app/controllers/swf_controller.rb

   1 class SwfController < ApplicationController
   2   before_filter :check_availability
   3
   4 # to log:
   5 # RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
   6 # $log.puts Time.new.to_s+','+Time.new.usec.to_s+": started GPS script"
   7 # 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
   8
   9         # ====================================================================
  10         # Public methods
  11
  12         # ---- trackpoints      compile SWF of trackpoints
  13
  14         def trackpoints
  15
  16                 # -     Initialise
  17
  18                 baselong        =params['baselong'].to_f
  19                 basey           =params['basey'].to_f
  20                 masterscale     =params['masterscale'].to_f
  21
  22                 xmin=params['xmin'].to_f; xminr=xmin/0.000001
  23                 xmax=params['xmax'].to_f; xmaxr=xmax/0.000001
  24                 ymin=params['ymin'].to_f; yminr=ymin/0.000001
  25                 ymax=params['ymax'].to_f; ymaxr=ymax/0.000001
  26
  27                 # -     Begin movie
  28
  29                 bounds_left  =0
  30                 bounds_right =320*20
  31                 bounds_bottom=0
  32                 bounds_top   =240*20
  33
  34                 m =''
  35                 m+=swfRecord(9,255.chr + 155.chr + 155.chr)                     #ÊBackground
  36                 absx=0
  37                 absy=0
  38                 xl=yb= 9999999
  39                 xr=yt=-9999999
  40
  41                 # -     Send SQL for GPS tracks
  42
  43                 b=''
  44                 lasttime=0
  45                 lastfile='-1'
  46
  47                 if params['token']
  48                         token=sqlescape(params['token'])
  49                         sql="SELECT gps_points.latitude*0.000001 AS lat,gps_points.longitude*0.000001 AS lon,gpx_files.id AS fileid,UNIX_TIMESTAMP(gps_points.timestamp) AS ts "+
  50                                  " FROM gpx_files,gps_points,users "+
  51                                  "WHERE gpx_files.id=gpx_id "+
  52                                  "  AND gpx_files.user_id=users.id "+
  53                                  "  AND token='#{token}' "+
  54                                  "  AND (gps_points.longitude BETWEEN #{xminr} AND #{xmaxr}) "+
  55                                  "  AND (gps_points.latitude BETWEEN #{yminr} AND #{ymaxr}) "+
  56                                  "  AND (gps_points.timestamp IS NOT NULL) "+
  57                                  "ORDER BY fileid DESC,ts "+
  58                                  "LIMIT 10000"
  59                 else
  60                         sql="SELECT latitude*0.000001 AS lat,longitude*0.000001 AS lon,gpx_id AS fileid,UNIX_TIMESTAMP(timestamp) AS ts "+
  61                                  " FROM gps_points "+
  62                                  "WHERE (longitude BETWEEN #{xminr} AND #{xmaxr}) "+
  63                                  "  AND (latitude  BETWEEN #{yminr} AND #{ymaxr}) "+
  64                                  "  AND (gps_points.timestamp IS NOT NULL) "+
  65                                  "ORDER BY fileid DESC,ts "+
  66                                  "LIMIT 10000"
  67                 end
  68                 gpslist=ActiveRecord::Base.connection.select_all sql
  69
  70                 # - Draw GPS trace lines
  71
  72                 r=startShape()
  73                 gpslist.each do |row|
  74                         xs=(long2coord(row['lon'].to_f,baselong,masterscale)*20).floor
  75                         ys=(lat2coord(row['lat'].to_f ,basey   ,masterscale)*20).floor
  76                         xl=[xs,xl].min; xr=[xs,xr].max
  77                         yb=[ys,yb].min; yt=[ys,yt].max
  78                         if (row['ts'].to_i-lasttime<180 and row['fileid']==lastfile)
  79                                 b+=drawTo(absx,absy,xs,ys)
  80                         else
  81                                 b+=startAndMove(xs,ys,'01')
  82                         end
  83                         absx=xs.floor; absy=ys.floor
  84                         lasttime=row['ts'].to_i
  85                         lastfile=row['fileid']
  86                         while b.length>80 do
  87                                 r+=[b.slice!(0...80)].pack("B*")
  88                         end
  89                 end
  90
  91                 # - Draw unwayed segments
  92
  93                 if params['unwayed']=='true'
  94                         sql="SELECT cn1.latitude AS lat1,cn1.longitude AS lon1,"+
  95                                 "               cn2.latitude AS lat2,cn2.longitude AS lon2 "+
  96                                 "  FROM current_segments "+
  97                                 "       LEFT OUTER JOIN current_way_segments"+
  98                                 "       ON segment_id=current_segments.id,"+
  99                                 "       current_nodes AS cn1,current_nodes AS cn2"+
 100                                 " WHERE (cn1.longitude BETWEEN #{xmin} AND #{xmax})"+
 101                                 "   AND (cn1.latitude  BETWEEN #{ymin} AND #{ymax})"+
 102                                 "   AND segment_id IS NULL"+
 103                                 "   AND current_segments.visible=1"+
 104                                 "   AND cn1.id=node_a AND cn1.visible=1"+
 105                                 "   AND cn2.id=node_b AND cn2.visible=1"
 106                         seglist=ActiveRecord::Base.connection.select_all sql
 107
 108                         seglist.each do |row|
 109                                 xs1=(long2coord(row['lon1'].to_f,baselong,masterscale)*20).floor; ys1=(lat2coord(row['lat1'].to_f,basey,masterscale)*20).floor
