mapnik/tests/python_tests/feature_id_test.py

#!/usr/bin/env python

from nose.tools import *

from utilities import execution_path

import os, sys, glob, mapnik2

def setup():
    # All of the paths used are relative, if we run the tests
    # from another directory we need to chdir()
    os.chdir(execution_path('.'))

def compare_shape_between_mapnik_and_ogr(shapefile,query=None):
    ds1 = mapnik2.Ogr(file=shapefile,layer_by_index=0)
    ds2 = mapnik2.Shapefile(file=shapefile)
    if query:
        fs1 = ds1.features(query)
        fs2 = ds2.features(query)
    else:
        fs1 = ds1.featureset()
        fs2 = ds2.featureset()
    count = 0;
    while(True):
        count += 1
        feat1 = fs1.next()
        feat2 = fs2.next()
        if not feat1:
            break
        #import pdb;pdb.set_trace()
        eq_(feat1.id(),feat2.id(),
            '%s : ogr feature id %s "%s" does not equal shapefile feature id %s "%s"' 
              % (count,feat1.id(),str(feat1.attributes), feat2.id(),str(feat2.attributes)) )
        
    return True
    


def test_shapefile_line_featureset_id():
    compare_shape_between_mapnik_and_ogr('../data/shp/polylines.shp')

def test_shapefile_polygon_featureset_id():
    compare_shape_between_mapnik_and_ogr('../data/shp/poly.shp')

def test_shapefile_polygon_feature_query_id():
    # results in different results between shp and ogr!
    #bbox = (-14284551.8434, 2074195.1992, -7474929.8687, 8140237.7628)
    bbox = (15523428.2632, 4110477.6323, -11218494.8310, 7495720.7404)
    query = mapnik2.Query(mapnik2.Box2d(*bbox))
    ds = mapnik2.Ogr(file='../data/shp/world_merc.shp',layer_by_index=0)
    for fld in ds.fields():
        query.add_property_name(fld)
    compare_shape_between_mapnik_and_ogr('../data/shp/world_merc.shp',query)



if __name__ == "__main__":
    setup()
    test_shapefile_line_featureset_id()
    test_shapefile_polygon_featureset_id()
    test_shapefile_polygon_feature_query_id()