[GRASS-user] d.rast.arrows in high quality plot

GRASS GRASS user
1

Dear all,

I'm trying to plot arrows, representing length proportional to magnitude in a printable high resolution map (with d.rast.arrows). Here is what I tried:

#!/bin/sh
export GRASS_WIDTH=10000
export GRASS_HEIGHT=10000
export GRASS_PNGFILE=testpng.png
export GRASS_PNG_COMPRESSION=0
#export GRASS_RENDER_IMMEDIATE=TRUE
export GRASS_TRUECOLOR=TRUE
g.region fig_arrows
d.mon start=PNG
d.rast map=background@PERMANENT
d.rast map=Magnitude_map@PERMANENT
d.rast.arrow map=Direction_map@PERMANENT type=compass arrow_color=black grid_color=none x_color=black unknown_color=red skip=12 scale=20 magnitude_map=Magnitude_map@PERMANENT
d.mon stop=PNG
eog $GRASS_PNGFILE&

Unfortunately the plotted arrows are quite slim now... is there another solution to achieve this goal?

Many thanks,

Niklas

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2

Hi Niklas,

Same for me: the PNG driver draws thinner and thinner arrows when you
increase the resolution. If you lower the resolution it's okay though.

If you do need such a high resolution (for a poster?), you might try the
CAIRO driver (g.manual displaydrivers) which behaves quite differently
when producing PNGs. Arrows are drawn with a thicker pen indeed (even at
high pixel resolution) but you might be surprised by the raster
rendering... and files get very large.

Nicolas

Le mardi 02 novembre 2010 à 16:12 +0100, Niklas Neckel a écrit :

Dear all,

I'm trying to plot arrows, representing length proportional to magnitude in a printable high resolution map (with d.rast.arrows). Here is what I tried:

#!/bin/sh
export GRASS_WIDTH=10000
export GRASS_HEIGHT=10000
export GRASS_PNGFILE=testpng.png
export GRASS_PNG_COMPRESSION=0
#export GRASS_RENDER_IMMEDIATE=TRUE
export GRASS_TRUECOLOR=TRUE
g.region fig_arrows
d.mon start=PNG
d.rast map=background@PERMANENT
d.rast map=Magnitude_map@PERMANENT
d.rast.arrow map=Direction_map@PERMANENT type=compass arrow_color=black grid_color=none x_color=black unknown_color=red skip=12 scale=20 magnitude_map=Magnitude_map@PERMANENT
d.mon stop=PNG
eog $GRASS_PNGFILE&

Unfortunately the plotted arrows are quite slim now... is there another solution to achieve this goal?

Many thanks,

Niklas

3

Hi Nicolas,

Thank you very much! The arrows are thicker now and are visible on the final plot.

Cheers,

Niklas

-------- Original-Nachricht --------

Datum: Tue, 02 Nov 2010 23:26:01 +0100
Von: "Nicolas Pérenne" <nicolas.perenne@free.fr>
An: Niklas Neckel <Nikneck@gmx.de>
CC: grass-user@lists.osgeo.org
Betreff: Re: [GRASS-user] d.rast.arrows in high quality plot

Hi Niklas,

Same for me: the PNG driver draws thinner and thinner arrows when you
increase the resolution. If you lower the resolution it's okay though.

If you do need such a high resolution (for a poster?), you might try the
CAIRO driver (g.manual displaydrivers) which behaves quite differently
when producing PNGs. Arrows are drawn with a thicker pen indeed (even at
high pixel resolution) but you might be surprised by the raster
rendering... and files get very large.

Nicolas

Le mardi 02 novembre 2010 à 16:12 +0100, Niklas Neckel a écrit :
> Dear all,
>
> I'm trying to plot arrows, representing length proportional to magnitude
in a printable high resolution map (with d.rast.arrows). Here is what I
tried:
>
> #!/bin/sh
> export GRASS_WIDTH=10000
> export GRASS_HEIGHT=10000
> export GRASS_PNGFILE=testpng.png
> export GRASS_PNG_COMPRESSION=0
> #export GRASS_RENDER_IMMEDIATE=TRUE
> export GRASS_TRUECOLOR=TRUE
> g.region fig_arrows
> d.mon start=PNG
> d.rast map=background@PERMANENT
> d.rast map=Magnitude_map@PERMANENT
> d.rast.arrow map=Direction_map@PERMANENT type=compass arrow_color=black
grid_color=none x_color=black unknown_color=red skip=12 scale=20
magnitude_map=Magnitude_map@PERMANENT
> d.mon stop=PNG
> eog $GRASS_PNGFILE&
>
> Unfortunately the plotted arrows are quite slim now... is there another
solution to achieve this goal?
>
> Many thanks,
>
> Niklas
>
>

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GRATIS! Movie-FLAT mit über 300 Videos.
Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome