Jan-16-2021, 03:33 PM
Indeed, this is a Python 2 project. Python 2 was deprecated about a year ago, no longer supported.
I converted most of what I could find, but I don't have a test file. Try this:
I converted most of what I could find, but I don't have a test file. Try this:
"""
GMLMaker converts star data to yEd GML format.
Input is a *.csv file with the following fields:
HABHYG: HabHYG catalog number
HIP: Hipparcos catalog number
IS_HAB: is star habitable? (i.e., in HabCat database?)
DISPLAY_NAME: showy name to use for human readable map/list/whatever
HYG: HYG catalog number
BAYERFLAMSTEED: Bayer-Flamsteed name
GLIESE: gliese catalog number
BD
HD,
HR,
PROPER_NAME,
SPECTRAL_CLASS,
DISTANCE,
XG,
YG,
ZG,
ABSMAG
Requires Python 2.3 or later (uses CSV and optparse module)
"""
#******************************************************************************
# Imports
import csv
import math
import optparse
#******************************************************************************
# Class definitions
class LinkAlgorithm:
"""used to select line-determining algorithm"""
CLOSEST_NEIGHBOR,\
TWO_CLOSEST_NEIGHBORS,\
STAR_INTERFERENCE,\
MAX_AND_MIN,\
MATCH_LUMINOSITY,\
DIST_LIMIT,\
DIST_LIMIT_AND_NEIGHBOR,\
DIST_LIMIT_AND_TWO_NEIGHBOR,\
CLOSEST_HABITABLE,\
TWO_CLOSEST_HABITABLE,\
DIST_LIMIT_AND_HABITABLE,\
DIST_LIMIT_AND_TWO_HABITABLE,\
TWO_CLOSEST_HABITABLE_AND_TWO_NEIGHBOR\
= range(13)
DEFAULT_ALGORITHM = TWO_CLOSEST_NEIGHBORS
class SpectralClass:
"""used to encode spectral class"""
CLASS_O,\
CLASS_B,\
CLASS_A,\
CLASS_F,\
CLASS_G,\
CLASS_K,\
CLASS_M,\
CLASS_X,\
NUM_CLASSES\
= range(9)
encode = {
CLASS_O:"O",\
CLASS_B:"B",\
CLASS_A:"A",\
CLASS_F:"F",\
CLASS_G:"G",\
CLASS_K:"K",\
CLASS_M:"M",\
CLASS_X:"X"}
decode = {\
"O":CLASS_O,\
"B":CLASS_B,\
"A":CLASS_A,\
"F":CLASS_F,\
"G":CLASS_G,\
"K":CLASS_K,\
"M":CLASS_M,\
"X":CLASS_X}
class StarNodeColors:
"""color used to display spectral class in *.gml file"""
color = {
SpectralClass.CLASS_O:"#FF99FF",\
SpectralClass.CLASS_B:"#99FFFF",\
SpectralClass.CLASS_A:"#00FFFF",\
SpectralClass.CLASS_F:"#00FF00",\
SpectralClass.CLASS_G:"#FFFF99",\
SpectralClass.CLASS_K:"#FF9F40",\
SpectralClass.CLASS_M:"#FF9999",\
SpectralClass.CLASS_X:"#FFBBBB"}
HABSTAR_COLOR = "#FFFFFF"
HABSTAR_BORDER_COLOR = "#FF00FF"
class InputFields:
"""used to index into fields of input CSV file"""
HABHYG,\
HIP,\
IS_HAB,\
DISPLAY_NAME,\
HYG,\
BAYERFLAMSTEED,\
GLIESE,\
BD,\
HD,\
HR,\
PROPER_NAME,\
SPECTRAL_CLASS,\
DISTANCE,\
XG,\
YG,\
ZG,\
ABS_MAG\
= range(17)
class StarField:
"""used to index into a starNode tuple"""
HABHYG,\
DISPLAY_NAME,\
SPECTRAL_CODE,\
IS_HAB,\
LUMINOSITY,\
DISTANCE,\
LOCALE\
= range(7)
class Coord:
"""used to index into an XYZ locale tuple"""
XG,\
YG,\
ZG\
= range(3)
class BBCoord:
"""used to index into an bounding box"""
LEFT_X,\
TOP_Y,\
RIGHT_X,\
BOTTOM_Y\
= range(4)
class SystemField:
"""used to index into a starSystem node"""
INDEX,\
SYSTEM_NAME,\
BRIGHTEST_SPECTRALCLASS,\
BRIGHTEST_NAME,\
LOCALE,\
DISTANCE,\
SYSTEM_STARS,\
AT_LEAST_ONE_HABITABLE,\
PRINT_LOCALE\
= range(9)
class LinkField:
"""used to index into a link node"""
START_INDEX,\
DEST_INDEX,\
DISTANCE\
= range(3)
#******************************************************************************
# Function definitions
#--------------------------------------
def GetSystemAt(starSystems, locale):
"""return the index of any exisiting system within 0.3 parsecs
(one light year) of locale. Stars closer than that are assumed
to be part of a multiple star system."""
