#!/usr/bin/env python

import os

from nose.tools import eq_

import mapnik

from .utilities import execution_path, run_all

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('.'))

if 'shape' in mapnik.DatasourceCache.plugin_names():

def test_query_tolerance():

srs = '+init=epsg:4326'

lyr = mapnik.Layer('test')

ds = mapnik.Shapefile(file='../data/shp/arrows.shp')

lyr.datasource = ds

lyr.srs = srs

_width = 256

_map = mapnik.Map(_width, _width, srs)

_map.layers.append(lyr)

# zoom determines tolerance

_map.zoom_all()

_map_env = _map.envelope()

tol = (_map_env.maxx - _map_env.minx) / _width * 3

# 0.046875 for arrows.shp and zoom_all

eq_(tol, 0.046875)

# check point really exists

x, y = 2.0, 4.0

features = _map.query_point(0, x, y)

eq_(len(list(features)), 1)

# check inside tolerance limit

x = 2.0 + tol * 0.9

features = _map.query_point(0, x, y)

eq_(len(list(features)), 1)

# check outside tolerance limit

x = 2.0 + tol * 1.1

features = _map.query_point(0, x, y)

eq_(len(list(features)), 0)

if __name__ == "__main__":

setup()

exit(run_all(eval(x) for x in dir() if x.startswith("test_")))