 110                                 xs2=(long2coord(row['lon2'].to_f,baselong,masterscale)*20).floor; ys2=(lat2coord(row['lat2'].to_f,basey,masterscale)*20).floor
 111                                 if (xs1==absx and ys1==absy)
 112                                         b+=drawTo(absx,absy,xs2,ys2)
 113                                         absx=xs2; absy=ys2
 114                                 elsif (xs2==absx and ys2==absy)
 115                                         b+=drawTo(absx,absy,xs1,ys1)
 116                                         absx=xs1; absy=ys1
 117                                 else
 118                                         b+=startAndMove(xs1,ys1,'10')
 119                                         b+=drawTo(xs1,ys1,xs2,ys2)
 120                                         absx=xs2; absy=ys2
 121                                 end
 122                                 while b.length>80 do
 123                                         r+=[b.slice!(0...80)].pack("B*")
 124                                 end
 125                         end
 126                 end
 127
 128                 # - Write shape
 129
 130                 b+=endShape()
 131                 r+=[b].pack("B*")
 132                 m+=swfRecord(2,packUI16(1) + packRect(xl,xr,yb,yt) + r)
 133                 m+=swfRecord(4,packUI16(1) + packUI16(1))
 134
 135                 # -     Create Flash header and write to browser
 136
 137                 m+=swfRecord(1,'')                                                                      # Show frame
 138                 m+=swfRecord(0,'')                                                                      # End
 139
 140                 m=packRect(bounds_left,bounds_right,bounds_bottom,bounds_top) + 0.chr + 12.chr + packUI16(1) + m
 141                 m='FWS' + 6.chr + packUI32(m.length+8) + m
 142
 143                 render :text => m, :content_type => "application/x-shockwave-flash"
 144         end
 145
 146         private
 147
 148         # =======================================================================
 149         # SWF functions
 150
 151         # -----------------------------------------------------------------------
 152         # Line-drawing
 153
 154         def startShape
 155                 s =0.chr                                                                                # No fill styles
 156                 s+=2.chr                                                                                # Two line styles
 157                 s+=packUI16(5) + 0.chr + 255.chr + 255.chr              # Width 5, RGB #00FFFF
 158                 s+=packUI16(5) + 255.chr + 0.chr + 255.chr              # Width 5, RGB #FF00FF
 159                 s+=34.chr                                                                               # 2 fill, 2 line index bits
 160                 s
 161         end
 162
 163         def endShape
 164                 '000000'
 165         end
 166
 167         def startAndMove(x,y,col)
 168                 d='001001'                                                                              # Line style change, moveTo
 169                 l =[lengthSB(x),lengthSB(y)].max
 170                 d+=sprintf("%05b%0#{l}b%0#{l}b",l,x,y)
 171                 d+=col                                                                                  # Select line style
 172         end
 173
 174         def drawTo(absx,absy,x,y)
 175                 d='11'                                                                                  # TypeFlag, EdgeFlag
 176                 dx=x-absx
 177                 dy=y-absy
 178
 179                 l =[lengthSB(dx),lengthSB(dy)].max
 180                 d+=sprintf("%04b",l-2)
 181                 d+='1'                                                                                  # GeneralLine
 182                 d+=sprintf("%0#{l}b%0#{l}b",dx,dy)
 183         end
 184
 185         # -----------------------------------------------------------------------
 186         # Specific data types
 187
 188         def swfRecord(id,r)
 189                 if r.length>62
 190                         return packUI16((id<<6)+0x3F) + packUI32(r.length) + r
 191                 else
 192                         return packUI16((id<<6)+r.length) + r
 193                 end
 194         end
 195
 196         def packRect(a,b,c,d)
 197                 l=[lengthSB(a),
 198                    lengthSB(b),
 199                    lengthSB(c),
 200                    lengthSB(d)].max
 201                 n=sprintf("%05b%0#{l}b%0#{l}b%0#{l}b%0#{l}b",l,a,b,c,d)
 202                 [n].pack("B*")
 203         end
 204
 205         # -----------------------------------------------------------------------
 206         # Generic pack functions
 207
 208         def packUI16(n)
 209                 [n.floor].pack("v")
 210         end
 211
 212         def packUI32(n)
 213                 [n.floor].pack("V")
 214         end
 215
 216         # Find number of bits required to store arbitrary-length binary
 217
 218         def lengthSB(n)
 219                 Math.frexp(n+ (n==0?1:0) )[1]+1
 220         end
 221
 222         # ====================================================================
 223         # Co-ordinate conversion
 224         # (this is duplicated from amf_controller, should probably share)
 225
 226         def lat2coord(a,basey,masterscale)
 227                 -(lat2y(a)-basey)*masterscale+250
 228         end
 229
 230         def long2coord(a,baselong,masterscale)
 231                 (a-baselong)*masterscale+350
 232         end
 233
 234         def lat2y(a)
 235                 180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
 236         end
 237
 238         def sqlescape(a)
 239                 a.gsub("'","''").gsub(92.chr,92.chr+92.chr)
 240         end
 241
 242 end