for systemIndex in starSystems:
system = starSystems[systemIndex]
systemLocale = system[SystemField.LOCALE]
if math.fabs(systemLocale[Coord.XG] - locale[Coord.XG]) < 0.3 and\
math.fabs(systemLocale[Coord.YG] - locale[Coord.YG]) < 0.3 and\
math.fabs(systemLocale[Coord.ZG] - locale[Coord.ZG]) < 0.3:
return system[SystemField.INDEX]
return None
#--------------------------------------
def LoadStars(theFileName):
"""read star data *.csv file and load data into starSystems"""
starSystems = {}
boundingBox = [9999.0, 9999.0, -9999.0, -9999.0]
index = -1
starSystemIndex = -1
excludeHeaderLine = True
try:
reader = csv.reader(theFileName + ".csv")
for row in reader:
if excludeHeaderLine:
excludeHeaderLine = False
continue
index += 1
# create starNode from row
habHYG = int(row[InputFields.HABHYG])
displayName = row[InputFields.DISPLAY_NAME]
theSpectralClass = row[InputFields.SPECTRAL_CLASS]
theSpectralClass = theSpectralClass[0:1]
try:
spectralCode = SpectralClass.decode[theSpectralClass]
except KeyError:
spectralCode = SpectralClass.CLASS_X
if row[InputFields.IS_HAB]:
isHab = True
else:
isHab = False
if float(row[InputFields.ABS_MAG]) > 0:
luminosity = float(row[InputFields.ABS_MAG])**3.5
else:
luminosity = 0.0
distance = float(row[InputFields.DISTANCE])
locale = (float(row[InputFields.XG]),\
float(row[InputFields.YG]),\
float(row[InputFields.ZG]))
starNode = (habHYG, displayName, spectralCode, isHab,\
luminosity, distance, locale)
if locale[Coord.XG] < boundingBox[BBCoord.LEFT_X]:
boundingBox[BBCoord.LEFT_X] = locale[Coord.XG]
if locale[Coord.XG] > boundingBox[BBCoord.RIGHT_X]:
boundingBox[BBCoord.RIGHT_X] = locale[Coord.XG]
if locale[Coord.YG] < boundingBox[BBCoord.TOP_Y]:
boundingBox[BBCoord.TOP_Y] = locale[Coord.YG]
if locale[Coord.YG] > boundingBox[BBCoord.BOTTOM_Y]:
boundingBox[BBCoord.BOTTOM_Y] = locale[Coord.YG]
print("Loading #%d: %s" % (index, starNode[1]))
# find star system that the new star belongs in
theSystemIndex = GetSystemAt(starSystems, locale)
if theSystemIndex == None: # create one
starSystemIndex += 1
theSystemIndex = starSystemIndex
brightestSpectralClassCode = SpectralClass.CLASS_X
systemStars = []
starSystemNode = [starSystemIndex, "", \
brightestSpectralClassCode, displayName, locale,\
distance, systemStars, False, locale]
starSystems[starSystemIndex] = starSystemNode # add it
# Get star system
starSystemNode = starSystems[theSystemIndex]
