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MathML:Stretchy: Difference between revisions
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== | == [DONE] Scale stretchy == | ||
For various reasons, stretching may be imperfect: the user's system lacks mathematical fonts, we do not support yet the stretching for a particular char or we do not have a glyph of suitable size. Using a scale transform {{bug|414277}} would allow to workaround the issue of non-stretched characters and improve the accuracy of stretching. Note that as in TeX, an imperfect stretching causes issues such as | |||
[http://www.mozilla.org/projects/mathml/screenshots/ex31.gif radical symbols not touching the base]. | |||
== [DONE] Embellished operators == | |||
There are specific stretchy rules for [http://www.w3.org/TR/MathML3/chapter3.html#id.3.2.5.7.3 embellished operators] that should be implemented. The remaining elements that we do not treat as embellished operators are: | |||
* first element of a semantics | |||
* mstyle, mphantom, or mpadded used as mrow. | |||
* mrow whose arguments consist (in any order) of one embellished operator and zero or more space-like elements. | |||
See {{bug|21479}}. | |||
[http://www. | |||
== Operator dictionary and heuristic rules for the operator form == | |||
Many operator properties affecting stretching are provided by the MathML Operator Dictionary. We should upgrade our dictionary to [http://www.w3.org/TR/MathML3/appendixc.html the one given in MathML3], where a lot of new entries are added and several properties modified. | |||
= | [edit] Most entries have been upgraded in {{bug|534970}}. The [https://bugzilla.mozilla.org/show_bug.cgi?id=534970#c66 remaining differences] are for some diagonal arrows and bars. | ||
Also, the form infix/postfix/prefix is used to determine the properties of an operator. We should implement the [http://www.w3.org/TR/MathML3/chapter3.html#presm.formdefval heuristic rules to better determine the form] of an operator (see {{bug|562460}}). | |||
== Stretching in mtable cells == | == Stretching in mtable cells == | ||
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See {{bug|236963}} | See {{bug|236963}} | ||
== | == Diagonal direction == | ||
The MathML spec mentions diagonal arrows as an example of characters that stretch both in vertical and horizontal directions. We already support stretching of horizontal/vertical arrows using a composite char. The idea of {{bug|552290}} is to apply a rotation on this composite char to implement diagonal direction. We should add direction:updiagonal and direction:downdiagonal in our operator dictionary to distinguish this diagonal stretching. If we want a general mechanism, an attribute like basechar:\UNNNN should also be added to indicate on which char we should apply the rotation (i.e. a horizontal arrow in our case). | |||
== Other bugs == | |||
See {{bug|442209}}, {{bug|585347}}, {{bug|666754}}, {{bug|687751}}, {{bug|687807}} | |||
See {{bug|442209}} | |||