Description of the "self object"

[Henrik]

In the source code of ggplot, it is often refered to a "self object" and different slots therein. For example, in scale-.r we find, among others, self$get_limits(), self$breaks, self$break_positions(). "self" is mentioned in  ?ggroto, but I fail to find information about the slots the way they are used in the ggplot code.

Can someone please point me to relevant documentation of "self" and its different slots.  

[Brian]

Hi Henrik,
As you probably know you are looking at reference class R code:

http://adv-r.had.co.nz/R5.html

I remember Hadley mentioning a new object orientation class used for the last (2.0?) ggplot2 release. If true and undocumented, I guess the "self" refers to containing object (Class) - as it does in python. Otherwise this is inherent to the reference class.

HTH,
Brian

[Henrik]

Hi Brian!

Thank you for your rapid reply. My first attempt to find the slots used in self was to look at str(myplot) and ggplot_build(myplot), without success. They must be hidden deeper down (or further sideways...) than I have dug so far. Or I might have misunderstood the R5 concept entirely...

Cheers

[Ista Zahn]

There is some documentation at http://docs.ggplot2.org/current/vignettes/extending-ggplot2.html, but presumably self is used to refer to an object from inside one of its methods.

Best,
Ista

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[Brian]

Hi Henrik,

who knows where you are at in programming knowledge and what you exactly
want to do. I have a feeling that Ista's tip is the right one - you want
to extend ggplot2. If you are familiar with OO-languages, e.g. python,
then R5 is a breeze. Otherwise, it can be intimidating at first. I
suggest starting with some documentation. Then digging/tunneling won't
be confusing.

Slots belong to S4. In R5, "fields are the equivalent of slots in S4."

Good luck,
Brian

On 09/29/2016 01:20 PM, Ista Zahn wrote:
> There is some documentation at
> http://docs.ggplot2.org/current/vignettes/extending-ggplot2.html, but
> presumably self is used to refer to an object from inside one of its
> methods.
>
> Best,
> Ista
>
>
> On Sep 29, 2016 5:31 AM, "Henrik" <henri...@gmail.com

> <mailto:henri...@gmail.com>> wrote:
>
> Hi Brian!
>
> Thank you for your rapid reply. My first attempt to find the slots
> used in self was to look at str(myplot) and ggplot_build(myplot),
> without success. They must be hidden deeper down (or further
> sideways...) than I have dug so far. Or I might have misunderstood
> the R5 concept entirely...
>
> Cheers
>
>
> On Tuesday, September 27, 2016 at 11:25:34 AM UTC+2, zenlines wrote:
>
> Hi Henrik,
> As you probably know you are looking at reference class R code:
>
> http://adv-r.had.co.nz/R5.html
>
> I remember Hadley mentioning a new object orientation class used
> for the last (2.0?) ggplot2 release. If true and undocumented, I
> guess the "self" refers to containing object (Class) - as it
> does in python. Otherwise this is inherent to the reference class.
>
> HTH,
> Brian
>
>
> El 27 de septiembre de 2016 8:52:41 AM GMT+02:00, Henrik
> <henri...@gmail.com> escribió:
>
> In the source code of ggplot, it is often refered to a "self
> object" and different slots therein. For example,
> in scale-.r

> <https://github.com/hadley/ggplot2/blob/master/R/scale-.r> we find,

> among others, self$get_limits(), self$breaks,
> self$break_positions(). "self" is mentioned in ?ggroto, but
> I fail to find information about the slots the way they are
> used in the ggplot code.
>
> Can someone please point me to relevant documentation of
> "self" and its different slots.
>
> --
> --
> You received this message because you are subscribed to the ggplot2
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> Please provide a reproducible example:
> https://github.com/hadley/devtools/wiki/Reproducibility
> <https://github.com/hadley/devtools/wiki/Reproducibility>
>
> To post: email ggp...@googlegroups.com

> <mailto:ggp...@googlegroups.com>
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>
> --
> --
> You received this message because you are subscribed to the ggplot2
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>
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