# Add the new star to the star system
if isHab:
starSystemNode[SystemField.AT_LEAST_ONE_HABITABLE] = True
if len(starSystemNode[SystemField.SYSTEM_NAME]) > 0:
starSystemNode[SystemField.SYSTEM_NAME] += ", "
starSystemNode[SystemField.SYSTEM_NAME] += displayName
if starSystemNode[SystemField.BRIGHTEST_SPECTRALCLASS] > spectralCode:
starSystemNode[SystemField.BRIGHTEST_SPECTRALCLASS] = spectralCode
starSystemNode[SystemField.BRIGHTEST_NAME] = displayName
starSystemNode[SystemField.SYSTEM_STARS].append(starNode)
# store changes
starSystems[theSystemIndex] = starSystemNode
except csv.Error:
print("LoadStars: Error parsing" + theFileName + ".csv")
boundingBox[BBCoord.LEFT_X] = math.floor(boundingBox[BBCoord.LEFT_X])
boundingBox[BBCoord.TOP_Y] = math.floor(boundingBox[BBCoord.TOP_Y])
boundingBox[BBCoord.RIGHT_X] = math.ceil(boundingBox[BBCoord.RIGHT_X])
boundingBox[BBCoord.BOTTOM_Y] = math.ceil(boundingBox[BBCoord.BOTTOM_Y])
return starSystems, boundingBox
#--------------------------------------
def TrueDistance(pointA, pointB):
"""given two cartesian co-ords, calculatate distance between them"""
deltaX = pointA[Coord.XG] - pointB[Coord.XG]
deltaY = pointA[Coord.YG] - pointB[Coord.YG]
deltaZ = pointA[Coord.ZG] - pointB[Coord.ZG]
return math.sqrt((deltaX * deltaX) +
(deltaY * deltaY) +
(deltaZ * deltaZ))
#--------------------------------------
def AddLink(starLinks, linkFile, startIndex, startName,
destIndex, destName, linkLength):
"""insert new link into starLinks and echo to linkFile"""
# Simulate C++ trinary operator x ? y : z
# with Python [z, y][bool(x)]
# theKey = smallerIndex:largerIndex
# so if link x to y is stored, new link y to x will NOT be stored
theKey = "%d:%d" % ([destIndex, startIndex][startIndex < destIndex],
[destIndex, startIndex][startIndex >= destIndex])
if not starLinks.has_key(theKey):
starLinks[theKey] = (startIndex, destIndex, linkLength)
linkFile.write("[%s]\t%.1fpc to\t[%s]\n" % (startName, linkLength, destName))
return starLinks
#--------------------------------------
def LinkNeighbor_(aStarSystem, starSystems, starLinks, linkFile,
forbiddenStars, onlyHab):
"""Create link between aStarSystem and closest qualified
starSystem and insert into starLinks. forbiddenStars is a list of
unqualified systems, and onlyHab flag commands that systems on both ends
of the link are habitable.
Selected system is inserted into forbiddenStars so that this
function can be called multiple times.
