def remove_hidden(shapes: Sequence[Collection]):
"""Remove shapes from (nested) list if they are entirely covered.
Used to optimize SVG file without altering appearance, e.g. when
randomly placing objects to fill a region. Ignores opacity when
determining overlap.
Args:
shapes: A list of shapes.
"""
def process_list(l, cover):
for i, item in reversed(list(enumerate(l))):
if isinstance(item, list):
process_list(item, cover)
elif type(item) is Group:
if len(item.clip) > 0:
keep_shapes_inside(item.members, shapes.clip)
process_list(item.members, cover)
else:
shape = coverage(item)
if shape.within(cover[0]):
del l[i]
else:
cover[0] = cover[0].union(shape)
# Pass list to recursive calls so coverage updates:
cover = [SPoint((0, 0))]
# Pack in list because 'shapes' can be single group:
process_list([shapes], cover)
def coverage(obj: Collection) -> Union[SPolygon, SPoint, GeometryCollection]:
"""Create a shapely object.
Used to calculate area/coverage.
Args:
obj: One or more shapes.
Returns:
A shapely object representing the union of coverage for all
input shapes.
"""
if type(obj) is list:
cover = coverage(obj[0])
for o in obj[1:]:
cover = cover.union(coverage(o))
return cover
elif type(obj) in [Polygon, Spline, Line]:
return SPolygon([pt.state() for pt in obj.points])
elif type(obj) is Circle:
c = obj.c.state()
return SPoint(c[0], c[1]).buffer(obj.r.state())
else:
print("Can't get coverage for:", obj)
def random_point(self): poly = wkb.loads(bytes(self.geom.data)) (min_x, min_y, max_x, max_y) = poly.bounds while True: p = SPoint(random.uniform(min_x, max_x), random.uniform(min_y, max_y)) if poly.contains(p): return p
def keep_points_inside(points: Sequence[Pnt], boundary: Collection):
"""Keep points that lie within a boundary.
Args:
points: A list of points.
boundary: One or more shapes giving the boundary.
"""
# reverse so deleting items doesn't affect loop
for i, point in reversed(list(enumerate(points))):
if not coverage(boundary).intersects(SPoint(point)):
del points[i]
def checkIfObjectInArea(objectPos: Point, field: Field):
"""Checks if object in area of map.
Args:
field: polygon defining the area
objectPos (list): object x and y coordinates
Returns:
bool: True if object in area
"""
point = SPoint(objectPos.reprTuple())
(topLeft, topRight, bottomLeft, bottomRight) = field.reprTuple()
polygon = SPolygon((bottomLeft, topLeft, topRight, bottomRight))
return polygon.contains(point)
def as_shapely(self) -> SPoint:
"""Use with caution! Convert this point to a shapely point."""
# Shapely Point construction is expensive!
# Note that before python3.8, @cached_property was not thread safe,
# nor can it be used in a NamedTuple (which doesn't have a __dict__).
# (Points can be used by multi-threaded client code, even when
# SMARTS is still single-threaded, so we want to be safe here.)
# So we use the private global _shapely_points as a cache instead.
# Here we are relying on CPython's implementation of dict
# to be thread-safe.
cached = _shapely_points.get(self)
if cached:
return cached
spt = SPoint((self.x, self.y, self.z))
_shapely_points[self] = spt
return spt
def sample_points_in_shape(shape: dict, n: int) -> List[Pnt]:
"""Sample random points inside a shape.
Args:
shape: A shape (currently works for polygons and splines).
n: Number of points to sample.
Returns:
The sampled points.
