Make /user/new handle already logged in users better
[rails.git] / app / controllers / swf_controller.rb
1 class SwfController < ApplicationController
2         skip_before_filter :verify_authenticity_token
3         before_filter :check_api_readable
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         # ====================================================================
12         # Public methods
13         
14         # ---- trackpoints      compile SWF of trackpoints
15
16         def trackpoints 
17         
18                 # -     Initialise
19         
20                 baselong        =params['baselong'].to_f
21                 basey           =params['basey'].to_f
22                 masterscale     =params['masterscale'].to_f
23         
24                 xmin=params['xmin'].to_f;
25                 xmax=params['xmax'].to_f;
26                 ymin=params['ymin'].to_f;
27                 ymax=params['ymax'].to_f;
28                 start=params['start'].to_i;
29         
30                 # -     Begin movie
31         
32                 bounds_left  =0
33                 bounds_right =320*20
34                 bounds_bottom=0
35                 bounds_top   =240*20
36
37                 m =''
38                 m+=swfRecord(9,255.chr + 155.chr + 155.chr)                     # Background
39                 absx=0
40                 absy=0
41                 xl=yb= 9999999
42                 xr=yt=-9999999
43         
44                 # -     Send SQL for GPS tracks
45         
46                 b=''
47                 lasttime=0
48                 lasttrack=lastfile='-1'
49         
50                 if params['token']
51                   user=User.authenticate(:token => params[:token])
52                   sql="SELECT gps_points.latitude*0.0000001 AS lat,gps_points.longitude*0.0000001 AS lon,gpx_files.id AS fileid,"+
53                        "      EXTRACT(EPOCH FROM gps_points.timestamp) AS ts, gps_points.trackid AS trackid "+
54                            " FROM gpx_files,gps_points "+
55                            "WHERE gpx_files.id=gpx_id "+
56                            "  AND gpx_files.user_id=#{user.id} "+
57                            "  AND "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"gps_points.")+
58                            "  AND (gps_points.timestamp IS NOT NULL) "+
59                            "ORDER BY fileid DESC,ts "+
60                            "LIMIT 10000 OFFSET #{start}"
61                   else
62                         sql="SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lon,gpx_id AS fileid,"+
63                              "      EXTRACT(EPOCH FROM timestamp) AS ts, gps_points.trackid AS trackid "+
64                                  " FROM gps_points "+
65                                  "WHERE "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"gps_points.")+
66                                  "  AND (gps_points.timestamp IS NOT NULL) "+
67                                  "ORDER BY fileid DESC,ts "+
68                                  "LIMIT 10000 OFFSET #{start}"
69                 end
70                 gpslist=ActiveRecord::Base.connection.select_all sql
71         
72                 # - Draw GPS trace lines
73         
74                 r=startShape()
75                 gpslist.each do |row|
76                         xs=(long2coord(row['lon'].to_f,baselong,masterscale)*20).floor
77                         ys=(lat2coord(row['lat'].to_f ,basey   ,masterscale)*20).floor
78                         xl=[xs,xl].min; xr=[xs,xr].max
79                         yb=[ys,yb].min; yt=[ys,yt].max
80                         if row['ts'].to_i-lasttime>180 or row['fileid']!=lastfile or row['trackid']!=lasttrack #or row['ts'].to_i==lasttime
81                           b+=startAndMove(xs,ys,'01')
82                           absx=xs.floor; absy=ys.floor
83       end
84                   b+=drawTo(absx,absy,xs,ys)
85                         absx=xs.floor; absy=ys.floor
86                         lasttime=row['ts'].to_i
87                         lastfile=row['fileid']
88                         lasttrack=row['trackid']
89                         while b.length>80 do
90                                 r+=[b.slice!(0...80)].pack("B*")
91                         end
92                 end
93                 
94                 #   (Unwayed segments removed)
95         
96                 # - Write shape
97         
98                 b+=endShape()
99                 r+=[b].pack("B*")
100                 m+=swfRecord(2,packUI16(1) + packRect(xl,xr,yb,yt) + r)
101                 m+=swfRecord(4,packUI16(1) + packUI16(1))
102                 
103                 # -     Create Flash header and write to browser
104         
105                 m+=swfRecord(1,'')                                                                      # Show frame
106                 m+=swfRecord(0,'')                                                                      # End
