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Linking Data to Visio Shapes in Code

One of the most useful capabilities of Visio Professional and Visio Plan 2 is to link external data to shapes and have them refreshed by changes in the data source. So, many of my solutions involve writing code to make these links, and they are covered with some VBA examples in my book, Mastering Data Visualization with Microsoft Visio Professional 2016, but I mostly write C# code in VSTO add-ins, so I thought it would be useful to demonstrate how easy it is to create data links by dropping a shape, and by adding links to an existing shape. The book, by the way, is still relevant for the current Visio Professional and Visio Plan 2 editions!

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Viewing Visio Document Changes in Git

Developing a Visio solution usually involves both .Net code and Visio ShapeSheet formulas. Good practice dictates that the source code is saved into a code repository, such as Git, where changes can be committed and commented. Visual Studio 2019 now includes native Git support, and can be linked to Azure DevOps easily. The code can be viewed by others and the changes made by commits can be reviewed. This is tried and tested for the .Net code, but any changes made to a Visio template, stencil or drawing document is a black box. If the Visio document is included in the Git project, then all that is visible is the fact that the file has been changed, but the detail of the actual changes are unknown. There may be some comments with the commit, but that is not a precise definition. So, what if there was a way to easily spot the changes?

  • Make a small change to a Visio master
  • It registers as a change in Git
  • Cannot see what actually changed in DevOps
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Getting the Microsoft Office Theme Value

I am working on a Visio VSTO project where I need to synchronise a UI element with the current session Microsoft Office Theme. At first, I thought that there would be some way of getting a value from the Visio object model, but I was wrong…

The Office Theme can be selected from either the Visio Options, or the Account Options panels.

  • Visio Options
  • Account Options
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Swapping Images in a Visio Shape

I often include images in Visio diagrams, and sometimes they are part of a group shape. There are times when I need to swap the image for another, and I want the correct width to height ratio for the new image to be applied, otherwise the image will be distorted. I recently realised that the Shape.ChangePicture() function in Visio actually returns this ratio which can then be applied to the shape cells so that the image is not distorted. Therefore I wrote some C# code (in LinqPad) to utilize this method to provide the option to change the image in a selected shape or sub-shape.

So, I wrote this function in C# to swap the image of the shape, and to apply the formulas to maintain its correct aspect ratio, even if the shape is subsequently resized.

ChangePicture
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Understanding Visio Connections

A reader recently asked if I could explain how to programmatically get the shapes connected to a shape in Visio. So, I thought I would have a go, because there are alternatives, depending upon which functions are used, and what parameters are passed to them. The following animated gif is rotating around the different types of selections that can be made from the lower Decision shape. Normally, two 2D shapes are connected together using a 1D shape. The 1D shape has a direction because it starts from “BeginX” and finishes at “EndX”. This is irrespective of an arrowheads that the user may have chosen to adorn the 1D connector with at either end.

multiSelect Children and Parents

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