def create_rule(self, local_min, local_max, global_min, global_range, attr="value"):
rule = self.style_factory.createRule()
cql_filters = []
if not local_min == None:
cql_filters.append("%s >= %s" % (attr, local_min))
if not local_max == None:
cql_filters.append("%s < %s" % (attr, local_max))
cql = " and ".join(cql_filters)
gt_filter = CQL.toFilter(cql)
rule.setFilter(gt_filter)
if local_min == None:
brightness = 1.0
else:
brightness = 1.0 - (local_min - global_min)/global_range
color = Color.HSBtoRGB(0.0, 0.0, brightness)
fill = self.style_factory.createFill(
self.filter_factory.literal(color),
self.filter_factory.literal(1)
)
symbolizer = self.style_factory.createPolygonSymbolizer(None, fill, None)
rule.symbolizers().add(symbolizer)
return rule
def _toCQL(filter): """Encodes a filter object as a CQL string.""" return CQL.toCQL(filter)
def _fromCQL(cql): """Parses a CQL string into a filter object.""" return CQL.toFilter(cql)
def _toCQL(filter): """Encodes a filter object as a CQL string.""" return CQL.toCQL(filter)
def _fromCQL(cql): """Parses a CQL string into a filter object.""" return CQL.toFilter(cql)
