jericks/geometrycommands

Commandline application for manipulating geometry.

Geometry command line library.

Geometry commands is a command line library for processing geometry that follows the unix philosophy. Each command does one thing well (buffer, centroid, envelope) by reading in a geometry, processing the geometry, and writing the geometry out as WKT. Individual commands can be connected with unix pipes. For more information please visit the web site.

Libraries

JTS:

https://locationtech.github.io/jts/

Proj4j:

http://trac.osgeo.org/proj4j/

Args4J:

http://args4j.kohsuke.org/

Examples:

Geometry input with -g argument:

>>> geom buffer -g "POINT (10 10)" -d 2

Geometry input using standard input stream:

>>> echo "POINT (10 10)" | geom buffer -d 20

Piping results of one geometry command to another:

>>> geom buffer -g "POINT (10 10)" -d 2 | geom envelope

Determine if one geometry contains another:

>>> echo "POINT (0 0)" | geom buffer -d 10 | geom contains -o "POINT (5 5)"
true
>>> echo "POINT (0 0)" | geom buffer -d 10 | geom contains -o "POINT (25 25)"
false

Buffer a point, get coordinates, draw coordinates to image, and open the image:

>>> echo "POINT (10 10)" | geom buffer -d 5 | geom coordinates | geom draw && open image.png

List available geometry commands:

>>> geom list
list
buffer
centroid
contains
convexHull
draw
difference
envelope
intersection

Getting Help

Each command contains a --help option:

>>> geom buffer --help
geom buffer: Buffer a geometry by a distance.
--help                    : Print help message
-c (--endCapStyle) VAL    : The end cap style (round, flat/butt, square)
-d (--distance) N         : The buffer distance
-g (--geometry) VAL       : The input geometry
-q (--quadrantSegments) N : The number of quadrant segments
-s (--singleSided)        : The flag for whether the buffer should be single sided

There is a man page for each subcommand:

>>> man geom-buffer
geom-buffer(1)                                                  geom-buffer(1)

NAME
       geom buffer

DESCRIPTION
       Buffer a geometry by a distance.

USAGE
       geom buffer -g "POINT (1 1)" -d 10

Finally, there is a bash completion script which makes using geom with bash much easier.

Install it in your .bash_profile:

source /Users/you/geom/shell/geom_bash_comp

Build

Geometry Commands depends on the Java Topology Suite (JTS) and Proj4j and uses Maven as a build tool.:

git checkout https://github.com/jericks/geometrycommands.git
cd /geometrycommands
mvn clean install

Build Native App

You can build a native app using Graalvm for MacOS or Linux. Download Graalvm and export a GRAALVM_HOME variable:

export GRAALVM_HOME=/Users/you/Applications/graalvm-ce-21.3.0/Contents/Home

Then you can run:

./mvnw clean install -DskipTests -Pnative

This will create a native geom executable.

Presentations

geometry commands

License

Geometry Commands is open source and licensed under the MIT License.