Class: TimezoneFinder::FileConverter
- Inherits:
-
Object
- Object
- TimezoneFinder::FileConverter
- Defined in:
- lib/timezone_finder/file_converter.rb
Constant Summary collapse
- NR_SHORTCUTS_PER_LNG =
Don’t change this setup or timezonefinder wont work! different setups of shortcuts are not supported, because then addresses in the .bin would need to be calculated depending on how many shortcuts are being used. number of shortcuts per longitude
1
- NR_SHORTCUTS_PER_LAT =
shortcuts per latitude
2
Instance Method Summary collapse
- #big_zone(xmax, xmin, ymax, ymin) ⇒ Object
- #compile_into_binary(path = 'tz_binary.bin') ⇒ Object
- #compute_exact_shortcuts(xmax, xmin, ymax, ymin, line) ⇒ Object
-
#compute_x_intersection(y, x1, x2, y1, y2) ⇒ Object
returns the x intersection from a horizontal line in y with the line from x1,y1 to x1,y2.
-
#compute_y_intersection(x, x1, x2, y1, y2) ⇒ Object
returns the y intersection from a vertical line in x with the line from x1,y1 to x1,y2.
- #construct_shortcuts(shortcuts) ⇒ Object
- #included_shortcut_column_nrs(max_lng, min_lng) ⇒ Object
- #included_shortcut_row_nrs(max_lat, min_lat) ⇒ Object
-
#initialize ⇒ FileConverter
constructor
A new instance of FileConverter.
- #inside_polygon(x, y, x_coords, y_coords) ⇒ Object
- #ints_of(line = 0) ⇒ Object
- #is_left_of(x, y, x1, x2, y1, y2) ⇒ Object
- #latitudes_to_check(max_lat, min_lat) ⇒ Object
- #longitudes_to_check(max_lng, min_lng) ⇒ Object
- #parse_polygons_from_json(path = 'tz_world.json') ⇒ Object
-
#update_zone_names(path = 'timezone_names.rb') ⇒ Object
TODO :return:.
- #x_intersections(y, x_coords, y_coords) ⇒ Object
- #x_shortcut(lng) ⇒ Object
- #y_intersections(x, x_coords, y_coords) ⇒ Object
- #y_shortcut(lat) ⇒ Object
Constructor Details
#initialize ⇒ FileConverter
Returns a new instance of FileConverter.
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# File 'lib/timezone_finder/file_converter.rb', line 19 def initialize @nr_of_lines = -1 @all_tz_names = [] @ids = [] @boundaries = [] @all_coords = [] @all_lengths = [] @amount_of_holes = 0 @first_hole_id_in_line = [] @related_line = [] @all_holes = [] @all_hole_lengths = [] end |
Instance Method Details
#big_zone(xmax, xmin, ymax, ymin) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 260 def big_zone(xmax, xmin, ymax, ymin) # returns true if a zone with those boundaries could have more than 4 shortcuts (xmax - xmin) > (2.0 / NR_SHORTCUTS_PER_LNG) && (ymax - ymin) > (2.0 / NR_SHORTCUTS_PER_LAT) end |
#compile_into_binary(path = 'tz_binary.bin') ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 243 def compile_into_binary(path = 'tz_binary.bin') nr_of_floats = 0 zone_ids = [] shortcuts = {} def x_shortcut(lng) # puts lng if lng < -180 or lng >= 180 # raise 'longitude out of bounds' ((lng + 180) * NR_SHORTCUTS_PER_LNG).floor end def y_shortcut(lat) # puts lat if lat < -90 or lat >= 90 # raise 'this latitude is out of bounds' ((90 - lat) * NR_SHORTCUTS_PER_LAT).floor end def big_zone(xmax, xmin, ymax, ymin) # returns true if a zone with those boundaries could have more than 4 shortcuts (xmax - xmin) > (2.0 / NR_SHORTCUTS_PER_LNG) && (ymax - ymin) > (2.0 / NR_SHORTCUTS_PER_LAT) end def included_shortcut_row_nrs(max_lat, min_lat) (y_shortcut(max_lat)..y_shortcut(min_lat)).to_a end def included_shortcut_column_nrs(max_lng, min_lng) (x_shortcut(min_lng)..x_shortcut(max_lng)).to_a end def longitudes_to_check(max_lng, min_lng) output_list = [] step = 1.0 / NR_SHORTCUTS_PER_LNG current = (min_lng * NR_SHORTCUTS_PER_LNG).ceil.fdiv(NR_SHORTCUTS_PER_LNG) last = (max_lng * NR_SHORTCUTS_PER_LNG).floor.fdiv(NR_SHORTCUTS_PER_LNG) while current < last output_list << current current += step end output_list << last output_list end def latitudes_to_check(max_lat, min_lat) output_list = [] step = 1.0 / NR_SHORTCUTS_PER_LAT current = (min_lat * NR_SHORTCUTS_PER_LAT).ceil.fdiv(NR_SHORTCUTS_PER_LAT) last = (max_lat * NR_SHORTCUTS_PER_LAT).floor.fdiv(NR_SHORTCUTS_PER_LAT) while current < last output_list << current current += step end output_list << last output_list end # returns the x intersection from a horizontal line in y with the line from x1,y1 to x1,y2 def compute_x_intersection(y, x1, x2, y1, y2) delta_y = y2 - y1 return x1 if delta_y == 0 ((y - y1) * (x2 - x1)).fdiv(delta_y) + x1 end # returns the y intersection from a vertical line in x with the line from x1,y1 to x1,y2 def compute_y_intersection(x, x1, x2, y1, y2) delta_x = x2 - x1 return x1 if delta_x == 0 ((x - x1) * (y2 - y1)).fdiv(delta_x) + y1 end def x_intersections(y, x_coords, y_coords) # puts(x_coords.to_s) # puts(y) # puts(y_coords.to_s) intersects = [] (0...