[GRASS-SVN] r35457 - in grass/trunk/swig/python: . examples
svn_grass at osgeo.org
svn_grass at osgeo.org
Sat Jan 17 08:03:46 EST 2009
Author: neteler
Date: 2009-01-17 08:03:45 -0500 (Sat, 17 Jan 2009)
New Revision: 35457
Added:
grass/trunk/swig/python/examples/m.distance.py
Removed:
grass/trunk/swig/python/examples/m.distance
Modified:
grass/trunk/swig/python/grasspython.dox
Log:
examples listed but they seem to require updates
Deleted: grass/trunk/swig/python/examples/m.distance
===================================================================
--- grass/trunk/swig/python/examples/m.distance 2009-01-17 12:48:17 UTC (rev 35456)
+++ grass/trunk/swig/python/examples/m.distance 2009-01-17 13:03:45 UTC (rev 35457)
@@ -1,202 +0,0 @@
-#!/usr/bin/python
-############################################################################
-#
-# MODULE: m.distance
-#
-# AUTHOR(S): Hamish Bowman, Dunedin, New Zealand
-#
-# PURPOSE: Find distance between two points
-# If the projection is latitude-longitude, this distance
-# is measured along the geodesic.
-# Demonstrates GRASS SWIG-Python interface
-#
-# COPYRIGHT: (c) 2008 Hamish Bowman, and The GRASS Development Team
-#
-# This program is free software under the GNU General Public
-# License (>=v2). Read the file COPYING that comes with GRASS
-# for details.
-#
-############################################################################
-#
-# Requires GRASS SWIG-Python interface
-# Requires Numeric module (NumPy) from http://numpy.scipy.org/
-# Requires NumPrt module from http://geosci.uchicago.edu/csc/numptr/
-#
-
-#%Module
-#% label: Finds the distance between two or more points.
-#% description: If the projection is latitude-longitude, this distance is measured along the geodesic.
-#% keywords: miscellaneous, distance, measure
-#%End
-#%Option
-#% key: coord
-#% type: string
-#% required: no
-#% multiple: yes
-#% key_desc: x,y
-#% description: Comma separated list of coordinate pairs
-#%End
-#%Flag
-#% key: i
-#% description: Read coordinate pairs from stdin
-#%End
-
-
-import os, sys
-
-if not os.environ.has_key("GISBASE"):
- print "You must be in GRASS GIS to run this program."
- sys.exit(1)
-
-
-def main():
-
- #### add your code here ####
-
- # run this before starting python to append module search path:
- # export PYTHONPATH=/usr/src/grass70/swig/python
- # check with "import sys; sys.path"
- # or:
- sys.path.append("/usr/src/grass70/swig/python")
- # FIXME: install the g7lib.py bindings in $GISBASE/lib/ ?
- import python_grass7 as g7lib
-
- # for passing pointers
- import Numeric
- import NumPtr
-
- g7lib.G_gisinit('m.distance')
- # returns 0 on success
-
-
- ### calc distance ###
-
- proj_type = g7lib.G_begin_distance_calculations()
- # returns 0 if projection has no metrix (ie. imagery)
- # returns 1 if projection is planimetric
- # returns 2 if projection is latitude-longitude
-
-
- # parser always creates at least an empty variable, and sys.argv is
- # toast, so no way to check if option was given. So it hangs if
- # --q was the only option given and there is no data from stdin.
- coord_ans = os.getenv("GIS_OPT_COORD")
- stdin_flag = bool(int(os.getenv("GIS_FLAG_I")))
-
- if stdin_flag is True:
- coords = []
- # read line by line from stdin
- while 1:
- line = sys.stdin.readline().strip()
- if not line: # EOF
- break
- else:
- coords += line.split(',')
- else:
- # read from coord= command line option
- coords = coord_ans.split(',')
-
-
- if len(coords) < 4:
- print "A minimum of two input coordinate pairs are needed"
- return
-
-
- # init variables
- overall_distance = 0.0
-
- if proj_type == 2:
- # lat/lon scan for DDD:MM:SS.SSSS
- easting = Numeric.array(0., Numeric.Float64)
- eastPtr = NumPtr.getpointer(easting)
- northing = Numeric.array(0., Numeric.Float64)
- northPtr = NumPtr.getpointer(northing)
-
- # TODO: for clarity, figure out how to replace "3" with
- # the defined LOCATION_LL constant from gis.i
- g7lib.G_scan_easting(coords[0], eastPtr, 3)
- g7lib.G_scan_northing(coords[1], northPtr, 3)
- x1 = float(easting)
- y1 = float(northing)
- else:
- # plain old coordinates
- x1 = float(coords[0])
- y1 = float(coords[1])
-
- x = [x1]
- y = [y1]
-
- for i in range(1, (len(coords) / 2)):
-
- if proj_type == 2:
- g7lib.G_scan_easting (coords[ i*2 + 0 ], eastPtr, 3)
- g7lib.G_scan_northing(coords[ i*2 + 1 ], northPtr, 3)
- x2 = float(easting)
- y2 = float(northing)
- else:
- x2 = float(coords[ i*2 + 0 ])
- y2 = float(coords[ i*2 + 1 ])
-
- segment_distance = g7lib.G_distance(x1, y1, x2, y2)
- overall_distance += segment_distance
-
- print "segment %d distance is %.2f meters" % (i, segment_distance)
-
- # add to the area array
-
- # setup for the next loop
- x1 = x2
- y1 = y2
-
- x += [x2]
- y += [y2]
-
- print
- print " total distance is %.2f meters" % overall_distance
- print
-
-
- ### calc area ###
- if len(coords) < 6:
- return
-
- g7lib.G_begin_polygon_area_calculations()
- # returns 0 if the projection is not measurable (ie. imagery or xy)
- # returns 1 if the projection is planimetric (ie. UTM or SP)
- # returns 2 if the projection is non-planimetric (ie. latitude-longitude)
-
- # do not need to close polygon (but it doesn't hurt if you do)
- npoints = len(x)
-
- # unset variables:
- #del [Xs, Xptr, Ys, Yptr]
- # or
- #Xs = Xptr = Ys = Yptr = None
-
- Xs = Numeric.array(x, Numeric.Float64)
- Xptr = NumPtr.getpointer(Xs)
- Ys = Numeric.array(y, Numeric.Float64)
- Yptr = NumPtr.getpointer(Ys)
-
- area = g7lib.G_area_of_polygon(Xptr, Yptr, npoints)
- print "AREA: %10.2f square meters" % area
- print
-
-
- # we don't need this, but just to have a look
- if False:
- if proj_type == 1:
- g7lib.G_database_units_to_meters_factor()
- # 1.0
- print "Location units are", g7lib.G_database_unit_name(True)
-
-
- #### end of your code ####
- return
-
-if __name__ == "__main__":
- if ( len(sys.argv) <= 1 or sys.argv[1] != "@ARGS_PARSED@" ):
- os.execvp("g.parser", [sys.argv[0]] + sys.argv)
- else:
- main();
-
Copied: grass/trunk/swig/python/examples/m.distance.py (from rev 35454, grass/trunk/swig/python/examples/m.distance)
===================================================================
--- grass/trunk/swig/python/examples/m.distance.py (rev 0)
+++ grass/trunk/swig/python/examples/m.distance.py 2009-01-17 13:03:45 UTC (rev 35457)
@@ -0,0 +1,202 @@
+#!/usr/bin/python
+############################################################################
+#
+# MODULE: m.distance
+#
+# AUTHOR(S): Hamish Bowman, Dunedin, New Zealand
+#
+# PURPOSE: Find distance between two points
+# If the projection is latitude-longitude, this distance
+# is measured along the geodesic.
+# Demonstrates GRASS SWIG-Python interface
+#
+# COPYRIGHT: (c) 2008 Hamish Bowman, and The GRASS Development Team
+#
+# This program is free software under the GNU General Public
+# License (>=v2). Read the file COPYING that comes with GRASS
+# for details.
+#
+############################################################################
+#
+# Requires GRASS SWIG-Python interface
+# Requires Numeric module (NumPy) from http://numpy.scipy.org/
+# Requires NumPrt module from http://geosci.uchicago.edu/csc/numptr/
+#
+
+#%Module
+#% label: Finds the distance between two or more points.
+#% description: If the projection is latitude-longitude, this distance is measured along the geodesic.
+#% keywords: miscellaneous, distance, measure
+#%End
+#%Option
+#% key: coord
+#% type: string
+#% required: no
+#% multiple: yes
+#% key_desc: x,y
+#% description: Comma separated list of coordinate pairs
+#%End
+#%Flag
+#% key: i
+#% description: Read coordinate pairs from stdin
+#%End
+
+
+import os, sys
+
+if not os.environ.has_key("GISBASE"):
+ print "You must be in GRASS GIS to run this program."
+ sys.exit(1)
+
+
+def main():
+
+ #### add your code here ####
+
+ # run this before starting python to append module search path:
+ # export PYTHONPATH=/usr/src/grass70/swig/python
+ # check with "import sys; sys.path"
+ # or:
+ sys.path.append("/usr/src/grass70/swig/python")
+ # FIXME: install the g7lib.py bindings in $GISBASE/lib/ ?
+ import python_grass7 as g7lib
+
+ # for passing pointers
+ import Numeric
+ import NumPtr
+
+ g7lib.G_gisinit('m.distance')
+ # returns 0 on success
+
+
+ ### calc distance ###
+
+ proj_type = g7lib.G_begin_distance_calculations()
+ # returns 0 if projection has no metrix (ie. imagery)
+ # returns 1 if projection is planimetric
+ # returns 2 if projection is latitude-longitude
+
+
+ # parser always creates at least an empty variable, and sys.argv is
+ # toast, so no way to check if option was given. So it hangs if
+ # --q was the only option given and there is no data from stdin.