aStarSystem = origin star
starSystems = list of all stars
starLinks = list of star links
linkFile = link textfile
forbiddenStars = list of stars not to link to
onlyHab = "only link to habitable stars" flag"""
if aStarSystem[SystemField.INDEX] not in forbiddenStars:
forbiddenStars.append(aStarSystem[SystemField.INDEX])
# if onlyHab specifies, omit non-hab origin stars
if (not onlyHab) or (aStarSystem[SystemField.AT_LEAST_ONE_HABITABLE]):
closestNeighborDistance = 9999.0
closestNeighborIndex = None
for systemIndex in starSystems:
# do not link a forbidden system system
# (includes origin system and systems selected in
# prior passes through this function)
if systemIndex not in forbiddenStars:
destSystem = starSystems[systemIndex]
# if onlyHab specifies, omit non-hab destination stars
if (not onlyHab) or \
(destSystem[SystemField.AT_LEAST_ONE_HABITABLE]):
distance = TrueDistance(aStarSystem[SystemField.LOCALE],
destSystem[SystemField.LOCALE])
if distance < closestNeighborDistance:
closestNeighborDistance = distance
closestNeighborIndex = systemIndex
if closestNeighborIndex != None:
destSystem = starSystems[closestNeighborIndex]
forbiddenStars.append(closestNeighborIndex)
starLinks = AddLink(starLinks, linkFile,
aStarSystem[SystemField.INDEX],
aStarSystem[SystemField.SYSTEM_NAME],
destSystem[SystemField.INDEX],
destSystem[SystemField.SYSTEM_NAME],
closestNeighborDistance)
return starLinks
#--------------------------------------
def LinkNNeighbors(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars, onlyHab, numNeighbors):
"""call LinkNeighbor_ numNeighbors times"""
# insert dlog to get numNeighbors
for x in range(numNeighbors):
starLinks = LinkNeighbor_(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars, onlyHab)
return starLinks
#--------------------------------------
def LinkMaxAndMin_(aStarSystem, starSystems, starLinks, linkFile, minDist,
maxDist, maxLinks):
"""given aStarSystem, link to all other systems that are farther than
minDist and closer than maxDist"""
# insert dlog to get minDist, maxDist, and maxLinks
numLinks = 0
for systemIndex in starSystems:
destSystem = starSystems[systemIndex]
distance = TrueDistance(aStarSystem[SystemField.LOCALE],
destSystem[SystemField.LOCALE])
if (distance >= minDist) and (distance <= maxDist):
numLinks += 1
if numLinks <= maxLinks:
starLinks = AddLink(starLinks, linkFile,
aStarSystem[SystemField.INDEX],
aStarSystem[SystemField.SYSTEM_NAME],
destSystem[SystemField.INDEX],
destSystem[SystemField.SYSTEM_NAME],
distance)
else:
break
return starLinks
# START OF LINK FUNCTIONS
# these are passable to CalculateLinks as linkFunction
# link to 1 closest neighbor
def LinkNeighbor(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars):
starLinks = LinkNNeighbors(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars, False, 1)
return starLinks
# link to 1 closest habitable neighbor
def LinkHabNeighbor(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars):
starLinks = LinkNNeighbors(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars, True, 1)
return starLinks
# link to 2 closest neighbor
def LinkTwoNeighbors(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars):
starLinks = LinkNNeighbors(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars, False, 2)
return starLinks
# link to 2 closest habitable neighbor
def LinkTwoHabNeighbors(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars):
starLinks = LinkNNeighbors(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars, True, 2)
return starLinks
# link to maximum of 6 closest neighbors starting at 5.0 units (parsecs) to a maximum of 10 units
# edit the LinkMaxAndMin_() below to change the values
def LinkMaxAndMin(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars):
starLinks = LinkMaxAndMin_(aStarSystem, starSystems, starLinks, linkFile, 5.0, 10.0, 6)
