PlantUMLLanguage specificationState Diagram

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State Diagram

State diagrams are used to give an abstract description of the behavior of a system. This behavior is represented as a series of events that can occur in one or more possible states.

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Simple State

You can use [*] for the starting point and ending point of the state diagram.

Use --> for arrows.

🎉 Copied! 

@startuml

[*] --> State1
State1 --> [*]
State1 : this is a string
State1 : this is another string

State1 -> State2
State2 --> [*]

@enduml

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Change state rendering

You can use hide empty description to render state as simple box.

🎉 Copied! 

@startuml
hide empty description
[*] --> State1
State1 --> [*]
State1 : this is a string
State1 : this is another string

State1 -> State2
State2 --> [*]
@enduml

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Composite state

A state can also be composite. You have to define it using the state keywords and brackets.

Internal sub-state

🎉 Copied! 

@startuml
scale 350 width
[*] --> NotShooting

state NotShooting {
  [*] --> Idle
  Idle --> Configuring : EvConfig
  Configuring --> Idle : EvConfig
}

state Configuring {
  [*] --> NewValueSelection
  NewValueSelection --> NewValuePreview : EvNewValue
  NewValuePreview --> NewValueSelection : EvNewValueRejected
  NewValuePreview --> NewValueSelection : EvNewValueSaved

  state NewValuePreview {
     State1 -> State2
  }

}
@enduml

Sub-state to sub-state

🎉 Copied! 

@startuml
state A {
  state X {
  }
  state Y {
  }
}
 
state B {
  state Z {
  }
}

X --> Z
Z --> Y
@enduml

[Ref. QA-3300]

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Long name

You can also use the state keyword to use long description for states.

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@startuml
scale 600 width

[*] -> State1
State1 --> State2 : Succeeded
State1 --> [*] : Aborted
State2 --> State3 : Succeeded
State2 --> [*] : Aborted
state State3 {
  state "Accumulate Enough Data\nLong State Name" as long1
  long1 : Just a test
  [*] --> long1
  long1 --> long1 : New Data
  long1 --> ProcessData : Enough Data
}
State3 --> State3 : Failed
State3 --> [*] : Succeeded / Save Result
State3 --> [*] : Aborted

@enduml

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History [[H], [H*]]

You can use [H] for the history and [H*] for the deep history of a substate.

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@startuml
[*] -> State1
State1 --> State2 : Succeeded
State1 --> [*] : Aborted
State2 --> State3 : Succeeded
State2 --> [*] : Aborted
state State3 {
  state "Accumulate Enough Data" as long1
  long1 : Just a test
  [*] --> long1
  long1 --> long1 : New Data
  long1 --> ProcessData : Enough Data
  State2 --> [H]: Resume
}
State3 --> State2 : Pause
State2 --> State3[H*]: DeepResume
State3 --> State3 : Failed
State3 --> [*] : Succeeded / Save Result
State3 --> [*] : Aborted
@enduml

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Fork [fork, join]

You can also fork and join using the <<fork>> and <<join>> stereotypes.

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@startuml

state fork_state <<fork>>
[*] --> fork_state
fork_state --> State2
fork_state --> State3

state join_state <<join>>
State2 --> join_state
State3 --> join_state
join_state --> State4
State4 --> [*]

@enduml

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Concurrent state [--, ||]

You can define concurrent state into a composite state using either -- or || symbol as separator.

Horizontal separator --

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@startuml
[*] --> Active

state Active {
  [*] -> NumLockOff
  NumLockOff --> NumLockOn : EvNumLockPressed
  NumLockOn --> NumLockOff : EvNumLockPressed
  --
  [*] -> CapsLockOff
  CapsLockOff --> CapsLockOn : EvCapsLockPressed
  CapsLockOn --> CapsLockOff : EvCapsLockPressed
  --
  [*] -> ScrollLockOff
  ScrollLockOff --> ScrollLockOn : EvScrollLockPressed
  ScrollLockOn --> ScrollLockOff : EvScrollLockPressed
}

@enduml

Vertical separator ||

🎉 Copied! 

@startuml
[*] --> Active

state Active {
  [*] -> NumLockOff
  NumLockOff --> NumLockOn : EvNumLockPressed
  NumLockOn --> NumLockOff : EvNumLockPressed
  ||
  [*] -> CapsLockOff
  CapsLockOff --> CapsLockOn : EvCapsLockPressed
  CapsLockOn --> CapsLockOff : EvCapsLockPressed
  ||
  [*] -> ScrollLockOff
  ScrollLockOff --> ScrollLockOn : EvScrollLockPressed
  ScrollLockOn --> ScrollLockOff : EvScrollLockPressed
}

@enduml

[Ref. QA-3086]

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Conditional [choice]

The stereotype <<choice>> can be used to use conditional state.

🎉 Copied! 

