Hi,
Is it possible to put some classes on fixed positions.
Like in this example, the yellow classes should always be on those place, and the classes between, should be calculated.
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not by default as graphviz does the layout. However, you may try a workaround by using directions and [hidden] connections, but I think you won't be happy with the result.
http://www.plantuml.com/plantuml/uml/ZP0nhiCm34DtdK8VV_YJWDYvGExnqK6rtII0umQAEXMzUnLFwjQ9fFr0mfuEPT77Lk5d5vutnbfkYdf7MUT5GKfIRdCj-Al2xTXPIbDykelWV7H-X1T0GFfVrfnBksIA47qSuQlwmOVWGxI5CFZA4mWVcoVbcMed07z4v9hO-Qlp2VeBAXd1NQrjH18oB7PDaBhQy5HQjfzy0m00
BR,
Michael