# class SwfController < ApplicationController
#   skip_before_action :verify_authenticity_token
#   before_action :check_api_readable

#   # to log:
#   # RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
#   # $log.puts Time.new.to_s+','+Time.new.usec.to_s+": started GPS script"
#   # http://localhost:3000/api/0.4/swf/trackpoints?xmin=-2.32402605810577&xmax=-2.18386309423859&ymin=52.1546608755772&ymax=52.2272777906895&baselong=-2.25325793066437&basey=61.3948537948532&masterscale=5825.4222222222

#   # ====================================================================
#   # Public methods

#   # ---- trackpoints  compile SWF of trackpoints

#   def trackpoints
#     # -  Initialise

#     baselong = params["baselong"].to_f
#     basey = params["basey"].to_f
#     masterscale = params["masterscale"].to_f

#     bbox = BoundingBox.new(params["xmin"], params["ymin"],
#                            params["xmax"], params["ymax"])
#     start = params["start"].to_i

#     # -  Begin movie

#     bounds_left = 0
#     bounds_right = 320 * 20
#     bounds_bottom = 0
#     bounds_top = 240 * 20

#     m = ""
#     m += swf_record(9, 255.chr + 155.chr + 155.chr) # Background
#     absx = 0
#     absy = 0
#     xl = yb = 9999999
#     xr = yt = -9999999

#     # -  Send SQL for GPS tracks

#     b = ""
#     lasttime = 0
#     lasttrack = lastfile = "-1"

#     if params["token"]
#       user = User.authenticate(:token => params[:token])
#       sql = "SELECT gps_points.latitude*0.0000001 AS lat,gps_points.longitude*0.0000001 AS lon,gpx_files.id AS fileid," + "      EXTRACT(EPOCH FROM gps_points.timestamp) AS ts, gps_points.trackid AS trackid " + " FROM gpx_files,gps_points " + "WHERE gpx_files.id=gpx_id " + "  AND gpx_files.user_id=#{user.id} " + "  AND " + OSM.sql_for_area(bbox, "gps_points.") + "  AND (gps_points.timestamp IS NOT NULL) " + "ORDER BY fileid DESC,ts " + "LIMIT 10000 OFFSET #{start}"
#     else
#       sql = "SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lon,gpx_id AS fileid," + "      EXTRACT(EPOCH FROM timestamp) AS ts, gps_points.trackid AS trackid " + " FROM gps_points " + "WHERE " + OSM.sql_for_area(bbox, "gps_points.") + "  AND (gps_points.timestamp IS NOT NULL) " + "ORDER BY fileid DESC,ts " + "LIMIT 10000 OFFSET #{start}"
#     end
#     gpslist = ActiveRecord::Base.connection.select_all sql

#     # - Draw GPS trace lines

#     r = start_shape
#     gpslist.each do |row|
#       xs = (long2coord(row["lon"].to_f, baselong, masterscale) * 20).floor
#       ys = (lat2coord(row["lat"].to_f, basey, masterscale) * 20).floor
#       xl = [xs, xl].min
#       xr = [xs, xr].max
#       yb = [ys, yb].min
#       yt = [ys, yt].max
#       if row["ts"].to_i - lasttime > 180 || row["fileid"] != lastfile || row["trackid"] != lasttrack # or row['ts'].to_i==lasttime
#         b += start_and_move(xs, ys, "01")
#         absx = xs.floor
#         absy = ys.floor
#       end
#       b += draw_to(absx, absy, xs, ys)
#       absx = xs.floor
#       absy = ys.floor
#       lasttime = row["ts"].to_i
#       lastfile = row["fileid"]
#       lasttrack = row["trackid"]
#       r += [b.slice!(0...80)].pack("B*") while b.length > 80
#     end

#     #   (Unwayed segments removed)

#     # - Write shape

#     b += end_shape
#     r += [b].pack("B*")
#     m += swf_record(2, pack_u16(1) + pack_rect(xl, xr, yb, yt) + r)
#     m += swf_record(4, pack_u16(1) + pack_u16(1))