(y_coords.length - 1)).each do |i| iplus1 = i + 1 if y_coords[i] <= y # puts('Y1<=y') if y_coords[iplus1] > y # this was a crossing. compute the intersect # puts('Y2>y') intersects << compute_x_intersection(y, x_coords[i], x_coords[iplus1], y_coords[i], y_coords[iplus1]) end else # puts('Y1>y') if y_coords[iplus1] <= y # this was a crossing. compute the intersect # puts('Y2<=y') intersects << compute_x_intersection(y, x_coords[i], x_coords[iplus1], y_coords[i], y_coords[iplus1]) end end end intersects end def y_intersections(x, x_coords, y_coords) intersects = [] (0...(y_coords.length - 1)).each do |i| iplus1 = i + 1 if x_coords[i] <= x if x_coords[iplus1] > x # this was a crossing. compute the intersect intersects << compute_y_intersection(x, x_coords[i], x_coords[iplus1], y_coords[i], y_coords[iplus1]) end else if x_coords[iplus1] <= x # this was a crossing. compute the intersect intersects << compute_y_intersection(x, x_coords[i], x_coords[iplus1], y_coords[i], y_coords[iplus1]) end end end intersects end def compute_exact_shortcuts(xmax, xmin, ymax, ymin, line) shortcuts_for_line = Set.new # x_longs = binary_reader.x_coords_of(line) longs = ints_of(line) x_longs = longs[0] y_longs = longs[1] # y_longs = binary_reader.y_coords_of(line) y_longs << y_longs[0] x_longs << x_longs[0] step = 1.0 / NR_SHORTCUTS_PER_LAT # puts('checking the latitudes') latitudes_to_check(ymax, ymin).each do |lat| # puts(lat) # puts(coordinate_to_longlong(lat)) # puts(y_longs) # puts(x_intersections(coordinate_to_longlong(lat), x_longs, y_longs)) # raise intersects = x_intersections(Helpers.coord2int(lat), x_longs, y_longs).map do |x| Helpers.int2coord(x) end.sort # puts(intersects.to_s) nr_of_intersects = intersects.length if nr_of_intersects.odd? raise 'an uneven number of intersections has been accounted' end (0...nr_of_intersects).step(2).each do |i| possible_longitudes = [] # collect all the zones between two intersections [in,out,in,out,...] iplus = i + 1 intersection_in = intersects[i] intersection_out = intersects[iplus] if intersection_in == intersection_out # the polygon has a point exactly on the border of a shortcut zone here! # only select the top shortcut if it is actually inside the polygon (point a little up is inside) if inside_polygon(Helpers.coord2int(intersection_in), Helpers.coord2int(lat) + 1, x_longs, y_longs) shortcuts_for_line.add([x_shortcut(intersection_in), y_shortcut(lat) - 1]) end # the bottom shortcut is always selected shortcuts_for_line.add([x_shortcut(intersection_in), y_shortcut(lat)]) else # add all the shortcuts for the whole found area of intersection possible_y_shortcut = y_shortcut(lat) # both shortcuts should only be selected when the polygon doesnt stays on the border middle = intersection_in + (intersection_out - intersection_in) / 2 if inside_polygon(Helpers.coord2int(middle), Helpers.coord2int(lat) + 1, x_longs, y_longs) while intersection_in < intersection_out possible_longitudes << intersection_in intersection_in += step end possible_longitudes << intersection_out # the shortcut above and below of the intersection should be selected! possible_y_shortcut_min1 = possible_y_shortcut - 1 possible_longitudes.each do |possible_x_coord| shortcuts_for_line.add([x_shortcut(possible_x_coord), possible_y_shortcut]) shortcuts_for_line.add([x_shortcut(possible_x_coord), possible_y_shortcut_min1]) end else # polygon does not cross the border! while intersection_in < intersection_out possible_longitudes << intersection_in intersection_in += step end possible_longitudes << intersection_out # only the shortcut above of the intersection should be selected! possible_longitudes.each do |possible_x_coord| shortcuts_for_line.add([x_shortcut(possible_x_coord), possible_y_shortcut]) end end end end end # puts('now all the longitudes to check') # same procedure horizontally step = 1.0 / NR_SHORTCUTS_PER_LAT longitudes_to_check(xmax, xmin).each do |lng| # puts(lng) # puts(coordinate_to_longlong(lng)) # puts(x_longs) # puts(x_intersections(coordinate_to_longlong(lng), x_longs, y_longs)) intersects = y_intersections(Helpers.coord2int(lng), x_longs, y_longs).map do |y| Helpers.int2coord(y) end.sort # puts(intersects) nr_of_intersects = intersects.length if nr_of_intersects.odd? raise 'an uneven number of intersections has been accounted' end possible_latitudes = [] (0...nr_of_intersects).step(2).each do |i| # collect all the zones between two intersections [in,out,in,out,...] iplus = i + 1 intersection_in = intersects[i] intersection_out = intersects[iplus] if intersection_in == intersection_out # the polygon has a point exactly on the border of a shortcut here! # only select the left shortcut if it is actually inside the polygon (point a little left is inside) if inside_polygon(Helpers.coord2int(lng) - 1, Helpers.coord2int(intersection_in), x_longs, y_longs) shortcuts_for_line.add([x_shortcut(lng) - 1, y_shortcut(intersection_in)]) end # the right shortcut is always selected shortcuts_for_line.add([x_shortcut(lng), y_shortcut(intersection_in)]) else # add all the shortcuts for the whole found area of intersection possible_x_shortcut = x_shortcut(lng) # both shortcuts should only be selected when the polygon doesnt stays on the border middle = intersection_in + (intersection_out - intersection_in) / 2 if inside_polygon(Helpers.coord2int(lng) - 1, Helpers.coord2int(middle), x_longs, y_longs) while intersection_in < intersection_out possible_latitudes << intersection_in intersection_in += step end possible_latitudes << intersection_out # both shortcuts right and left of the intersection should be selected! possible_x_shortcut_min1 = possible_x_shortcut - 1 possible_latitudes.each do |possible_latitude| shortcuts_for_line.add([possible_x_shortcut, y_shortcut(possible_latitude)]) shortcuts_for_line.add([possible_x_shortcut_min1, y_shortcut(possible_latitude)]) end else while intersection_in < intersection_out possible_latitudes << intersection_in intersection_in += step end # only the shortcut right of the intersection should be selected! possible_latitudes << intersection_out possible_latitudes.each do |possible_latitude| shortcuts_for_line.add([possible_x_shortcut, y_shortcut(possible_latitude)]) end end end end end shortcuts_for_line end def construct_shortcuts(shortcuts) puts('building shortcuts...') puts('currently in line:') line = 0 @boundaries.each do |xmax, xmin, ymax, ymin| # xmax, xmin, ymax, ymin = boundaries_of(line=line) if line % 1000 == 0 puts("line #{line}") # puts([xmax, xmin, ymax, ymin]) end column_nrs = included_shortcut_column_nrs(xmax, xmin) row_nrs = included_shortcut_row_nrs(ymax, ymin) if big_zone(xmax, xmin, ymax, ymin) <<EOT puts("line #{line}") puts('This is a big zone! computing exact shortcuts') puts('Nr of entries before') puts(len(column_nrs) * row_nrs.length) puts('columns and rows before optimisation:') puts(column_nrs) puts(row_nrs) EOT # This is a big zone! compute exact shortcuts with the whole polygon points shortcuts_for_line = compute_exact_shortcuts(xmax, xmin, ymax, ymin, line) # n += shortcuts_for_line.length <<EOT accurracy = 1000000000000 while len(shortcuts_for_line) < 3 and accurracy > 10000000000 shortcuts_for_line = compute_exact_shortcuts(line=i,accurracy) accurracy = (accurracy/10).to_i end EOT min_x_shortcut = column_nrs[0] max_x_shortcut = column_nrs[-1] min_y_shortcut = row_nrs[0] max_y_shortcut = row_nrs[-1] shortcuts_to_remove = [] # remove shortcuts from outside the possible/valid area shortcuts_for_line.each do |x, y| shortcuts_to_remove << [x, y] if x < min_x_shortcut shortcuts_to_remove << [x, y] if x > max_x_shortcut shortcuts_to_remove << [x, y] if y < min_y_shortcut shortcuts_to_remove << [x, y] if y > max_y_shortcut end shortcuts_to_remove.each do |s| shortcuts_for_line.delete(s) end <<EOT puts('and after:') puts(shortcuts_for_line.length) column_nrs_after = Set.new row_nrs_after = Set.new shortcuts_for_line.each do |x, y| column_nrs_after.add(x) row_nrs_after.add(y) end puts(column_nrs_after) puts(row_nrs_after) puts(shortcuts_for_line) EOT if shortcuts_for_line.length > column_nrs.length * row_nrs.length raise 'there are more shortcuts than before now. there is something wrong with the algorithm!' end if shortcuts_for_line.length < 3 raise 'algorithm not valid! less than 3 zones detected (should be at least 4)' end else shortcuts_for_line = [] column_nrs.each do |column_nr| row_nrs.each do |row_nr| shortcuts_for_line << [column_nr, row_nr] # puts(shortcuts_for_line) end end end shortcuts_for_line.each do |shortcut| shortcuts[shortcut] = shortcuts.fetch(shortcut, []) + [line] end line += 1 # puts('collected entries:') # puts(n) end end # test_length = 0 @ids.each do |id| # test_length += 1 zone_ids << id end # if test_length != @nr_of_lines # raise ArgumentError, "#{test_length} #{@nr_of_lines} #{@ids.length}" # end @all_lengths.each do |length| nr_of_floats += 2 * length end start_time = Time.now construct_shortcuts(shortcuts) end_time = Time.now puts("calculating the shortcuts took: #{end_time - start_time}") # address where the actual polygon data starts. look in the description below to get more info polygon_address = (24 * @nr_of_lines + 12) # for every original float now 4 bytes are needed (int32) shortcut_start_address = polygon_address + 4 * nr_of_floats # write number of entries in shortcut field (x,y) nr_of_entries_in_shortcut = [] shortcut_entries = [] amount_filled_shortcuts = 0 # count how many shortcut addresses will be written: (0...