# L-6 MCS 275 Mon 25 Jan 2010 : earthquakes.py

# Selects from the file quakes.cvs the latitude and longitude
# of those quakes of magnitude above a certain threshold.

import turtle

file = "quakes.cvs"
from makedata import ShowData

def SelectData(m):
   """
   Opens the file and returns list of
   ongitudes and latitudes of quakes of
   magnitude larger than or equal to m.
   Because latitude runs vertically,
   latitude is y and longitude is x.
   """
   R = []
   f = open(file,'r')
   s = f.readline()
   while True:
      s = f.readline()
      if s == '': break
      L = s.split(',')
      try: M = float(L[4])
      except: M = 0
      if M >= m:
         p = (float(L[3]),float(L[2]))
         R.append(p)
   return R

def Round(L):
   """
   Rounds all coordinates to the nearest integer.
   """
   R = []
   for each in L:
      p = (int(round(each[0])),int(round(each[1])))
      R.append(p)
   return R

def main():
   """
   Visualization of locations of largest earth quakes.
   """
   m = input("give threshold magnitude : ")
   K = SelectData(m)
   # print K
   L = [Round(K)]
   # print L
   turtle.hideturtle()
   ShowData(L)
   ans = raw_input("hit enter to exit ...")

main()