class SwfController < ApplicationController
- session :off
- before_filter :check_read_availability
+ skip_before_filter :verify_authenticity_token
+ before_filter :check_api_readable
# 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
-
+ 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;
-
+
+ bbox = BoundingBox.new(params['xmin'], params['ymin'],
+ params['xmax'], params['ymax'])
+ start=params['start'].to_i;
+
# - 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) #ÊBackground
+ 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'
-
+ lasttrack=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 "+
+ 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,"+
+ " EXTRACT(EPOCH FROM gps_points.timestamp) AS ts, gps_points.trackid AS trackid "+
+ " FROM gpx_files,gps_points "+
+ "WHERE gpx_files.id=gpx_id "+
+ " AND gpx_files.user_id=#{user.id} "+
+ " AND "+OSM.sql_for_area(bbox,"gps_points.")+
+ " AND (gps_points.timestamp IS NOT NULL) "+
+ "ORDER BY fileid DESC,ts "+
+ "LIMIT 10000 OFFSET #{start}"
+ else
+ sql="SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lon,gpx_id AS fileid,"+
+ " EXTRACT(EPOCH FROM timestamp) AS ts, gps_points.trackid AS trackid "+
" FROM gps_points "+
- "WHERE "+OSM.sql_for_area(ymin,xmin,ymax,xmax,"gps_points.")+
+ "WHERE "+OSM.sql_for_area(bbox,"gps_points.")+
" AND (gps_points.timestamp IS NOT NULL) "+
"ORDER BY fileid DESC,ts "+
- "LIMIT 10000"
+ "LIMIT 10000 OFFSET #{start}"
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 and row['ts'].to_i!=lasttime)
- b+=drawTo(absx,absy,xs,ys)
- else
- b+=startAndMove(xs,ys,'01')
- end
+ if row['ts'].to_i-lasttime>180 or row['fileid']!=lastfile or row['trackid']!=lasttrack #or row['ts'].to_i==lasttime
+ b+=startAndMove(xs,ys,'01')
+ absx=xs.floor; absy=ys.floor
+ end
+ b+=drawTo(absx,absy,xs,ys)
absx=xs.floor; absy=ys.floor
lasttime=row['ts'].to_i
lastfile=row['fileid']
+ lasttrack=row['trackid']
while b.length>80 do
r+=[b.slice!(0...80)].pack("B*")
end
end
-
+
# (Unwayed segments removed)
-
+
# - 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
# =======================================================================
# 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+=packUI16(0) + 0.chr + 255.chr + 255.chr # Width 5, RGB #00FFFF
+ s+=packUI16(0) + 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
-
+
+ # Split the line up if there's anything>16383, because
+ # that would overflow the 4 bits allowed for length
+ mstep=[dx.abs/16383,dy.abs/16383,1].max.ceil
+ xstep=dx/mstep
+ ystep=dy/mstep
+ d=''
+ for i in (1..mstep)
+ d+=drawSection(x,y,x+xstep,y+ystep)
+ x+=xstep
+ y+=ystep
+ end
+ d
+ end
+
+ def drawSection(x1,y1,x2,y2)
+ d='11' # TypeFlag, EdgeFlag
+ dx=x2-x1
+ dy=y2-y1
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
+ end
# -----------------------------------------------------------------------
# Specific data types
+ # SWF data block type
+
def swfRecord(id,r)
if r.length>62
+ # Long header: tag id, 0x3F, length
return packUI16((id<<6)+0x3F) + packUI32(r.length) + r
else
+ # Short header: tag id, length
return packUI16((id<<6)+r.length) + r
end
end
+ # SWF RECT type
+
def packRect(a,b,c,d)
l=[lengthSB(a),
lengthSB(b),
lengthSB(c),
lengthSB(d)].max
+ # create binary string (00111001 etc.) - 5-byte length, then bbox
n=sprintf("%05b%0#{l}b%0#{l}b%0#{l}b%0#{l}b",l,a,b,c,d)
+ # pack into byte string
[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
+ -(lat2y(a)-basey)*masterscale
end
-
+
def long2coord(a,baselong,masterscale)
- (a-baselong)*masterscale+350
+ (a-baselong)*masterscale
end
-
+
def lat2y(a)
180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
end
projects / rails.git / blobdiff