"""
bound = bounding_box(shape)
points = []
for i in range(n):
while True:
p = (
np.random.uniform(bound[0], bound[2]),
np.random.uniform(bound[1], bound[3]),
)
region = SPolygon([pt.state() for pt in shape.points])
if SPoint(p[0], p[1]).within(region):
points.append(p)
break
return points
def shapely_contains(point):
point = SPoint(*point)
for shape in shapes:
if shape.contains(point) or shape.boundary.contains(point): return True
return False
for idx in correct_negatives:
ax.add_patch(patches.Circle(points[idx], 3, color='xkcd:red'))
for idx in false_negatives:
ax.add_patch(patches.Circle(points[idx], 3, color='xkcd:red'))
# ax.text(points[idx][0]+3, points[idx][1]-3 , axtext(points[idx][0], points[idx][1]), fontsize=5, zorder=5)
for idx in false_positives:
ax.add_patch(patches.Circle(points[idx], 3, color='xkcd:green'))
# ax.text(points[idx][0]+3, points[idx][1]-3 , axtext(points[idx][0], points[idx][1]), fontsize=5, zorder=5)
if len(false_negatives)> 0:
test_point = points[false_negatives[0]]
pt, spt = Point(*test_point), SPoint(*test_point)
found = None
for idx in range(len(obstacles.obss)):
if obstacles.obss[idx].point_in_obstacle(pt) != shapes[idx].contains(spt):
found = idx
break
if found is not None:
idx = found
print(idx)
obstacle = obstacles.obss[idx]
projection = Line(pt, Point(obstacle.x.max+5, pt.y))
print(projection)
num_cross = 0
for l in obstacle.lines:
print(l, l.intersects(projection), projection.intersects(l))
def endpoint(self):
return SPoint(self.coords[-1])
def startpoint(self):
return SPoint(self.coords[0])
def ConvertShapeToPlacemark(shape, geoid, aland, awater, kml):
#if len(shape.parts) > 1:
# print '----------geoid=%s aland=%s awater=%s' % (geoid, aland, awater)
if shape.shapeType != 5:
raise Exception('Unexpected shape type [%d] in file' % shape.shapeType)
pm = KML.Placemark(
KML.name('%s' % geoid),
KML.styleUrl('#ts'),
KML.ExtendedData(
KML.Data(
KML.displayName('ALAND'),
KML.value(aland),
name='string'
),
KML.Data(
KML.displayName('AWATER'),
KML.value(awater),
name='string'
)
),
KML.MultiGeometry(
KML.Polygon(
KML.extrude(0),
KML.altitudeMode('clampToGround')
)
)
)
# The parentPoly will be used to append rings, and a
# new Polygon will be appended for multiple rings in
# a geography.
parentPoly = pm.MultiGeometry.Polygon
#if len(shape.parts) > 1:
# print 'shape has %d parts' % len(shape.parts)
for i in range(0, len(shape.parts)):
lo = shape.parts[i]
hi = len(shape.points)
if i < len(shape.parts) - 1:
hi = shape.parts[i + 1]
#if len(shape.parts) > 1:
# print 'shape has points in [%d, %d) of %d' % (lo, hi, len(shape.points))
if (shape.points[lo][0] != shape.points[hi-1][0] or
shape.points[lo][1] != shape.points[hi-1][1]):
raise Exception('Loop endpoints in [%d, %d) do not match' % (lo, hi))
coords = []
for j in reversed(range(lo, hi)):
lng = shape.points[j][0]
lat = shape.points[j][1]
coords.append([lng, lat])
latlngCoords = []
for c in coords:
latlngCoords.append('%f,%f,0' % (c[0], c[1]))
coordinates = ' '.join(latlngCoords)
# Note: need LinearRing to compute ccw. Need Polygon to compute contains().
spoly = SPolygon(coords)
if i == 0:
parentSpoly = spoly
ring = polygon.LinearRing(coords)
# Some sanity checks to make sure all rings are closed, non-empty,
# and valid.
if not ring.is_ring:
raise Exception('Badly formatted non-ring : %s' % geoid)
if ring.is_empty:
raise Exception('Empty geometry found: %s' % geoid)
if not ring.is_valid:
raise Exception('Invalid ring: %s' % geoid)
if not ring.is_ccw:
# This ring is an internal (enclave) ring.
rring = copy.deepcopy(ring)
rring.coords = list(rring.coords)[::-1]
# Shapely contains does not handle point-overlaps. This
# means that enclaves which touch the containing ring
# are not handled correctly. To cure this, we check two
# points.
if not (parentSpoly.contains(SPoint(rring.coords[0])) or
parentSpoly.contains(SPoint(rring.coords[1]))):
print 'Out-of-order enclave'
# print 'ring %s does not contain %s' % (parentSpoly, ring)
# print ring
# print rring
# Note: if this triggers, we will need to store the polys
# to figure out which one is the enclosing one. Hopefully
# the census files will not exhibit this, although it is
# legal strictly according to the shapefule spec.
raise Exception('Out-of-order enclave')
coordinates = coordinates + ' 0,0,0'
parentPoly.append(KML.innerBoundaryIs(
KML.LinearRing(
KML.coordinates(coordinates)
)
))
else:
# Find the containing poly...
parentPoly.append(KML.innerBoundaryIs(
KML.LinearRing(
KML.coordinates(coordinates)
)
))
else:
if i > 0:
# Set the new parent polygon ring.
parentSpoly = spoly
parentPoly = KML.Polygon(
KML.extrude(0),
KML.altitudeMode('clampToGround'))
pm.MultiGeometry.append(parentPoly)
parentPoly.append(KML.outerBoundaryIs(
KML.LinearRing(
KML.coordinates(coordinates)
)
))
return pm
def CheckIfInsidePolygon(self, config, polygon):
spoint = SPoint(point[0], point[1])
return polygon.contains(spoint)
def convert(self):
return SPoint(self.x, self.y)
def filter_func(tree):
"""Inner function to filter tree by geo coordinates."""
return filter_poly.intersects(SPoint(tree.latitude, tree.longitude))
