def convert_polygons_to_centroids(V):
"""Convert polygon vector data to point vector data
Args:
* V: Vector layer with polygon data
Returns:
* Vector layer with point data and the same attributes as V
"""
msg = 'Input data %s must be polygon vector data' % V
verify(V.is_polygon_data, msg)
geometry = V.get_geometry()
N = len(V)
# Calculate points for each polygon
centroids = []
for i in range(N):
c = calculate_polygon_centroid(geometry[i])
centroids.append(c)
# Create new point vector layer with same attributes and return
V = Vector(data=V.get_data(),
projection=V.get_projection(),
geometry=centroids,
name='%s_centroid_data' % V.get_name(),
keywords=V.get_keywords())
return V
def convert_polygons_to_centroids(V):
"""Convert polygon vector data to point vector data
:param V: Vector layer with polygon data
:type V: Vector
:returns: Vector layer with point data and the same attributes as V
:rtype: Vector
"""
msg = 'Input data %s must be polygon vector data' % V
verify(V.is_polygon_data, msg)
geometry = V.get_geometry()
N = len(V)
# Calculate points for each polygon
centroids = []
for i in range(N):
c = calculate_polygon_centroid(geometry[i])
centroids.append(c)
# Create new point vector layer with same attributes and return
V = Vector(data=V.get_data(),
projection=V.get_projection(),
geometry=centroids,
name='%s_centroid_data' % V.get_name(),
keywords=V.get_keywords())
return V