(360 * NR_SHORTCUTS_PER_LNG)).each do |x| (0...(180 * NR_SHORTCUTS_PER_LAT)).each do |y| begin this_lines_shortcuts = shortcuts.fetch([x, y]) shortcut_entries << this_lines_shortcuts amount_filled_shortcuts += 1 nr_of_entries_in_shortcut << this_lines_shortcuts.length # puts "(#{x}, #{y}, #{this_lines_shortcuts})" rescue KeyError nr_of_entries_in_shortcut << 0 end end end amount_of_shortcuts = nr_of_entries_in_shortcut.length if amount_of_shortcuts != 64_800 * NR_SHORTCUTS_PER_LNG * NR_SHORTCUTS_PER_LAT puts(amount_of_shortcuts) raise ArgumentError, 'this number of shortcut zones is wrong' end puts("number of filled shortcut zones are: #{amount_filled_shortcuts} (=#{(amount_filled_shortcuts.fdiv(amount_of_shortcuts) * 100).round(2)}% of all shortcuts)") # for every shortcut S< and L< is written (nr of entries and address) shortcut_space = 360 * NR_SHORTCUTS_PER_LNG * 180 * NR_SHORTCUTS_PER_LAT * 6 nr_of_entries_in_shortcut.each do |nr| # every line in every shortcut takes up 2bytes shortcut_space += 2 * nr end hole_start_address = shortcut_start_address + shortcut_space puts("The number of polygons is: #{@nr_of_lines}") puts("The number of floats in all the polygons is (2 per point): #{nr_of_floats}") puts("now writing file \"#{path}\"") output_file = open(path, 'wb') # write nr_of_lines output_file.write([@nr_of_lines].pack('S<')) # write start address of shortcut_data: output_file.write([shortcut_start_address].pack('L<')) # S< amount of holes output_file.write([@amount_of_holes].pack('S<')) # L< Address of Hole area (end of shortcut area +1) @ 8 output_file.write([hole_start_address].pack('L<')) # write zone_ids zone_ids.each do |zone_id| output_file.write([zone_id].pack('S<')) end # write number of values @all_lengths.each do |length| output_file.write([length].pack('S<')) end # write polygon_addresses @all_lengths.each do |length| output_file.write([polygon_address].pack('L<')) # data of the next polygon is at the address after all the space the points take # nr of points stored * 2 ints per point * 4 bytes per int polygon_address += 8 * length end if shortcut_start_address != polygon_address # both should be the same! raise 'shortcut_start_address and polygon_address should now be the same!' end # write boundary_data @boundaries.each do |b| output_file.write(b.map { |c| Helpers.coord2int(c) }.pack('l<l<l<l<')) end # write polygon_data @all_coords.each do |x_coords, y_coords| x_coords.each do |x| output_file.write([Helpers.coord2int(x)].pack('l<')) end y_coords.each do |y| output_file.write([Helpers.coord2int(y)].pack('l<')) end end puts("position after writing all polygon data (=start of shortcut section): #{output_file.tell}") # [SHORTCUT AREA] # write all nr of entries nr_of_entries_in_shortcut.each do |nr| raise "There are too many polygons in this shortcuts: #{nr}" if nr > 300 output_file.write([nr].pack('S<')) end # write Address of first Polygon_nr in shortcut field (x,y) # Attention: 0 is written when no entries are in this shortcut shortcut_address = output_file.tell + 259_200 * NR_SHORTCUTS_PER_LNG * NR_SHORTCUTS_PER_LAT nr_of_entries_in_shortcut.each do |nr| if nr == 0 output_file.write([0].pack('L<')) else output_file.write([shortcut_address].pack('L<')) # each line_nr takes up 2 bytes of space shortcut_address += 2 * nr end end # write Line_Nrs for every shortcut shortcut_entries.each do |entries| entries.each do |entry| raise entry if entry > @nr_of_lines output_file.write([entry].pack('S<')) end end # [HOLE AREA, Y = number of holes (very few: around 22)] # 'S<' for every hole store the related line i = 0 @related_line.each do |line| raise ArgumentError, line if line > @nr_of_lines output_file.write([line].pack('S<')) i += 1 end if i > @amount_of_holes raise ArgumentError, 'There are more related lines than holes.' end # 'S<' Y times [H unsigned short: nr of values (coordinate PAIRS! x,y in int32 int32) in this hole] @all_hole_lengths.each do |length| output_file.write([length].pack('S<')) end # 'L<' Y times [ I unsigned int: absolute address of the byte where the data of that hole