349413a520
the SWF queries which sometimes reference more than one table with columns named latitude and longitude.
240 lines
6.6 KiB
Ruby
240 lines
6.6 KiB
Ruby
class SwfController < ApplicationController
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session :off
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before_filter :check_availability
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# to log:
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# RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
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# $log.puts Time.new.to_s+','+Time.new.usec.to_s+": started GPS script"
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# 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
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# ====================================================================
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# Public methods
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# ---- trackpoints compile SWF of trackpoints
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def trackpoints
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# - Initialise
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baselong =params['baselong'].to_f
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basey =params['basey'].to_f
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masterscale =params['masterscale'].to_f
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xmin=params['xmin'].to_f;
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xmax=params['xmax'].to_f;
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ymin=params['ymin'].to_f;
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ymax=params['ymax'].to_f;
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# - Begin movie
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bounds_left =0
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bounds_right =320*20
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bounds_bottom=0
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bounds_top =240*20
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m =''
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m+=swfRecord(9,255.chr + 155.chr + 155.chr) #ÊBackground
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absx=0
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absy=0
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xl=yb= 9999999
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xr=yt=-9999999
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# - Send SQL for GPS tracks
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b=''
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lasttime=0
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lastfile='-1'
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if params['token']
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user=User.authenticate(:token => params[:token])
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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 "+
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" FROM gpx_files,gps_points "+
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"WHERE gpx_files.id=gpx_id "+
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" AND gpx_files.user_id=#{user.id} "+
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" AND "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"gps_points.")+
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" AND (gps_points.timestamp IS NOT NULL) "+
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"ORDER BY fileid DESC,ts "+
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"LIMIT 10000"
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else
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sql="SELECT latitude*0.000001 AS lat,longitude*0.000001 AS lon,gpx_id AS fileid,UNIX_TIMESTAMP(timestamp) AS ts "+
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" FROM gps_points "+
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"WHERE "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"gps_points.")+
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" AND (gps_points.timestamp IS NOT NULL) "+
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"ORDER BY fileid DESC,ts "+
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"LIMIT 10000"
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end
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gpslist=ActiveRecord::Base.connection.select_all sql
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# - Draw GPS trace lines
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r=startShape()
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gpslist.each do |row|
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xs=(long2coord(row['lon'].to_f,baselong,masterscale)*20).floor
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ys=(lat2coord(row['lat'].to_f ,basey ,masterscale)*20).floor
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xl=[xs,xl].min; xr=[xs,xr].max
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yb=[ys,yb].min; yt=[ys,yt].max
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if (row['ts'].to_i-lasttime<180 and row['fileid']==lastfile)
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b+=drawTo(absx,absy,xs,ys)
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else
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b+=startAndMove(xs,ys,'01')
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end
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absx=xs.floor; absy=ys.floor
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lasttime=row['ts'].to_i
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lastfile=row['fileid']
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while b.length>80 do
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r+=[b.slice!(0...80)].pack("B*")
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end
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end
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# - Draw unwayed segments
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if params['unwayed']=='true'
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sql="SELECT cn1.latitude AS lat1,cn1.longitude AS lon1,"+
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" cn2.latitude AS lat2,cn2.longitude AS lon2 "+
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" FROM current_segments "+
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" LEFT OUTER JOIN current_way_segments"+
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" ON segment_id=current_segments.id,"+
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" current_nodes AS cn1,current_nodes AS cn2"+
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" WHERE (cn1.longitude BETWEEN #{xmin} AND #{xmax})"+
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" AND (cn1.latitude BETWEEN #{ymin} AND #{ymax})"+
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" AND segment_id IS NULL"+
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" AND current_segments.visible=1"+
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" AND cn1.id=node_a AND cn1.visible=1"+
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" AND cn2.id=node_b AND cn2.visible=1"
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seglist=ActiveRecord::Base.connection.select_all sql
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seglist.each do |row|
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xs1=(long2coord(row['lon1'].to_f,baselong,masterscale)*20).floor; ys1=(lat2coord(row['lat1'].to_f,basey,masterscale)*20).floor
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xs2=(long2coord(row['lon2'].to_f,baselong,masterscale)*20).floor; ys2=(lat2coord(row['lat2'].to_f,basey,masterscale)*20).floor
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if (xs1==absx and ys1==absy)
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b+=drawTo(absx,absy,xs2,ys2)
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absx=xs2; absy=ys2
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elsif (xs2==absx and ys2==absy)
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b+=drawTo(absx,absy,xs1,ys1)
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absx=xs1; absy=ys1
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else
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b+=startAndMove(xs1,ys1,'10')
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b+=drawTo(xs1,ys1,xs2,ys2)
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absx=xs2; absy=ys2
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end
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while b.length>80 do
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r+=[b.slice!(0...80)].pack("B*")
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end
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end
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end
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# - Write shape
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b+=endShape()
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r+=[b].pack("B*")
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m+=swfRecord(2,packUI16(1) + packRect(xl,xr,yb,yt) + r)
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m+=swfRecord(4,packUI16(1) + packUI16(1))
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# - Create Flash header and write to browser
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m+=swfRecord(1,'') # Show frame
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m+=swfRecord(0,'') # End
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m=packRect(bounds_left,bounds_right,bounds_bottom,bounds_top) + 0.chr + 12.chr + packUI16(1) + m
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m='FWS' + 6.chr + packUI32(m.length+8) + m
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render :text => m, :content_type => "application/x-shockwave-flash"
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end
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private
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# =======================================================================
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# SWF functions
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# -----------------------------------------------------------------------
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# Line-drawing
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def startShape
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s =0.chr # No fill styles
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s+=2.chr # Two line styles
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s+=packUI16(5) + 0.chr + 255.chr + 255.chr # Width 5, RGB #00FFFF
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s+=packUI16(5) + 255.chr + 0.chr + 255.chr # Width 5, RGB #FF00FF
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s+=34.chr # 2 fill, 2 line index bits
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s
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end
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def endShape
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'000000'
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end
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def startAndMove(x,y,col)
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d='001001' # Line style change, moveTo
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l =[lengthSB(x),lengthSB(y)].max
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d+=sprintf("%05b%0#{l}b%0#{l}b",l,x,y)
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d+=col # Select line style
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end
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def drawTo(absx,absy,x,y)
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d='11' # TypeFlag, EdgeFlag
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dx=x-absx
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dy=y-absy
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l =[lengthSB(dx),lengthSB(dy)].max
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d+=sprintf("%04b",l-2)
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d+='1' # GeneralLine
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d+=sprintf("%0#{l}b%0#{l}b",dx,dy)
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end
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# -----------------------------------------------------------------------
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# Specific data types
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def swfRecord(id,r)
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if r.length>62
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return packUI16((id<<6)+0x3F) + packUI32(r.length) + r
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else
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return packUI16((id<<6)+r.length) + r
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end
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end
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def packRect(a,b,c,d)
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l=[lengthSB(a),
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lengthSB(b),
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lengthSB(c),
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lengthSB(d)].max
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n=sprintf("%05b%0#{l}b%0#{l}b%0#{l}b%0#{l}b",l,a,b,c,d)
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[n].pack("B*")
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end
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# -----------------------------------------------------------------------
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# Generic pack functions
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def packUI16(n)
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[n.floor].pack("v")
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end
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def packUI32(n)
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[n.floor].pack("V")
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end
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# Find number of bits required to store arbitrary-length binary
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def lengthSB(n)
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Math.frexp(n+ (n==0?1:0) )[1]+1
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end
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# ====================================================================
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# Co-ordinate conversion
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# (this is duplicated from amf_controller, should probably share)
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def lat2coord(a,basey,masterscale)
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-(lat2y(a)-basey)*masterscale+250
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end
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def long2coord(a,baselong,masterscale)
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(a-baselong)*masterscale+350
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end
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def lat2y(a)
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180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
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end
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def sqlescape(a)
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a.gsub("'","''").gsub(92.chr,92.chr+92.chr)
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end
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end
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