I'm actually trying to generate a component diagram with PlantUml. Is it possible to define the relative position of the different components? What want to define is: ComponentB is left from ComponentA. ComponentC is below ComponentA, ...
A typical approach is to mark a line as hidden.
One thing to keep in mind is that hidden is only supported for left-to-right ->, and top-to-bottom --> lines, so you need to place the left and right side accordingly (syntax X <[hidden]- Y doesn't seem to be supported).
@startuml
class ComponentA
ComponentB -[hidden]> ComponentA
ComponentA -[hidden]-> ComponentC
@enduml
See also How to correct PlantUML Line Path for more positioning tips.
来源：https://stackoverflow.com/questions/45103284/plantuml-define-relative-position-of-components