[R] par("uin") ?

[Paul Murrell]

Hi

Also see the xinch() and yinch() functions.

Paul

On 20/07/2010 10:44 a.m., Peter Ehlers wrote:
> Michael,
> I have a very old version of some brace functions somewhere.
> I never did combine them into a single function, so there's
> one each for left/right/up/down braces. (I used them in
> teaching regression to show resids and formulae.)
>
> If you're interested, I'll dig 'em up and send them.
>
> Otherwise, I think you can make your inherited code work
> with something like
>
> Usr<- par('usr')
> Pin<- par('pin')
> dux<- Usr[2] - Usr[1]
> duy<- Usr[4] - Usr[3]
> uin<- c(dux,duy)/Pin
>
> to replace
>
>    uin<- par("uin")
>
> But you'll also have to fiddle with atan()
>
>     -Peter Ehlers
>
> On 2010-07-19 9:20, Michael Friendly wrote:
>> I inherited a function written either for an older version of R or SPlus
>> to draw a brace, "{", in a graph. It uses par("uin") to determine the
>> scaling of the
>> quarter circles that make up segments of the brace, but that setting
>> doesn't
>> exist in current R.
>> I'm guessing that, in the function below, ux, uy can be defined from
>> par("usr") and par("pin"), but maybe someone remembers what par("uin")
>> was supposed to refer to.
>>
>> brace<- function (x1 = 0, y1 = 0, x2 = 0, y2 = 1, right = TRUE, rad = 0.2)
>> {
>> uin<- par("uin")
>> ux<- uin[1]
>> uy<- uin[2]
>> dx<- x2 - x1
>> dy<- y2 - y1
>> alpha<- atan(ux * dx, uy * dy)
>> scale<- sqrt((ux * dx)^2 + (uy * dy)^2)
>> if (scale>  5 * rad)
>> rad<- rad/scale
>> qcirc<- cbind(cos((0:10) * pi/20), sin((0:10) * pi/20))
>> qcircr<- cbind(cos((10:0) * pi/20), sin((10:0) * pi/20))
>> rot<- function(theta) t(cbind(c(cos(theta), sin(theta)),
>> c(-sin(theta), cos(theta))))
>> seg1<- t(t(rad * qcirc %*% rot(-pi/2)) + c(0, rad))
>> seg4<- t(t(rad * qcirc) + c(0, 1 - rad))
>> seg3<- t(t((rad * qcircr) %*% rot(pi)) + c(2 * rad, 0.5 +
>> rad))
>> seg2<- t(t((rad * qcircr) %*% rot(pi/2)) + c(2 * rad, 0.5 -
>> rad))
>> bra<- rbind(seg1, seg2, seg3, seg4)
>> if (!right)
>> bra<- bra %*% diag(c(-1, 1))
>> bra<- scale * bra %*% rot(-alpha)
>> bra<- bra %*% diag(c(1/ux, 1/uy))
>> bra<- t(t(bra) + c(x1, y1))
>> bra
>> }
>>
>
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-- 
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
paul at stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/