Framing and circling

??=[entries.framing] You can put a box around an entry in a diagram by inserting the || command anywhere in the entry; if you prepend a TEX dimension in |<>|s then the box will have rounded corners with radius as the TEX dimension. There is also || that does the same but makes a double box. Here are some examples:

$\displaystyle \spreaddiagramrows$-1pc$\displaystyle \spreaddiagramcolumns$-1pc$\displaystyle \diagram$|$\displaystyle \framed$|$\displaystyle \framed$ & |$\displaystyle \Framed$|$\displaystyle \Framed$
|$\displaystyle \framed$ < 5pt > |$\displaystyle \framed$ < 5pt > & $\displaystyle \Text$|$\displaystyle \Framed$ < 100pt > |
(withmaximum) $\displaystyle \Framed$ < 100pt > $\displaystyle \diagram$

As you can see, the radius is scaled down to be useable; furthermore none of these commands are guaranteed to produce curves with a radius of more than 40pt.
In "v3" many more frames are available.

In case you want `perfect' circles there are || and || commands that will just use half the width of the current entry as their outer radius unless an explicit radius is given in |<>|s. They should be used with ||; ,
\begin{code} \spreaddiagramrows{-1pc} \diagram \rto^>(.5){\text{start}} & \squ... ...\lq r+U \lq [lll]^b \lq [lll] [lll] \xto \lq r+D \lq [ll] _a \lq [ll] [ll] \enddiagram \end{code}
will typeset

$\displaystyle \NoCompileAllDiagrams$$\displaystyle \docode$

Many more frames types are described in the reference manual [#!R94:XY-picRM!#].
In "v3" objects can be truly round.