def init_map(zoom, seq):
m = mapnik.Map(256, 256, merc_srs)
m.background_color = mapnik.Color('white')
s = mapnik.Style()
r = mapnik.Rule()
sym = mapnik.MarkersSymbolizer()
sym.fill = mapnik.Color('black')
sym.spacing = 0.0
sym.opacity = opacity(zoom)
sym.height = mapnik.Expression(str(pointWeight(zoom) / 2.0))
sym.width = mapnik.Expression(str(pointWeight(zoom) / 2.0))
# Ignore placement instructs Mapnik to avoid building the quadtree
# collision cache and helps performance if you know you want to
# allow for overlaps between features.
# - Dane
sym.allow_overlap = True
sym.ignore_placement = True
r.symbols.append(sym)
s.rules.append(r)
m.append_style('point_style', s)
TuplesDatasource.set_source(seq)
ds = mapnik.Python(factory='TuplesDatasource')
layer = mapnik.Layer('file', merc_srs)
layer.datasource = ds
layer.styles.append('point_style')
m.layers.append(layer)
return m
def test_python_circle_init():
ds = mapnik.Python(factory='python_plugin_test:CirclesDatasource')
e = ds.envelope()
assert_almost_equal(e.minx, -180, places=7)
assert_almost_equal(e.miny, -90, places=7)
assert_almost_equal(e.maxx, 180, places=7)
assert_almost_equal(e.maxy, 90, places=7)
def test_python_point_init():
ds = mapnik.Python(factory='python_plugin_test:PointDatasource')
e = ds.envelope()
assert_almost_equal(e.minx, 0, places=7)
assert_almost_equal(e.miny, -10, places=7)
assert_almost_equal(e.maxx, 100, places=7)
assert_almost_equal(e.maxy, 110, places=7)
geometry_type=mapnik.DataGeometryType.Polygon
)
def features(self, query):
# Get the query bounding-box as a shapely bounding box
bounding_box = box2d_to_shapely(query.bbox)
centre = Point(-20, 0)
return mapnik.PythonDatasource.wkb_features(
keys = (),
features = ConcentricCircles(centre, bounding_box, 0.5)
)
if __name__ == '__main__':
m = mapnik.Map(640, 320)
m.background = mapnik.Color('white')
s = mapnik.Style()
r = mapnik.Rule()
r.symbols.append(mapnik.LineSymbolizer())
s.rules.append(r)
m.append_style('point_style',s)
ds = mapnik.Python(factory='TestDatasource')
layer = mapnik.Layer('python')
layer.datasource = ds
layer.styles.append('point_style')
m.layers.append(layer)
box = mapnik.Box2d(-60, -60, 0, -30)
m.zoom_to_box(box)
mapnik.render_to_file(m,'map.png', 'png')
