@startuml
(First usecase)
(Another usecase) as (UC2)
usecase UC3
usecase (Last\nusecase) as UC4
@enduml
Usecases
Use cases are enclosed using between parentheses (because two
parentheses looks like an oval).
You can also use the usecase keyword to define a
usecase.
And you can define an alias, using the as keyword.
This alias will be used later, when defining relations.
@startuml
(First usecase)
(Another usecase) as (UC2)
usecase UC3
usecase (Last\nusecase) as UC4
@enduml
@startuml
:First Actor:
:Another\nactor: as Men2
actor Men3
actor :Last actor: as Men4
@enduml
Actors
Actor are enclosed using between two points.
You can also use the actor keyword to define an
actor.
And you can define an alias, using the as keyword.
This alias will be used latter, when defining relations.
We will see later that the actor definitions are optional.
@startuml
:First Actor:
:Another\nactor: as Men2
actor Men3
actor :Last actor: as Men4
@enduml
@startuml
usecase UC1 as "You can use
several lines to define your usecase.
You can also use separators.
--
Several separators are possible.
==
And you can add titles:
..Conclusion..
This allows large description."
@enduml
Usecases description
If you want to have description on several lines, you can use quotes.
You can also use the following separators: --..==__.
And you can put titles within the separators.
@startuml
usecase UC1 as "You can use
several lines to define your usecase.
You can also use separators.
--
Several separators are possible.
==
And you can add titles:
..Conclusion..
This allows large description."
@enduml
Use package
You can use packages to group actors or use cases.
@startuml
left to right direction
actor "Food Critic" as fc
package Restaurant {
usecase "Eat Food" as UC1
usecase "Pay for Food" as UC2
usecase "Drink" as UC3
}
fc --> UC1
fc --> UC2
fc --> UC3
@enduml
You can use rectangle to change the display of the package.
@startuml
left to right direction
actor "Food Critic" as fc
rectangle Restaurant {
usecase "Eat Food" as UC1
usecase "Pay for Food" as UC2
usecase "Drink" as UC3
}
fc --> UC1
fc --> UC2
fc --> UC3
@enduml
@startuml
User -> (Start)
User --> (Use the application) : A small label
:Main Admin: ---> (Use the application) : This is\nyet another\nlabel
@enduml
Basic example
To link actors and use cases, the arrow --> is
used.
The more dashes - in the arrow, the longer the
arrow.
You can add a label on the arrow, by adding a :
character in the arrow definition.
In this example, you see that User has not been defined
before, and is used as an actor.
@startuml
User -> (Start)
User --> (Use the application) : A small label
:Main Admin: ---> (Use the application) : This is\nyet another\nlabel
@enduml
继承
如果一个角色或者用例继承于另一个，那么可以用<|--符号表示。
@startuml
:Main Admin: as Admin
(Use the application) as (Use)
User <|-- Admin
(Start) <|-- (Use)
@enduml
Extension
If one actor/use case extends another one, you can use the symbol <|--.
@startuml
:Main Admin: as Admin
(Use the application) as (Use)
User <|-- Admin
(Start) <|-- (Use)
@enduml
使用注释
可以用note left of , note right of ,
note top of , note bottom of等关键字给一个对象添加注释。
注释还可以通过note关键字来定义，然后用..连接其他对象。
@startuml
:Main Admin: as Admin
(Use the application) as (Use)
User -> (Start)
User --> (Use)
Admin ---> (Use)
note right of Admin : This is an example.
note right of (Use)
A note can also
be on several lines
end note
note "This note is connected\nto several objects." as N2
(Start) .. N2
N2 .. (Use)
@enduml
Using notes
You can use the note left of , note right of ,
note top of , note bottom of keywords to
define notes related to a single object.
A note can be also define alone with the note
keywords, then linked to other objects using the .. symbol.
@startuml
:Main Admin: as Admin
(Use the application) as (Use)
User -> (Start)
User --> (Use)
Admin ---> (Use)
note right of Admin : This is an example.
note right of (Use)
A note can also
be on several lines
end note
note "This note is connected\nto several objects." as N2
(Start) .. N2
N2 .. (Use)
@enduml
构造类型
用 <<
和 >> 来定义角色或者用例的构造类型。
@startuml
User << Human >>
:Main Database: as MySql << Application >>
(Start) << One Shot >>
(Use the application) as (Use) << Main >>
User -> (Start)
User --> (Use)
MySql --> (Use)
@enduml
Stereotypes
You can add stereotypes while defining actors and use cases using << and >>.
@startuml
User << Human >>
:Main Database: as MySql << Application >>
(Start) << One Shot >>
(Use the application) as (Use) << Main >>
User -> (Start)
User --> (Use)
MySql --> (Use)
@enduml
改变箭头方向
默认连接是竖直方向的，用--表示，可以用一个横杠或点来表示水平连接。
@startuml
:user: --> (Use case 1)
:user: -> (Use case 2)
@enduml
也可以通过翻转箭头来改变方向。
@startuml
(Use case 1) <.. :user:
(Use case 2) <- :user:
@enduml
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
:user: --> (Use case 1)
:user: -> (Use case 2)
@enduml
You can also change directions by reversing the link:
@startuml
(Use case 1) <.. :user:
(Use case 2) <- :user:
@enduml
It is also possible to change arrow direction by adding left, right, up
or down keywords inside the arrow:
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.
@startuml
skinparam handwritten true
skinparam usecase {
BackgroundColor DarkSeaGreen
BorderColor DarkSlateGray
BackgroundColor<< Main >> YellowGreen
BorderColor<< Main >> YellowGreen
ArrowColor Olive
ActorBorderColor black
ActorFontName Courier
ActorBackgroundColor<< Human >> Gold
}
User << Human >>
:Main Database: as MySql << Application >>
(Start) << One Shot >>
(Use the application) as (Use) << Main >>
User -> (Start)
User --> (Use)
MySql --> (Use)
@enduml
Skinparam
You can use the skinparam
command to change colors and fonts for the drawing.
You can use this command :
In the diagram definition, like any other commands,
You can define specific color and fonts for stereotyped actors and usecases.
@startuml
skinparam handwritten true
skinparam usecase {
BackgroundColor DarkSeaGreen
BorderColor DarkSlateGray
BackgroundColor<< Main >> YellowGreen
BorderColor<< Main >> YellowGreen
ArrowColor Olive
ActorBorderColor black
ActorFontName Courier
ActorBackgroundColor<< Human >> Gold
}
User << Human >>
:Main Database: as MySql << Application >>
(Start) << One Shot >>
(Use the application) as (Use) << Main >>
User -> (Start)
User --> (Use)
MySql --> (Use)
@enduml
一个完整的例子
@startuml
left to right direction
skinparam packageStyle rectangle
actor customer
actor clerk
rectangle checkout {
customer -- (checkout)
(checkout) .> (payment) : include
(help) .> (checkout) : extends
(checkout) -- clerk
}
@enduml
Complete example
@startuml
left to right direction
skinparam packageStyle rectangle
actor customer
actor clerk
rectangle checkout {
customer -- (checkout)
(checkout) .> (payment) : include
(help) .> (checkout) : extends
(checkout) -- clerk
}
@enduml
