How to implement new GraphViz attribute?

Question

I'd like to implement the aspect attribute to see if it will better control the width Component diagrams (http://www.graphviz.org/content/attrs-test#daspect).

This attribute is supported in Graphviz 2.28.0.

Is it as simple as implementing a new SingleLineCommand (like CommandScale)?

Answer 1

Since this is a very asked feature, we have patched PlantUML so that the !pragma directive allows to specify an aspect ratio.
You can download : https://dl.dropboxusercontent.com/u/13064071/plantuml.jar

It was much simplier than creating a new command.

So for example, you can use:
@startuml
!pragma svek_trace on
!pragma aspect 2,5
 [component1]
 [component2]
@enduml

The "!pragma svek_trace on" line will create svek.dot/sveg.svg file on your machine so that you can check the result.
Tell us if it improves your diagrams, so that we can eventually add a real command (instead of using pragma).
 

Comments

Note that this snippet now crashes PlantUML. Providing a single number of a number such as 2.5 (dot instead of comma) won't work.