[R] scalable < > delimiters in plotmath

[baptiste auguie]

I see, thanks. Looking at this table I guess the short answer is no,
these cannot be made to scale and the only ones that could have
already been implemented in bgroup().

Thanks,

baptiste


On 12 September 2010 22:11, Paul Murrell <p.murrell at auckland.ac.nz> wrote:
> Hi
>
> On 13/09/2010 7:57 a.m., baptiste auguie wrote:
>>
>> Oh, right I see. I was completely off then. Maybe it's not so easy to
>> add<>  delimiters after all, I'll have to look at the list of symbol
>> pieces to see if these can be constructed too.
>
> The plotmath stuff assumes a font with an Adobe Symbol encoding.  The
> characters we have to play with are shown at
> http://www.stat.auckland.ac.nz/~paul/R/CM/AdobeSym.pdf.
> You can see the components of "growable" delimiters on the bottom two rows.
>
> Paul
>
>> Thanks,
>>
>> baptiste
>>
>> On 12 September 2010 21:42, David Winsemius<dwinsemius at comcast.net>
>>  wrote:
>>>
>>> On Sep 12, 2010, at 6:15 AM, baptiste auguie wrote:
>>>
>>>> Thanks everyone. I've also had a look at plotmath.c where bgroup is
>>>> defined for "[", "{", "(", "." but not "<". It seems quite trivial to
>>>> add it, at first sight, however there is a part that I don't
>>>> understand in the RenderDelim routine,
>>>>
>>>> static BBOX RenderDelim(int which, double dist, int draw, mathContext
>>>> *mc,
>>>>                        pGEcontext gc, pGEDevDesc dd)
>>>> {
>>>>
>>>> // [... snipped ...]
>>>>
>>>>   case '(':
>>>>        top = 230; ext = 231; bot = 232; mid = 0;
>>>>        break;
>>>>   case ')':
>>>>        top = 246; ext = 247; bot = 248; mid = 0;
>>>>        break;
>>>>
>>>> These integer codes make no sense to me, I have no clue which ones I
>>>> should use for<  and>.
>>>
>>> Does this help? (I think they are using Symbol PS fonts with decimal
>>> indexing.)
>>>
>>>> as.octmode(c(230, 231, 232, 246, 247, 248) )
>>>
>>> [1] "346" "347" "350" "366" "367" "370"
>>>  plot(1,1, xlab= expression(
>>> symbol("\346")~    # upper 1/3 of left paren
>>> symbol("\347")~    # to left of center bar
>>> symbol("\350")~    # lower 1/3 of left paren
>>>
>>> symbol("\366")~    # upper 1/3 of right paren
>>> symbol("\367")~    # to right of center bar
>>> symbol("\370") ) ) # lower 1/3 of right paren
>>>
>>> (caveat: Maybe not standard glyph-names.)
>>>
>>> I added octal annotation to the TestChars(font=5) call that the points
>>> help
>>> page offers:
>>>
>>> TestChars(font=5)
>>> for(j in 1:14) {
>>>    for(i in 0:16){
>>>        text(i+0.2, j+.6, labels=as.octmode(i+(j+1)*16), cex=.5)}}
>>>
>>> I do not see a trio or pair of glyphs that would form an angle bracket.
>>>
>>> --
>>>
>>> David.
>>>
>>>
>>>> As far as I understand these codes might
>>>> correspond to extended ascii characters whose boundaries and positions
>>>> we want to borrow. Then again, maybe it's something else entirely.
>>>>
>>>> Any hints?
>>>>
>>>> Best wishes,
>>>>
>>>> baptiste
>>>>
>>>>
>>>>
>>>>
>>>> On 12 September 2010 03:27, David Winsemius<dwinsemius at comcast.net>
>>>> wrote:
>>>>>
>>>>> On Sep 11, 2010, at 9:00 PM, Peter Ehlers wrote:
>>>>>
>>>>>> On 2010-09-11 16:14, Dennis Murphy wrote:
>>>>>>>
>>>>>>> Hi Baptiste,
>>>>>>>
>>>>>>> You need to use the symbol("\nnn") concept, where nnn denotes the
>>>>>>> octal
>>>>>>> symbol number. For<    it's 074 and for>    it's 076. This little
>>>>>>> test
>>>>>>> seemed
>>>>>>> to
>>>>>>> work:
>>>>>>>
>>>>>>> plot(1, 1, main = expression(symbol("\074")~'x, y'~symbol("\076")))
>>>>>>>
>>>>>>> HTH,
>>>>>>> Dennis
>>>>>>
>>>>>> It's a matter of taste, but I would use "\341" and "\361".
>>>>>> However, these are still not scalable, AFAICS.
>>>>>
>>>>> Not exactly scalable angles, but you can fake it:
>>>>>
>>>>> plot(1, 1, main = expression(symbol("\341")~scriptstyle( atop(x,y)
>>>>> )~symbol("\361")), cex.main=3)
>>>>>
>>>>> scriptstyle shrinks the inner atop() material, and since I tested on a
>>>>> Mac
>>>>> it should work for Baptiste.
>>>>>
>>>>> --
>>>>> David.
>>>>>>
>>>>>>  -Peter Ehlers
>>>>>>
>>>>>>>
>>>>>>> On Sat, Sep 11, 2010 at 10:01 AM, baptiste auguie<
>>>>>>> baptiste.auguie at googlemail.com>    wrote:
>>>>>>>
>>>>>>>> What do people use to show angle brackets<    >    in R graphics?
>>>>>>>> Have I
>>>>>>>> missed something obvious?
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>>
>>>>>>>> baptiste
>>>>>>>>
>>>>>>>> On 9 September 2010 17:57, baptiste auguie
>>>>>>>> <baptiste.auguie at googlemail.com>    wrote:
>>>>>>>>>
>>>>>>>>> Dear list,
>>>>>>>>>
>>>>>>>>> I read in ?plotmath that I can use bgroup to draw scalable
>>>>>>>>> delimiters
>>>>>>>>> such as [ ] and ( ). The same technique fails with<    >
>>>>>>>>>  however, and
>>>>>>>>> I
>>>>>>>>> cannot find a workaround,
>>>>>>>>>
>>>>>>>>> grid.text(expression(bgroup("<",atop(x,y),">")))
>>>>>>>>>
>>>>>>>>> Error in bgroup("<", atop(x, y),">") : invalid group delimiter
>>>>>>>>>
>>>>>>>>> Regards,
>>>>>>>>>
>>>>>>>>> baptiste
>>>>>>>>>
>>>>>>>>> sessionInfo()
>>>>>>>>> R version 2.11.1 (2010-05-31)
>>>>>>>>> x86_64-apple-darwin9.8.0
>>>>>
>>>>> David Winsemius, MD
>>>>> West Hartford, CT
>>>
>>>
>>>
>>
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>
> --
> Dr Paul Murrell
> Department of Statistics
> The University of Auckland
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