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Taxi_Shapely.py
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Taxi_Shapely.py
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#!/usr/bin/python
import shapely.geometry as sg
import shapely.ops as ops
from scipy.spatial import distance
def mDist(p1,p2):
return abs(p2[0]-p1[0])+abs(p2[1]-p1[1])
epsilon=1e-04
def RegionsAt(p,pa):
dists = distance.cdist([p],pa, 'cityblock')[0]
dists = sorted(zip(dists,pa),key=lambda x:x[0])
i=1
while dists[i+1][0]-dists[i][0]<epsilon:
i+= 1
dists,pa = zip(*dists)
return pa[:i]
from TaxiPP import TaxiPP
def _rSide(r,o,s):
if len(s)==2:
m1,m2 = s
p = sg.Point(*r)
if p.within(m1): return m1
if p.within(m2): return m2
def rSide(r,o,s):
if len(s)==2:
m1,m2 = s
if len(m1.exterior.coords)>len(m2.exterior.coords):
m2,m1 = m1,m2
for v in m1.exterior.coords:
d = mDist(v,o)-mDist(v,r)
if d>epsilon:
return m1
elif -d>epsilon:
return m2
def NearestFirst(p,pa):
dists = distance.cdist([p],pa, 'cityblock')[0]
dists = sorted(zip(dists,pa),key=lambda x:x[0])
dists,pa = zip(*dists)
return pa
def Taxi(centroids,minMaxXY):
vertRegions = dict()
polies = list()
for c in centroids:
mesh = sg.box(*minMaxXY)
others = list(set(centroids)-{c})
for other in NearestFirst(c,others):
pp = sg.LineString(TaxiPP(c,other,minMaxXY))
r = rSide(c,other,ops.split(mesh,pp))
if r: mesh=r
finished = True
for p in mesh.exterior.coords:
if not p in vertRegions:
vertRegions[p] = RegionsAt(p,centroids)
if len(vertRegions[p])==1: finished = False
if finished:
break
# region mesh verts are all bordering 2 or 3 regions
if mesh.is_empty: oopes()
polies.append( mesh )
# remove invalid verts
#vertRegions = {v:vertRegions[v] for v in vertRegions if len(vertRegions[v])>1}
return polies