PlantUML: Format message number in a sequence diagram

PlantUML internally use ‘java.text.DecimalFormat’ class to format the numbers. You can specify the number formatting in double quotes.

 

formatMessageNumber.txt

@startuml

autonumber 5 "<b>[000]"
p1 -> p2: msg1
p1 <- p2: msg2

autonumber 9 "<b>(<u>[000]</u>)"
p1 -> p2: msg3
p1 <- p2: msg4

autonumber 23 "<b>(<u>[###]</u>)"
p1 -> p2: msg5
p1 <- p2: msg6

autonumber 30 "<font color=red><b>Message 0 "
p1 -> p2: msg7
p1 -> p2: msg8

@enduml

 

Above snippet generate below diagram.

 

 

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