def create_node_feature(node, popup_template, default_style, indicators):
"""Create a feature representing a node.
Arguments:
node -- Node object (see graph.py)
popup_template -- template for the contents of the popup
default_style -- style values to use for properties which have no
indicator
indicators -- specifications of style properties based on
properties of the node
"""
style = union_dict(default_style, apply_indicators(indicators, node.properties))
return Feature(
node.id,
'node',
Geometry('Point', [node.lon, node.lat]),
style['color'],
style['size'],
create_node_popup(node, popup_template),
subdict(node.properties, _node_feature_properties),
)
def make_geojson_feature(feature):
"""Create a GeoJSON object for a feature."""
popup = None
if feature.popup:
popup = {
'id': feature.popup.id,
'size': feature.popup.size,
'content': feature.popup.content,
'closable': feature.popup.closable
}
return {
'type':
'Feature',
'id':
feature.id,
'geometry': {
'type': feature.geometry.type,
'coordinates': feature.geometry.coordinates
},
'properties':
union_dict(
{
'type': feature.type,
'color': feature.color,
'size': feature.size,
'popup': popup
}, feature.properties)
}
def make_feature(source_coords, target_coords, data):
style = union_dict(default_style, apply_indicators(indicators, data))
popup = create_edge_popup(data, popup_template)
return Feature(
data['id'],
'edge',
Geometry('LineString', [source_coords, target_coords]),
style['color'],
style['size'],
popup,
)
def apply_indicators(indicators, properties):
"""Apply a list of indicators to a list of properties."""
applicator = partial(apply_indicator, properties=properties)
return union_dict(*[applicator(i) for i in indicators])
