Add a flag to allow the API to be placed in read-only mode.
[rails.git] / 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)                     #ƊBackground
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