2 questions on customing caption of figure

[retsyo]

1. I have read https://typst.app/docs/reference/meta/figure/ now the caption is rendered as Figure 1: A curious figure. What if Figure 1 A curious figure or Figure 1 - A curious figure is need?

2. What if Figure 4-1 A curious figure is need? Where 4 means this in chapter 4, and 1 means the first figure in this chapter

# chap 1 soemthing

# chap 2 soemthing
+----------------+
| this is a figure  |
+----------------+
Figure 2-1 A curious figure

# chap 3 soemthing

# chap 4 soemthing
+----------------+
| this is a figure  |
+----------------+

Figure 4-1 A curious figure

thanks

[LaurenzV]

Does this do what you want?

#set heading(numbering: "1")

#show figure: it => align(center)[
  #it.body
  #it.supplement #counter(heading).display()-#counter(figure).display(it.numbering) #it.caption
]

#show heading: it => [
 #counter(figure).update(0)
 #it
]

= Chapter One

#figure(
  image("glacier.jpg", width: 80%),
  caption: [A curious figure.]
) <glacier>

#figure(
  image("glacier.jpg", width: 80%),
  caption: [A curious figure.]
) <glacier>

#figure(
  image("glacier.jpg", width: 80%),
  caption: [A curious figure.]
) <glacier>

 
= Chapter Two

#figure(
  image("glacier.jpg", width: 80%),
  caption: [A curious figure.]
) <glacier>

#figure(
  image("glacier.jpg", width: 80%),
  caption: [A curious figure.]
) <glacier>

#figure(
  image("glacier.jpg", width: 80%),
  caption: [A curious figure.]
) <glacier>

= Chapter Three

#figure(
  image("glacier.jpg", width: 80%),
  caption: [A curious figure.]
) <glacier>

[retsyo]

not exactly, there is some differences as the image says

#set heading(numbering: "1.1")

#show figure: it => align(center)[
  #it.body
  #it.supplement #counter(heading).display()-#counter(figure).display(it.numbering) #it.caption
]

#show heading: it => [
 #counter(figure).update(0)
 #it
]

= Chapter One

in @glacier

#figure(
  image("img/glacier.png", width: 30%),
  caption: [A curious figure.]
) 


== subheading of chap 1

in @glacier2

#figure(
  image("img/glacier.png", width: 30%),
  caption: [A curious figure.]
) 


#figure(
  image("img/glacier.png", width: 30%),
  caption: [A curious figure.]
) 


= Chapter Two

#figure(
  image("img/glacier.png", width: 30%),
  caption: [A curious figure.]
) 

#figure(
  image("img/glacier.png", width: 30%),
  caption: [A curious figure.]
) 

#figure(
  image("img/glacier.png", width: 30%),
  caption: [A curious figure.]
) 

= Chapter Three

#figure(
  image("img/glacier.png", width: 30%),
  caption: [A curious figure.]
) 

[LaurenzV]

Ah, I see. Here is a version that should do that (however, there seems to be a small bug, namely that if you reference to a picture under a different heading, it doesn't seem to work properly. See for example the second reference, which is referenced as "Figure 1-7" instead of "Figure 3-1". But I think this is a bug in Typst, so I can't really fix this right now. But I hope that still helps you:

#set heading(numbering: "1.1")

#show figure: it => align(center)[
  #locate(loc => [
    #it.body
    #it.supplement #counter(figure).display(it.numbering) #it.caption
  ])
]

#show heading.where(level: 1): it => [
 #counter(figure).update(0)
 #it
]

#set figure(numbering: it => {
  locate(loc => {
    [#counter(heading).at(loc).at(0)-#it]
  })
})

= Chapter One

in @glacier you can see.... And in @glacier3 you can see...

#figure(
  image("glacier.jpg", width: 30%),
  caption: [A curious figure.]
) <glacier>


== subheading of chap 1

in @glacier2

#figure(
  image("glacier.jpg", width: 30%),
  caption: [A curious figure.]
) <glacier2>


#figure(
  image("glacier.jpg", width: 30%),
  caption: [A curious figure.]
) 


= Chapter Two

#figure(
  image("glacier.jpg", width: 30%),
  caption: [A curious figure.]
) 

#figure(
  image("glacier.jpg", width: 30%),
  caption: [A curious figure.]
) 

#figure(
  image("glacier.jpg", width: 30%),
  caption: [A curious figure.]
) 

= Chapter Three

#figure(
  image("glacier.jpg", width: 30%),
  caption: [A curious figure.]
) <glacier3>

[retsyo]

btw, sometimes, the title of a figure and the figure itself run across 2 pages, can typst handle this situation, for example, by shrink the image a little shrink the distance between title and figure, or at least show warning for further investigation

thanks

[LaurenzV]

You can wrap everything in a #block(breakable: false)[], and then the caption and image should always stay on the same page.

[retsyo]

nice, thank you for your codes