[GRASS-dev] fix to d.vect.thematic rendering [was: Re: added opacity option to grc file]

[Moritz Lennert]

Michael Barton wrote:
> OK. I DID find a clever way to fix this. At least I hope it is clever and
> fixes it (seems to with my system).
> 
> I use the -s flag (now more clearly labeled as using d.vect.thematic with
> GIS Manager) to cause d.vect.thematic to do the following
> 
> turn on PNG driver
> turn off autowrite
> turn off immediate mode rendering
> run d.vect interatively
> put things back the way they were.
> 
> Please check this.

Yep, d.vect.thematic is back where it should be. (Funny, I could have 
sworn that I had succesfully used it after the switch to direct 
rendering, but apparently I hadn't.)

Thanks,

Moritz


> 
> Michael
> __________________________________________
> Michael Barton, Professor of Anthropology
> School of Human Evolution & Social Change
> Center for Social Dynamics and Complexity
> Arizona State University
> 
> phone: 480-965-6213
> fax: 480-965-7671
> www: http://www.public.asu.edu/~cmbarton
> 
> 
>> From: Michael Barton <michael.barton at asu.edu>
>> Date: Mon, 11 Sep 2006 14:05:39 -0700
>> To: Moritz Lennert <mlennert at club.worldonline.be>
>> Cc: grass-dev <grass-dev at grass.itc.it>
>> Conversation: added opacity option to grc file
>> Subject: Re: added opacity option to grc file
>>
>> Moritz,
>>
>> Now that I finally got thematic mapping working on my Mac again, I was able to
>> look into this.
>>
>> I think switching to immediate mode rendering has broken thematic mapping from
>> the GUI. Looking at it, I'm not sure why it was working before.
>>
>> I'm pretty sure that what is happening is that the thematic mapping script is
>> iteratively running d.vect (actually this IS what is happening). Somehow, this
>> was getting written to a single output PPM that was then composited and
>> displayed with any other map in the layer tree. Perhaps this was happening
>> because of the lag in writing the output PPM allowed all the iterated d.vect
>> writes in the display driver to put it all together before it was output to a
>> file.
>>
>> With immediate mode rendering, the PPM output is considerably faster. So
>> d.vect.thematic is repeatedly writing it's vector displays (one for each
>> theme) to a file directly, rather than to the display driver and then to a
>> file. The unfortunate result is that it is writing each theme to the SAME
>> file, overwriting any previous theme. So you only see the last theme written.
>>
>> At the moment, I can't think of a clever way to fix this so that the script
>> works as a stand alone module and can write in  the old way to the display
>> driver, and at the same time work in the GUI environment. I'm loathe to
>> rewrite the whole thing in TclTk and then have to maintain 2 versions.
>>
>> Any suggestions are welcome. Glynn???
>>
>> Michael
>>
>> __________________________________________
>> Michael Barton, Professor of Anthropology
>> School of Human Evolution & Social Change
>> Center for Social Dynamics and Complexity
>> Arizona State University
>>
>> phone: 480-965-6213
>> fax: 480-965-7671
>> www: http://www.public.asu.edu/~cmbarton
>>
>>
>>> From: Moritz Lennert <mlennert at club.worldonline.be>
>>> Date: Mon, 11 Sep 2006 17:14:44 +0200
>>> To: Michael Barton <michael.barton at asu.edu>
>>> Subject: Re: added opacity option to grc file
>>>
>>> I have another problem which is also new: it seems as if the thematic
>>> layer only displays the highest (last) class. Below you see the messages
>>> in the output window. Nothing seems to be going wrong, but in the
>>> display I only see those areas which are in the range 4152.66 - 20174.
>>>
>>> Moritz
>>>
>>> ******output**************
>>>
>>> Thematic map legend for column densite of map communes
>>>
>>> Value range:  0 -  20174
>>> Mapped by standard deviation units of  1747.52 (mean = 657.62)
>>>
>>> Color(R:G:B) Value
>>> ============ ==========
>>> 0:0:255  0 - 657.62
>>> PNG: GRASS_TRUECOLOR status: TRUE
>>> PNG: collecting to file:
>>> /home/mlennert/GRASS/DATA/BELGIQUE/mlennert/.tmp/geog-pc40/32172.0.ppm,
>>>       GRASS_WIDTH=642, GRASS_HEIGHT=482
>>>
>>> 'vector/communes' was found in more mapsets (also found in mlennert).
>>> 85:0:170  657.62 - 2405.14 +1sd
>>> PNG: GRASS_TRUECOLOR status: TRUE
>>> PNG: collecting to file:
>>> /home/mlennert/GRASS/DATA/BELGIQUE/mlennert/.tmp/geog-pc40/32172.0.ppm,
>>>       GRASS_WIDTH=642, GRASS_HEIGHT=482
>>>
>>> 'vector/communes' was found in more mapsets (also found in mlennert).
>>> 170:0:85  2405.14 - 4152.66 +2sd
>>> PNG: GRASS_TRUECOLOR status: TRUE
>>> PNG: collecting to file:
>>> /home/mlennert/GRASS/DATA/BELGIQUE/mlennert/.tmp/geog-pc40/32172.0.ppm,
>>>       GRASS_WIDTH=642, GRASS_HEIGHT=482
>>>
>>> 'vector/communes' was found in more mapsets (also found in mlennert).
>>> 255:0:0  4152.66 - 20174
>>> PNG: GRASS_TRUECOLOR status: TRUE
>>> PNG: collecting to file:
>>> /home/mlennert/GRASS/DATA/BELGIQUE/mlennert/.tmp/geog-pc40/32172.0.ppm,
>>>       GRASS_WIDTH=642, GRASS_HEIGHT=482
>>>
>>> 'vector/communes' was found in more mapsets (also found in mlennert).
>>>
>