PlantUML之活动图

基本语法

每个普通节点：冒号开头，分号结尾
活动图的起始和结尾：start、end或stop

start
:case1;
:case2;
end

条件语句

start
if(predicate?) then (yes)
    :case yes;
else (no)
    :case no;
endif
end

多重条件语句

plaintUML里没有switch语法，只能使用elseif代替

start
note right:多分支条件语句，实现switch
if (condition A) then (yes)
  :Text 1;
elseif (condition B) then (yes)
  :Text 2;
  stop
elseif (condition C) then (yes)
  :Text 3;
elseif (condition D) then (yes)
  :Text 4;
else (nothing)
  :Text else;
endif
stop

do while循环

start
note right:do while循环
repeat
  :read data;
  :generate diagrams;
repeat while (more data?) is (yes)
stop

while后面可以跟is表达式来标识箭头

while do循环

start
note right:while do循环
while (check filesize ?) is (not empty)
  :read file;
endwhile (empty)
:close file;
end

while后面可以跟is表达式来标识箭头
endwhile后跟括号表达式来标识箭头

并行处理

start
note right:并行处理fork
if (multiprocessor?) then (yes)
  fork
    :Treatment 1;
  fork again
    :Treatment 2;
  end fork
else (monoproc)
  :Treatment 1;
  :Treatment 2;
endif
end

fork换成split，可以更改样式

注释

start
note right:添加注释
:foo1;
floating note left: This is a note
:foo2;
note right
  This note is on several
  //lines// and can
  contain HTML
  ====
  * Calling the method ""foo()"" is prohibited
end note
stop

一行注释可在note声明后跟冒号
多行注释需要换行，并用end note语句标识结束
浮动注释可使用floating关键字
note声明后可标识方位：仅支持left和right
文本格式支持creole wiki语法

节点颜色

start
note right:配置节点颜色
:starting progress;
#HotPink:reading configuration files
These files should edited at this point!;
#AAAAAA:ending of the process;
end

#开头，可使用色值或文字描述，需要放在语句前方

箭头颜色样式

start
note right:修改箭头颜色样式
:foo1;
-> You can put text on arrows;
if (test) then
  -[#blue]->
  :foo2;
  -[#green,dashed]-> The text can
  also be on several lines
  and **very** long...;
  :foo3;
else
  -[#black,dotted]->
  :foo4;
endif
-[#gray,bold]->
:foo5;
end

连接器

start
note right:连接器
:Some activity;
(A)
detach
(A)
:Other activity;
end

组合

start
note right:组合:定义分区
partition Initialization {
    :read config file;
    :init internal variable;
}
partition Running {
    :wait for user interaction;
    :print information;
}
stop

分离

start
note right:分离
 fork
   :foo1;
   :foo2;
 fork again
   :foo3;
   detach
 endfork
 if (foo4) then
   :foo5;
   detach
 endif
 :foo6;
 detach
 :foo7;
 stop

特殊领域语言

用其他符号代替分号结尾，可修改节点样式

• |
• <
• >
• /
• ]
• }

start
note right:特殊领域语言(SDL)
 :Ready;
 :next(o)|
 :Receiving;
 split
  :nak(i)<
  :ack(o)>
 split again
  :ack(i)<
  :next(o)
  on several line|
  :i := i + 1]
  :ack(o)>
 split again
  :err(i)<
  :nak(o)>
 split again
  :foo/
 split again
  :i > 5}
 stop
 end split
 :finish;
 end

泳道

泳道比较特殊，整个代码必须以泳道标识开头
类似于节点颜色，在语句前方可以设置颜色；后设置的颜色会覆盖之前设置的

|Swimlane1|
start
:foo1;
|#AntiqueWhite|Swimlane2|
:foo2;
:foo3;
|Swimlane1|
:foo4;
|Swimlane2|
:foo5;
stop