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[rails.git] / app / controllers / swf_controller.rb
1 class SwfController < ApplicationController
2         before_filter :check_api_readable
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;
23                 xmax=params['xmax'].to_f;
24                 ymin=params['ymin'].to_f;
25                 ymax=params['ymax'].to_f;
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)                     # Background
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                 lasttrack=lastfile='-1'
46         
47                 if params['token']
48                   user=User.authenticate(:token => params[:token])
49                   sql="SELECT gps_points.latitude*0.0000001 AS lat,gps_points.longitude*0.0000001 AS lon,gpx_files.id AS fileid,"+
50                        "      EXTRACT(EPOCH FROM gps_points.timestamp) AS ts, gps_points.trackid AS trackid "+
51                            " FROM gpx_files,gps_points "+
52                            "WHERE gpx_files.id=gpx_id "+
53                            "  AND gpx_files.user_id=#{user.id} "+
54                            "  AND "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"gps_points.")+
55                            "  AND (gps_points.timestamp IS NOT NULL) "+
56                            "ORDER BY fileid DESC,ts "+
57                            "LIMIT 10000"
58                   else
59                         sql="SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lon,gpx_id AS fileid,"+
60                              "      EXTRACT(EPOCH FROM timestamp) AS ts, gps_points.trackid AS trackid "+
61                                  " FROM gps_points "+
62                                  "WHERE "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"gps_points.")+
63                                  "  AND (gps_points.timestamp IS NOT NULL) "+
64                                  "ORDER BY fileid DESC,ts "+
65                                  "LIMIT 10000"
66                 end
67                 gpslist=ActiveRecord::Base.connection.select_all sql
68         
69                 # - Draw GPS trace lines
70         
71                 r=startShape()
72                 gpslist.each do |row|
73                         xs=(long2coord(row['lon'].to_f,baselong,masterscale)*20).floor
74                         ys=(lat2coord(row['lat'].to_f ,basey   ,masterscale)*20).floor
75                         xl=[xs,xl].min; xr=[xs,xr].max
76                         yb=[ys,yb].min; yt=[ys,yt].max
77                         if (row['ts'].to_i-lasttime<180 and row['fileid']==lastfile and row['trackid']==lasttrack and row['ts'].to_i!=lasttime)
78                                 b+=drawTo(absx,absy,xs,ys)
79                         else
80                                 b+=startAndMove(xs,ys,'01')
81                         end
82                         absx=xs.floor; absy=ys.floor
83                         lasttime=row['ts'].to_i
84                         lastfile=row['fileid']
85                         lasttrack=row['trackid']
86                         while b.length>80 do
87                                 r+=[b.slice!(0...80)].pack("B*")
88                         end
89                 end
90                 
91                 #   (Unwayed segments removed)
92         
93                 # - Write shape
94         
95                 b+=endShape()
96                 r+=[b].pack("B*")
97                 m+=swfRecord(2,packUI16(1) + packRect(xl,xr,yb,yt) + r)
98                 m+=swfRecord(4,packUI16(1) + packUI16(1))
99                 
100                 # -     Create Flash header and write to browser
101         
102                 m+=swfRecord(1,'')                                                                      # Show frame
103                 m+=swfRecord(0,'')                                                                      # End
104                 
105                 m=packRect(bounds_left,bounds_right,bounds_bottom,bounds_top) + 0.chr + 12.chr + packUI16(1) + m
106                 m='FWS' + 6.chr + packUI32(m.length+8) + m
107         
108                 render :text => m, :content_type => "application/x-shockwave-flash"
109         end
110
111         private
112
113         # =======================================================================
114         # SWF functions
115         
116         # -----------------------------------------------------------------------
117         # Line-drawing
118
119         def startShape
120                 s =0.chr                                                                                # No fill styles
121                 s+=2.chr                                                                                # Two line styles
122                 s+=packUI16(0) + 0.chr + 255.chr + 255.chr              # Width 5, RGB #00FFFF
123                 s+=packUI16(0) + 255.chr + 0.chr + 255.chr              # Width 5, RGB #FF00FF
124                 s+=34.chr                                                                               # 2 fill, 2 line index bits
125                 s
126         end
127         
128         def endShape
129                 '000000'
130         end
131         
132         def startAndMove(x,y,col)
133                 d='001001'                                                                              # Line style change, moveTo
134                 l =[lengthSB(x),lengthSB(y)].max
135                 d+=sprintf("%05b%0#{l}b%0#{l}b",l,x,y)
136                 d+=col                                                                                  # Select line style
137         end
138         
139         def drawTo(absx,absy,x,y)
140                 d='11'                                                                                  # TypeFlag, EdgeFlag
141                 dx=x-absx
142                 dy=y-absy
143                 
144                 l =[lengthSB(dx),lengthSB(dy)].max
145                 d+=sprintf("%04b",l-2)
146                 d+='1'                                                                                  # GeneralLine
147                 d+=sprintf("%0#{l}b%0#{l}b",dx,dy)
148         end
149
150         # -----------------------------------------------------------------------
151         # Specific data types
152
153         def swfRecord(id,r)
154                 if r.length>62
155                         return packUI16((id<<6)+0x3F) + packUI32(r.length) + r
156                 else
157                         return packUI16((id<<6)+r.length) + r
158                 end
159         end
160
161         def packRect(a,b,c,d)
162                 l=[lengthSB(a),
163                    lengthSB(b),
164                    lengthSB(c),
165                    lengthSB(d)].max
166                 n=sprintf("%05b%0#{l}b%0#{l}b%0#{l}b%0#{l}b",l,a,b,c,d)
167                 [n].pack("B*")
168         end
169
170         # -----------------------------------------------------------------------
171         # Generic pack functions
172         
173         def packUI16(n)
174                 [n.floor].pack("v")
175         end
176         
177         def packUI32(n)
178                 [n.floor].pack("V")
179         end
180         
181         # Find number of bits required to store arbitrary-length binary
182         
183         def lengthSB(n)
184                 Math.frexp(n+ (n==0?1:0) )[1]+1
185         end
186         
187         # ====================================================================
188         # Co-ordinate conversion
189         # (this is duplicated from amf_controller, should probably share)
190         
191         def lat2coord(a,basey,masterscale)
192                 -(lat2y(a)-basey)*masterscale
193         end
194         
195         def long2coord(a,baselong,masterscale)
196                 (a-baselong)*masterscale
197         end
198         
199         def lat2y(a)
200                 180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
201         end
202
203         def sqlescape(a)
204                 a.gsub("'","''").gsub(92.chr,92.chr+92.chr)
205         end
206
207 end