[GRASSLIST:8287] Re: Making road maps

[Michael Barton]

The new version of d.vect now in the cvs can produce lines of varying
widths. 

D.text.freetype can produce rotated text of any size placed by geographic
coordinates, display coordinates (pixels or percent), and a mouse. [though
d.text.freetype apparently is having trouble on a Mac with OSX 10.4].

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution and Social Change
Arizona State University
Tempe, AZ 85287-2402

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton



> From: Hamish <hamish_nospam at yahoo.com>
> Date: Thu, 15 Sep 2005 12:20:37 +1200
> To: Mike Dvorak <mike at mikemath.net>
> Cc: <grasslist at baylor.edu>
> Subject: [GRASSLIST:8284] Re: Making road maps
> 
>>> 1. Is there any way to make vector lines wider when displaying them?
>>>  I would like to make different size vector lines for different
>>>  types of  roads.
>> 
> 
> It's a bit of a hack, but for the normal display monitor you could use
> 'v.extract where=' + v.buffer + d.vect for each kind of road.
> 
>> Use ps.map to make pretty maps.
> 
> Yes, e.g.
> 
> vlines mapname
>  where road_type = 'big'
>  width 3
>  end
> vlines mapname
>  where road_type = 'small'
>  width 1
>  end
> 
> also you could try loading GRASS vector maps into QGIS.
> 
> 
>> However, after a lot of errors and searching, the "vector" command is
>> no longer applicable in GRASS  6.1-cvs.  You need to use the "vlines",
>> "vpoints", and "vareas".
> 
> Look at "CHANGES BETWEEN VERSION 5.0.x/5.4.x and 6.0" at the start of
> the ps.map help page..
> 
> 
>>> 2. Is it possible to rotate the names/labels for my north/south
>>> streets 90 degrees from the east/west streets?
> 
> 'd.vect display=attr' will not rotate, but will display.
> 
> 
> Paint Labels: (improved version in grass 6.1-cvs, not in 6.0.1)
> 
> v.label -a
> ps.map, labels instruction
> 
> will align names along vector lines. Fine tune by editing the offsets in
> the $MAPSET/paint/labels/$LABELS_FILE in a text editor. This should work
> really well.
> 
> For the normal display monitor, d.paint.labels doesn't respect the
> rotatation setting that v.label figures out & so it just draws the
> labels horizontally*, but you could write a shell script that could do
> it by parsing the labels file & feeding into
> 'd.text.freetype text= rotation=' for each feature in a loop.
> This would be a really great script to have available on the GRASS Wiki
> add-ons page.... fame and fortune could be yours.
> 
> [*] I have just found that we have R_text_rotation() in the raster
> library.. perhaps d.paint.labels could be adapted! I will give it a try.
> I am not sure if d.font.freetype would still work to make pretty fonts,
> but I hope so.
> 
> 
> good luck,
> Hamish