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maps.py
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maps.py
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"""Utilities for creating map templates for CARTO's Named Maps API"""
import json
def non_basemap_layers(layers):
"""Retrieve all map layers which are not basemaps"""
return [layer for layer in layers if not layer.is_basemap]
def top_basemap_layer_url(layers):
"""Returns the URL of the top map layer if it exists"""
if layers[-1].is_basemap and len(layers) > 1:
return layers[-1].url
return None
def has_time_layer(layers):
"""Returns `True` if there is a time/torque layer in `layers.
Returns `False` otherwise"""
return any(layer.time for layer in layers if not layer.is_basemap)
def get_map_name(layers, has_zoom):
"""Creates a map named based on supplied parameters"""
version = '20170406'
num_layers = len(non_basemap_layers(layers))
has_labels = len(layers) > 1 and layers[-1].is_basemap
has_time = has_time_layer(layers)
basemap_id = dict(light=0, dark=1, voyager=2)[layers[0].source]
return ('cartoframes_ver{version}'
'_layers{layers}'
'_time{has_time}'
'_baseid{baseid}'
'_labels{has_labels}'
'_zoom{has_zoom}').format(
version=version,
layers=num_layers,
has_time=('1' if has_time else '0'),
# TODO: Remove this once baselayer urls can be passed in named
# map config
baseid=basemap_id,
has_labels=('1' if has_labels else '0'),
has_zoom=('1' if has_zoom else '0')
)
def get_map_template(layers, has_zoom):
"""Creates a map template based on custom parameters supplied"""
num_layers = len(non_basemap_layers(layers))
has_time = has_time_layer(layers)
name = get_map_name(layers, has_zoom=has_zoom)
# Add basemap layer
layers_field = [{
'type': 'http',
'options': {
# TODO: Remove this once baselayer urls can be passed in named map
# config
'urlTemplate': layers[0].url,
# 'urlTemplate': '<%= basemap_url %>',
'subdomains': "abcd",
},
}]
# [BUG] Remove this once baselayer urls can be passed in named map config
placeholders = {}
# placeholders = {
# 'basemap_url': {
# 'type': 'sql_ident',
# 'default': ('https://cartodb-basemaps-{s}.global.ssl.fastly.net/'
# 'dark_all/{z}/{x}/{y}.png'),
# },
# }
for idx in range(num_layers):
layers_field.extend([{
'type': ('torque' if (has_time and idx == (num_layers - 1))
else 'mapnik'),
'options': {
'cartocss_version': '2.1.1',
'cartocss': '<%= cartocss_{idx} %>'.format(idx=idx),
'sql': '<%= sql_{idx} %>'.format(idx=idx),
# [BUG] No [] for templating
# 'interactivity': '<%= interactivity_{idx} %>'.format(
# idx=idx),
}
}])
placeholders.update({
'cartocss_{idx}'.format(idx=idx): {
'type': 'sql_ident',
'default': ('#layer {'
' marker-fill: red;'
' marker-width: 5;'
' marker-allow-overlap: true;'
' marker-line-color: #000; }'),
},
'sql_{idx}'.format(idx=idx): {
'type': 'sql_ident',
'default': (
"SELECT "
"ST_PointFromText('POINT(0 0)', 4326) AS the_geom, "
"1 AS cartodb_id, "
"ST_PointFromText('Point(0 0)', 3857) AS "
"the_geom_webmercator"
),
},
# [BUG] No [] for templating
# 'interactivity_{idx}'.format(idx=idx): {
# 'type': 'sql_ident',
# 'default': '["cartodb_id"]',
# },
})
# Add labels if they're in front
if num_layers > 0 and layers[-1].is_basemap:
layers_field.extend([{
'type': 'http',
'options': {
# TODO: Remove this once baselayer urls can be passed in named
# map config
'urlTemplate': layers[-1].url,
# 'urlTemplate': '<%= basemap_url %>',
'subdomains': "abcd",
},
}])
if has_zoom:
view = {
'zoom': '<%= zoom %>',
'center': {
'lng': '<%= lng %>',
'lat': '<%= lat %>',
},
}
placeholders.update({
'zoom': {
'type': 'number',
'default': 3,
},
'lng': {
'type': 'number',
'default': 0,
},
'lat': {
'type': 'number',
'default': 0,
},
})
else:
view = {
'bounds': {
'west': '<%= west %>',
'south': '<%= south %>',
'east': '<%= east %>',
'north': '<%= north %>',
},
}
placeholders.update({
'west': {
'type': 'number',
'default': -45,
},
'south': {
'type': 'number',
'default': -45,
},
'east': {
'type': 'number',
'default': 45,
},
'north': {
'type': 'number',
'default': 45,
},
})
return json.dumps({
'version': '0.0.1',
'name': name,
'placeholders': placeholders,
'layergroup': {
'version': '1.0.1',
'layers': layers_field,
},
'view': view,
})