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

[Niklas Neckel]

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 at free.fr>
> An: Niklas Neckel <Nikneck at gmx.de>
> CC: grass-user at 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 at PERMANENT 
> > d.rast map=Magnitude_map at PERMANENT 
> > d.rast.arrow map=Direction_map at PERMANENT type=compass  arrow_color=black
> grid_color=none  x_color=black unknown_color=red  skip=12 scale=20
> magnitude_map=Magnitude_map at 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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