDF export settings and export Chart content to a PDF document.
    Print | PrintEx | PrintPages | PrintPagesEx
    Print the associated Chart control.

    To create a report link for a Chart control at design time, add a TdxComponentPrinter component to a form. Double-click the component to open the Report Links editor dialog.

    VCL Printing System: An Empty Report Links Editor

    This dialog allows you to manage all report links in your application. Click the Add… button to open the Add Link dialog.

    VCL Printing System: The Add Link Dialog

    The Available Source(s) box lists all controls for which you can create a report link. Select the target Chart control and click the OK button to create a report link (a TdxChartControlReportLink class instance) for the control in the TdxComponentPrinter component.

    VCL Printing System: The Report Links Editor with a Chart Control Report Link

    Close the Report Links dialog. Now you can use report link and component printer APIs to print Chart control content and display the Print Preview dialog for the control.

    To delete an existing report link at design time, double-click the TdxComponentPrinter component to open the Report Links editor dialog. Select the required report link in the Available Source(s) box and click the Delete button.

    You can manage report links in a component printer, configure print settings, and execute any print and export operations in code.

    The following code example creates a report link for an existing Chart control, customizes report link settings, exports control content to a PDF document file, and deletes the created report link:

    uses
      dxPSdxChartControlLnk;  // Declares the TdxChartControlReportLink class
    // ...
    var
      AReportLink: TBasedxReportLink;
    begin
      // Creates a Chart control report link
      AReportLink := dxComponentPrinter1.AddEmptyLinkEx(TdxChartControlReportLink, dxChartControl1);
      AReportLink.Component := dxChartControl1;  // Associates the created report link with the source control
      try
        AReportLink.PDFExportOptions.JPEGQuality := 80;  // Adjusts the JPEG compression rate for export
        AReportLink.PDFExportOptions.OpenDocumentAfterExport := True; // Opens the resulting document after export
        AReportLink.ExportToPDF;  // Displays "PDF Export Options" and "Save As" dialogs
      finally
        dxComponentPrinter1.DeleteLink(AReportLink.Index); // Deletes the report link after export
      end;
    end;
    

    VCL Printing System: A PDF Document with Exported Chart Content

    To see the Chart print functionality in action, run the Chart Control demo in the VCL Demo Center installed with compiled DevExpress demos. Click the Print or Print Preview button to display the corresponding dialog.

    Download: Compiled VCL Demos

    Tip

    Compiled DevExpress demos ship with source code installed in the Public Documents folder (%Public%) for all users (default). You can find all project and source code files for the Chart control demo in the following folder:

    %Public%\Documents\DevExpress VCL Demos\MegaDemos\Product Demos\ExpressChart

    See Also