class SwfController < ApplicationController
session :off
before_filter :check_read_availability
# to log:
# RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
# $log.puts Time.new.to_s+','+Time.new.usec.to_s+": started GPS script"
# 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
# ====================================================================
# Public methods
# ---- trackpoints compile SWF of trackpoints
def trackpoints
# - Initialise
baselong =params['baselong'].to_f
basey =params['basey'].to_f
masterscale =params['masterscale'].to_f
xmin=params['xmin'].to_f;
xmax=params['xmax'].to_f;
ymin=params['ymin'].to_f;
ymax=params['ymax'].to_f;
# - Begin movie
bounds_left =0
bounds_right =320*20
bounds_bottom=0
bounds_top =240*20
m =''
m+=swfRecord(9,255.chr + 155.chr + 155.chr) #�Background
absx=0
absy=0
xl=yb= 9999999
xr=yt=-9999999
# - Send SQL for GPS tracks
b=''
lasttime=0
lastfile='-1'
if params['token']
user=User.authenticate(:token => params[:token])
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 "+
" FROM gpx_files,gps_points "+
"WHERE gpx_files.id=gpx_id "+
" AND gpx_files.user_id=#{user.id} "+
" AND "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"gps_points.")+
" AND (gps_points.timestamp IS NOT NULL) "+
"ORDER BY fileid DESC,ts "+
"LIMIT 10000"
else
sql="SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lon,gpx_id AS fileid,UNIX_TIMESTAMP(timestamp) AS ts "+
" FROM gps_points "+
"WHERE "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"gps_points.")+
" AND (gps_points.timestamp IS NOT NULL) "+
"ORDER BY fileid DESC,ts "+
"LIMIT 10000"
end
gpslist=ActiveRecord::Base.connection.select_all sql
# - Draw GPS trace lines
r=startShape()
gpslist.each do |row|
xs=(long2coord(row['lon'].to_f,baselong,masterscale)*20).floor
ys=(lat2coord(row['lat'].to_f ,basey ,masterscale)*20).floor
xl=[xs,xl].min; xr=[xs,xr].max
yb=[ys,yb].min; yt=[ys,yt].max
if (row['ts'].to_i-lasttime<180 and row['fileid']==lastfile)
b+=drawTo(absx,absy,xs,ys)
else
b+=startAndMove(xs,ys,'01')
end
absx=xs.floor; absy=ys.floor
lasttime=row['ts'].to_i
lastfile=row['fileid']
while b.length>80 do
r+=[b.slice!(0...80)].pack("B*")
end
end
# - Draw unwayed segments
if params['unwayed']=='true'
sql="SELECT cn1.latitude*0.0000001 AS lat1,cn1.longitude*0.0000001 AS lon1,"+
" cn2.latitude*0.0000001 AS lat2,cn2.longitude*0.0000001 AS lon2 "+
" FROM current_segments "+
" LEFT OUTER JOIN current_way_nodes"+
" ON segment_id=current_segments.id,"+
" current_nodes AS cn1,current_nodes AS cn2"+
" WHERE "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"cn1.")+
" AND segment_id IS NULL"+
" AND current_segments.visible=1"+
" AND cn1.id=node_a AND cn1.visible=1"+
" AND cn2.id=node_b AND cn2.visible=1"
seglist=ActiveRecord::Base.connection.select_all sql
seglist.each do |row|
xs1=(long2coord(row['lon1'].to_f,baselong,masterscale)*20).floor; ys1=(lat2coord(row['lat1'].to_f,basey,masterscale)*20).floor
xs2=(long2coord(row['lon2'].to_f,baselong,masterscale)*20).floor; ys2=(lat2coord(row['lat2'].to_f,basey,masterscale)*20).floor
if (xs1==absx and ys1==absy)
b+=drawTo(absx,absy,xs2,ys2)
absx=xs2; absy=ys2
elsif (xs2==absx and ys2==absy)
b+=drawTo(absx,absy,xs1,ys1)
absx=xs1; absy=ys1
else
b+=startAndMove(xs1,ys1,'10')
b+=drawTo(xs1,ys1,xs2,ys2)
absx=xs2; absy=ys2
end
while b.length>80 do
r+=[b.slice!(0...80)].pack("B*")
end
end
end
# - Write shape
b+=endShape()
r+=[b].pack("B*")
m+=swfRecord(2,packUI16(1) + packRect(xl,xr,yb,yt) + r)
m+=swfRecord(4,packUI16(1) + packUI16(1))
# - Create Flash header and write to browser
m+=swfRecord(1,'') # Show frame
m+=swfRecord(0,'') # End
m=packRect(bounds_left,bounds_right,bounds_bottom,bounds_top) + 0.chr + 12.chr + packUI16(1) + m
m='FWS' + 6.chr + packUI32(m.length+8) + m
render :text => m, :content_type => "application/x-shockwave-flash"
end
private
# =======================================================================
# SWF functions
# -----------------------------------------------------------------------
# Line-drawing
def startShape
s =0.chr # No fill styles
s+=2.chr # Two line styles
s+=packUI16(5) + 0.chr + 255.chr + 255.chr # Width 5, RGB #00FFFF
s+=packUI16(5) + 255.chr + 0.chr + 255.chr # Width 5, RGB #FF00FF
s+=34.chr # 2 fill, 2 line index bits
s
end
def endShape
'000000'
end
def startAndMove(x,y,col)
d='001001' # Line style change, moveTo
l =[lengthSB(x),lengthSB(y)].max
d+=sprintf("%05b%0#{l}b%0#{l}b",l,x,y)
d+=col # Select line style
end
def drawTo(absx,absy,x,y)
d='11' # TypeFlag, EdgeFlag
dx=x-absx
dy=y-absy
l =[lengthSB(dx),lengthSB(dy)].max
d+=sprintf("%04b",l-2)
d+='1' # GeneralLine
d+=sprintf("%0#{l}b%0#{l}b",dx,dy)
end
# -----------------------------------------------------------------------
# Specific data types
def swfRecord(id,r)
if r.length>62
return packUI16((id<<6)+0x3F) + packUI32(r.length) + r
else
return packUI16((id<<6)+r.length) + r
end
end
def packRect(a,b,c,d)
l=[lengthSB(a),
lengthSB(b),
lengthSB(c),
lengthSB(d)].max
n=sprintf("%05b%0#{l}b%0#{l}b%0#{l}b%0#{l}b",l,a,b,c,d)
[n].pack("B*")
end
# -----------------------------------------------------------------------
# Generic pack functions
def packUI16(n)
[n.floor].pack("v")
end
def packUI32(n)
[n.floor].pack("V")
end
# Find number of bits required to store arbitrary-length binary
def lengthSB(n)
Math.frexp(n+ (n==0?1:0) )[1]+1
end
# ====================================================================
# Co-ordinate conversion
# (this is duplicated from amf_controller, should probably share)
def lat2coord(a,basey,masterscale)
-(lat2y(a)-basey)*masterscale+250
end
def long2coord(a,baselong,masterscale)
(a-baselong)*masterscale+350
end
def lat2y(a)
180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
end
def sqlescape(a)
a.gsub("'","''").gsub(92.chr,92.chr+92.chr)
end
end