@startuml
state "Req(Id)" as ReqId <<sdlreceive>>
state "Minor(Id)" as MinorId
state "Major(Id)" as MajorId
 
state c <<choice>>
 
Idle --> ReqId
ReqId --> c
c --> MinorId : [Id <= 10]
c --> MajorId : [Id > 10]
@enduml

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Stereotypes full example [start, choice, fork, join, end]

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@startuml
state start1  <<start>>
state choice1 <<choice>>
state fork1   <<fork>>
state join2   <<join>>
state end3    <<end>>

[*]     --> choice1 : from start\nto choice
start1  --> choice1 : from start stereo\nto choice

choice1 --> fork1   : from choice\nto fork
choice1 --> join2   : from choice\nto join
choice1 --> end3    : from choice\nto end stereo

fork1   ---> State1 : from fork\nto state
fork1   --> State2  : from fork\nto state

State2  --> join2   : from state\nto join
State1  --> [*]     : from state\nto end

join2   --> [*]     : from join\nto end
@enduml

[Ref. QA-404, QA-1159 and GH-887]

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Point [entryPoint, exitPoint]

You can add point with <<entryPoint>> and <<exitPoint>> stereotypes:

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@startuml
state Somp {
  state entry1 <<entryPoint>>
  state entry2 <<entryPoint>>
  state sin
  entry1 --> sin
  entry2 -> sin
  sin -> sin2
  sin2 --> exitA <<exitPoint>>
}

[*] --> entry1
exitA --> Foo
Foo1 -> entry2
@enduml

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Pin [inputPin, outputPin]

You can add pin with <<inputPin>> and <<outputPin>> stereotypes:

🎉 Copied! 

@startuml
state Somp {
  state entry1 <<inputPin>>
  state entry2 <<inputPin>>
  state sin
  entry1 --> sin
  entry2 -> sin
  sin -> sin2
  sin2 --> exitA <<outputPin>>
}

[*] --> entry1
exitA --> Foo
Foo1 -> entry2
@enduml

[Ref. QA-4309]

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Expansion [expansionInput, expansionOutput]

You can add expansion with <<expansionInput>> and <<expansionOutput>> stereotypes:

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@startuml
state Somp {
  state entry1 <<expansionInput>>
  state entry2 <<expansionInput>>
  state sin
  entry1 --> sin
  entry2 -> sin
  sin -> sin2
  sin2 --> exitA <<expansionOutput>>
}

[*] --> entry1
exitA --> Foo
Foo1 -> entry2
@enduml

[Ref. QA-4309]

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Arrow direction

You can use -> for horizontal arrows. It is possible to force arrow's direction using the following syntax:
  • -down-> or -->
  • -right-> or ->(default arrow)
  • -left->
  • -up->

🎉 Copied! 

@startuml

[*] -up-> First
First -right-> Second
Second --> Third
Third -left-> Last

@enduml

You can shorten the arrow definition 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.

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Change line color and style

You can change line color and/or line style.

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@startuml
State S1
State S2
S1 -[#DD00AA]-> S2
S1 -left[#yellow]-> S3
S1 -up[#red,dashed]-> S4
S1 -right[dotted,#blue]-> S5

X1 -[dashed]-> X2
Z1 -[dotted]-> Z2
Y1 -[#blue,bold]-> Y2
@enduml

[Ref. Incubation: Change line color in state diagrams]

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Note

You can also define notes using note left of, note right of, note top of, note bottom of keywords.

You can also define notes on several lines.

🎉 Copied! 

@startuml

[*] --> Active
Active --> Inactive

note left of Active : this is a short\nnote

note right of Inactive
  A note can also
  be defined on
  several lines
end note

@enduml

You can also have floating notes.

🎉 Copied! 

@startuml

state foo
note "This is a floating note" as N1

@enduml

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Note on link

You can put notes on state-transition or link, with note on link keyword.

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@startuml
[*] -> State1
State1 --> State2
note on link 
  this is a state-transition note 
end note
@enduml

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More in notes

You can put notes on composite states.

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@startuml

[*] --> NotShooting

state "Not Shooting State" as NotShooting {
  state "Idle mode" as Idle
  state "Configuring mode" as Configuring
  [*] --> Idle
  Idle --> Configuring : EvConfig
  Configuring --> Idle : EvConfig
}

note right of NotShooting : This is a note on a composite state

@enduml

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Inline color

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@startuml
state CurrentSite #pink {
    state HardwareSetup #lightblue {
       state Site #brown
        Site -[hidden]-> Controller
        Controller -[hidden]-> Devices
    }
    state PresentationSetup{
        Groups -[hidden]-> PlansAndGraphics
    }
    state Trends #FFFF77
    state Schedule #magenta
    state AlarmSupression
}
@enduml

[Ref. QA-1812]

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Skinparam

You can use the skinparam command to change colors and fonts for the drawing.

You can use this command : You can define specific color and fonts for stereotyped states.

