Cairo driver: Difference between revisions

Latest revision as of 15:37, 5 February 2013

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Cairo display driver

(under development in GRASS 6.3-SVN)

Cairo driver help page

The Cairo driver generates PNG, BMP, PPM, PS, PDF or SVG images from GRASS display commands, using the Cairo graphics library. The image format is selected from the extension of the output file.

much of this page is based on this grass-dev thread:

http://thread.gmane.org/gmane.comp.gis.grass.devel/22786

To compile GRASS 6.3 with Cairo support, make sure you have the cairo.h include file (in Debian/Etch it's in the libcairo2-dev package)

Then configure grass with:

--with-cairo

If all went well, 'd.mon -l' should list the drivers as available monitors.

For SVG, PS, and PDF output Debian/Etch users (with libcairo2 1.2.4-4) may need to update to libcairo2 1.4.14 from Sid.

Examples

Example using the driver directly:

export GRASS_CAIROFILE=spearfish.png
export GRASS_WIDTH=800
export GRASS_HEIGHT=800

d.mon start=cairo
d.rast map=elevation.10m
d.vect map=streams width=1 color=blue fcolor=aqua type=area,line
d.vect map=roads width=2
d.mon stop=cairo

Example using d.out.file:

d.mon x0
d.rast map=elevation.10m
d.vect map=streams width=1 color=blue fcolor=aqua type=area,line
d.vect map=roads width=2

d.out.file -c sf_cairo format=png size=800,800

A more complicated example using d.out.file:

r.shaded.relief map=elevation.dem
r.watershed elev=elevation.dem basin=watershed.basin thresh=10000

export GRASS_WIDTH=800
export GRASS_HEIGHT=600

d.mon x1
d.shadedmap rel=elevation.dem.shade drape=watershed.basin bright=30
d.vect streams color=aqua fcolor=aqua type=area,line
d.vect roads where="label ~ 'light-duty road'" color=grey
d.vect roads where="label ~ 'unimproved'" color=brown
d.vect roads where="label ~ 'secondary highway'" color=100:100:100 width=2
d.vect roads where="label ~ 'primary highway'" color=50:50:50 width=2
d.vect railroads col=200:80:80 width=2
d.vect roads where="label = 'interstate'" color=black width=3
d.vect roads where="label = 'interstate'" color=grey
d.vect archsites icon=basic/star size=25 fcolor=yellow

# save graphing instructions to file so it survives beyond current monitor (stdin can't be recreated)
echo -e "width 2\nsymbol extra/fancy_compass 150 90 18 black" > dgr_tmp.txt
d.graph dgr_tmp.txt
d.text text="N" -b at=90,30.5 align=lc color=black

d.font Andale_Mono
d.text text="Spearfish, SD" -b color=black at=50,99 align=uc

d.out.file -c sf_cairo2 format=png

@@ Line 1: / Line 1: @@
+{{OutDated}}
 == Cairo display driver ==
-(under development)
+(under development in GRASS 6.3-SVN)
+* [http://grass.osgeo.org/grass63/manuals/html63_user/cairodriver.html Cairo driver help page]
-* [http://cairographics.org/ Cairo homepage]
+The Cairo driver generates PNG, BMP, PPM, PS, PDF or SVG images from GRASS display commands, using the [http://cairographics.org/ Cairo graphics library]. The image format is selected from the extension of the output file.
-based on this grass-dev thread:
+much of this page is based on this grass-dev thread:
   http://thread.gmane.org/gmane.comp.gis.grass.devel/22786
 To compile GRASS 6.3 with Cairo support, make sure you have the cairo.h include file (in Debian/Etch it's in the libcairo2-dev package)
-Then build grass with:
+Then configure grass with:
-  make USE_CAIRO=1
+  --with-cairo
+If all went well, '<tt>d.mon -l</tt>' should list the drivers as available monitors.
+* For SVG, PS, and PDF output Debian/Etch users (with libcairo2 1.2.4-4) may need to update to libcairo2 1.4.14 from Sid.
 === Examples ===
 Example using the driver directly:
- export GRASS_TRUECOLOR=TRUE
   export GRASS_CAIROFILE=spearfish.png
   export GRASS_WIDTH=800
@@ Line 27: / Line 35: @@
   d.vect map=roads width=2
   d.mon stop=cairo
 Example using ''d.out.file'':
@@ Line 40: / Line 47: @@
 A more complicated example using ''d.out.file'':
-  d.erase
+[[Image:Cairo-example.jpg|500px|center]]
-  d.vect -c fields type=area
+ r.shaded.relief map=elevation.dem
+ r.watershed elev=elevation.dem basin=watershed.basin thresh=10000
+ export GRASS_WIDTH=800
+ export GRASS_HEIGHT=600
+  d.mon x1
+  d.shadedmap rel=elevation.dem.shade drape=watershed.basin bright=30
   d.vect streams color=aqua fcolor=aqua type=area,line
   d.vect roads where="label ~ 'light-duty road'" color=grey
-  d.vect roads where="label ~ 'unimproved'" color=orange
+  d.vect roads where="label ~ 'unimproved'" color=brown
-  d.vect roads where="label ~ 'secondary highway'" color=100:100:100   width=2
+  d.vect roads where="label ~ 'secondary highway'" color=100:100:100 width=2
   d.vect roads where="label ~ 'primary highway'" color=50:50:50 width=2
-  d.vect railroads col=red width=2
+  d.vect railroads col=200:80:80 width=2
   d.vect roads where="label = 'interstate'" color=black width=3
-  d.vect archsites icon=extra/fancy_compass size=40
+ d.vect roads where="label = 'interstate'" color=grey
+  d.vect archsites icon=basic/star size=25 fcolor=yellow
+ # save graphing instructions to file so it survives beyond current monitor (stdin can't be recreated)
+ echo -e "width 2\nsymbol extra/fancy_compass 150 90 18 black" > dgr_tmp.txt
+ d.graph dgr_tmp.txt
+ d.text text="N" -b at=90,30.5 align=lc color=black
+ d.font Andale_Mono
+ d.text text="Spearfish, SD" -b color=black at=50,99 align=uc
-  d.out.file -c sf_c1 form=png --o
+  d.out.file -c sf_cairo2 format=png
+[[Category:Development]]
+[[Category:Documentation]]

Cairo driver: Difference between revisions

Latest revision as of 15:37, 5 February 2013

Cairo display driver

Examples

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