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| − | == mathstackers ==
| + | moved to [[Math/stackers]] |
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| − | ConTeXt has a nice structure called {{code|1=mathstackers}} in order to define new math commands in which some characters are stacked over another one. For more information refer to {{src|math-stc.mkiv}}.
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| − | The two command {{code|1=\mathover[symbol]{}{}}} and {{code|\mathunder[symbol]{}{}}} are built and can be used directly. However one may define one's own commands.
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| − | A typical example is when you want to put a small circle on top of a letter (as one would when defining the topological interior of a set…).
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| − | To do so we define first a new stacker named here {{code|1=MySymbol}}, and then invoking that with {{code|1=\definemathover}} we define two new commands {{code|1=\interior}} and {{code|1=\mystarred}} which can be used in math mode.
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| − | <texcode>
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| − | \definemathstackers[MySymbol]
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| − | [voffset=-.3\mathexheight,
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| − | hoffset=\zeropoint,
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| − | mathclass=ord,
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| − | topoffset=.4\mathemwidth, % poor man's italic correction
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| − | middlecommand=\mathematics]
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| − | \definemathover[MySymbol][interior]["2218] %this a small circle
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| − | \definemathover[MySymbol][mystarred]["2717] % this is an asterisk
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| − | \starttext
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| − | Here is the new command \type{\interior{K}}: $\interior{K}$. Compare this to \type{\mathring{K}}: $\mathring{K}$.
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| − | Here is the new command \type{\mystarred{K}}: $\mystarred{K}$.
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| − | Here are the built-in commands \type{\mathover} and \type{\mathunder}:
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| − | $\mathover[symbol]{"2217}{A}$, % 2217 is a circle
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| − | $\mathover[symbol]{"2218}{A}$, % 2218 is an asterisk
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| − | $\mathover[symbol]{"2219}{A}$, % 2219 is a bullet
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| − | $\mathunder[symbol]{"2217}{A}$,
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| − | $\mathunder[symbol]{"2218}{A}$,
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| − | $\mathunder[symbol]{"2219}{A}$.
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| − | \stoptext
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| − | </texcode>
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| − | When typeset in {{code|1=mkiv}} one can see that the command {{code|1=\interior{K}}} shows the letter K with a small circle above it.
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