gnuplot-beta

Oddities with the new contour labels feature

[Juhász P. <pet...@gm...>]

Dear list,

I've tested the new contour labels feature, and I found a few problems.

First, when I just say

splot x**2+y**2

the program replies with 'warning: This plot style is only for
datafiles , reverting to "points"'. 
Something like 'You must use "set contours" first to use this feature'
would be more helpful.

Let's enable it:

set contour
set view map

Then the real strange thing:

splot x**2+y**2, x**2+y**2 w labels
splot x**2+y**2 w labels, x**2+y**2

The two are not equivalent: the second one puts the legend for the
contours at the right edge of the canvas.

When using pm3d:

splot x**2+y**2 w labels , x**2+y**2 w pm3d

The pm3d surface hides the labels. Which is logical, come to think of
it, but it confused me for a second.


'show cntrlabel' does not work.


Labels are not displayed if contours are drawn at the surface, not at
the bottom. At least a warning should be issued in this case if this is 
intentional.


Otherwise, it is a good thing to have, one that was on top of the
wishlist for many, I'm sure.

Peter Juhasz

ps. I'm sorry for not being active on gnuplot lately, it's just that in
my current job I don't use it too much anymore, and with all the work to
do I don't have the incentive to hack on gnuplot.

Re: Oddities with the new contour labels feature

[sfeam (E. Merritt) <eam...@gm...>]

On Saturday, 18 May 2013, Juhász Péter wrote:
> Dear list,
> 
> I've tested the new contour labels feature, and I found a few problems.
> 
> First, when I just say
> 
> splot x**2+y**2
> 
> the program replies with 'warning: This plot style is only for
> datafiles , reverting to "points"'. 

I take it you mean 
   splot x**2+y**2 with labels?
The program always done that.  But you're right that it would now
be more informative to issue a comment about contours and
_not_ revert to points.

> Something like 'You must use "set contours" first to use this feature'
> would be more helpful.
> 
> Let's enable it:
> 
> set contour
> set view map
> 
> Then the real strange thing:
> 
> splot x**2+y**2, x**2+y**2 w labels
> splot x**2+y**2 w labels, x**2+y**2
> 
> The two are not equivalent: the second one puts the legend for the
> contours at the right edge of the canvas.

Dang. I thought I fixed that bug.  The problem is that it is writing
blank title lines in the key for each contour level.  If the blank lines
come last you don't notice them, but if they come first then all the
non-blank lines are shifted to later in the key.   It's a trivial fix, 
I must have lost it somewhere.

Thanks for testing.  I'll take a look at the other issues as well.

	Ethan

> When using pm3d:
> 
> splot x**2+y**2 w labels , x**2+y**2 w pm3d
> 
> The pm3d surface hides the labels. Which is logical, come to think of
> it, but it confused me for a second.
> 
> 'show cntrlabel' does not work.
> 
> 
> Labels are not displayed if contours are drawn at the surface, not at
> the bottom. At least a warning should be issued in this case if this is 
> intentional.
> 
> 
> Otherwise, it is a good thing to have, one that was on top of the
> wishlist for many, I'm sure.
> 
> Peter Juhasz
> 
> ps. I'm sorry for not being active on gnuplot lately, it's just that in
> my current job I don't use it too much anymore, and with all the work to
> do I don't have the incentive to hack on gnuplot.
> 
> 
> 
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