Re: set border polar with 5.2 RC1

[sfeam <sf...@us...>]

On Wednesday, 07 June 2017 10:59:39 PM Christoph Bersch wrote:
> Hi,
> 
> I'm testing a bit the new features in 5.2 RC1. I had some problems with 
> `set border polar`
> 
> Consider the following script:
> 
> reset
> set polar
> set grid polar lw 2
> unset xtics
> unset ytics
> set size square
> unset key
> # set rrange [0:6.5]
> set border 0 polar
> plot t lt 3 lw 2, -t lt 4 lw 2
> 
> * That one doesn't plot a polar border, only when an explicit rrange is 
> set (uncomment the set rrange line).

The polar border is only drawn if there is an explicit rrange (not autoscaled).
The lack of a border for auto-scaled plots now seems like a bug to me,
although from the code it apparently was intentional.
I honestly cannot remember what was the reason for that.

> * The polar border overlaps with the outer grid circle

Yes.  That seemed like the only well-defined place to draw it,
but I'm open to other suggestions.

I suppose there could be an entirely separate command
"set polar border at <r value>", but in general how would you
know in advance what to set it to?

> * Another observation is, that the polar grid is not clipped at the 
> original square border (like it is done in 5.0), but drawn until the 
> canvas border.

That is definitely intentional.  Clipping off the "corners" of a circle looks
really strange.

It would be nice if you could clip lines to RMAX instead, but the existing
clipping code is not designed for this.  It's on my long-term wishlist to
find an efficient way to do radial clipping.

	Ethan

> Thank you,
> Christoph