def linemerge(shape):
""" Returns a geometry with lines merged using GEOSLineMerge.
"""
if shape.type != 'MultiLineString':
return shape
# copied from shapely.ops.linemerge at http://github.com/sgillies/shapely
result = lgeos.GEOSLineMerge(shape._geom)
return geom_factory(result)
def linemerge(self, lines):
"""Merges all connected lines from a source
The source may be a MultiLineString, a sequence of LineString objects,
or a sequence of objects than can be adapted to LineStrings. Returns a
LineString or MultiLineString when lines are not contiguous.
"""
source = None
if hasattr(lines, 'type') and lines.type == 'MultiLineString':
source = lines
elif hasattr(lines, '__iter__'):
try:
source = asMultiLineString([ls.coords for ls in lines])
except AttributeError:
source = asMultiLineString(lines)
if source is None:
raise ValueError("Cannot linemerge %s" % lines)
result = lgeos.GEOSLineMerge(source._geom)
return geom_factory(result)
