[Scilab-users] polarplot improvements (pre-SEP) <= Re: Polarplot help

[Claus Futtrup]

Hi Samuel

It looks like excellent work. I checked my polar plot and the labels are
indeed a little bit off (mostly visible with 3-digit numbers, i.e. 120,
150, 180 and so on degrees). It works OK for now. I think your upgraded
polarplot should go into the main tree - the plots as seen on the picture
you included looks excellent.

If overplotting could be fixed, that would also be very nice.

P.S. it reminds me that Scilab 6 was released about a year ago. Normally
such a first release with such big changes will require some bug fixing,
but surprisingly this seems not to be the case. Impressive how well 6.0.0
was executed (and it also took a couple of years ...). I could not execute
my latest script (with the polar and contour plots) in Scilab 5 -- it ran
out of memory.

I wonder if anyone can say what's up in regard to Scilab releases?

Best regards,
Claus


On Sun, Jan 21, 2018 at 9:41 PM, Samuel Gougeon <sgougeon at free.fr> wrote:

> Hello Clauss,
>
> After a first polarplot upgrade in 2010, i started writting some other
> improvements in 2016, first about still improving angular and radial labels
> positionning. Yesterday, i took the opportunity of your message to post on
> the CodeReview the polarplot.sci in progress, and to go on a bit, mainly
> about proper labels for polar datatips.
> You can already use the scripts as is: https://codereview.scilab.org/
> #/c/19684/
> Just click on the polarplot.sci link, and then you may download it, or
> copy/past the content.
>
> The trick with gca().rotation_angles reminded y Rafael is well known, but
> due to labels uncentered on their anchor, using it currently shifts labels
> (see the screenshot below). This is fixed in the CodeReview version.
>
> If you want to be fully back-compatible with this new polarplot.sci, you
> should simply comment lines
> performing some glue(). This won't prevent other improvements working.
>
> Other improvements can be proposed, as listed in the review header:
>
>    - DONE:
>       - centering of angular labels: Already allows shifting the 0°
>       position and the angular direction (clockwise/trigo), using
>       gca().rotation_angles
>       - Optimized positionning of radial labels
>       - Glue into 4 compounds lines of the radial frame lines of the
>       circular frame angular labels radial labels (not backcompatible => To be
>       discussed carefully).
>       - polarplot() canceled external drawlater(): FIXED
>       - Datatips: implement a convenient default display function
>       - WIP:
>       - Scilab Enhancement Proposal
>       - http://bugzilla.scilab.org/5907: enable overplotting
>       - http://bugzilla.scilab.org/5693: page to be overhauled
>    - TO BE ANALYZED
>       - Angular labels with a rect box disappear or are unclipped over
>       neighbouting axes.
>       - Enable specifying major values for the radial and angular frame
>       (to be analyzed)
>       - Enable radial logarithmic scale
>       - Extend replot() to polar plots
>
> This may be seen as a "pre-SEP" :). A proper SEP will be required. To come.
>
> In my opinion, the trick with gca().rotation_angles is not fully
> convenient because
>
>    - it may switch xlabel() and ylabel() positions, what could be
>    disturbing
>    - radial labels can be turned displayed along a row, what must be
>    avoided to avoid overlays when labels are quite long.
>
> So, the final implementation won't use this trick.
>
> Later, with a priority clearly lower, the same job shall be done for
> graypolarplot().
>
> Cheers
> Samuel
>
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>
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