PlantUML: 使用简单的文字描述画UML图，入门

PlantUML: 使用简单的文字描述画UML图，入门

概述

PlantUML支持的UML图类别还挺多的：时序图，用例图，类图，活动图，组件图，状态图，对象图等。

文字描述UML图的好处或特点：

轻量级，文本编辑器即可操作（本地安装PlantUML或在线工具解析）

类似于word vs latex，虽然少了图形拖拽，但可以自动按描述生成对象和布局，对于熟悉者，更方便

文本，便于版本控制

入门文档方面，官方的文档也很丰富。

官网：http://plantuml.com/

在线编辑

在线编辑器1：http://www.plantuml.com/plantuml/uml/

在线编辑器2：https://www.planttext.com/

实战

以下是实现Simon Game之前，尝试用PlantUML画的状态机。

@startuml

title Simon Game
state "Game Ready" as sGameReady
state "Game In Progress" as sGameInProgress {
state "Game Beginning" as sGameBeginning
state "Generate One More Step" as sGameOneMore
state "Series Presentation" as sGamePresentation
state "Series Re-press" as sGameRepress

sGameBeginning: Random series is empty: n=0:
sGameOneMore:  n=n+1, generate one more step
sGamePresentation: show series and play sound
sGameRepress: play sound

[*] --> sGameBeginning
sGameBeginning-left-> sGameOneMore
sGameOneMore-down-> sGamePresentation
sGamePresentation-right->sGameRepress: presentation over
sGameRepress-left->sGamePresentation: failed, strictmode==false
sGameRepress-up->sGameOneMore: succeed, n<20
sGameRepress-up->sGameBeginning: failed, strictmode==true
sGameRepress -->[*]:succeed, n==20
}
state "Game Success" as sGameSuccess
[*] --> sGameReady: swich on
sGameReady-right->sGameInProgress: click start button
sGameInProgress-right->sGameSuccess: n==20, succeeded
sGameSuccess -left-> sGameInProgress: click start button

sGameReady-->[*]: switch off
sGameInProgress-->[*]: switch off
sGameSuccess-->[*]: switch off

@enduml

效果图（使用在线编辑器2)