I’m building a chemistry app & I’d like to be able to use subscripts for displaying molecular formulae.
Can you please add this feature?
Is there a current known workaround by which we can implement this?
Thanks [import]uid: 92238 topic_id: 31391 reply_id: 331391[/import]
Apologies if it is not appropriate to post to this old feature request forum, but there is a simple workaround, though I haven’t seen a posting that says it. Just use utf8, a very easy solution that I use in my science apps. If you have the strings as literals, just cut/paste the subscripts and superscripts. If you are creating them dynamically, you can use this:
https://gist.github.com/pygy/7154512 [Thanks to Pierre-Yves Gérardy!]
That code contains:
function codepoint_to_utf8©
assert((55296 > c or c > 57343) and c < 1114112, “Bad Unicode code point: “…c…”.”)
if c < 128 then return string.char©
elseif c < 2048 then return string.char(192 + c/64, 128 + c%64)
elseif c < 55296 or 57343 < c and c < 65536 then return string.char(224 + c/4096, 128 + c/64%64, 128 + c%64)
elseif c < 1114112 then return string.char(240 + c/262144, 128 + c/4096%64, 128 + c/64%64, 128 + c%64)
end
end
To convert the unicode value into the unicode character, using that routine, just do
codepoint_to_utf8(8322)
for example to insert a subscript 2. Of course you have to convert each digit of a subscript/superscript separately, the utf8 only has single digits, but it has all 10 digits (8320-8329 for subscripts).
Apologies if it is not appropriate to post to this old feature request forum, but there is a simple workaround, though I haven’t seen a posting that says it. Just use utf8, a very easy solution that I use in my science apps. If you have the strings as literals, just cut/paste the subscripts and superscripts. If you are creating them dynamically, you can use this:
https://gist.github.com/pygy/7154512 [Thanks to Pierre-Yves Gérardy!]
That code contains:
function codepoint_to_utf8©
assert((55296 > c or c > 57343) and c < 1114112, “Bad Unicode code point: “…c…”.”)
if c < 128 then return string.char©
elseif c < 2048 then return string.char(192 + c/64, 128 + c%64)
elseif c < 55296 or 57343 < c and c < 65536 then return string.char(224 + c/4096, 128 + c/64%64, 128 + c%64)
elseif c < 1114112 then return string.char(240 + c/262144, 128 + c/4096%64, 128 + c/64%64, 128 + c%64)
end
end
To convert the unicode value into the unicode character, using that routine, just do
codepoint_to_utf8(8322)
for example to insert a subscript 2. Of course you have to convert each digit of a subscript/superscript separately, the utf8 only has single digits, but it has all 10 digits (8320-8329 for subscripts).