#coding=utf8
import os
import mapnik
from utilities import execution_path
from nose.tools import *

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('.'))

# the negative buffer on the layer should
# override the postive map buffer leading
# only one point to be rendered in the map
def test_layer_buffer_size_1():
    m = mapnik.Map(512,512)
    eq_(m.buffer_size,0)
    mapnik.load_map(m,'../data/good_maps/layer_buffer_size_reduction.xml')
    eq_(m.buffer_size,256)
    eq_(m.layers[0].buffer_size,-150)
    m.zoom_all()
    im = mapnik.Image(m.width,m.height)
    mapnik.render(m,im)
    actual = '/tmp/mapnik-layer-buffer-size.png'
    expected = 'images/support/mapnik-layer-buffer-size.png'
    im.save(actual)
    expected_im = mapnik.Image.open(expected)
    eq_(im.tostring(),expected_im.tostring(), 'failed comparing actual (%s) and expected (%s)' % (actual,'tests/python_tests/'+ expected))


if __name__ == "__main__":
    setup()
    [eval(run)() for run in dir() if 'test_' in run]