def to_polygon(self, radius):
"""
Create a circular polygon with specified radius centered in the point.
:param radius:
Required radius of a new polygon, in km.
:returns:
Instance of :class:`~openquake.hazardlib.geo.polygon.Polygon` that
approximates a circle around the point with specified radius.
"""
assert radius > 0
# avoid circular imports
from openquake.hazardlib.geo.polygon import Polygon
# get a projection that is centered in the point
proj = geo_utils.OrthographicProjection(self.longitude, self.longitude,
self.latitude, self.latitude)
# create a shapely object from a projected point coordinates,
# which are supposedly (0, 0)
point = shapely.geometry.Point(*proj(self.longitude, self.latitude))
# extend the point to a shapely polygon using buffer()
# and create openquake.hazardlib.geo.polygon.Polygon object from it
return Polygon._from_2d(point.buffer(radius), proj)
def to_polygon(self, radius):
"""
Create a circular polygon with specified radius centered in the point.
:param radius:
Required radius of a new polygon, in km.
:returns:
Instance of :class:`~openquake.hazardlib.geo.polygon.Polygon` that
approximates a circle around the point with specified radius.
"""
assert radius > 0
# avoid circular imports
from openquake.hazardlib.geo.polygon import Polygon
# get a projection that is centered in the point
proj = geo_utils.OrthographicProjection(
self.longitude, self.longitude, self.latitude, self.latitude)
# create a shapely object from a projected point coordinates,
# which are supposedly (0, 0)
point = shapely.geometry.Point(*proj(self.longitude, self.latitude))
# extend the point to a shapely polygon using buffer()
# and create openquake.hazardlib.geo.polygon.Polygon object from it
return Polygon._from_2d(point.buffer(radius), proj)
def get_convex_hull(self):
"""
Get a convex polygon object that contains projections of all the points
of the mesh.
:returns:
Instance of :class:`openquake.hazardlib.geo.polygon.Polygon` that
is a convex hull around all the points in this mesh. If the
original mesh had only one point, the resulting polygon has a
square shape with a side length of 10 meters. If there were only
two points, resulting polygon is a stripe 10 meters wide.
"""
proj, polygon2d = self._get_proj_convex_hull()
# if mesh had only one point, the convex hull is a point. if there
# were two, it is a line string. we need to return a convex polygon
# object, so extend that area-less geometries by some arbitrarily
# small distance.
if isinstance(polygon2d,
(shapely.geometry.LineString, shapely.geometry.Point)):
polygon2d = polygon2d.buffer(self.DIST_TOLERANCE, 1)
# avoid circular imports
from openquake.hazardlib.geo.polygon import Polygon
return Polygon._from_2d(polygon2d, proj)
def get_convex_hull(self):
"""
Get a convex polygon object that contains projections of all the points
of the mesh.
:returns:
Instance of :class:`openquake.hazardlib.geo.polygon.Polygon` that
is a convex hull around all the points in this mesh. If the
original mesh had only one point, the resulting polygon has a
square shape with a side length of 10 meters. If there were only
two points, resulting polygon is a stripe 10 meters wide.
"""
proj, polygon2d = self._get_proj_convex_hull()
# if mesh had only one point, the convex hull is a point. if there
# were two, it is a line string. we need to return a convex polygon
# object, so extend that area-less geometries by some arbitrarily
# small distance.
if isinstance(polygon2d, (shapely.geometry.LineString,
shapely.geometry.Point)):
polygon2d = polygon2d.buffer(self.DIST_TOLERANCE, 1)
# avoid circular imports
from openquake.hazardlib.geo.polygon import Polygon
return Polygon._from_2d(polygon2d, proj)
