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import os
import mapnik
def test_clearing_image_data():
im = mapnik.Image(256, 256)
# make sure it equals itself
bytes = im.tostring()
assert im.tostring() == bytes
# set background, then clear
im.fill(mapnik.Color('green'))
assert not im.tostring() == bytes
# clear image, should now equal original
im.clear()
assert im.tostring() == bytes
def make_map():
ds = mapnik.MemoryDatasource()
context = mapnik.Context()
context.push('Name')
pixel_key = 1
f = mapnik.Feature(context, pixel_key)
f['Name'] = str(pixel_key)
f.geometry = mapnik.Geometry.from_wkt(
'POLYGON ((0 0, 0 256, 256 256, 256 0, 0 0))')
ds.add_feature(f)
s = mapnik.Style()
r = mapnik.Rule()
symb = mapnik.PolygonSymbolizer()
r.symbols.append(symb)
s.rules.append(r)
lyr = mapnik.Layer('Places')
lyr.datasource = ds
lyr.styles.append('places_labels')
width, height = 256, 256
m = mapnik.Map(width, height)
m.append_style('places_labels', s)
m.layers.append(lyr)
m.zoom_all()
return m
if mapnik.has_grid_renderer():
def test_clearing_grid_data():
g = mapnik.Grid(256, 256)
utf = g.encode()
# make sure it equals itself
assert g.encode() == utf
m = make_map()
mapnik.render_layer(m, g, layer=0, fields=['__id__', 'Name'])
assert g.encode() != utf
# clear grid, should now match original
g.clear()
assert g.encode() == utf
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