Merging 17824:17845 from trunk to blocking branch.
[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                 start=params['start'].to_i;
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)                     # Background
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                 lasttrack=lastfile='-1'
47         
48                 if params['token']
49                   user=User.authenticate(:token => params[:token])
50                   sql="SELECT gps_points.latitude*0.0000001 AS lat,gps_points.longitude*0.0000001 AS lon,gpx_files.id AS fileid,"+
51                        "      EXTRACT(EPOCH FROM gps_points.timestamp) AS ts, gps_points.trackid AS trackid "+
52                            " FROM gpx_files,gps_points "+
53                            "WHERE gpx_files.id=gpx_id "+
54                            "  AND gpx_files.user_id=#{user.id} "+
55                            "  AND "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"gps_points.")+
56                            "  AND (gps_points.timestamp IS NOT NULL) "+
57                            "ORDER BY fileid DESC,ts "+
58                            "LIMIT 10000 OFFSET #{start}"
59                   else
60                         sql="SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lon,gpx_id AS fileid,"+
61                              "      EXTRACT(EPOCH FROM timestamp) AS ts, gps_points.trackid AS trackid "+
62                                  " FROM gps_points "+
63                                  "WHERE "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"gps_points.")+
64                                  "  AND (gps_points.timestamp IS NOT NULL) "+
65                                  "ORDER BY fileid DESC,ts "+
66                                  "LIMIT 10000 OFFSET #{start}"
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 and row['trackid']==lasttrack and row['ts'].to_i!=lasttime)
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                         lasttrack=row['trackid']
87                         while b.length>80 do
88                                 r+=[b.slice!(0...80)].pack("B*")
89                         end
90                 end
91                 
92                 #   (Unwayed segments removed)
93         
94                 # - Write shape
95         
96                 b+=endShape()
97                 r+=[b].pack("B*")
98                 m+=swfRecord(2,packUI16(1) + packRect(xl,xr,yb,yt) + r)
99                 m+=swfRecord(4,packUI16(1) + packUI16(1))
100                 
101                 # -     Create Flash header and write to browser
102         
103                 m+=swfRecord(1,'')                                                                      # Show frame
104                 m+=swfRecord(0,'')                                                                      # End
105                 
106                 m=packRect(bounds_left,bounds_right,bounds_bottom,bounds_top) + 0.chr + 12.chr + packUI16(1) + m
107                 m='FWS' + 6.chr + packUI32(m.length+8) + m
108         
109                 render :text => m, :content_type => "application/x-shockwave-flash"
110         end
111
112         private
113
114         # =======================================================================
115         # SWF functions
116         
117         # -----------------------------------------------------------------------
118         # Line-drawing
119
120         def startShape
121                 s =0.chr                                                                                # No fill styles
122                 s+=2.chr                                                                                # Two line styles
123                 s+=packUI16(0) + 0.chr + 255.chr + 255.chr              # Width 5, RGB #00FFFF
124                 s+=packUI16(0) + 255.chr + 0.chr + 255.chr              # Width 5, RGB #FF00FF
125                 s+=34.chr                                                                               # 2 fill, 2 line index bits
126                 s
127         end
128         
129         def endShape
130                 '000000'
131         end
132         
133         def startAndMove(x,y,col)
134                 d='001001'                                                                              # Line style change, moveTo
135                 l =[lengthSB(x),lengthSB(y)].max
136                 d+=sprintf("%05b%0#{l}b%0#{l}b",l,x,y)
137                 d+=col                                                                                  # Select line style
138         end
139         
140         def drawTo(absx,absy,x,y)
141                 d='11'                                                                                  # TypeFlag, EdgeFlag
142                 dx=x-absx
143                 dy=y-absy
144                 
145                 l =[lengthSB(dx),lengthSB(dy)].max
146                 d+=sprintf("%04b",l-2)
147                 d+='1'                                                                                  # GeneralLine
148                 d+=sprintf("%0#{l}b%0#{l}b",dx,dy)
149         end
150
151         # -----------------------------------------------------------------------
152         # Specific data types
153
154         def swfRecord(id,r)
155                 if r.length>62
156                         return packUI16((id<<6)+0x3F) + packUI32(r.length) + r
157                 else
158                         return packUI16((id<<6)+r.length) + r
159                 end
160         end
161
162         def packRect(a,b,c,d)
163                 l=[lengthSB(a),
164                    lengthSB(b),
165                    lengthSB(c),
166                    lengthSB(d)].max
167                 n=sprintf("%05b%0#{l}b%0#{l}b%0#{l}b%0#{l}b",l,a,b,c,d)
168                 [n].pack("B*")
169         end
170
171         # -----------------------------------------------------------------------
172         # Generic pack functions
173         
174         def packUI16(n)
175                 [n.floor].pack("v")
176         end
177         
178         def packUI32(n)
179                 [n.floor].pack("V")
180         end
181         
182         # Find number of bits required to store arbitrary-length binary
183         
184         def lengthSB(n)
185                 Math.frexp(n+ (n==0?1:0) )[1]+1
186         end
187         
188         # ====================================================================
189         # Co-ordinate conversion
190         # (this is duplicated from amf_controller, should probably share)
191         
192         def lat2coord(a,basey,masterscale)
193                 -(lat2y(a)-basey)*masterscale
194         end
195         
196         def long2coord(a,baselong,masterscale)
197                 (a-baselong)*masterscale
198         end
199         
200         def lat2y(a)
201                 180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
202         end
203
204         def sqlescape(a)
205                 a.gsub("'","''").gsub(92.chr,92.chr+92.chr)
206         end
207
208 end