#!/usr/bin/env python
###############################################################################
# $Id: vec_tr_spat.py,v 1.1 2006/04/05 15:26:34 fwarmerdam Exp $
#
# Project:  OGR Python samples
# Purpose:  Apply a transformation to all OGR geometries.
# Author:   Frank Warmerdam, warmerdam@pobox.com
#
###############################################################################
# Copyright (c) 2006, Frank Warmerdam <warmerdam@pobox.com>
# 
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
###############################################################################
# 
#  $Log: vec_tr_spat.py,v $
#  Revision 1.1  2006/04/05 15:26:34  fwarmerdam
#  New
#
#  Revision 1.2  2006/04/05 14:38:56  fwarmerdam
#  Removed old srs junk, not used.
#
#  Revision 1.1  2006/03/30 18:58:04  fwarmerdam
#  New
#
#

import osr
import ogr
import string
import sys

#############################################################################
def Usage():
    print 'Usage: vec_tr_spat.py [-spat xmin ymin xmax ymax] infile outfile [layer]'
    print
    sys.exit(1)

#############################################################################
# Argument processing.

infile = None
outfile = None
layer_name = None

i = 1
while i < len(sys.argv):
    arg = sys.argv[i]

    if arg == '-spat':
        s_minx = int(sys.argv[i+1])
        s_miny = int(sys.argv[i+2])
        s_maxx = int(sys.argv[i+3])
        s_maxy = int(sys.argv[i+4])
        i = i + 4
        
    elif infile is None:
	infile = arg

    elif outfile is None:
	outfile = arg

    elif layer_name is None:
        layer_name = arg

    else:
	Usage()

    i = i + 1

if outfile is None:
    Usage()

#############################################################################
# Open the datasource to operate on.

in_ds = ogr.Open( infile, update = 0 )

if layer_name is not None:
    in_layer = in_ds.GetLayerByName( layer_name )
else:
    in_layer = in_ds.GetLayer( 0 )

in_defn = in_layer.GetLayerDefn()

#############################################################################
#	Create output file with similar information.

shp_driver = ogr.GetDriverByName( 'ESRI Shapefile' )
shp_driver.DeleteDataSource( outfile )

shp_ds = shp_driver.CreateDataSource( outfile )

shp_layer = shp_ds.CreateLayer( in_defn.GetName(),
                                geom_type = in_defn.GetGeomType(),
                                srs = in_layer.GetSpatialRef() )

in_field_count = in_defn.GetFieldCount()

for fld_index in range(in_field_count):
    src_fd = in_defn.GetFieldDefn( fld_index )
    
    fd = ogr.FieldDefn( src_fd.GetName(), src_fd.GetType() )
    fd.SetWidth( src_fd.GetWidth() )
    fd.SetPrecision( src_fd.GetPrecision() )
    shp_layer.CreateField( fd )

#############################################################################
# Apply spatial query.

in_layer.SetSpatialFilterRect( s_minx, s_miny, s_maxx, s_maxy )

#############################################################################
# Setup rect geometry to try intersect with.

ring = ogr.Geometry( ogr.wkbLinearRing )
ring.AddPoint_2D( s_minx, s_miny )
ring.AddPoint_2D( s_maxx, s_miny )
ring.AddPoint_2D( s_maxx, s_maxy )
ring.AddPoint_2D( s_minx, s_maxy )
ring.AddPoint_2D( s_minx, s_miny )

filt_geom = ogr.Geometry( ogr.wkbPolygon )
filt_geom.AddGeometry( ring )

#############################################################################
# Process all features in input layer.

in_feat = in_layer.GetNextFeature()
while in_feat is not None:

    geom = in_feat.GetGeometryRef()

    if geom.Intersect( filt_geom ) != 0:
        out_feat = ogr.Feature( feature_def = shp_layer.GetLayerDefn() )
        out_feat.SetFrom( in_feat )

        shp_layer.CreateFeature( out_feat )
        out_feat.Destroy()

    in_feat.Destroy()
    in_feat = in_layer.GetNextFeature()

#############################################################################
# Cleanup

shp_ds.Destroy()
in_ds.Destroy()


