def __init__(self, layer, filename, zoom, x, y):
MapGeoJSONTile.__init__(self, layer, filename, zoom, x, y)
self.labels = []
if zoom >= 16: # labels appear
for id, polygon, properties, style in self.polygons:
geojson = json.loads(properties['centroid'])
coordinates = geojson['coordinates']
center = project_to_tilespace_pixel(coordinates[1],
coordinates[0], zoom, x, y)
# If the label center is within this tile, use it.
if center[0] >= 0 and center[0] < 256 and center[
1] > 0 and center[1] < 256:
house_number = properties.get("house_number")
street = properties.get("street")
if house_number and street: # not None and not blank
self.labels.append((center, house_number, street))
def _project_to_tilespace_pixels(coordinates, zoom, xtile, ytile):
return map(
lambda p: project_to_tilespace_pixel(p[1], p[0], zoom, xtile, ytile),
coordinates)
def load_geojson(self, geojson):
points = self.points
lines = self.lines
polygons = self.polygons
assert geojson['type'] == 'FeatureCollection'
features = geojson['features']
if self.sort_key is not None:
features = sorted(
features,
key=lambda feature: feature['properties'][self.sort_key])
for feature in features:
assert feature['type'] == 'Feature'
id = feature.get('id', None)
properties = feature['properties']
geometry = feature['geometry']
if geometry["type"] == 'GeometryCollection':
geometries = geometry["geometries"]
else:
geometries = [geometry]
for geometry in geometries:
geometry_type = geometry['type']
try:
coordinates = geometry['coordinates']
except KeyError:
print("Warning: broken geometry:", feature)
continue
if geometry_type == 'Point':
style = self.choose_point_style(properties)
if style is not None:
point = project_to_tilespace_pixel(
coordinates[1], coordinates[0], self.zoom, self.x,
self.y)
points.append((id, point, properties, style))
continue
if geometry_type == 'LineString':
style = self.choose_line_style(properties)
if style is not None:
line = project_to_tilespace_pixels(
coordinates, self.zoom, self.x, self.y)
lines.append((id, line, properties, style))
continue
if geometry_type == 'MultiLineString':
style = self.choose_line_style(properties)
if style is not None:
for coordinates2 in coordinates:
line = project_to_tilespace_pixels(
coordinates2, self.zoom, self.x, self.y)
lines.append((id, line, properties, style))
continue
if geometry_type == 'Polygon':
style = self.choose_polygon_style(properties)
if style is not None:
for coordinates2 in coordinates:
polygon = project_to_tilespace_pixels(
coordinates2, self.zoom, self.x, self.y)
polygons.append((id, polygon, properties, style))
continue
if geometry_type == 'MultiPolygon':
style = self.choose_polygon_style(properties)
if style is not None:
for coordinates2 in coordinates:
for coordinates3 in coordinates2:
polygon = project_to_tilespace_pixels(
coordinates3, self.zoom, self.x, self.y)
polygons.append(
(id, polygon, properties, style))
continue
print("Warning: unimplemented geometry type:", feature)
def _project_to_tilespace_pixels(coordinates, zoom, xtile, ytile): return map(lambda p: project_to_tilespace_pixel(p[1], p[0], zoom, xtile, ytile), coordinates)
def load_geojson(self, geojson):
points = self.points
lines = self.lines
polygons = self.polygons
assert geojson['type'] == 'FeatureCollection'
features = geojson['features']
if self.sort_key is not None:
features = sorted(features, key=lambda feature: feature['properties'][self.sort_key])
for feature in features:
assert feature['type'] == 'Feature'
id = feature.get('id', None)
properties = feature['properties']
geometry = feature['geometry']
if geometry["type"] == 'GeometryCollection':
geometries = geometry["geometries"]
else:
geometries = [geometry]
for geometry in geometries:
geometry_type = geometry['type']
try:
coordinates = geometry['coordinates']
except KeyError:
print("Warning: broken geometry:", feature)
continue
if geometry_type == 'Point':
style = self.choose_point_style(properties)
if style is not None:
point = project_to_tilespace_pixel(coordinates[1], coordinates[0], self.zoom, self.x, self.y)
points.append((id, point, properties, style))
continue
if geometry_type == 'LineString':
style = self.choose_line_style(properties)
if style is not None:
line = project_to_tilespace_pixels(coordinates, self.zoom, self.x, self.y)
lines.append((id, line, properties, style))
continue
if geometry_type == 'MultiLineString':
style = self.choose_line_style(properties)
if style is not None:
for coordinates2 in coordinates:
line = project_to_tilespace_pixels(coordinates2, self.zoom, self.x, self.y)
lines.append((id, line, properties, style))
continue
if geometry_type == 'Polygon':
style = self.choose_polygon_style(properties)
if style is not None:
for coordinates2 in coordinates:
polygon = project_to_tilespace_pixels(coordinates2, self.zoom, self.x, self.y)
polygons.append((id, polygon, properties, style))
continue
if geometry_type == 'MultiPolygon':
style = self.choose_polygon_style(properties)
if style is not None:
for coordinates2 in coordinates:
for coordinates3 in coordinates2:
polygon = project_to_tilespace_pixels(coordinates3, self.zoom, self.x, self.y)
polygons.append((id, polygon, properties, style))
continue
print("Warning: unimplemented geometry type:", feature)
def project_to_tilespace_pixels(coordinates, zoom, xtile, ytile):
points = map(
lambda p: project_to_tilespace_pixel(p[1], p[0], zoom, xtile, ytile),
coordinates)
return list(points)
def project_to_tilespace_pixels(coordinates, zoom, xtile, ytile): points = map(lambda p: project_to_tilespace_pixel(p[1], p[0], zoom, xtile, ytile), coordinates) return list(points)