[GRASS-dev] Re: added opacity option to grc file

[Michael Barton]

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.

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).
>>