starts] hole_address = output_file.tell + @amount_of_holes * 4 @all_hole_lengths.each do |length| output_file.write([hole_address].pack('L<')) # each pair of points takes up 8 bytes of space hole_address += 8 * length end # Y times [ 2x i signed ints for every hole: x coords, y coords ] # write hole polygon_data @all_holes.each do |x_coords, y_coords| x_coords.each do |x| output_file.write([Helpers.coord2int(x)].pack('l<')) end y_coords.each do |y| output_file.write([Helpers.coord2int(y)].pack('l<')) end end last_address = output_file.tell hole_space = last_address - hole_start_address if shortcut_space != last_address - shortcut_start_address - hole_space raise ArgumentError, 'shortcut space is computed wrong' end polygon_space = nr_of_floats * 4 puts("the polygon data makes up #{(polygon_space.fdiv(last_address) * 100).round(2)}% of the file") puts("the shortcuts make up #{(shortcut_space.fdiv(last_address) * 100).round(2)}% of the file") puts("the holes make up #{(hole_space.fdiv(last_address) * 100).round(2)}% of the file") puts('Success!') end |
#compute_exact_shortcuts(xmax, xmin, ymax, ymin, line) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 362 def compute_exact_shortcuts(xmax, xmin, ymax, ymin, line) shortcuts_for_line = Set.new # x_longs = binary_reader.x_coords_of(line) longs = ints_of(line) x_longs = longs[0] y_longs = longs[1] # y_longs = binary_reader.y_coords_of(line) y_longs << y_longs[0] x_longs << x_longs[0] step = 1.0 / NR_SHORTCUTS_PER_LAT # puts('checking the latitudes') latitudes_to_check(ymax, ymin).each do |lat| # puts(lat) # puts(coordinate_to_longlong(lat)) # puts(y_longs) # puts(x_intersections(coordinate_to_longlong(lat), x_longs, y_longs)) # raise intersects = x_intersections(Helpers.coord2int(lat), x_longs, y_longs).map do |x| Helpers.int2coord(x) end.sort # puts(intersects.to_s) nr_of_intersects = intersects.length if nr_of_intersects.odd? raise 'an uneven number of intersections has been accounted' end (0...nr_of_intersects).step(2).each do |i| possible_longitudes = [] # collect all the zones between two intersections [in,out,in,out,...] iplus = i + 1 intersection_in = intersects[i] intersection_out = intersects[iplus] if intersection_in == intersection_out # the polygon has a point exactly on the border of a shortcut zone here! # only select the top shortcut if it is actually inside the polygon (point a little up is inside) if inside_polygon(Helpers.coord2int(intersection_in), Helpers.coord2int(lat) + 1, x_longs, y_longs) shortcuts_for_line.add([x_shortcut(intersection_in), y_shortcut(lat) - 1]) end # the bottom shortcut is always selected shortcuts_for_line.add([x_shortcut(intersection_in), y_shortcut(lat)]) else # add all the shortcuts for the whole found area of intersection possible_y_shortcut = y_shortcut(lat) # both shortcuts should only be selected when the polygon doesnt stays on the border middle = intersection_in + (intersection_out - intersection_in) / 2 if inside_polygon(Helpers.coord2int(middle), Helpers.coord2int(lat) + 1, x_longs, y_longs) while intersection_in < intersection_out possible_longitudes << intersection_in intersection_in += step end possible_longitudes << intersection_out # the shortcut above and below of the intersection should be selected! possible_y_shortcut_min1 = possible_y_shortcut - 1 possible_longitudes.each do |possible_x_coord| shortcuts_for_line.add([x_shortcut(possible_x_coord), possible_y_shortcut]) shortcuts_for_line.add([x_shortcut(possible_x_coord), possible_y_shortcut_min1]) end else # polygon does not cross the border! while intersection_in < intersection_out possible_longitudes << intersection_in intersection_in += step end possible_longitudes << intersection_out # only the shortcut above of the intersection should be selected! possible_longitudes.each do |possible_x_coord| shortcuts_for_line.add([x_shortcut(possible_x_coord), possible_y_shortcut]) end end end end end # puts('now all the longitudes to check') # same procedure horizontally step = 1.0 / NR_SHORTCUTS_PER_LAT longitudes_to_check(xmax, xmin).each do |lng| # puts(lng) # puts(coordinate_to_longlong(lng)) # puts(x_longs) # puts(x_intersections(coordinate_to_longlong(lng), x_longs, y_longs)) intersects = y_intersections(Helpers.coord2int(lng), x_longs, y_longs).map do |y| Helpers.int2coord(y) end.sort # puts(intersects) nr_of_intersects = intersects.length if nr_of_intersects.odd? raise 'an uneven number of intersections has been accounted' end possible_latitudes = [] (0...nr_of_intersects).step(2).each do |i| # collect all the