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from opencamlib import ocl, camvtk
import vtk
import math
import gzip
# Travelling Salesman Problem
# a.k.a. drill-path optimization
#
# we have multiple points in the 2D plane to visit.
# the task is to optimize the distance travelled by the tool while
# visiting all points
#
# uses data from TSPLIB (not included in opencamlib)
#
# ocl.TSPSolver() is a wrapper for boost::metric_tsp_approx()
# https://www.boost.org/doc/libs/1_67_0/libs/graph/doc/metric_tsp_approx.html
def drawPoints(myscreen, pts):
c=camvtk.PointCloud( pts )
c.SetPoints()
myscreen.addActor(c )
def drawTour(myscreen, pts, tour, tourColor = camvtk.red):
for n in range(0,len(tour)-1):
idx0 = n
idx1 = n+1
ip1 = pts[ tour[idx0] ]
ip2 = pts[ tour[idx1] ]
myscreen.addActor( camvtk.Line(p1=(ip1.x,ip1.y,ip1.z),p2=(ip2.x,ip2.y,ip2.z), color=tourColor) )
def TSPLIBReader( filename ):
""" read a .tsp format TSPLIB file, and return list of points """
#infile = open(filename,"r")
infile = gzip.open(filename, 'rb')
points = []
found = 0
n = 1
for line in infile.readlines():
if not found:
for word in line.split():
if word == "NODE_COORD_SECTION":
found = 1
else:
words = line.split()
if len(words)!=0 and words[0]!="EOF" :
points.append( ocl.Point( float( words[1] ), float( words[2] ) ) )
print("read ",len(points)," points from ", filename)
return points
def TSPTourReader( filename ):
infile = gzip.open(filename, 'rb')
points = []
found = 0
n = 1
for line in infile.readlines():
if not found:
for word in line.split():
if word == "TOUR_SECTION":
found = 1
else:
words = line.split()
if words[0]!="-1" and words[0]!="EOF" :
points.append( int( words[0] )-1 ) # NOTE our indexes start from 0, thus "-1"
print(" read length ",len(points)," tour from ",filename)
points.append( points[0] ) # end at the same point we started
return points
def TSPTourLength(pts,tour):
l = 0
for n in range(0,len(tour)-1):
start = n
stop = n + 1
#if stop == len(tour):
# stop = 0
#print start," - ",stop," =: ",tour[start],"-",tour[stop]
p1 = pts[ tour[start] ]
p2 = pts[ tour[stop] ]
d = round( math.sqrt( (p1.x-p2.x)*(p1.x-p2.x) + (p1.y-p2.y)*(p1.y-p2.y) ) )
l = l+d
return l
if __name__ == "__main__":
tspname = ["a280" , 2579 ]
tspname = ["eil51" , 426 ]
tspname = ["berlin52" , 7542 ]
tspname = ["bier127" , 118282 ]
tspname = ["brd14051" , 469385 ] # 90s
tspname = ["ch130" , 6110 ] #
tspname = ["ch150" , 6528 ] #
tspname = ["d198" , 15780 ] #
tspname = ["d493" , 35002 ]
tspname = ["d657" , 48912 ]
tspname = ["d1291" , 50801] # 0.7s
tspname = ["d1655" , 62128] # 1.23s
tspname = ["d2103" , 80450] # 1.98s
tspname = ["d15112" , 1573084] # 110s
tspname = ["d18512" , 645238] # 160s, 3.9-4.3 Gb
tspname = ["eil51" , 426 ]
tspname = ["eil76" , 538 ]
tspname = ["eil101" , 629 ]
tspname = ["fl417" , 11861 ]
tspname = ["fl1400" , 20127 ] # 0.92s
tspname = ["fl1577" , 22249 ] # 1.09s
tspname = ["fl3795" , 28772 ] # 6.5s
tspname = ["fnl4461" , 182566 ] # 9.2s
tspname = ["gil262" , 2378 ]
tspname = ["kroA100" , 21282 ]
tspname = ["kroB100" , 22141]
tspname = ["kroC100" , 20749]
tspname = ["kroD100" , 21294]
tspname = ["kroE100" , 22068]
tspname = ["kroA150" , 26524]
tspname = ["kroB150" , 26130]
tspname = ["kroA200" , 29368]
tspname = ["kroB200" , 29437]
tspname = ["lin105" , 14379]
tspname = ["lin318" , 42029]
tspname = ["linhp318" , 41345]
tspname = ["nrw1379" , 56638] # 0.87
tspname = ["p654" , 34643]
tspname = ["pcb442" , 50778]
tspname = ["pcb1173" , 56892]
tspname = ["pcb3038" , 137694] # 4s
tspname = ["pr76" , 108159]
tspname = ["pr107" , 44303]
tspname = ["pr124" , 59030]
tspname = ["pr136" , 96772]
tspname = ["pr144" , 58537]
tspname = ["pr152" , 73682]
tspname = ["pr226" , 80369]
tspname = ["pr264" , 49135]
tspname = ["pr299" , 48191]
tspname = ["pr439" , 107217]
tspname = ["pr1002" , 259045]
tspname = ["pr2392" , 378032]
tspname = ["pr2392" , 378032]
tspname = ["rat99" , 1211]
tspname = ["rat195" , 2323]
tspname = ["rat575" , 6773]
tspname = ["rat783" , 8806]
tspname = ["rd100" , 7910]
tspname = ["rd400" , 15281]
tspname = ["rl1304" , 252948]
tspname = ["rl1323" , 270199]
tspname = ["rl1889" , 316536] # 1.64s
tspname = ["rl5915" , 565530] # 15.95s
tspname = ["rl5934" , 556045] # 16.05s
tspname = ["rl11849" , 923288] # 68s
tspname = ["st70" , 675] #
tspname = ["ts225" , 126643] #
tspname = ["tsp225" , 3916] #
tspname = ["u159" , 42080]
tspname = ["u574" , 36905]
tspname = ["u724" , 41910]
tspname = ["u1060" , 224094]
tspname = ["u1432" , 152970]
tspname = ["u1817" , 57201]
tspname = ["u2319" , 234256] # grid
tspname = ["vm1084" , 239297]
tspname = ["vm1748" , 336556]
tspname = ["u2152" , 64253] # pcb
tspname = ["usa13509" , 19982859] # 86s
opt_len = tspname[1]
tspfile = "tsplib/"+tspname[0]+".tsp.gz"
#tourfile = "tsplib/"+tspname+".opt.tour.gz"
pts = TSPLIBReader( tspfile )
#tour = TSPTourReader( tourfile )
#print tour
#opt_len = TSPTourLength(pts,tour)
print(" optimal tour length = ",opt_len)
myscreen = camvtk.VTKScreen()
drawPoints(myscreen, pts)
#drawTour(myscreen, pts, tour, camvtk.green)
tsp = ocl.TSPSolver()
n=0
for p in pts:
tsp.addPoint( p.x , p.y)
n=n+1
print(" added ",n," points")
tsp.run()
r = tsp.getOutput()
l = tsp.getLength()
print
drawTour(myscreen, pts, r)
#tsp.reset()
print(" tour length= ",l, " ratio = ",float(l)/float(opt_len))
myscreen.camera.SetPosition(0.0, 0.0, 200)
myscreen.camera.SetViewUp(0.0, 0.0, 0)
myscreen.camera.SetFocalPoint(50, 50, 0)
myscreen.render()
w2if = vtk.vtkWindowToImageFilter()
w2if.SetInput(myscreen.renWin)
lwr = vtk.vtkPNGWriter()
lwr.SetInput( w2if.GetOutput() )
myscreen.iren.Start()
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