216 lines
6.6 KiB
Ruby
216 lines
6.6 KiB
Ruby
class SwfController < ApplicationController
|
|
skip_before_action :verify_authenticity_token
|
|
before_action :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
|
|
# - Initialise
|
|
|
|
baselong = params["baselong"].to_f
|
|
basey = params["basey"].to_f
|
|
masterscale = params["masterscale"].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 += swf_record(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
|
|
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," + " 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(bbox, "gps_points.") + " AND (gps_points.timestamp IS NOT NULL) " + "ORDER BY fileid DESC,ts " + "LIMIT 10000 OFFSET #{start}"
|
|
end
|
|
gpslist = ActiveRecord::Base.connection.select_all sql
|
|
|
|
# - Draw GPS trace lines
|
|
|
|
r = start_shape
|
|
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 || row["fileid"] != lastfile || row["trackid"] != lasttrack # or row['ts'].to_i==lasttime
|
|
b += start_and_move(xs, ys, "01")
|
|
absx = xs.floor
|
|
absy = ys.floor
|
|
end
|
|
b += draw_to(absx, absy, xs, ys)
|
|
absx = xs.floor
|
|
absy = ys.floor
|
|
lasttime = row["ts"].to_i
|
|
lastfile = row["fileid"]
|
|
lasttrack = row["trackid"]
|
|
r += [b.slice!(0...80)].pack("B*") while b.length > 80
|
|
end
|
|
|
|
# (Unwayed segments removed)
|
|
|
|
# - Write shape
|
|
|
|
b += end_shape
|
|
r += [b].pack("B*")
|
|
m += swf_record(2, pack_u16(1) + pack_rect(xl, xr, yb, yt) + r)
|
|
m += swf_record(4, pack_u16(1) + pack_u16(1))
|
|
|
|
# - Create Flash header and write to browser
|
|
|
|
m += swf_record(1, "") # Show frame
|
|
m += swf_record(0, "") # End
|
|
|
|
m = pack_rect(bounds_left, bounds_right, bounds_bottom, bounds_top) + 0.chr + 12.chr + pack_u16(1) + m
|
|
m = "FWS" + 6.chr + pack_u32(m.length + 8) + m
|
|
|
|
render :text => m, :content_type => "application/x-shockwave-flash"
|
|
end
|
|
|
|
private
|
|
|
|
# =======================================================================
|
|
# SWF functions
|
|
|
|
# -----------------------------------------------------------------------
|
|
# Line-drawing
|
|
|
|
def start_shape
|
|
s = 0.chr # No fill styles
|
|
s += 2.chr # Two line styles
|
|
s += pack_u16(0) + 0.chr + 255.chr + 255.chr # Width 5, RGB #00FFFF
|
|
s += pack_u16(0) + 255.chr + 0.chr + 255.chr # Width 5, RGB #FF00FF
|
|
s += 34.chr # 2 fill, 2 line index bits
|
|
s
|
|
end
|
|
|
|
def end_shape
|
|
"000000"
|
|
end
|
|
|
|
def start_and_move(x, y, col)
|
|
d = "001001" # Line style change, moveTo
|
|
l = [length_sb(x), length_sb(y)].max
|
|
d += format("%05b%0*b%0*b", l, l, x, l, y)
|
|
d += col # Select line style
|
|
d
|
|
end
|
|
|
|
def draw_to(absx, absy, x, y)
|
|
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 = ""
|
|
1.upto(mstep).each do
|
|
d += draw_section(x, y, x + xstep, y + ystep)
|
|
x += xstep
|
|
y += ystep
|
|
end
|
|
d
|
|
end
|
|
|
|
def draw_section(x1, y1, x2, y2)
|
|
d = "11" # TypeFlag, EdgeFlag
|
|
dx = x2 - x1
|
|
dy = y2 - y1
|
|
l = [length_sb(dx), length_sb(dy)].max
|
|
d += format("%04b", l - 2)
|
|
d += "1" # GeneralLine
|
|
d += format("%0*b%0*b", l, dx, l, dy)
|
|
d
|
|
end
|
|
|
|
# -----------------------------------------------------------------------
|
|
# Specific data types
|
|
|
|
# SWF data block type
|
|
|
|
def swf_record(id, r)
|
|
if r.length > 62
|
|
# Long header: tag id, 0x3F, length
|
|
return pack_u16((id << 6) + 0x3F) + pack_u32(r.length) + r
|
|
else
|
|
# Short header: tag id, length
|
|
return pack_u16((id << 6) + r.length) + r
|
|
end
|
|
end
|
|
|
|
# SWF RECT type
|
|
|
|
def pack_rect(a, b, c, d)
|
|
l = [length_sb(a),
|
|
length_sb(b),
|
|
length_sb(c),
|
|
length_sb(d)].max
|
|
# create binary string (00111001 etc.) - 5-byte length, then bbox
|
|
n = format("%05b%0*b%0*b%0*b%0*b", l, l, a, l, b, l, c, l, d)
|
|
# pack into byte string
|
|
[n].pack("B*")
|
|
end
|
|
|
|
# -----------------------------------------------------------------------
|
|
# Generic pack functions
|
|
|
|
def pack_u16(n)
|
|
[n.floor].pack("v")
|
|
end
|
|
|
|
def pack_u32(n)
|
|
[n.floor].pack("V")
|
|
end
|
|
|
|
# Find number of bits required to store arbitrary-length binary
|
|
|
|
def length_sb(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
|
|
end
|
|
|
|
def long2coord(a, baselong, masterscale)
|
|
(a - baselong) * masterscale
|
|
end
|
|
|
|
def lat2y(a)
|
|
180 / Math::PI * Math.log(Math.tan(Math::PI / 4 + a * (Math::PI / 180) / 2))
|
|
end
|
|
end
|