43 lines
1.1 KiB
Python
43 lines
1.1 KiB
Python
#!/usr/bin/env python
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from nose.tools import *
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from utilities import execution_path
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import os, mapnik
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def setup():
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# All of the paths used are relative, if we run the tests
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# from another directory we need to chdir()
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os.chdir(execution_path('.'))
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def test_query_tolerance():
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srs = '+init=epsg:4326'
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lyr = mapnik.Layer('test')
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lyr.datasource = mapnik.Shapefile(file='../data/shp/arrows.shp')
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lyr.srs = srs
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_width = 256
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_map = mapnik.Map(_width,_width, srs)
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_map.layers.append(lyr)
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# zoom determines tolerance
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_map.zoom_all()
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_map_env = _map.envelope()
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tol = (_map_env.maxx - _map_env.minx) / _width * 3
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# 0.046875 for arrows.shp and zoom_all
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assert tol == 0.046875
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# check point really exists
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x, y = 2.0, 4.0
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features = _map.query_point(0,x,y).features
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assert len(features) == 1
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# check inside tolerance limit
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x = 2.0 + tol * 0.9
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features = _map.query_point(0,x,y).features
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assert len(features) == 1
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# check outside tolerance limit
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x = 2.0 + tol * 1.1
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features = _map.query_point(0,x,y).features
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assert len(features) == 0
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