Issue 60591 - Labeled arrows is missing
Labeled arrows is missing
 Status: CONFIRMED None Math Application code (show other issues) OOo 2.0.1 All All P4 Trivial with 4 votes (vote) --- AOO issues mailing list oooqa

 Reported: 2006-01-15 20:09 UTC by zirneklitis 2013-02-07 22:42 UTC (History) 4 users (show) discoleo issues lapsap7+ooo lars_o_hansen ENHANCEMENT --- ---

Attachments
Example of formula with labeled arrow (441 bytes, image/png)
2006-01-15 20:10 UTC, zirneklitis
no flags Details
Desired labeled arrows (230 bytes, image/png)
2006-01-15 20:11 UTC, zirneklitis
no flags Details

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 zirneklitis 2006-01-15 20:09:31 UTC There is no possibility to create labeled arrows in Math. In some formulas it's more then welcome feature. See example "labeled_arrow.png". The desired placement of labels and arrows can be seen in example "labeled_arrows.png" zirneklitis 2006-01-15 20:10:53 UTC Created Example of formula with labeled arrow zirneklitis 2006-01-15 20:11:27 UTC Created Desired labeled arrows lars 2006-01-15 22:25:05 UTC according to http://qa.openoffice.org/issue_handling/workflowcharts/ RFE_issues_by_QA.sxd I reassign this issue to requirements and set the status to New discoleo 2007-08-12 17:11:52 UTC Labeled arrows are indeed extensively used in chemistry. I will add here some signs often used in *chemistry*: 1. Equilibrium: (aka double half arrows for chemical equilibrium) simple: dual arrowheads: A <----> B complete: k1 _____________\ Start ------------- Product \ k2 where k1, k2 are the equilibrium constants (are omitted sometimes) 2. Reaction progression: one of the reaction less likely / unlikely k1 _____________\ Start -------- Product \ k2 especially k2 is omitted See e.g. on wikipedia: http://en.wikipedia.org/wiki/Chemical_equilibrium (although the notations there are very basic, yet more than OOo can do) For another image with equilibrium constants, see: http://goldbook.iupac.org/SVG/C01480-1.png and http://goldbook.iupac.org/SVG/F02463.png This one uses --> arrows, but half arrows (---`) are also common and sometimes preferred. 3. Broken arrows: (I did NOT find them) ---X--->, ---//--->, ---/---> and the double arrow versions Well, TEX has a wide range of useful additions that are currently lacking in OOo. Just to extend the arrows-issue in chemistry, I append some TEX-elements Table 132: chemarrow Extensible Accents \autoleftarrow{abc}{def} \autorightarrow{abc}{def} \autoleftrightharpoons{abc}{def} \autorightleftharpoons{abc}{def} These symbols are all â€œreverse accentsâ€ in that the two arguments serve, respectively, as a superscript and a subscript to the arrows. In addition to the symbols shown above, chemarrow also provides \larrowfill, \rarrowfill, \leftrightharpoonsfill, and \rightleftharpoonsfill macros. For an extended list of TEX-symbols, see http://www.ctan.org/tex-archive/info/symbols/comprehensive/symbols-a4.pdf. I already added these comments to issue 80616, although that issue should probably handle different things. lapsap7+ooo 2011-06-13 13:54:57 UTC To annotate arrows, you could use csup and csub. At least, in OOO 3.3 Math, this is possible. Example: rightarrow csup{abc} However, the current problem is that the arrow is not elongated to adjust itself to the width of center superscript or subscript contents. There are two (ugly) workarounds: 1. Construct your own (broken) arrow from Unicode characters: ― U+2015 for horizontal line → U+2192 for right arrow Example: X "―→" csup{abc} csub{ijk} Y use as many horizontal line chars as necessary! 2. Go to Wikipedia's sandbox (http://en.wikipedia.org/wiki/Wikipedia:Sandbox), edit the page, type in [itex] \xrightarrow{abc} [/itex] and show the preview. Wikipedia will then generate a temporary png image for the math formula that you could save and use in the document :-/ But you'd better save the Wiki math expression somewhere if you want to "modify" it later and you don't have to type everywhere from zero. lapsap7+ooo 2011-06-13 13:58:30 UTC Off-topic: For other possibilities in Wikipedia, the URL is http://en.wikipedia.org/wiki/Help:Displaying_a_formula