return starLinks
# link to maximum of 100 closest neighbors within 2.5 units (parsecs)
# edit the LinkMaxAndMin_() below to change the values
def LinkDistanceLimit(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars):
starLinks = LinkMaxAndMin_(aStarSystem, starSystems, starLinks, linkFile, 0.0, 2.5, 100)
return starLinks
# link to maximum of 100 closest neighbors within 2.5 units,
# and to closest neighbor regardless of distance
def LinkDistLimitAndNeighbor(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars):
starLinks = LinkDistanceLimit(aStarSystem, starSystems, starLinks, linkFile)
starLinks = LinkNNeighbors(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars, False, 1)
return starLinks
# link to maximum of 100 closest neighbors within 2.5 units,
# and to closest 2 neighbor regardless of distance
def LinkDistLimitAndTwoNeighbor(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars):
starLinks = LinkDistanceLimit(aStarSystem, starSystems, starLinks, linkFile)
starLinks = LinkNNeighbors(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars, False, 2)
return starLinks
# link to maximum of 100 closest neighbors within 2.5 units,
# and to closest Habitable neighbor regardless of distance
def LinkDistLimitAndHabNeighbor(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars):
starLinks = LinkDistanceLimit(aStarSystem, starSystems, starLinks, linkFile)
starLinks = LinkNNeighbors(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars, True, 1)
return starLinks
# link to maximum of 100 closest neighbors within 2.5 units,
# and to closest 2 Habitable neighbor regardless of distance
def LinkDistLimitAndTwoHab(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars):
starLinks = LinkDistanceLimit(aStarSystem, starSystems, starLinks, linkFile)
starLinks = LinkNNeighbors(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars, True, 2)
return starLinks
# link to 2 closest neighbor
# and link to 2 closest habitable neighbor
def LinkTwoHabAndTwoNeighbor(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars):
starLinks = LinkNNeighbors(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars, False, 2)
starLinks = LinkNNeighbors(aStarSystem, starSystems, starLinks, linkFile, forbiddenStars, True, 2)
return starLinks
# END OF LINK FUNCTIONS
#--------------------------------------
def CalculateLinks(theFileName, starSystems, linkFunction):
"""this function iterates though the star list, passing
each star to the selected link function"""
linkFile = open(theFileName + "Links.txt", 'w')
starLinks = {}
index = -1
numStars = len(starSystems)
for systemIndex in starSystems:
forbiddenStars = []
index += 1
print("Calculating Star %d of %d" % (index, numStars))
starLinks = linkFunction(starSystems[systemIndex], starSystems,
starLinks, linkFile, forbiddenStars)
linkFile.close()
return starLinks
#--------------------------------------
def PrintGMLFile(theFileName, starSystems, starLinks):
"""writes a *.gml file suitable for yEd.exe"""
gmlFile = open(theFileName + ".gml", 'w')
# write header
gmlFile.write("Creator\t\"yFiles\"\n")
gmlFile.write("Version\t2.0\n")
gmlFile.write("graph\n")
gmlFile.write("[\n")
gmlFile.write("\thierarchic\t1\n")
gmlFile.write("\tlabel\t\"\"\n")
gmlFile.write("\tdirected\t1\n")
# write nodes
index = -1
numStars = len(starSystems)
for systemIndex in starSystems:
index += 1
print("Printing Star %d of %d" % (index, numStars))
aStarSystem = starSystems[systemIndex]
nameBuffer = aStarSystem[SystemField.SYSTEM_NAME].replace(
", ", "\n")
hasAtLeastOneLink = False
for linkIndex in starLinks:
aStarLink = starLinks[linkIndex]
if (aStarLink[LinkField.START_INDEX] == systemIndex or
aStarLink[LinkField.DEST_INDEX] == systemIndex):
hasAtLeastOneLink = True
break
if hasAtLeastOneLink:
gmlFile.write("\tnode\n")
