6 COMPONENT DIAGRAM

6 Component Diagram

6.1Components

Components must be bracketed.

You can also use the component keyword to defines a component. And you can define an alias, using the as keyword. This alias will be used latter, when defining relations.

@startuml

[First component]

[Another component] as Comp2 component Comp3

component [Last\ncomponent] as Comp4 @enduml

6.2Interfaces

Interface can be defined using the () symbol (because this looks like a circle).

You can also use the interface keyword to defines an interface. And you can define an alias, using the as keyword. This alias will be used latter, when defining relations.

We will see latter that interface definition is optional.

@startuml

() "First Interface"

() "Another interface" as Interf2 interface Interf3

interface "Last\ninterface" as Interf4 @enduml

6.3Basic example

Links between elements are made using combinations of dotted line (..), straight line (--), and arrows (-->) symbols.

@startuml

package "Some Group" { HTTP - [First Component] [Another Component]

}

node "Other Groups" { FTP - [Second Component]

[First Component] --> FTP

}

cloud {

[Example 1]

}

database "MySql" {

folder "This is my folder" { [Folder 3]

}

frame "Foo" { [Frame 4]

}

}

[Another Component] --> [Example 1] [Example 1] --> [Folder 3]

[Folder 3] --> [Frame 4] @enduml

6.6Changing arrows direction

By default, links between classes have two dashes -- and are vertically oriented. It is possible to use horizontal link by putting a single dash (or dot) like this:

@startuml

[Component] --> Interface1 [Component] -> Interface2 @enduml

You can also change directions by reversing the link:

@startuml

Interface1 <-- [Component] Interface2 <- [Component] @enduml

It is also possible to change arrow direction by adding left, right, up or down keywords inside the arrow:

@startuml

[Component] -left -> left

[Component] -right -> right [Component] -up-> up

[Component] -down -> down @enduml

You can shorten the arrow by using only the first character of the direction (for example, -d- instead of -down-) or the two first characters (-do-).

Please note that you should not abuse this functionality : Graphviz gives usually good results without tweaking.

6.7Title the diagram

The title keywords is used to put a title.

You can use title and end title keywords for a longer title, as in sequence diagrams.