python - combining distance between pixels during while loop -


i'm working on uni assignment in python, need measure distance between pixels given points, can fine if use 2 points if use more 2 code measures each pair

how combine distance , display @ end of loop?

    def maplevel2(): # city x , y values   cityxvalue = [45,95,182,207,256,312,328,350,374,400]     cityyvalue = [310,147,84,201,337,375,434,348,335,265]  # display map   map = makepicture("d:/dropbox/dropbox/uni files/assesment do/introduction programming/assignment 3/images/map.png")  # city details   show(map)   numcity = requestinteger ("enter number of cities wish visit:")   = 0  # request city details   while < numcity:     cityone = requestinteger ("enter city visit")     citytwo = requestinteger ("enter city visit next")     x1 = cityone     y1 = cityone     x2 = citytwo      y2 = citytwo      addline(map, cityxvalue[x1], cityyvalue[y1], cityxvalue[x2], cityyvalue[y2])     = + 1     kms = getdistancebetween(cityxvalue[x1],cityyvalue[y1],cityxvalue[x2],cityyvalue[y2])     addtext(map,21,34,"%.9f" %kms)     repaint(map)      = 2     while < numcity:       cityone = citytwo       citytwo = requestinteger ("enter city visit next")       x1 = cityone       y1 = cityone       x2 = citytwo        y2 = citytwo        addline(map, cityxvalue[x1], cityyvalue[y1], cityxvalue[x2], cityyvalue[y2])       kms = getdistancebetween(cityxvalue[x1],cityyvalue[y1],cityxvalue[x2],cityyvalue[y2])       addtext(map,21,34,"%.9f" %kms)       repaint(map)       = + 1   # output file   #writepictureto(map,"d:/dropbox/dropbox/uni files/assesment do/introduction programming/assignment 3/images/marked-map.png")  def getdistancebetween(x1,y1,x2,y2):   return 10*sqrt(pow(x1-x2,2)+pow(y1-y2,2))

first problem: have 2 while loops should have one. first city outside loop, each subsequent city inside loop, , cityone = citytwo should last thing inside loop.

second problem: wrong (or @ least misleading):

x1 = cityone   # y1 = cityone    # wrong! x2 = citytwo    # y2 = citytwo   #  addline(map, cityxvalue[x1], cityyvalue[y1], cityxvalue[x2], cityyvalue[y2])

it should instead be

x1 = cityxvalue[cityone] y1 = cityyvalue[cityone] x2 = cityxvalue[citytwo] y2 = cityyvalue[citytwo] addline(map, x1, y1, x2, y2)

then can solve question: need total_dist = 0 before while loop, total_dist += kms inside loop, , move

addtext(map,21,34,"%.9f" % total_dist) repaint(map)

after loop.

for comparison, here oo version might bit easier follow:

in_map  = "d:/dropbox/dropbox/uni files/assesment do/introduction programming/assignment 3/images/map.png" out_map = "d:/dropbox/dropbox/uni files/assesment do/introduction programming/assignment 3/images/marked-map.png"  class city:     def __init__(self, x, y):         self.x = x         self.y = y     def distance(self, other):         return ((self.x - other.x) ** 2 + (self.y - other.y) ** 2) ** 0.5     def half_way(self, other):         return (self.x + other.x) / 2, (self.y + other.y) / 2  cities = [     city( 45, 310), city( 95, 147), city(182,  84), city(207, 201),     city(256, 337), city(312, 375), city(328, 434), city(350, 348),     city(374, 335), city(400, 265) ]  def maplevel2(cities=cities, in_map=in_map, out_map=out_map):     # show map     map = makepicture(in_map)     show(map)     # tour length     num_stops = requestinteger("enter number of cities wish visit: ")     # start touring!     total_dist = 0.     city_a = cities[requestinteger("enter city starting from: ")]     _ in range(1, num_stops):         city_b = cities[requestinteger("enter city visit next: ")]         # distances         dist = city_a.distance(city_b)         total_dist += dist         # show route on map         addline(map, city_a.x, city_a.y, city_b.x, city_b.y)         hx, hy = city_a.half_way(city_b)         addtext(map, hx, hy, "{:3.1f}".format(dist))  # changed! place distance label @ midpoint on route line         repaint(map)         # prepare next leg of tour         city_a = city_b     # show overall distance     addtext(map, 21, 34, "total: {:3.1f} km".format(total_dist))     repaint(map)     # output file     if out_map:         writepictureto(map, out_map)

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