zones between two intersections [in,out,in,out,...] iplus = i + 1 intersection_in = intersects[i] intersection_out = intersects[iplus] if intersection_in == intersection_out # the polygon has a point exactly on the border of a shortcut here! # only select the left shortcut if it is actually inside the polygon (point a little left is inside) if inside_polygon(Helpers.coord2int(lng) - 1, Helpers.coord2int(intersection_in), x_longs, y_longs) shortcuts_for_line.add([x_shortcut(lng) - 1, y_shortcut(intersection_in)]) end # the right shortcut is always selected shortcuts_for_line.add([x_shortcut(lng), y_shortcut(intersection_in)]) else # add all the shortcuts for the whole found area of intersection possible_x_shortcut = x_shortcut(lng) # both shortcuts should only be selected when the polygon doesnt stays on the border middle = intersection_in + (intersection_out - intersection_in) / 2 if inside_polygon(Helpers.coord2int(lng) - 1, Helpers.coord2int(middle), x_longs, y_longs) while intersection_in < intersection_out possible_latitudes << intersection_in intersection_in += step end possible_latitudes << intersection_out # both shortcuts right and left of the intersection should be selected! possible_x_shortcut_min1 = possible_x_shortcut - 1 possible_latitudes.each do |possible_latitude| shortcuts_for_line.add([possible_x_shortcut, y_shortcut(possible_latitude)]) shortcuts_for_line.add([possible_x_shortcut_min1, y_shortcut(possible_latitude)]) end else while intersection_in < intersection_out possible_latitudes << intersection_in intersection_in += step end # only the shortcut right of the intersection should be selected! possible_latitudes << intersection_out possible_latitudes.each do |possible_latitude| shortcuts_for_line.add([possible_x_shortcut, y_shortcut(possible_latitude)]) end end end end end shortcuts_for_line end |
#compute_x_intersection(y, x1, x2, y1, y2) ⇒ Object
returns the x intersection from a horizontal line in y with the line from x1,y1 to x1,y2
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# File 'lib/timezone_finder/file_converter.rb', line 303 def compute_x_intersection(y, x1, x2, y1, y2) delta_y = y2 - y1 return x1 if delta_y == 0 ((y - y1) * (x2 - x1)).fdiv(delta_y) + x1 end |
#compute_y_intersection(x, x1, x2, y1, y2) ⇒ Object
returns the y intersection from a vertical line in x with the line from x1,y1 to x1,y2
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# File 'lib/timezone_finder/file_converter.rb', line 310 def compute_y_intersection(x, x1, x2, y1, y2) delta_x = x2 - x1 return x1 if delta_x == 0 ((x - x1) * (y2 - y1)).fdiv(delta_x) + y1 end |
#construct_shortcuts(shortcuts) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 521 def construct_shortcuts(shortcuts) puts('building shortcuts...') puts('currently in line:') line = 0 @boundaries.each do |xmax, xmin, ymax, ymin| # xmax, xmin, ymax, ymin = boundaries_of(line=line) if line % 1000 == 0 puts("line #{line}") # puts([xmax, xmin, ymax, ymin]) end column_nrs = included_shortcut_column_nrs(xmax, xmin) row_nrs = included_shortcut_row_nrs(ymax, ymin) if big_zone(xmax, xmin, ymax, ymin) <<EOT puts("line #{line}") puts('This is a big zone! computing exact shortcuts') puts('Nr of entries before') puts(len(column_nrs) * row_nrs.length) puts('columns and rows before optimisation:') puts(column_nrs) puts(row_nrs) EOT # This is a big zone! compute exact shortcuts with the whole polygon points shortcuts_for_line = compute_exact_shortcuts(xmax, xmin, ymax, ymin, line) # n += shortcuts_for_line.length <<EOT accurracy = 1000000000000 while len(shortcuts_for_line) < 3 and accurracy > 10000000000 shortcuts_for_line = compute_exact_shortcuts(line=i,accurracy) accurracy = (accurracy/10).to_i end EOT min_x_shortcut = column_nrs[0] max_x_shortcut = column_nrs[-1] min_y_shortcut = row_nrs[0] max_y_shortcut = row_nrs[-1] shortcuts_to_remove = [] # remove shortcuts from outside the possible/valid area shortcuts_for_line.each do |x, y| shortcuts_to_remove << [x, y] if x < min_x_shortcut shortcuts_to_remove << [x, y] if x > max_x_shortcut shortcuts_to_remove << [x, y] if y < min_y_shortcut shortcuts_to_remove << [x, y] if y > max_y_shortcut end shortcuts_to_remove.each do |s| shortcuts_for_line.delete(s) end <<EOT puts('and after:') puts(shortcuts_for_line.length) column_nrs_after = Set.new row_nrs_after = Set.new shortcuts_for_line.each do |x, y| column_nrs_after.add(x) row_nrs_after.add(y) end puts(column_nrs_after) puts(row_nrs_after) puts(shortcuts_for_line) EOT if shortcuts_for_line.length > column_nrs.length * row_nrs.length raise 'there are more shortcuts than before now. there is something wrong with the algorithm!' end if shortcuts_for_line.length < 3 raise 'algorithm not valid! less than 3 zones detected (should be at least 4)' end else shortcuts_for_line = [] column_nrs.each do |column_nr| row_nrs.each do |row_nr| shortcuts_for_line << [column_nr, row_nr] # puts(shortcuts_for_line) end end end shortcuts_for_line.each do |shortcut| shortcuts[shortcut] = shortcuts.fetch(shortcut, []) + [line] end line += 1 # puts('collected entries:') # puts(n) end end |
