Index

1. Lecture: 20-1

• Prerequisites for this lecture are: 19-1, 19-2 and 19-3.

2. File export/File import/Next/Back

• improving the export function and coordinating the result of an unsuccessful export with the doom button
  • if the export should fail, then the doom3 button should be frozen

• def save_map (name):
      f = open (name, "w")
      f = write_assets (f)
      f.write ("\n")  # add blank line for eye candy
      f = write_map (f)
      f.close ()
  
  
  def myexport (name, tap):
      pygame.display.update ()
      save_map (current_map_name)
      check_export ()

3. check_export

• def check_export ():
    etc

4. write_map

• there is currently a problem with write_map and chisel
  • if the map has leading spaces chisel will fail
  • if the map has trailing spaces then chisel will also fail
• while this is a bug in chisel
  • we can avoid it by trimming spaces from our file in write_map
  • this is common practice - in software engineering

• def write_map (f):
      left, right = determine_range ()
      m = ""
      mdict = {"v":"#", "h":"#", "-":".", "|":".", " ":" ",
               "H":"H", "S":"S", "T":"T"}
      x, y = cell_array.high ()
      for j in range (y):
          for i in range (left, right+1):
              if mdict.has_key (cell_array.get (i, j)):
                  m += mdict[cell_array.get (i, j)]
              else:
                  m += cell_array.get (i, j)
          # skip blank lines
          m = m.rstrip ()
          if len (m) > 0:
              m += "\n"
      f.write (m)
      return f

5. determine_range

• def determine_range ():
      left = -1
      x, y = cell_array.high ()
      right = x
      for j in range (y):
          for i in range (x):
              if cell_array.get (i, j) != " ":
                  if (left == -1) or (i < left):
                      left = i
                  if i > right:
                      right = i
      return left, right

Index

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