🎉 Copied! 

@startuml
skinparam backgroundColor LightYellow
skinparam state {
  StartColor MediumBlue
  EndColor Red
  BackgroundColor Peru
  BackgroundColor<<Warning>> Olive
  BorderColor Gray
  FontName Impact
}

[*] --> NotShooting

state "Not Shooting State" as NotShooting {
  state "Idle mode" as Idle <<Warning>>
  state "Configuring mode" as Configuring
  [*] --> Idle
  Idle --> Configuring : EvConfig
  Configuring --> Idle : EvConfig
}

NotShooting --> [*]
@enduml

Test of all specific skinparam to State Diagrams

🎉 Copied! 

@startuml
skinparam State {
  AttributeFontColor blue
  AttributeFontName serif
  AttributeFontSize  9
  AttributeFontStyle italic
  BackgroundColor palegreen
  BorderColor violet
  EndColor gold
  FontColor red
  FontName Sanserif
  FontSize 15
  FontStyle bold
  StartColor silver
}

state A : a a a\na
state B : b b b\nb

[*] -> A  : start
A -> B : a2b
B -> [*] : end
@enduml

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Changing style

You can change style.

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@startuml

<style>
stateDiagram {
  BackgroundColor Peru
  'LineColor Gray
  FontName Impact
  FontColor Red
  arrow {
    FontSize 13
    LineColor Blue
  }
}
</style>


[*] --> NotShooting

state "Not Shooting State" as NotShooting {
  state "Idle mode" as Idle <<Warning>>
  state "Configuring mode" as Configuring
  [*] --> Idle
  Idle --> Configuring : EvConfig
  Configuring --> Idle : EvConfig
}

NotShooting --> [*]
@enduml

🎉 Copied! 

@startuml
<style>
  diamond {
    BackgroundColor #palegreen
    LineColor #green
    LineThickness 2.5
}
</style>
state state1
state state2 
state choice1 <<choice>>
state end3    <<end>>

state1  --> choice1 : 1
choice1 --> state2  : 2
choice1 --> end3    : 3
@enduml

[Ref. GH-880]

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Change state color and style (inline style)

You can change the color or style of individual state using the following notation:

  • #color ##[style]color

With background color first (#color), then line style and line color (##[style]color ).

🎉 Copied! 

@startuml
state FooGradient #red-green ##00FFFF
state FooDashed #red|green ##[dashed]blue {
}
state FooDotted ##[dotted]blue {
}
state FooBold ##[bold] {
}
state Foo1 ##[dotted]green {
state inner1 ##[dotted]yellow
}

state out ##[dotted]gold

state Foo2 ##[bold]green {
state inner2 ##[dotted]yellow
}
inner1 -> inner2
out -> inner2
@enduml

[Ref. QA-1487]

  • #color;line:color;line.[bold|dashed|dotted];text:color

FIXME
🚩 text:color seems not to be taken into account
FIXME

🎉 Copied! 

@startuml
@startuml
state FooGradient #red-green;line:00FFFF
state FooDashed #red|green;line.dashed;line:blue {
}
state FooDotted #line.dotted;line:blue {
}
state FooBold #line.bold {
}
state Foo1 #line.dotted;line:green {
state inner1 #line.dotted;line:yellow
}

state out #line.dotted;line:gold

state Foo2 #line.bold;line:green {
state inner2 #line.dotted;line:yellow
}
inner1 -> inner2
out -> inner2
@enduml
@enduml

🎉 Copied! 

@startuml
state s1 : s1 description
state s2 #pink;line:red;line.bold;text:red : s2 description
state s3 #palegreen;line:green;line.dashed;text:green : s3 description
state s4 #aliceblue;line:blue;line.dotted;text:blue   : s4 description
@enduml

[Adapted from QA-3770]

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Alias

With State you can use alias, like:

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@startuml
state alias1 
state "alias2"
state "long name" as alias3
state alias4 as "long name"

alias1 : ""state alias1""
alias2 : ""state "alias2"""
alias3 : ""state "long name" as alias3""
alias4 : ""state alias4 as "long name"""

alias1 -> alias2
alias2 -> alias3
alias3 -> alias4
@enduml

or:

🎉 Copied! 

@startuml
state alias1 : ""state alias1""
state "alias2" : ""state "alias2"""
state "long name" as alias3 : ""state "long name" as alias3""
state alias4 as "long name" : ""state alias4 as "long name"""

alias1 -> alias2
alias2 -> alias3
alias3 -> alias4
@enduml

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Display JSON Data on State diagram

Simple example

🎉 Copied! 

@startuml
state "A" as stateA
state "C" as stateC {
 state B
}

json jsonJ {
   "fruit":"Apple",
   "size":"Large",
   "color": ["Red", "Green"]
}
@enduml

[Ref. QA-17275]

For another example, see on JSON page.

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