#included_shortcut_column_nrs(max_lng, min_lng) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 269 def included_shortcut_column_nrs(max_lng, min_lng) (x_shortcut(min_lng)..x_shortcut(max_lng)).to_a end |
#included_shortcut_row_nrs(max_lat, min_lat) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 265 def included_shortcut_row_nrs(max_lat, min_lat) (y_shortcut(max_lat)..y_shortcut(min_lat)).to_a end |
#inside_polygon(x, y, x_coords, y_coords) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 67 def inside_polygon(x, y, x_coords, y_coords) def is_left_of(x, y, x1, x2, y1, y2) (x2 - x1) * (y - y1) - (x - x1) * (y2 - y1) end n = y_coords.length - 1 wn = 0 (0...n).each do |i| iplus = i + 1 if y_coords[i] <= y # puts('Y1<=y') if y_coords[iplus] > y # puts('Y2>y') if is_left_of(x, y, x_coords[i], x_coords[iplus], y_coords[i], y_coords[iplus]) > 0 wn += 1 # puts('wn is:') # puts(wn) end end else # puts('Y1>y') if y_coords[iplus] <= y # puts('Y2<=y') if is_left_of(x, y, x_coords[i], x_coords[iplus], y_coords[i], y_coords[iplus]) < 0 wn -= 1 # puts('wn is:') # puts(wn) end end end end wn != 0 end |
#ints_of(line = 0) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 238 def ints_of(line = 0) x_coords, y_coords = @all_coords[line] [x_coords.map { |x| Helpers.coord2int(x) }, y_coords.map { |y| Helpers.coord2int(y) }] end |
#is_left_of(x, y, x1, x2, y1, y2) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 68 def is_left_of(x, y, x1, x2, y1, y2) (x2 - x1) * (y - y1) - (x - x1) * (y2 - y1) end |
#latitudes_to_check(max_lat, min_lat) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 288 def latitudes_to_check(max_lat, min_lat) output_list = [] step = 1.0 / NR_SHORTCUTS_PER_LAT current = (min_lat * NR_SHORTCUTS_PER_LAT).ceil.fdiv(NR_SHORTCUTS_PER_LAT) last = (max_lat * NR_SHORTCUTS_PER_LAT).floor.fdiv(NR_SHORTCUTS_PER_LAT) while current < last output_list << current current += step end output_list << last output_list end |
#longitudes_to_check(max_lng, min_lng) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 273 def longitudes_to_check(max_lng, min_lng) output_list = [] step = 1.0 / NR_SHORTCUTS_PER_LNG current = (min_lng * NR_SHORTCUTS_PER_LNG).ceil.fdiv(NR_SHORTCUTS_PER_LNG) last = (max_lng * NR_SHORTCUTS_PER_LNG).floor.fdiv(NR_SHORTCUTS_PER_LNG) while current < last output_list << current current += step end output_list << last output_list end |
#parse_polygons_from_json(path = 'tz_world.json') ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 102 def parse_polygons_from_json(path = 'tz_world.json') f = open(path, 'r') puts 'Parsing data from .json' puts 'encountered holes at: ' # file_line is the current line in the .json file being parsed. This is not the id of the Polygon! file_line = 0 f.each_line do |row| # puts(row) tz_name_match = /"TZID":\s\"(?<name>.*)"\s\}/.match(row) # tz_name = /(TZID)/.match(row) # puts tz_name if tz_name_match tz_name = tz_name_match['name'].delete('\\') @all_tz_names << tz_name @nr_of_lines += 1 # puts tz_name actual_depth = 0 counted_coordinate_pairs = 0 encountered_nr_of_coordinates = [] row.each_char do |char| if char == '[' actual_depth += 1 elsif char == ']' actual_depth -= 1 if actual_depth == 2 counted_coordinate_pairs += 1 elsif actual_depth == 1 encountered_nr_of_coordinates << counted_coordinate_pairs counted_coordinate_pairs = 0 end end end if actual_depth != 0 raise ArgumentError, "uneven number of brackets detected. Something is wrong in line #{file_line}" end coordinates = row.scan(/[-]?\d+\.?\d+/) sum = encountered_nr_of_coordinates.inject(0) { |a, e| a + e } if coordinates.length != sum * 2 raise ArgumentError, "There number of coordinates is counten wrong: #{coordinates.length} #{sum * 2}" end # TODO: detect and store all the holes in the bin # puts coordinates # nr_floats = coordinates.length x_coords = [] y_coords = [] xmax = -180.0 xmin = 180.0 ymax = -90.0 ymin = 90.0 pointer = 0 # the coordiate pairs within the first brackets [ [x,y], ..., [xn, yn] ] are the polygon coordinates # The last coordinate pair should be left out (is equal to the first one) (0...