+ coord_ans = os.getenv("GIS_OPT_COORD")
+ stdin_flag = bool(int(os.getenv("GIS_FLAG_I")))
+
+ if stdin_flag is True:
+ coords = []
+ # read line by line from stdin
+ while 1:
+ line = sys.stdin.readline().strip()
+ if not line: # EOF
+ break
+ else:
+ coords += line.split(',')
+ else:
+ # read from coord= command line option
+ coords = coord_ans.split(',')
+
+
+ if len(coords) < 4:
+ print "A minimum of two input coordinate pairs are needed"
+ return
+
+
+ # init variables
+ overall_distance = 0.0
+
+ if proj_type == 2:
+ # lat/lon scan for DDD:MM:SS.SSSS
+ easting = Numeric.array(0., Numeric.Float64)
+ eastPtr = NumPtr.getpointer(easting)
+ northing = Numeric.array(0., Numeric.Float64)
+ northPtr = NumPtr.getpointer(northing)
+
+ # TODO: for clarity, figure out how to replace "3" with
+ # the defined LOCATION_LL constant from gis.i
+ g7lib.G_scan_easting(coords[0], eastPtr, 3)
+ g7lib.G_scan_northing(coords[1], northPtr, 3)
+ x1 = float(easting)
+ y1 = float(northing)
+ else:
+ # plain old coordinates
+ x1 = float(coords[0])
+ y1 = float(coords[1])
+
+ x = [x1]
+ y = [y1]
+
+ for i in range(1, (len(coords) / 2)):
+
+ if proj_type == 2:
+ g7lib.G_scan_easting (coords[ i*2 + 0 ], eastPtr, 3)
+ g7lib.G_scan_northing(coords[ i*2 + 1 ], northPtr, 3)
+ x2 = float(easting)
+ y2 = float(northing)
+ else:
+ x2 = float(coords[ i*2 + 0 ])
+ y2 = float(coords[ i*2 + 1 ])
+
+ segment_distance = g7lib.G_distance(x1, y1, x2, y2)
+ overall_distance += segment_distance
+
+ print "segment %d distance is %.2f meters" % (i, segment_distance)
+
+ # add to the area array
+
+ # setup for the next loop
+ x1 = x2
+ y1 = y2
+
+ x += [x2]
+ y += [y2]
+
+ print
+ print " total distance is %.2f meters" % overall_distance
+ print
+
+
+ ### calc area ###
+ if len(coords) < 6:
+ return
+
+ g7lib.G_begin_polygon_area_calculations()
+ # returns 0 if the projection is not measurable (ie. imagery or xy)
+ # returns 1 if the projection is planimetric (ie. UTM or SP)
+ # returns 2 if the projection is non-planimetric (ie. latitude-longitude)
+
+ # do not need to close polygon (but it doesn't hurt if you do)
+ npoints = len(x)
+
+ # unset variables:
+ #del [Xs, Xptr, Ys, Yptr]
+ # or
+ #Xs = Xptr = Ys = Yptr = None
+
+ Xs = Numeric.array(x, Numeric.Float64)
+ Xptr = NumPtr.getpointer(Xs)
+ Ys = Numeric.array(y, Numeric.Float64)
+ Yptr = NumPtr.getpointer(Ys)
+
+ area = g7lib.G_area_of_polygon(Xptr, Yptr, npoints)
+ print "AREA: %10.2f square meters" % area
+ print
+
+
+ # we don't need this, but just to have a look
+ if False:
+ if proj_type == 1:
+ g7lib.G_database_units_to_meters_factor()
+ # 1.0
+ print "Location units are", g7lib.G_database_unit_name(True)
+
+
+ #### end of your code ####
+ return
+
+if __name__ == "__main__":
+ if ( len(sys.argv) <= 1 or sys.argv[1] != "@ARGS_PARSED@" ):
+ os.execvp("g.parser", [sys.argv[0]] + sys.argv)
+ else:
+ main();
+
Property changes on: grass/trunk/swig/python/examples/m.distance.py
___________________________________________________________________
Name: svn:executable
+ *
Name: svn:mergeinfo
+
Modified: grass/trunk/swig/python/grasspython.dox
===================================================================
--- grass/trunk/swig/python/grasspython.dox 2009-01-17 12:48:17 UTC (rev 35456)
+++ grass/trunk/swig/python/grasspython.dox 2009-01-17 13:03:45 UTC (rev 35457)
@@ -50,5 +50,14 @@
<li> vector.i
</ul>
+Examples:
+
+<ul>
+<li> examples/m.distance
+<li> examples/rasteraccess.py
+<li> examples/vectoraccess.py
+<li> test.py
+</ul>
+
*/
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