Merge rails_port as of r4613 & fix tests.
[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;
24                 xmax=params['xmax'].to_f;
25                 ymin=params['ymin'].to_f;
26                 ymax=params['ymax'].to_f;
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                         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,UNIX_TIMESTAMP(gps_points.timestamp) AS ts "+
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,UNIX_TIMESTAMP(timestamp) AS ts "+
60                                  " FROM gps_points "+
61                                  "WHERE "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"gps_points.")+
62                                  "  AND (gps_points.timestamp IS NOT NULL) "+
63                                  "ORDER BY fileid DESC,ts "+
64                                  "LIMIT 10000"
65                 end
66                 gpslist=ActiveRecord::Base.connection.select_all sql
67         
68                 # - Draw GPS trace lines
69         
70                 r=startShape()
71                 gpslist.each do |row|
72                         xs=(long2coord(row['lon'].to_f,baselong,masterscale)*20).floor
73                         ys=(lat2coord(row['lat'].to_f ,basey   ,masterscale)*20).floor
74                         xl=[xs,xl].min; xr=[xs,xr].max
75                         yb=[ys,yb].min; yt=[ys,yt].max
76                         if (row['ts'].to_i-lasttime<180 and row['fileid']==lastfile)
77                                 b+=drawTo(absx,absy,xs,ys)
78                         else
79                                 b+=startAndMove(xs,ys,'01')
80                         end
81                         absx=xs.floor; absy=ys.floor
82                         lasttime=row['ts'].to_i
83                         lastfile=row['fileid']
84                         while b.length>80 do
85                                 r+=[b.slice!(0...80)].pack("B*")
86                         end
87                 end
88                 
89                 # - Draw unwayed segments
90                 
91                 if params['unwayed']=='true'
92                         sql="SELECT cn1.latitude AS lat1,cn1.longitude AS lon1,"+
93                                 "               cn2.latitude AS lat2,cn2.longitude AS lon2 "+
94                                 "  FROM current_segments "+
95                                 "       LEFT OUTER JOIN current_way_nodes"+
96                                 "       ON segment_id=current_segments.id,"+
97                                 "       current_nodes AS cn1,current_nodes AS cn2"+
98                                 " WHERE (cn1.longitude BETWEEN #{xmin} AND #{xmax})"+
99                                 "   AND (cn1.latitude  BETWEEN #{ymin} AND #{ymax})"+
100                                 "   AND segment_id IS NULL"+
101                                 "   AND current_segments.visible=1"+
102                                 "   AND cn1.id=node_a AND cn1.visible=1"+
103                                 "   AND cn2.id=node_b AND cn2.visible=1"
104                         seglist=ActiveRecord::Base.connection.select_all sql
105                         
106                         seglist.each do |row|
107                                 xs1=(long2coord(row['lon1'].to_f,baselong,masterscale)*20).floor; ys1=(lat2coord(row['lat1'].to_f,basey,masterscale)*20).floor
108                                 xs2=(long2coord(row['lon2'].to_f,baselong,masterscale)*20).floor; ys2=(lat2coord(row['lat2'].to_f,basey,masterscale)*20).floor
109                                 if (xs1==absx and ys1==absy)
110                                         b+=drawTo(absx,absy,xs2,ys2)
111                                         absx=xs2; absy=ys2
112                                 elsif (xs2==absx and ys2==absy)
113                                         b+=drawTo(absx,absy,xs1,ys1)
114                                         absx=xs1; absy=ys1
115                                 else
116                                         b+=startAndMove(xs1,ys1,'10')
117                                         b+=drawTo(xs1,ys1,xs2,ys2)
118                                         absx=xs2; absy=ys2
119                                 end
120                                 while b.length>80 do
121                                         r+=[b.slice!(0...80)].pack("B*")
122                                 end
123                         end
124                 end
125         
126                 # - Write shape
127         
128                 b+=endShape()
129                 r+=[b].pack("B*")
130                 m+=swfRecord(2,packUI16(1) + packRect(xl,xr,yb,yt) + r)
131                 m+=swfRecord(4,packUI16(1) + packUI16(1))
132                 
133                 # -     Create Flash header and write to browser
134         
135                 m+=swfRecord(1,'')                                                                      # Show frame
136                 m+=swfRecord(0,'')                                                                      # End
137                 
138                 m=packRect(bounds_left,bounds_right,bounds_bottom,bounds_top) + 0.chr + 12.chr + packUI16(1) + m
139                 m='FWS' + 6.chr + packUI32(m.length+8) + m
140         
141                 render :text => m, :content_type => "application/x-shockwave-flash"
142         end
143
144         private
145
146         # =======================================================================
147         # SWF functions
148         
149         # -----------------------------------------------------------------------
150         # Line-drawing
151
152         def startShape
153                 s =0.chr                                                                                # No fill styles
154                 s+=2.chr                                                                                # Two line styles
155                 s+=packUI16(5) + 0.chr + 255.chr + 255.chr              # Width 5, RGB #00FFFF
156                 s+=packUI16(5) + 255.chr + 0.chr + 255.chr              # Width 5, RGB #FF00FF
157                 s+=34.chr                                                                               # 2 fill, 2 line index bits
158                 s
159         end
160         
161         def endShape
162                 '000000'
163         end
164         
165         def startAndMove(x,y,col)
166                 d='001001'                                                                              # Line style change, moveTo
167                 l =[lengthSB(x),lengthSB(y)].max
168                 d+=sprintf("%05b%0#{l}b%0#{l}b",l,x,y)
169                 d+=col                                                                                  # Select line style
170         end
171         
172         def drawTo(absx,absy,x,y)
173                 d='11'                                                                                  # TypeFlag, EdgeFlag
174                 dx=x-absx
175                 dy=y-absy
176                 
177                 l =[lengthSB(dx),lengthSB(dy)].max
178                 d+=sprintf("%04b",l-2)
179                 d+='1'                                                                                  # GeneralLine
180                 d+=sprintf("%0#{l}b%0#{l}b",dx,dy)
181         end
182
183         # -----------------------------------------------------------------------
184         # Specific data types
185
186         def swfRecord(id,r)
187                 if r.length>62
188                         return packUI16((id<<6)+0x3F) + packUI32(r.length) + r
189                 else
190                         return packUI16((id<<6)+r.length) + r
191                 end
192         end
193
194         def packRect(a,b,c,d)
195                 l=[lengthSB(a),
196                    lengthSB(b),
197                    lengthSB(c),
198                    lengthSB(d)].max
199                 n=sprintf("%05b%0#{l}b%0#{l}b%0#{l}b%0#{l}b",l,a,b,c,d)
200                 [n].pack("B*")
201         end
202
203         # -----------------------------------------------------------------------
204         # Generic pack functions
205         
206         def packUI16(n)
207                 [n.floor].pack("v")
208         end
209         
210         def packUI32(n)
211                 [n.floor].pack("V")
212         end
213         
214         # Find number of bits required to store arbitrary-length binary
215         
216         def lengthSB(n)
217                 Math.frexp(n+ (n==0?1:0) )[1]+1
218         end
219         
220         # ====================================================================
221         # Co-ordinate conversion
222         # (this is duplicated from amf_controller, should probably share)
223         
224         def lat2coord(a,basey,masterscale)
225                 -(lat2y(a)-basey)*masterscale+250
226         end
227         
228         def long2coord(a,baselong,masterscale)
229                 (a-baselong)*masterscale+350
230         end
231         
232         def lat2y(a)
233                 180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
234         end
235
236         def sqlescape(a)
237                 a.gsub("'","''").gsub(92.chr,92.chr+92.chr)
238         end
239
240 end