(2 * (encountered_nr_of_coordinates[0] - 1))).each do |n| if n.even? x = coordinates[pointer].to_f x_coords << x xmax = x if x > xmax xmin = x if x < xmin else y = coordinates[pointer].to_f y_coords << y ymax = y if y > ymax ymin = y if y < ymin end pointer += 1 end @all_coords << [x_coords, y_coords] @all_lengths << x_coords.length # puts(x_coords) # puts(y_coords) @boundaries << [xmax, xmin, ymax, ymin] amount_holes_this_line = encountered_nr_of_coordinates.length - 1 if amount_holes_this_line > 0 # store how many holes there are in this line # store what the number of the first hole for this line is (for calculating the address to jump) @first_hole_id_in_line << @amount_of_holes # keep track of how many holes there are @amount_of_holes += amount_holes_this_line puts(tz_name) (0...amount_holes_this_line).each do |_i| @related_line << @nr_of_lines puts(@nr_of_lines) # puts(amount_holes_this_line) end end # for every encountered hole (1...(amount_holes_this_line + 1)).each do |i| x_coords = [] y_coords = [] # since the last coordinate was being left out, # we have to move the pointer 2 floats further to be in the hole data again pointer += 2 # The last coordinate pair should be left out (is equal to the first one) (0...(2 * (encountered_nr_of_coordinates[i] - 1))).each do |n| if n.even? x_coords << coordinates[pointer].to_f else y_coords << coordinates[pointer].to_f end pointer += 1 end @all_holes << [x_coords, y_coords] @all_hole_lengths << x_coords.length end end file_line += 1 end # so far the nr_of_lines was used to point to the current polygon but there is actually 1 more polygons in total @nr_of_lines += 1 puts("amount_of_holes: #{@amount_of_holes}") puts("amount of timezones: #{@nr_of_lines}") puts("Done\n\n") end |
#update_zone_names(path = 'timezone_names.rb') ⇒ Object
TODO :return:
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# File 'lib/timezone_finder/file_converter.rb', line 39 def update_zone_names(path = 'timezone_names.rb') puts('updating the zone names now') unique_zones = [] @all_tz_names.each do |zone_name| unique_zones << zone_name if unique_zones.index(zone_name).nil? end unique_zones.sort! @all_tz_names.each do |zone_name| # the ids of the polygons have to be set correctly @ids << unique_zones.index(zone_name) end # write all unique zones into the file at path with the syntax of a ruby array file = open(path, 'w') file.write("module TimezoneFinder\n") file.write(" TIMEZONE_NAMES = [\n") unique_zones.each do |zone_name| file.write(" '#{zone_name}',\n") end file.write(" ].freeze\n") file.write("end\n") puts("Done\n\n") end |
#x_intersections(y, x_coords, y_coords) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 316 def x_intersections(y, x_coords, y_coords) # puts(x_coords.to_s) # puts(y) # puts(y_coords.to_s) intersects = [] (0...(y_coords.length - 1)).each do |i| iplus1 = i + 1 if y_coords[i] <= y # puts('Y1<=y') if y_coords[iplus1] > y # this was a crossing. compute the intersect # puts('Y2>y') intersects << compute_x_intersection(y, x_coords[i], x_coords[iplus1], y_coords[i], y_coords[iplus1]) end else # puts('Y1>y') if y_coords[iplus1] <= y # this was a crossing. compute the intersect # puts('Y2<=y') intersects << compute_x_intersection(y, x_coords[i], x_coords[iplus1], y_coords[i], y_coords[iplus1]) end end end intersects end |
#x_shortcut(lng) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 248 def x_shortcut(lng) # puts lng if lng < -180 or lng >= 180 # raise 'longitude out of bounds' ((lng + 180) * NR_SHORTCUTS_PER_LNG).floor end |
#y_intersections(x, x_coords, y_coords) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 343 def y_intersections(x, x_coords, y_coords) intersects = [] (0...(y_coords.length - 1)).each do |i| iplus1 = i + 1 if x_coords[i] <= x if x_coords[iplus1] > x # this was a crossing. compute the intersect intersects << compute_y_intersection(x, x_coords[i], x_coords[iplus1], y_coords[i], y_coords[iplus1]) end else if x_coords[iplus1] <= x # this was a crossing. compute the intersect intersects << compute_y_intersection(x, x_coords[i], x_coords[iplus1], y_coords[i], y_coords[iplus1]) end end end intersects end |
#y_shortcut(lat) ⇒ Object
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# File 'lib/timezone_finder/file_converter.rb', line 254 def y_shortcut(lat) # puts lat if lat < -90 or lat >= 90 # raise 'this latitude is out of bounds' ((90 - lat) * NR_SHORTCUTS_PER_LAT).floor end |