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Setting a Background Image on a Diagram

In Visual Studio Visualization and Modeling SDK, you can set the background image for a generated designer by using custom code.

To set a background image for a generated designer

  1. Copy the image file that you want to use as the diagram's background into the Dsl\Resources directory for the current project.

  2. In Solution Explorer, right-click the Dsl\Resources folder, point to Add, and then click Existing Item.

  3. In the Add Existing Item dialog box, browse to the Dsl\Resources folder.

  4. In the Files of type list, click Image Files.

  5. Click the image file that you copied to the directory, and then click Add.

  6. Right-click Dsl, and click Properties to open the properties of the Dsl project.

  7. On the Resources tab, click This project does not contain a default resources file. Click here to create one.

  8. Add the image file to the resource file by dragging the picture from Solution Explorer into the resources window.

  9. Open the File menu, and click the option to save the project properties.

  10. Verify that the file Dsl\Properties\Resources.resx exists and has the file Resources.Designer.cs under it.

  11. If Resources.Designer.cs is missing, click the file Resources.resx in Solution Explorer.

  12. In the Properties window, set the Custom Tool property to ResXFileCodeGenerator.

  13. In Solution Explorer, right-click the Dsl project, point to Add, and click New Folder.

  14. Name the folder Custom.

  15. Right-click the Custom folder, point to Add, and click New Item.

  16. In the Add New Item dialog box, in the Templates list, click Code File.

  17. In the Name box, type BackgroundImage.cs, and click Add.

  18. Copy the following code to the BackgroundImage.cs file, adjusting namespace, diagram class name, and image file resource name.

    Replace "MyDiagramClass" with the name of the diagram partial class that is defined in Dsl\GeneratedCode\Diagrams.cs. You can also retrieve the correct namespace from the file Dsl\GeneratedCode\Diagrams.cs.

    using System;
    using Microsoft.VisualStudio.Modeling.Diagrams;
    
    // Fix the namespace:
    namespace Fabrikam.MyLanguage
    {
      // Fix the Diagram Class name - get it from GeneratedCode\Diagram.cs
    
      public partial class Language29Diagram
      {
        protected override void InitializeInstanceResources()
        {
          // Fix the Resources namespace and the Image resource name:
          ImageField backgroundField = new ImageField("background",
              Fabrikam.MyLanguage.Properties.Resources.MyPicture);
    
          backgroundField.DefaultFocusable = false;
          backgroundField.DefaultSelectable = false;
          backgroundField.DefaultVisibility = true;
          backgroundField.DefaultUnscaled = false;
    
          shapeFields.Add(backgroundField);
    
          backgroundField.AnchoringBehavior
            .SetTopAnchor(AnchoringBehavior.Edge.Top, 0.01);
          backgroundField.AnchoringBehavior
            .SetLeftAnchor(AnchoringBehavior.Edge.Left, 0.01);
          backgroundField.AnchoringBehavior
            .SetRightAnchor(AnchoringBehavior.Edge.Right, 0.01);
          backgroundField.AnchoringBehavior
            .SetBottomAnchor(AnchoringBehavior.Edge.Bottom, 0.01);
    
          base.InitializeInstanceResources();
        }
      }
    }
    

    For more information about customizing the model with program code, see Navigating and Updating a Model in Program Code.

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