gmlFile.write("\t[\n")
gmlFile.write("\t\tid\t%d\n" % (systemIndex))
gmlFile.write("\t\tlabel\t\"%s\"\n" % (nameBuffer))
gmlFile.write("\t\tgraphics\n")
gmlFile.write("\t\t[\n")
gmlFile.write("\t\t\tx\t0.0\n")
gmlFile.write("\t\t\ty\t0.0\n")
gmlFile.write("\t\t\tw\t35.0\n")
gmlFile.write("\t\t\th\t35.0\n")
if aStarSystem[SystemField.AT_LEAST_ONE_HABITABLE]:
gmlFile.write("\t\t\ttype\t\"ellipse\"\n")
gmlFile.write("\t\t\twidth\t3.0\n")
gmlFile.write("\t\t\toutline\t\"#000000\"\n")
else:
gmlFile.write("\t\t\ttype\t\"rectangle\"\n")
gmlFile.write("\t\t\twidth\t1.0\n")
gmlFile.write("\t\t\toutline\t\"#000000\"\n")
gmlFile.write("\t\t\tfill\t\"%s\"\n" % (StarNodeColors.color[
aStarSystem[SystemField.BRIGHTEST_SPECTRALCLASS]]
))
gmlFile.write("\t\t]\n")
gmlFile.write("\t\tLabelGraphics\n")
gmlFile.write("\t\t[\n")
gmlFile.write("\t\t\ttext\t\"%s\"\n" % (nameBuffer))
gmlFile.write("\t\t\tfontSize\t12\n")
gmlFile.write("\t\t\tfontName\t\"Arial Narrow\"\n")
gmlFile.write("\t\t\tanchor\t\t\"c\"\n")
gmlFile.write("\t\t]\n")
gmlFile.write("\t]\n")
# write edges
index = -1
numLinks = len(starLinks)
for linkIndex in starLinks:
index += 1
print("Printing link %d of %d" % (index, numLinks) )
aStarLink = starLinks[linkIndex]
startSystem = starSystems[aStarLink[LinkField.START_INDEX]]
destSystem = starSystems[aStarLink[LinkField.DEST_INDEX]]
gmlFile.write("\tedge\n")
gmlFile.write("\t[\n")
gmlFile.write("\t\tsource\t%d\n" % (aStarLink[LinkField.START_INDEX]))
gmlFile.write("\t\ttarget\t%d\n" % (aStarLink[LinkField.DEST_INDEX]))
gmlFile.write("\t\tgraphics\n")
gmlFile.write("\t\t[\n")
if (startSystem[SystemField.AT_LEAST_ONE_HABITABLE] and
destSystem[SystemField.AT_LEAST_ONE_HABITABLE]):
gmlFile.write("\t\t\twidth\t3\n")
else:
gmlFile.write("\t\t\twidth\t1\n")
gmlFile.write("\t\t\ttype\t\"line\"\n")
gmlFile.write("\t\t\tfill\t\"#000000\"\n")
gmlFile.write("\t\t]\n")
gmlFile.write("\t\tLabelGraphics\n")
gmlFile.write("\t\t[\n")
gmlFile.write("\t\t\ttext\t\"%.1f\"\n" %
(aStarLink[LinkField.DISTANCE]))
gmlFile.write("\t\t\toutline\t\"#000000\"\n")
gmlFile.write("\t\t\tfill\t\t\"#FFFFFF\"\n")
gmlFile.write("\t\t\tfontSize\t9\n")
gmlFile.write("\t\t\tfontName\t\"Dialog\"\n")
gmlFile.write("\t\t\tmodel\t\t\"centered\"\n")
gmlFile.write("\t\t\tposition\t\"center\"\n")
gmlFile.write("\t\t]\n")
gmlFile.write("\t]\n")
# all done
gmlFile.write("]\n")
gmlFile.close()
#******************************************************************************
# module/program switch
if __name__ == "__main__":
parser = optparse.OptionParser("usage: %prog [options] myStarFile.csv")
parser.add_option("-L", "--link", action="store", type="int", dest="linkCode", default=0, help="star linking algorithm (see help file)")
(options, args) = parser.parse_args()
if len(args) == 0:
starfileName = "HabHYG50ly.csv"
starfilePrefix = starfileName[:-4]
linkCode = options.linkCode
linkFunction = LinkNeighbor
if linkCode == 0:
linkFunction = LinkNeighbor
elif linkCode == 1:
linkFunction = LinkHabNeighbor
elif linkCode == 2:
linkFunction = LinkTwoNeighbors
elif linkCode == 3:
linkFunction = LinkTwoHabNeighbors
elif linkCode == 4:
linkFunction = LinkMaxAndMin
elif linkCode == 5:
linkFunction = LinkDistanceLimit
elif linkCode == 6:
linkFunction = LinkDistLimitAndNeighbor
elif linkCode == 7:
linkFunction = LinkDistLimitAndTwoNeighbor
elif linkCode == 8:
linkFunction = LinkDistLimitAndHabNeighbor
elif linkCode == 9:
linkFunction = LinkDistLimitAndTwoHab
elif linkCode == 10:
linkFunction = LinkTwoHabAndTwoNeighbor
else:
linkFunction = LinkNeighbor
print("** Loading Stars")
starSystems, boundingBox = LoadStars(starfilePrefix)
print("** Calculating Links")
starLinks = CalculateLinks(starfilePrefix, starSystems, linkFunction)
print("** Printing GML File")
PrintGMLFile(starfilePrefix, starSystems, starLinks)
print("** all done")
