def test_adding_duplicate_points(self):
req = renderer.Request(0, 0, 0)
vtile = renderer.VectorTile(req)
vtile.add_point(0, 0, {})
vtile.add_point(0, 0, {})
j_obj = json.loads(vtile.to_geojson())
self.assertEqual(len(j_obj['features']), 1)
def test_vtile_z0(self):
req = renderer.Request(0, 0, 0)
vtile = renderer.VectorTile(req)
x, y = -8526703.378081053, 4740318.745473632
vtile.add_point(x, y, {})
j_obj = json.loads(vtile.to_geojson())
feature = j_obj['features'][0]
self.assertEqual(feature['type'], 'Feature')
self.assertEqual(feature['geometry']['type'], 'Point')
coords = feature['geometry']['coordinates']
self.assertAlmostEqual(coords[0], x, -4)
self.assertAlmostEqual(coords[1], y, -4)
def test_vtile_z22_higher_precision(self):
merc = renderer.SphericalMercator()
x, y = -8526703.378081053, 4740318.745473632
xyz_bounds = merc.xyz([x, y, x, y], 22)
req = renderer.Request(xyz_bounds[0], xyz_bounds[1], 22)
vtile = renderer.VectorTile(req, 512)
vtile.add_point(x, y, {})
j_obj = json.loads(vtile.to_geojson())
feature = j_obj['features'][0]
coords = feature['geometry']['coordinates']
self.assertAlmostEqual(coords[0], x, 4)
self.assertAlmostEqual(coords[1], y, 4)
def test_vtile_attributes(self):
req = renderer.Request(0, 0, 0)
vtile = renderer.VectorTile(req)
attr = {
"name": "DC",
"integer": 10,
"bigint": sys.maxint,
"nbigint": -1 * sys.maxint,
"float": 1.5,
"bigfloat": float(sys.maxint),
"unistr": u"élan",
"bool": True,
"bool2": False
}
vtile.add_point(0, 0, attr)
j_obj = json.loads(vtile.to_geojson())
self.assertEqual(j_obj['type'], "FeatureCollection")
self.assertEqual(len(j_obj['features']), 1)
feature = j_obj['features'][0]
self.assertDictEqual(feature['properties'], attr)
def test_vtile_z20(self):
merc = renderer.SphericalMercator()
x, y = -8526703.378081053, 4740318.745473632
xyz_bounds = merc.xyz([x, y, x, y], 20)
req = renderer.Request(xyz_bounds[0], xyz_bounds[1], 20)
vtile = renderer.VectorTile(req)
vtile.add_point(x, y, {"name": "DC", "integer": 10, "float": 1.5})
j_obj = json.loads(vtile.to_geojson())
self.assertEqual(j_obj['type'], "FeatureCollection")
self.assertEqual(len(j_obj['features']), 1)
feature = j_obj['features'][0]
self.assertDictEqual(feature['properties'], {
"integer": 10,
"float": 1.5,
"name": "DC"
})
self.assertEqual(feature['type'], 'Feature')
self.assertEqual(feature['geometry']['type'], 'Point')
coords = feature['geometry']['coordinates']
self.assertAlmostEqual(coords[0], x, 2)
self.assertAlmostEqual(coords[1], y, 2)
import sys
import json
# put `./lib` dir on path
sys.path.append("./python")
import renderer
if __name__ == "__main__":
# create a single tile at 0/0/0.png like tile.osm.org/0/0/0.png
zoom = 0
x = 0
y = 0
# request object holds a Tile XYZ and internally holds mercator extent
req = renderer.Request(x, y, zoom)
# create a vector tile, given a tile request
vtile = renderer.VectorTile(req)
# for a given point representing a spot in NYC
lat = 40.70512
lng = -74.01226
# and some attributes
attr = {"hello": "world"}
# convert to mercator coords
x, y = renderer.lonlat2merc(lng, lat)
# add this point and attributes to the tile
vtile.add_point(x, y, attr)
# print the protobuf as geojson just for debugging
# NOTE: coordinate rounding is by design and
print 'GeoJSON representation of tile (purely for debugging):'
print vtile.to_geojson()
print '-' * 60
# print the protobuf message as a string