UML is á rich language, ánd PlantUML suppórts much óf it, in additión to some nón-UML diagrams.If youre using a traditional drawing tool, that can be tedious.
Visual Studio Code Markdown Preview Software Design ThatUML UML is the acronym for Universal Modeling Language, an effort to standardize an iconography for software design that first appeared 25 years ago. Though perhaps it has not lived up to the larger ambitions of its designers, it still offers a consistent way to visualize various facets of software design. PlantUML Drawing UML diagrams is tedious, but what if you could instead describe a UML diagram textually, in a way that you could include it directly in a Markdown-based document, see both diagrams and formatted text in a preview as your are editing it, and in addition can export the Markdown as HTML or PDF Your text and diagrams are seamlessly integrated in one file. VS Code VisuaI Studio Code (á.k.a. VS Code) hás become a popuIar editor for varióus computer languages, incIuding Markdown. With a singIe extension, you cán visualize UML diágrams in VS Codés preview panel. Visual Studio Code Markdown Preview Install It EitherThat extension is called plantuml, and you can install it either by searching for it in the extensions panel (click on the extension icon): then clicking install, or simply by running the following from a terminal pane (Ctrl gets you one): ext install plantuml Youll also need to have some version of Java installed, with JAVAHOME environment variable set or an executable path with the java binary location in it. Adding PlantUML to your Markdown With the extension installed, you can now insert UML diagrams using PlantUML language. Here I wiIl embed PlantUML márkup to generate á sequence diagram. ![]() Thats great, but what if you want to export a diagram from within the Markdown For that youll need a little help from your friends. Exporting to SVG or PNG In order to export individual diagrams, I need to install GraphViz, which is open source graph visualization software. It works in conjunction with the plantuml extension installed earlier. Unlike plantuml, it is not a VS Code extension, but an executable. To export to SVG or PNG: place your cursor within the desired PlantUML text, open the command palette (Ctrl-Shift-P on my PC); or right click and select Command Palette. Choose PlantUML: Export Current Diagram You can choose PNG, SVG, or other formats. Heres the PNG and SVG versions of the diagram shown in the Preview pane, above: PNG SVG You also have the option to export all diagrams within a Markdown document (command palette option PlantUML: Export Current File Diagrams), which will create separate image files for each diagram. For instance, my Markdown doc is named basic.md and when I export all diagrams (there are three) as SVG, three image files are generated: basic.svg (the sequence diagram already shown) basic-1.svg (a class diagram) uml: class diagram. Further functionality Thére is another usefuI VS Code éxtension called Markdown Préview Enhanced. This adds á second preview pané in addition tó VS Codes nativé Preview pane. ![]() Export to PDF Markdown Preview Enhanced is able to work with the Chrome browser to generate PDF documents, through the Puppeteer driver. ![]() To export simply right click in the Markdown Preview Enhanced pane and select Chome (Puppeteer) - PDF: It takes a few seconds, but the PDF will eventually be generated and your default browser will open (not necessarily Chrome) with the PDF document displayed.
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