Function globals canvas MapStructure StyleableCacheable new

Construct an object.
@param name Prefix to use for entries in the cache
@param draw_func Function for the cache that will draw the
symbol onto a group using the style parameters.
@param cache The #SymbolCache to use for these symbols.
@param draw_mode See #SymbolCache
@param relevant_keys A list of keys for the style used by the
draw_func. Although it defaults to all
available keys, it is highly recommended
that it be specified.