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[rails.git] / app / controllers / swf_controller.rb

diff --git a/app/controllers/swf_controller.rb b/app/controllers/swf_controller.rb
index d989a5e909f4462470e66e1a578ec9e1ba71b259..0e7e15bbf322655897d1be135b42e188a0c8a982 100644 (file)
--- a/app/controllers/swf_controller.rb
+++ b/app/controllers/swf_controller.rb
@@ -6,6 +6,7 @@ class SwfController < ApplicationController
 # $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
        
@@ -75,11 +76,11 @@ class SwfController < ApplicationController
                        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['trackid']==lasttrack 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']
@@ -138,33 +139,58 @@ class SwfController < ApplicationController
        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