107                 
108                 m=packRect(bounds_left,bounds_right,bounds_bottom,bounds_top) + 0.chr + 12.chr + packUI16(1) + m
109                 m='FWS' + 6.chr + packUI32(m.length+8) + m
110         
111                 render :text => m, :content_type => "application/x-shockwave-flash"
112         end
113
114         private
115
116         # =======================================================================
117         # SWF functions
118         
119         # -----------------------------------------------------------------------
120         # Line-drawing
121
122         def startShape
123                 s =0.chr                                                                                # No fill styles
124                 s+=2.chr                                                                                # Two line styles
125                 s+=packUI16(0) + 0.chr + 255.chr + 255.chr              # Width 5, RGB #00FFFF
126                 s+=packUI16(0) + 255.chr + 0.chr + 255.chr              # Width 5, RGB #FF00FF
127                 s+=34.chr                                                                               # 2 fill, 2 line index bits
128                 s
129         end
130         
131         def endShape
132                 '000000'
133         end
134         
135         def startAndMove(x,y,col)
136                 d='001001'                                                                              # Line style change, moveTo
137                 l =[lengthSB(x),lengthSB(y)].max
138                 d+=sprintf("%05b%0#{l}b%0#{l}b",l,x,y)
139                 d+=col                                                                                  # Select line style
140         end
141         
142         def drawTo(absx,absy,x,y)
143                 dx=x-absx
144                 dy=y-absy
145
146     # Split the line up if there's anything>16383, because
147     # that would overflow the 4 bits allowed for length
148     mstep=[dx.abs/16383,dy.abs/16383,1].max.ceil
149     xstep=dx/mstep
150     ystep=dy/mstep
151     d=''
152     for i in (1..mstep)
153       d+=drawSection(x,y,x+xstep,y+ystep)
154       x+=xstep
155       y+=ystep
156     end
157     d
158         end
159         
160         def drawSection(x1,y1,x2,y2)
161                 d='11'                                                                                  # TypeFlag, EdgeFlag
162           dx=x2-x1
163           dy=y2-y1
164                 l =[lengthSB(dx),lengthSB(dy)].max
165                 d+=sprintf("%04b",l-2)
166                 d+='1'                                                                                  # GeneralLine
167                 d+=sprintf("%0#{l}b%0#{l}b",dx,dy)
168   end
169
170         # -----------------------------------------------------------------------
171         # Specific data types
172
173   # SWF data block type
174
175         def swfRecord(id,r)
176                 if r.length>62
177       # Long header: tag id, 0x3F, length
178                         return packUI16((id<<6)+0x3F) + packUI32(r.length) + r
179                 else
180       # Short header: tag id, length
181                         return packUI16((id<<6)+r.length) + r
182                 end
183         end
184
185   # SWF RECT type
186
187         def packRect(a,b,c,d)
188                 l=[lengthSB(a),
189                    lengthSB(b),
190                    lengthSB(c),
191                    lengthSB(d)].max
192     # create binary string (00111001 etc.) - 5-byte length, then bbox
193                 n=sprintf("%05b%0#{l}b%0#{l}b%0#{l}b%0#{l}b",l,a,b,c,d)
194     # pack into byte string
195                 [n].pack("B*")
196         end
197
198         # -----------------------------------------------------------------------
199         # Generic pack functions
200         
201         def packUI16(n)
202                 [n.floor].pack("v")
203         end
204         
205         def packUI32(n)
206                 [n.floor].pack("V")
207         end
208         
209         # Find number of bits required to store arbitrary-length binary
210         
211         def lengthSB(n)
212                 Math.frexp(n+ (n==0?1:0) )[1]+1
213         end
214         
215         # ====================================================================
216         # Co-ordinate conversion
217         # (this is duplicated from amf_controller, should probably share)
218         
219         def lat2coord(a,basey,masterscale)
220                 -(lat2y(a)-basey)*masterscale
221         end
222         
223         def long2coord(a,baselong,masterscale)
224                 (a-baselong)*masterscale
225         end
226         
227         def lat2y(a)
228                 180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
229         end
230
231         def sqlescape(a)
232                 a.gsub("'","''").gsub(92.chr,92.chr+92.chr)
233         end
234
235 end