pcolor and "interp" [changeset-2]

[Kai Habel]

Ben Abbott schrieb:
>
> On Oct 1, 2008, at 8:42 PM, Ben Abbott wrote:
>
>>
>> On Sep 30, 2008, at 4:53 PM, Ben Abbott wrote:
>>
>>> On Tuesday, September 30, 2008, at 04:40PM, "Ben Abbott"
>>> <bpabbott at mac.com> wrote:
>>>> On Tuesday, September 30, 2008, at 04:32PM, "Kai Habel"
>>>> <kai.habel at gmx.de> wrote:
>>>>> John W. Eaton schrieb:
>>>>>> On 30-Sep-2008, Kai Habel wrote:
>>>>>>
>>>>>> | I would support interpolated surfaces only for gnuplot
>>>>>> 4.2.4+(5). In
>>>>>> | that case "illusions" esp. for pcolor are not required. Users
>>>>>> who really
>>>>>> | need interpolated surfaces can use the cvs version(s) of gnuplot.
>>>>>>
>>>>>> In that case, do we even need to check the gnuplot version here?
>>>>> I don't think so.
>>>>>> What
>>>>>> is the result if we do not?  Does gnuplot crash, or simply fail to
>>>>>> interpolate the colors?
>>>>> In my understanding it should just fail to interpolate, but I have
>>>>> not
>>>>> tried this for myself. Maybe, Ben has a complete overview?
>>>>
>>>> I'll need to rebuild my gnuplot without the patch applied and find
>>>> out.
>>>>
>>>> I'll get back to the list in a few hours.
>>>>
>>>> Ben
>>>
>>> Ok ... it only took a few minutes. My package manager still had the
>>> deb files or unpatched version :-)
>>>
>>> I think Kai is correct. If I disable the check the old version of
>>> gnuplot appear to produce the same results they always did. That
>>> seems more proper to me. I'll modify the changeset and run a "make
>>> check" and run some more demos. If all looks good I'll post the
>>> corrected one later tonight.
>>>
>>> Ben
>>
>> My prior changes have been checked in. The changeset needed to
>> implement the version suggested by Kai is attached.
>>
>> Ben
>
> Trying again. This time with the facecolor bug reported by Michael
> included.
>
Hello Ben,

the interpolation for surfaces works here pretty well. But I noticed one
gnuplot issue, related to the interpolation.

Try this:
h=pcolor(peaks(12));
set(h,'edgecolor','w');

If you now toggle between:
set(h,'facecolor','interp');
set(h,'facecolor','flat');
the white grid changes its  spacing, where it should not.

I don't think we can change this behavior easily. So, I would consider
this as minor problem and leave it as it is.

Kai