图题想要实现“单行居中，多行左对齐”

[GodfatherPacino]

您好，
我的论文中因为图题caption比较长，很多图都出现了中英文图题多行的情况。
预答辩的时候，老师要求我，多行图题就跟正文一样左对齐，单行的时候居中。
目前的模板中，单行和多行都是默认居中。
我通过自己尝试将sjtuthesis.cls中修改为：\captionsetup{% format = plain, % format = hang, labelformat = simple, labelsep = enskip, % justification = centering, justification = raggedright, singlelinecheck = on, font = sjtu@caption@font }
但是目前是多行左对齐了，单行也左对齐了，singlelinecheck = on并没有发挥判断单行居中的作用。
试了好多了，头疼，求助。

[GodfatherPacino]

补充一下，我发现目前单行中文不居中，是因为英文是多行。如何解决

[GodfatherPacino]

我把sjtuthesis.cls中原来的\captionsetup[bi-second]{bi-second}改成\captionsetup[bi-second]{justification=raggedright}，并不行。

[AlexaraWu]

justification = centerlast

Update:

抱歉，之前没有认真审题 😂

\captionsetup{%
  format        = plain,
  labelformat   = simple,
  labelsep      = enskip,
  justification = justified,
  bi-slc        = off,
  font          = sjtu@caption@font
}

[GodfatherPacino]

刚试了一下，变成了这个效果。在多行情况下也不左对齐了。。。

[GodfatherPacino]

代码如下：\captionsetup{% format = plain, % format = hang, labelformat = simple, labelsep = enskip, % justification = centering, % justification = raggedright, justification = centerlast, singlelinecheck = on, font = sjtu@caption@font } \captionsetup[sub]{% format = hang, labelformat = brace, justification = justified, font = sjtu@subcaption@font } \DeclareCaptionOption{bi-second}[]{% \def\tablename{\sjtu@name@table@second} \def\figurename{\sjtu@name@figure@second} } \captionsetup[bi-second]{bi-second}

[AlexaraWu]

回答已更新，之前没有仔细看需求。有一个针对 bicaption 的 Single line check 选项，关闭它就可以了。

[GodfatherPacino]

非常感谢，成功了！
我帮你把逗号补上:)

\captionsetup{%
format = plain,
labelformat = simple,
labelsep = enskip,
justification = justified,
bi-slc = off,
font = sjtu@caption@font
}