skinparam with multiple stereotype dependencies

Question

I have some overlapping stereotype dependent skinparameter like below with 2 different background colors.
How can I define it, that all 3 exampleBase... are violet?

Thank you and best regards

Helmut

@startuml

skinparam component {
    ' only an "explicit combined" definition is supported
    BackgroundColor<<example|base>> Violet
    ' but not a list of 2
    BackgroundColor<<example>><<base>> Violet
    BackgroundColor<<base>> LightBlue
    BackgroundColor<<example>> Red
}

    [origComponent]
    [baseComponent1]<<base>>
    [exampleComponent1]<<example>>
    [exampleBaseComponent1]<<example|base>>
    [exampleBaseComponent2]<<base>><<example>>
    [exampleBaseComponent3]<<example>><<base>>

origComponent <-U- baseComponent1
origComponent <-U- exampleComponent1
baseComponent1 <-U- exampleBaseComponent1
exampleComponent1 <-U- exampleBaseComponent1
@enduml

 

Comments

I think you meant to file this as a wanted feature (to be able to define styles for stereotype combinations that take precedence over the individual stereotype styles).

But to answer your question on how your idea can be achieved, here's one method using a custom procedure:

@startuml
skinparam component {
    BackgroundColor<<example|base>> Violet
    BackgroundColor<<base>> LightBlue
    BackgroundColor<<example>> Red
}

!procedure MyComponent($name, $stereo)
!if ($stereo == "<<example>><<base>>" || $stereo == "<<base>><<example>>") 
#Violet $name $stereo
!else
$name $stereo
!endif 
!endprocedure

    MyComponent("[origComponent]", "")
    MyComponent("[baseComponent1]", "<<base>>")
    MyComponent("[exampleComponent1]", "<<example>>")
    MyComponent("[exampleBaseComponent1]", "<<example|base>>")
    MyComponent("[exampleBaseComponent2]", "<<base>><<example>>")
    MyComponent("[exampleBaseComponent3]", "<<example>><<base>>")

origComponent <-U- baseComponent1
origComponent <-U- exampleComponent1
baseComponent1 <-U- exampleBaseComponent1
exampleComponent1 <-U- exampleBaseComponent1
@enduml