Please provide a skinparam to limit the message length of ascii-art sequence diagrams

0 votes
asked Feb 2, 2016 in Closed feature request by anonymous
The normative form of an Internet RFC is the ASCII-7 version, limited to 78 characters in width.

Please provide a skinparam to limit the message length of ascii-art sequence diagrams, so I can achieve a diagram with 78 characters in width.

1 Answer

0 votes
answered Feb 2, 2016 by plantuml (278,240 points)
selected Jul 8, 2018 by Anthony-Gaudino
Best answer

We have just added the new skin parameter maxAsciiMessageLength in last beta:

The maxAsciiMessageLength receives a value which is the maximum size (in characters) between two lifelines.

With this version, you can have:

skinparam maxAsciiMessageLength 8

title RUE Automatic Configuration
box "RUE Side" #5fddd6
actor "RUE User" as RUEUSER
participant "RUE" as RUE
end box
box "Domain Name Service" #bb7068
participant DNS
end box
box "Configuration Service" #5c7068
participant "HTTPS Server" as CONFIGSERVER
participant "Provider Global Settings" AS PROVIDERSETTINGS
end box
box "Customer Relationship Management" #6fc65f
participant "CRM"
end box
autonumber "<b>[0]"
RUEUSER -> RUE: Select a VRS Provider name
RUE -> DNS: Look up SRV DNS for
DNS -> RUE: SRV DNS response with
RUE -> DNS: If SRV record found, look up DNS for
RUE -->> DNS: If SRV record does not exist, look up DNS for
DNS -> RUE: IP Address of Config Server
RUE -> CONFIGSERVER: TCP connection to 443: TLS: ClientHello (RFC-5246)
CONFIGSERVER -> RUE: TLS: ServerCertificate
CONFIGSERVER -->> RUE: TLS: ServerKeyExchange if required for premaster secret handshake
CONFIGSERVER -> RUE: HTTP: 401 Unauthorized WWW-Authenticate Digest\nusername="X" realm="Y" qop="auth,auth-int" nonce=...
RUE -> CONFIGSERVER: HTTP: Authorization Digest\nusername="X" realm="Y" qop="auth" nonce=...
CONFIGSERVER -> CRM: Find subscriber information\nfor username="X"
CRM -> CONFIGSERVER: Subscriber specific\nconfiguration information
CONFIGSERVER -> PROVIDERSETTINGS: Retrieve provider specific settings
PROVIDERSETTINGS -> CONFIGSERVER: Provider specific configuration information
CONFIGSERVER -> RUE: 200 OK + JSON key/value hash merge of subscriber specific and\nprovider specific configurations

We have added some \n in some message, so that the diagram fits in 78 columns.
Is this what you where expecting ?

commented Feb 2, 2016 by anonymous
Thank you.
It works.
commented Sep 27, 2019 by valexiev (1,180 points)

I can't believe how usable the asciiArt version is!

For comparison, here's the PNG

The source and two output files are at

commented May 19, 2021 by sarah (100 points)

This has been documented here: