[GRASS-user] How to define the png image dimensions when using d.mon?

Vinay_Elothunkal · March 9, 2016, 4:10am

Hi jean pierre huart,

I have exported png image using module “d.out.file”,(I have pasted a part of the script below which I have used. I hope this will help you…
…

import grass.script as g
import os
import shutil
import time

g.run_command(‘r.colors’,map=str(i),rules=‘color_table.txt’)
g.start_command(‘d.mon’, start=‘wx1’)
time.sleep(10)
g.run_command(‘d.rast’, map=str(i))
time.sleep(10)
g.run_command(‘d.vect’, map=str(i))
time.sleep(40)
g.run_command(‘d.out.file’,output=str(i),format=‘png’,size=(2403,2403))
time.sleep(10)
g.run_command(‘d.mon’, stop=‘wx1’)
time.sleep(10)
…

Regards,
Vinay

···

How to define the png image dimensions when using d.mon?
(jean pierre huart)

Re: How to define the png image dimensions when using d.mon?
(jean pierre huart)

Message: 1
Date: Tue, 8 Mar 2016 16:15:01 +0100
From: jean pierre huart <jph@openjph.be>
To: grass-user@lists.osgeo.org
Subject: [GRASS-user] How to define the png image dimensions when
using d.mon?
Message-ID: <56DEEC75.5030709@openjph.be>
Content-Type: text/plain; charset=iso-8859-15; format=flowed

Hello,

I’ve written a python script to generate an image combining a vector map
(myvector) and a raster (myraster) that has been generated using a mask.
It works great by default and creates an image with the default
dimensions 640x480 on a white background.

gscript.run_command(‘d.mon’, overwrite=True, start=‘png’,
output=filename)
gscript.run_command(‘d.rast’, map=‘{0}@{1}’.format(myraster,
self.mapset))
gscript.run_command(‘d.vect’, map=‘{0}@{1}’.format(myvector,
self.mapset), color=‘white’, fill_color=‘none’)
gscript.run_command(‘d.mon’, stop=“png”)

I would like to have a transparent background and to change the
dimensions of the image to 1280x960.
Reading the documentation I had the impression that I just have to
modify some variables, but it does not work.

os.environ[‘GRASS_TRANSPARENT’] = ‘TRUE’
os.environ[‘GRASS_WIDTH’] = str(1280)
os.environ[‘GRASS_HEIGHT’] = str(960)
gscript.run_command(‘d.mon’, overwrite=True, start=‘png’,
output=filename)
gscript.run_command(‘d.rast’, map=‘{0}@{1}’.format(myraster,
self.mapset))
gscript.run_command(‘d.vect’, map=‘{0}@{1}’.format(myvector,
self.mapset), color=‘white’, fill_color=‘none’)
gscript.run_command(‘d.mon’, stop=“png”)

Thanks in advance for any advice.
Ciao

–
Jean Pierre Huart

Message: 2
Date: Tue, 8 Mar 2016 16:28:35 +0100
From: jean pierre huart <jph@openjph.be>
To: grass-user@lists.osgeo.org
Subject: Re: [GRASS-user] How to define the png image dimensions when
using d.mon?
Message-ID: <56DEEFA3.2050007@openjph.be>
Content-Type: text/plain; charset=utf-8; format=flowed

Sorry I’ve forgotten to precise that I’m using Grass v7.0.3 on ubuntu 14.04.

On 08/03/16 16:15, jean pierre huart wrote:

Hello,

I’ve written a python script to generate an image combining a vector
map (myvector) and a raster (myraster) that has been generated using a
mask.
It works great by default and creates an image with the default
dimensions 640x480 on a white background.

gscript.run_command(‘d.mon’, overwrite=True, start=‘png’,
output=filename)
gscript.run_command(‘d.rast’, map=‘{0}@{1}’.format(myraster,
self.mapset))
gscript.run_command(‘d.vect’, map=‘{0}@{1}’.format(myvector,
self.mapset), color=‘white’, fill_color=‘none’)
gscript.run_command(‘d.mon’, stop=“png”)

I would like to have a transparent background and to change the
dimensions of the image to 1280x960.
Reading the documentation I had the impression that I just have to
modify some variables, but it does not work.

os.environ[‘GRASS_TRANSPARENT’] = ‘TRUE’
os.environ[‘GRASS_WIDTH’] = str(1280)
os.environ[‘GRASS_HEIGHT’] = str(960)
gscript.run_command(‘d.mon’, overwrite=True, start=‘png’,
output=filename)
gscript.run_command(‘d.rast’, map=‘{0}@{1}’.format(myraster,
self.mapset))
gscript.run_command(‘d.vect’, map=‘{0}@{1}’.format(myvector,
self.mapset), color=‘white’, fill_color=‘none’)
gscript.run_command(‘d.mon’, stop=“png”)

Thanks in advance for any advice.
Ciao

–
Jean Pierre Huart

OpenJph
19, rue de la fontaine
1340 Ottignies
web: www.openjph.be
email: jph@openjph.be
tel: +32 487 95 77 75
skype: jeanpierre.huart

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jean_pierre_huart · March 9, 2016, 2:39pm

Thanks Vinay, for the suggestion but I get an error on the d.out.file instruction.
By the way, I’ve investigated the problem a bit further and found that I mixed up instructions from manuals of different versions.
So coming back to GRASS v 7.0.x references I finally succeed in obtaining a solution but not 100% satisfactory.

First trial create a unique image combining raster and vector, but width and height remains at default and background is not transparent:

os.environ[‘GRASS_RENDER_TRANSPARENT’] = ‘TRUE’
os.environ[‘GRASS_RENDER_WIDTH’] = str(1280)
os.environ[‘GRASS_RENDER_HEIGHT’] = str(960)
os.environ[‘GRASS_RENDER_FILE’] = filenameCombined.png

self.gscript.run_command(‘d.mon’, overwrite=True, start=‘png’, output=filename)
self.gscript.run_command(‘d.rast’, map=‘{0}@{1}’.format(raster, currentmapset)
self.gscript.run_command(‘d.vect’, map=‘{0}@{1}’.format(map, currentmapset), color=‘white’, fill_color=‘none’)
self.gscript.run_command(‘d.mon’, stop=“png”)

Second trial successfull for obtaining desired width, height and transparency of the background but creating 2 images one for the raster and the other for the vector, now I would like to combine them to have only one image:

os.environ[‘GRASS_RENDER_IMMEDIATE’] = ‘png’
os.environ[‘GRASS_RENDER_TRANSPARENT’] = ‘TRUE’
os.environ[‘GRASS_RENDER_WIDTH’] = str(1280)
os.environ[‘GRASS_RENDER_HEIGHT’] = str(960)

os.environ[‘GRASS_RENDER_FILE’] = filenameOfRaster.png
self.gscript.run_command(‘d.rast’, map=‘{0}@{1}’.format(raster, currentmapset))

os.environ[‘GRASS_RENDER_FILE’] = filenameOfVector.png
self.gscript.run_command(‘d.vect’, map=‘{0}@{1}’.format(map, currentmapset), color=‘white’, fill_color=‘none’)

Modifying this with the following

os.environ[‘GRASS_RENDER_FILE’] = filenameCombined.png
self.gscript.run_command(‘d.rast’, map=‘{0}@{1}’.format(raster, currentmapset))
self.gscript.run_command(‘d.vect’, map=‘{0}@{1}’.format(map, currentmapset), color=‘white’, fill_color=‘none’)

ends with only the image of the vector.

I’ve the feeling that using d.mon would be preferable, but it seems that it does not take into account the environment variables (at the exception of GRASS_RENDER_FILE) that I propose.

If you have other suggestions to go further I’ll be very gratefull.
Ciao

···

-- 
Jean Pierre Huart

On 09/03/16 05:10, Vinay Elothunkal wrote:

Hi jean pierre huart,

I have exported png image using module “d.out.file”,(I have pasted a part of the script below which I have used. I hope this will help you…
…

import grass.script as g
import os
import shutil
import time

g.run_command(‘r.colors’,map=str(i),rules=‘color_table.txt’)
g.start_command(‘d.mon’, start=‘wx1’)
time.sleep(10)
g.run_command(‘d.rast’, map=str(i))
time.sleep(10)
g.run_command(‘d.vect’, map=str(i))
time.sleep(40)
g.run_command(‘d.out.file’,output=str(i),format=‘png’,size=(2403,2403))
time.sleep(10)
g.run_command(‘d.mon’, stop=‘wx1’)
time.sleep(10)
…

Regards,
Vinay

mlennert · March 9, 2016, 3:12pm

On 09/03/16 15:39, jean pierre huart wrote:

Thanks Vinay, for the suggestion but I get an error on the d.out.file
instruction.
By the way, I've investigated the problem a bit further and found that I
mixed up instructions from manuals of different versions.
So coming back to GRASS v 7.0.x references I finally succeed in
obtaining a solution but not 100% satisfactory.

First trial create a unique image combining raster and vector, but width
and height remains at default and background is not transparent:

     os.environ['GRASS_RENDER_TRANSPARENT'] = 'TRUE'
     os.environ['GRASS_RENDER_WIDTH'] = str(1280)
     os.environ['GRASS_RENDER_HEIGHT'] = str(960)
     os.environ['GRASS_RENDER_FILE'] = filenameCombined.png

     self.gscript.run_command('d.mon', overwrite=True, start='png',
output=filename)
     self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset)
     self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')
     self.gscript.run_command('d.mon', stop="png")

Second trial successfull for obtaining desired width, height and
transparency of the background but creating 2 images one for the raster
and the other for the vector, now I would like to combine them to have
only one image:

     os.environ['GRASS_RENDER_IMMEDIATE'] = 'png'
     os.environ['GRASS_RENDER_TRANSPARENT'] = 'TRUE'
     os.environ['GRASS_RENDER_WIDTH'] = str(1280)
     os.environ['GRASS_RENDER_HEIGHT'] = str(960)

     os.environ['GRASS_RENDER_FILE'] = filenameOfRaster.png
     self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset))

     os.environ['GRASS_RENDER_FILE'] = filenameOfVector.png
     self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')

Modifying this with the following

     os.environ['GRASS_RENDER_FILE'] = filenameCombined.png
     self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset))
     self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')

ends with only the image of the vector.

I've the feeling that using d.mon would be preferable, but it seems that
it does not take into account the environment variables (at the
exception of GRASS_RENDER_FILE) that I propose.

This script gives me differently sized png files with both maps displayed and transparent background:

import grass.script as gscript
import os

os.environ['GRASS_RENDER_TRANSPARENT']='TRUE'

for height in range(500,2000,500):
for width in range(500,2000,500):

         os.system('rm map.png')
         os.environ['GRASS_RENDER_HEIGHT']=str(height)
         os.environ['GRASS_RENDER_WIDTH']=str(width)

         gscript.run_command('d.mon', overwrite=True, start='png', output='map.png')
         gscript.run_command('d.rast', map_='elevation')
         gscript.run_command('d.vect', map_='roadsmajor')
         gscript.run_command('d.mon', stop="png")

os.system('identify map.png')

You can reach the same result with something like this:

import grass.script as gscript
import os

os.environ['GRASS_RENDER_TRANSPARENT']='TRUE'

for height in range(500,2000,500):
for width in range(500,2000,500):

         os.system('rm map.png')
         os.environ['GRASS_RENDER_IMMEDIATE']='png'
         os.environ['GRASS_RENDER_FILE']='map.png'
         os.environ['GRASS_RENDER_FILE_READ']='TRUE'
         os.environ['GRASS_RENDER_HEIGHT']=str(height)
         os.environ['GRASS_RENDER_WIDTH']=str(width)

gscript.run_command('d.rast', map_='elevation')
gscript.run_command('d.vect', map_='roadsmajor')

os.system('identify map.png')

You might have to watch out for existing files. If a file already exists with the indicated name then GRASS cannot change its width and height.

Hope this helps,
Moritz

jean_pierre_huart · March 9, 2016, 3:55pm

Bingo! Thanks Moritz,

- the existing file... I didn't care about it, convinced that the --overwrite parameter will wipe it out.
- os.environ['GRASS_RENDER_FILE_READ']='TRUE' to pile layers in one file, I thought it was only to import the first layer from an existing image.

Launching this script in a cron, I've the feeling that the use of GRASS_RENDER_IMMEDIATE is more appropriate. By the way, the choice is simple, this solution works fine for me, but using d.mon does not.

Ciao

On 09/03/16 16:12, Moritz Lennert wrote:

On 09/03/16 15:39, jean pierre huart wrote:

Thanks Vinay, for the suggestion but I get an error on the d.out.file
instruction.
By the way, I've investigated the problem a bit further and found that I
mixed up instructions from manuals of different versions.
So coming back to GRASS v 7.0.x references I finally succeed in
obtaining a solution but not 100% satisfactory.

First trial create a unique image combining raster and vector, but width
and height remains at default and background is not transparent:

     os.environ['GRASS_RENDER_TRANSPARENT'] = 'TRUE'
     os.environ['GRASS_RENDER_WIDTH'] = str(1280)
     os.environ['GRASS_RENDER_HEIGHT'] = str(960)
     os.environ['GRASS_RENDER_FILE'] = filenameCombined.png

     self.gscript.run_command('d.mon', overwrite=True, start='png',
output=filename)
     self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset)
     self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')
     self.gscript.run_command('d.mon', stop="png")

Second trial successfull for obtaining desired width, height and
transparency of the background but creating 2 images one for the raster
and the other for the vector, now I would like to combine them to have
only one image:

     os.environ['GRASS_RENDER_IMMEDIATE'] = 'png'
     os.environ['GRASS_RENDER_TRANSPARENT'] = 'TRUE'
     os.environ['GRASS_RENDER_WIDTH'] = str(1280)
     os.environ['GRASS_RENDER_HEIGHT'] = str(960)

     os.environ['GRASS_RENDER_FILE'] = filenameOfRaster.png
     self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset))

     os.environ['GRASS_RENDER_FILE'] = filenameOfVector.png
     self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')

Modifying this with the following

     os.environ['GRASS_RENDER_FILE'] = filenameCombined.png
     self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset))
     self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')

ends with only the image of the vector.

I've the feeling that using d.mon would be preferable, but it seems that
it does not take into account the environment variables (at the
exception of GRASS_RENDER_FILE) that I propose.

This script gives me differently sized png files with both maps displayed and transparent background:

import grass.script as gscript
import os

os.environ['GRASS_RENDER_TRANSPARENT']='TRUE'

for height in range(500,2000,500):
    for width in range(500,2000,500):

        os.system('rm map.png')
        os.environ['GRASS_RENDER_HEIGHT']=str(height)
        os.environ['GRASS_RENDER_WIDTH']=str(width)

        gscript.run_command('d.mon', overwrite=True, start='png', output='map.png')
        gscript.run_command('d.rast', map_='elevation')
        gscript.run_command('d.vect', map_='roadsmajor')
        gscript.run_command('d.mon', stop="png")

        os.system('identify map.png')

You can reach the same result with something like this:

import grass.script as gscript
import os

os.environ['GRASS_RENDER_TRANSPARENT']='TRUE'

for height in range(500,2000,500):
    for width in range(500,2000,500):

        os.system('rm map.png')
        os.environ['GRASS_RENDER_IMMEDIATE']='png'
        os.environ['GRASS_RENDER_FILE']='map.png'
        os.environ['GRASS_RENDER_FILE_READ']='TRUE'
        os.environ['GRASS_RENDER_HEIGHT']=str(height)
        os.environ['GRASS_RENDER_WIDTH']=str(width)

        gscript.run_command('d.rast', map_='elevation')
        gscript.run_command('d.vect', map_='roadsmajor')

        os.system('identify map.png')

You might have to watch out for existing files. If a file already exists with the indicated name then GRASS cannot change its width and height.

Hope this helps,
Moritz

mlennert · March 9, 2016, 4:08pm

On 09/03/16 16:55, jean pierre huart wrote:

Bingo! Thanks Moritz,

- the existing file... I didn't care about it, convinced that the
--overwrite parameter will wipe it out.

I agree that is a bit confusing (and could maybe be handled better), but --overwrite comes into action at the time of writing of the file, not at the time of reading the existing RENDER_FILE.

Launching this script in a cron, I've the feeling that the use of
GRASS_RENDER_IMMEDIATE is more appropriate. By the way, the choice is
simple, this solution works fine for me, but using d.mon does not.

What does not work with d.mon ? Does my below script work for you (it uses the NC demo data set [1]) ?

Moritz

[1] https://grass.osgeo.org/download/sample-data/

Ciao

On 09/03/16 16:12, Moritz Lennert wrote:

On 09/03/16 15:39, jean pierre huart wrote:

Thanks Vinay, for the suggestion but I get an error on the d.out.file
instruction.
By the way, I've investigated the problem a bit further and found that I
mixed up instructions from manuals of different versions.
So coming back to GRASS v 7.0.x references I finally succeed in
obtaining a solution but not 100% satisfactory.

First trial create a unique image combining raster and vector, but width
and height remains at default and background is not transparent:

      os.environ['GRASS_RENDER_TRANSPARENT'] = 'TRUE'
      os.environ['GRASS_RENDER_WIDTH'] = str(1280)
      os.environ['GRASS_RENDER_HEIGHT'] = str(960)
      os.environ['GRASS_RENDER_FILE'] = filenameCombined.png

      self.gscript.run_command('d.mon', overwrite=True, start='png',
output=filename)
      self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset)
      self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')
      self.gscript.run_command('d.mon', stop="png")

Second trial successfull for obtaining desired width, height and
transparency of the background but creating 2 images one for the raster
and the other for the vector, now I would like to combine them to have
only one image:

      os.environ['GRASS_RENDER_IMMEDIATE'] = 'png'
      os.environ['GRASS_RENDER_TRANSPARENT'] = 'TRUE'
      os.environ['GRASS_RENDER_WIDTH'] = str(1280)
      os.environ['GRASS_RENDER_HEIGHT'] = str(960)

      os.environ['GRASS_RENDER_FILE'] = filenameOfRaster.png
      self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset))

      os.environ['GRASS_RENDER_FILE'] = filenameOfVector.png
      self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')

Modifying this with the following

      os.environ['GRASS_RENDER_FILE'] = filenameCombined.png
      self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset))
      self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')

ends with only the image of the vector.

I've the feeling that using d.mon would be preferable, but it seems that
it does not take into account the environment variables (at the
exception of GRASS_RENDER_FILE) that I propose.

This script gives me differently sized png files with both maps
displayed and transparent background:

import grass.script as gscript
import os

os.environ['GRASS_RENDER_TRANSPARENT']='TRUE'

for height in range(500,2000,500):
     for width in range(500,2000,500):

         os.system('rm map.png')
         os.environ['GRASS_RENDER_HEIGHT']=str(height)
         os.environ['GRASS_RENDER_WIDTH']=str(width)

         gscript.run_command('d.mon', overwrite=True, start='png',
output='map.png')
         gscript.run_command('d.rast', map_='elevation')
         gscript.run_command('d.vect', map_='roadsmajor')
         gscript.run_command('d.mon', stop="png")

         os.system('identify map.png')

You can reach the same result with something like this:

import grass.script as gscript
import os

os.environ['GRASS_RENDER_TRANSPARENT']='TRUE'

for height in range(500,2000,500):
     for width in range(500,2000,500):

         os.system('rm map.png')
         os.environ['GRASS_RENDER_IMMEDIATE']='png'
         os.environ['GRASS_RENDER_FILE']='map.png'
         os.environ['GRASS_RENDER_FILE_READ']='TRUE'
         os.environ['GRASS_RENDER_HEIGHT']=str(height)
         os.environ['GRASS_RENDER_WIDTH']=str(width)

         gscript.run_command('d.rast', map_='elevation')
         gscript.run_command('d.vect', map_='roadsmajor')

         os.system('identify map.png')

You might have to watch out for existing files. If a file already
exists with the indicated name then GRASS cannot change its width and
height.

Hope this helps,
Moritz

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

jean_pierre_huart · March 9, 2016, 4:44pm

I launch a script without starting GRASS explicitly on an existing location, inspired by the solution proposed at https://grasswiki.osgeo.org/wiki/Working_with_GRASS_without_starting_it_explicitly.

I do not have any error in the logs, the image is created, but with default size (640x480) and white background.

I will try using the internal script console and give you a feed back if it works or not on my location/mapset.

Jean Pierre

On 09/03/16 17:08, Moritz Lennert wrote:

On 09/03/16 16:55, jean pierre huart wrote:

Bingo! Thanks Moritz,

- the existing file... I didn't care about it, convinced that the
--overwrite parameter will wipe it out.

I agree that is a bit confusing (and could maybe be handled better), but --overwrite comes into action at the time of writing of the file, not at the time of reading the existing RENDER_FILE.

Launching this script in a cron, I've the feeling that the use of
GRASS_RENDER_IMMEDIATE is more appropriate. By the way, the choice is
simple, this solution works fine for me, but using d.mon does not.

What does not work with d.mon ? Does my below script work for you (it uses the NC demo data set [1]) ?

Moritz

[1] https://grass.osgeo.org/download/sample-data/

Ciao

On 09/03/16 16:12, Moritz Lennert wrote:

On 09/03/16 15:39, jean pierre huart wrote:

Thanks Vinay, for the suggestion but I get an error on the d.out.file
instruction.
By the way, I've investigated the problem a bit further and found that I
mixed up instructions from manuals of different versions.
So coming back to GRASS v 7.0.x references I finally succeed in
obtaining a solution but not 100% satisfactory.

First trial create a unique image combining raster and vector, but width
and height remains at default and background is not transparent:

      os.environ['GRASS_RENDER_TRANSPARENT'] = 'TRUE'
      os.environ['GRASS_RENDER_WIDTH'] = str(1280)
      os.environ['GRASS_RENDER_HEIGHT'] = str(960)
      os.environ['GRASS_RENDER_FILE'] = filenameCombined.png

      self.gscript.run_command('d.mon', overwrite=True, start='png',
output=filename)
      self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset)
      self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')
      self.gscript.run_command('d.mon', stop="png")

Second trial successfull for obtaining desired width, height and
transparency of the background but creating 2 images one for the raster
and the other for the vector, now I would like to combine them to have
only one image:

      os.environ['GRASS_RENDER_IMMEDIATE'] = 'png'
      os.environ['GRASS_RENDER_TRANSPARENT'] = 'TRUE'
      os.environ['GRASS_RENDER_WIDTH'] = str(1280)
      os.environ['GRASS_RENDER_HEIGHT'] = str(960)

      os.environ['GRASS_RENDER_FILE'] = filenameOfRaster.png
      self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset))

      os.environ['GRASS_RENDER_FILE'] = filenameOfVector.png
      self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')

Modifying this with the following

      os.environ['GRASS_RENDER_FILE'] = filenameCombined.png
      self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset))
      self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')

ends with only the image of the vector.

I've the feeling that using d.mon would be preferable, but it seems that
it does not take into account the environment variables (at the
exception of GRASS_RENDER_FILE) that I propose.

This script gives me differently sized png files with both maps
displayed and transparent background:

import grass.script as gscript
import os

os.environ['GRASS_RENDER_TRANSPARENT']='TRUE'

for height in range(500,2000,500):
     for width in range(500,2000,500):

         os.system('rm map.png')
         os.environ['GRASS_RENDER_HEIGHT']=str(height)
         os.environ['GRASS_RENDER_WIDTH']=str(width)

         gscript.run_command('d.mon', overwrite=True, start='png',
output='map.png')
         gscript.run_command('d.rast', map_='elevation')
         gscript.run_command('d.vect', map_='roadsmajor')
         gscript.run_command('d.mon', stop="png")

         os.system('identify map.png')

You can reach the same result with something like this:

import grass.script as gscript
import os

os.environ['GRASS_RENDER_TRANSPARENT']='TRUE'

for height in range(500,2000,500):
     for width in range(500,2000,500):

         os.system('rm map.png')
         os.environ['GRASS_RENDER_IMMEDIATE']='png'
         os.environ['GRASS_RENDER_FILE']='map.png'
         os.environ['GRASS_RENDER_FILE_READ']='TRUE'
         os.environ['GRASS_RENDER_HEIGHT']=str(height)
         os.environ['GRASS_RENDER_WIDTH']=str(width)

         gscript.run_command('d.rast', map_='elevation')
         gscript.run_command('d.vect', map_='roadsmajor')

         os.system('identify map.png')

You might have to watch out for existing files. If a file already
exists with the indicated name then GRASS cannot change its width and
height.

Hope this helps,
Moritz

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jean_pierre_huart · March 9, 2016, 5:01pm

Launching the two scripts directly in GRASS7 console using my location/mapset give the following results for just one width, height (1280,960):

Using d.mon (not ok)
viascript.png PNG 640x480 640x480+0+0 8-bit DirectClass 30.5KB 0.000u 0:00.000

With GRASS_RENDER_IMMEDIATE (ok)
viascript2.png PNG 1280x960 1280x960+0+0 8-bit DirectClass 73.6KB 0.000u 0:00.000

I will test it with the NC demo soon.
Jean Pierre

On 09/03/16 17:44, jean pierre huart wrote:

I launch a script without starting GRASS explicitly on an existing location, inspired by the solution proposed at https://grasswiki.osgeo.org/wiki/Working_with_GRASS_without_starting_it_explicitly.

I do not have any error in the logs, the image is created, but with default size (640x480) and white background.

I will try using the internal script console and give you a feed back if it works or not on my location/mapset.

Jean Pierre

On 09/03/16 17:08, Moritz Lennert wrote:

On 09/03/16 16:55, jean pierre huart wrote:

Bingo! Thanks Moritz,

- the existing file... I didn't care about it, convinced that the
--overwrite parameter will wipe it out.

I agree that is a bit confusing (and could maybe be handled better), but --overwrite comes into action at the time of writing of the file, not at the time of reading the existing RENDER_FILE.

Launching this script in a cron, I've the feeling that the use of
GRASS_RENDER_IMMEDIATE is more appropriate. By the way, the choice is
simple, this solution works fine for me, but using d.mon does not.

What does not work with d.mon ? Does my below script work for you (it uses the NC demo data set [1]) ?

Moritz

[1] https://grass.osgeo.org/download/sample-data/

Ciao

On 09/03/16 16:12, Moritz Lennert wrote:

On 09/03/16 15:39, jean pierre huart wrote:

Thanks Vinay, for the suggestion but I get an error on the d.out.file
instruction.
By the way, I've investigated the problem a bit further and found that I
mixed up instructions from manuals of different versions.
So coming back to GRASS v 7.0.x references I finally succeed in
obtaining a solution but not 100% satisfactory.

First trial create a unique image combining raster and vector, but width
and height remains at default and background is not transparent:

      os.environ['GRASS_RENDER_TRANSPARENT'] = 'TRUE'
      os.environ['GRASS_RENDER_WIDTH'] = str(1280)
      os.environ['GRASS_RENDER_HEIGHT'] = str(960)
      os.environ['GRASS_RENDER_FILE'] = filenameCombined.png

      self.gscript.run_command('d.mon', overwrite=True, start='png',
output=filename)
      self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset)
      self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')
      self.gscript.run_command('d.mon', stop="png")

Second trial successfull for obtaining desired width, height and
transparency of the background but creating 2 images one for the raster
and the other for the vector, now I would like to combine them to have
only one image:

      os.environ['GRASS_RENDER_IMMEDIATE'] = 'png'
      os.environ['GRASS_RENDER_TRANSPARENT'] = 'TRUE'
      os.environ['GRASS_RENDER_WIDTH'] = str(1280)
      os.environ['GRASS_RENDER_HEIGHT'] = str(960)

      os.environ['GRASS_RENDER_FILE'] = filenameOfRaster.png
      self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset))

      os.environ['GRASS_RENDER_FILE'] = filenameOfVector.png
      self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')

Modifying this with the following

      os.environ['GRASS_RENDER_FILE'] = filenameCombined.png
      self.gscript.run_command('d.rast', map='{0}@{1}'.format(raster,
currentmapset))
      self.gscript.run_command('d.vect', map='{0}@{1}'.format(map,
currentmapset), color='white', fill_color='none')

ends with only the image of the vector.

I've the feeling that using d.mon would be preferable, but it seems that
it does not take into account the environment variables (at the
exception of GRASS_RENDER_FILE) that I propose.

This script gives me differently sized png files with both maps
displayed and transparent background:

import grass.script as gscript
import os

os.environ['GRASS_RENDER_TRANSPARENT']='TRUE'

for height in range(500,2000,500):
     for width in range(500,2000,500):

         os.system('rm map.png')
         os.environ['GRASS_RENDER_HEIGHT']=str(height)
         os.environ['GRASS_RENDER_WIDTH']=str(width)

         gscript.run_command('d.mon', overwrite=True, start='png',
output='map.png')
         gscript.run_command('d.rast', map_='elevation')
         gscript.run_command('d.vect', map_='roadsmajor')
         gscript.run_command('d.mon', stop="png")

         os.system('identify map.png')

You can reach the same result with something like this:

import grass.script as gscript
import os

os.environ['GRASS_RENDER_TRANSPARENT']='TRUE'

for height in range(500,2000,500):
     for width in range(500,2000,500):

         os.system('rm map.png')
         os.environ['GRASS_RENDER_IMMEDIATE']='png'
         os.environ['GRASS_RENDER_FILE']='map.png'
         os.environ['GRASS_RENDER_FILE_READ']='TRUE'
         os.environ['GRASS_RENDER_HEIGHT']=str(height)
         os.environ['GRASS_RENDER_WIDTH']=str(width)

         gscript.run_command('d.rast', map_='elevation')
         gscript.run_command('d.vect', map_='roadsmajor')

         os.system('identify map.png')

You might have to watch out for existing files. If a file already
exists with the indicated name then GRASS cannot change its width and
height.

Hope this helps,
Moritz

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

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grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user

mlennert · March 9, 2016, 7:04pm

On 09/03/16 18:01, jean pierre huart wrote:

Launching the two scripts directly in GRASS7 console using my
location/mapset give the following results for just one width, height
(1280,960):

Using d.mon (not ok)
viascript.png PNG 640x480 640x480+0+0 8-bit DirectClass 30.5KB 0.000u
0:00.000

I didn't try in the console, but directly in the terminal. Not sure how d.mon and wxGUI console interact.

Note that d.mon also has width and height parameters. Have you tried with those ?

Moritz

jean_pierre_huart · March 10, 2016, 8:48am

I did it also directly in the terminal and it's the same result.
Adding 'width' and 'height' parameters to d.mon has given the expected result.

viascript.png PNG 1280x960 1280x960+0+0 8-bit DirectClass 72.7KB 0.000u 0:00.000

(NB I tried it before unsuccessfully, but I was not deleting the existing image, thanks for mentioning it to me).

d.mon still fails for the transparent background.
I used the parameter 'bgcolor' to change the background color, but declaring bgcolor='none' give me an error.
'transparent' parameter does not exists. Any idea on which parameter to use for such behaviour?

With these tests, I have the impression that 'GRASS_RENDER_TRANSPARENT', 'GRASS_RENDER_HEIGHT', 'GRASS_RENDER_WIDTH' are not taken into account by d.mon.
I still have to test all this using another location instead of the one I've set up.

--
Jean Pierre Huart

On 09/03/16 20:04, Moritz Lennert wrote:

On 09/03/16 18:01, jean pierre huart wrote:

Launching the two scripts directly in GRASS7 console using my
location/mapset give the following results for just one width, height
(1280,960):

Using d.mon (not ok)
viascript.png PNG 640x480 640x480+0+0 8-bit DirectClass 30.5KB 0.000u
0:00.000

I didn't try in the console, but directly in the terminal. Not sure how d.mon and wxGUI console interact.

Note that d.mon also has width and height parameters. Have you tried with those ?

Moritz

mlennert · March 10, 2016, 9:14am

On 10/03/16 09:48, jean pierre huart wrote:

I did it also directly in the terminal and it's the same result.

[...]

With these tests, I have the impression that 'GRASS_RENDER_TRANSPARENT',
'GRASS_RENDER_HEIGHT', 'GRASS_RENDER_WIDTH' are not taken into account
by d.mon.

Thanks for all these tests. Ok, I've just tested and I can confirm that there seems to be an issue in grass70. Everything works for me in grass71.

Martin has done some serious rewriting of d.mon in trunk (grass71). Too much to be backported to the stable branch. I don't know if these things can easily be fixed in grass, or whether this is another serious argument to release grass sooner rather than later...

In conclusion, if you want to use d.mon, I suggest you try with grass71 for now.

Moritz

martinl · March 10, 2016, 9:45am

Hi,

2016-03-10 10:14 GMT+01:00 Moritz Lennert <mlennert@club.worldonline.be>:

Martin has done some serious rewriting of d.mon in trunk (grass71). Too much
to be backported to the stable branch. I don't know if these things can
easily be fixed in grass, or whether this is another serious argument to
release grass sooner rather than later...

backporting is not planned.

In conclusion, if you want to use d.mon, I suggest you try with grass71 for
now.

Agreed, Martin

--
Martin Landa
http://geo.fsv.cvut.cz/gwiki/Landa
http://gismentors.cz/mentors/landa