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