#     # -  Create Flash header and write to browser

#     m += swf_record(1, "")									# Show frame
#     m += swf_record(0, "")									# End

#     m = pack_rect(bounds_left, bounds_right, bounds_bottom, bounds_top) + 0.chr + 12.chr + pack_u16(1) + m
#     m = "FWS" + 6.chr + pack_u32(m.length + 8) + m

#     render :body => m, :content_type => "application/x-shockwave-flash"
#   end

#   private

#   # =======================================================================
#   # SWF functions

#   # -----------------------------------------------------------------------
#   # Line-drawing

#   def start_shape
#     s = 0.chr                                    # No fill styles
#     s += 2.chr                                   # Two line styles
#     s += pack_u16(0) + 0.chr + 255.chr + 255.chr # Width 5, RGB #00FFFF
#     s += pack_u16(0) + 255.chr + 0.chr + 255.chr # Width 5, RGB #FF00FF
#     s += 34.chr # 2 fill, 2 line index bits
#     s
#   end

#   def end_shape
#     "000000"
#   end

#   def start_and_move(x, y, col)
#     d = "001001"	# Line style change, moveTo
#     l = [length_sb(x), length_sb(y)].max
#     d += format("%05b%0*b%0*b", l, l, x, l, y)
#     d += col # Select line style
#     d
#   end

#   def draw_to(absx, absy, x, y)
#     dx = x - absx
#     dy = y - absy

#     # Split the line up if there's anything>16383, because
#     # that would overflow the 4 bits allowed for length
#     mstep = [dx.abs / 16383, dy.abs / 16383, 1].max.ceil
#     xstep = dx / mstep
#     ystep = dy / mstep
#     d = ""
#     1.upto(mstep).each do
#       d += draw_section(x, y, x + xstep, y + ystep)
#       x += xstep
#       y += ystep
#     end
#     d
#   end

#   def draw_section(x1, y1, x2, y2)
#     d = "11"											# TypeFlag, EdgeFlag
#     dx = x2 - x1
#     dy = y2 - y1
#     l = [length_sb(dx), length_sb(dy)].max
#     d += format("%04b", l - 2)
#     d += "1"											# GeneralLine
#     d += format("%0*b%0*b", l, dx, l, dy)
#     d
#   end

#   # -----------------------------------------------------------------------
#   # Specific data types

#   # SWF data block type

#   def swf_record(id, r)
#     if r.length > 62
#       # Long header: tag id, 0x3F, length
#       pack_u16((id << 6) + 0x3F) + pack_u32(r.length) + r
#     else
#       # Short header: tag id, length
#       pack_u16((id << 6) + r.length) + r
#     end
#   end

#   # SWF RECT type

#   def pack_rect(a, b, c, d)
#     l = [length_sb(a),
#          length_sb(b),
#          length_sb(c),
#          length_sb(d)].max
#     # create binary string (00111001 etc.) - 5-byte length, then bbox
#     n = format("%05b%0*b%0*b%0*b%0*b", l, l, a, l, b, l, c, l, d)
#     # pack into byte string
#     [n].pack("B*")
#   end

#   # -----------------------------------------------------------------------
#   # Generic pack functions

#   def pack_u16(n)
#     [n.floor].pack("v")
#   end

#   def pack_u32(n)
#     [n.floor].pack("V")
#   end

#   # Find number of bits required to store arbitrary-length binary

#   def length_sb(n)
#     Math.frexp(n + (n.zero? ? 1 : 0))[1] + 1
#   end

#   # ====================================================================
#   # Co-ordinate conversion
#   # (this is duplicated from amf_controller, should probably share)

#   def lat2coord(a, basey, masterscale)
#     -(lat2y(a) - basey) * masterscale
#   end

#   def long2coord(a, baselong, masterscale)
#     (a - baselong) * masterscale
#   end

#   def lat2y(a)
#     180 / Math::PI * Math.log(Math.tan(Math::PI / 4 + a * (Math::PI / 180) / 2))
#   end
# end
