Re: Re: pack/unpack pos to binar

From eeew, 10 Years ago, written in Lua, viewed 865 times. This paste is a reply to Re: pack/unpack pos to binary from eeew - view diff
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  1. function packpos(x, y, z)
  2.     x = 819200+math.floor(x*100) -- -8192 - 8192   3 byte
  3.     y = 819200+math.floor(y*100)
  4.     z = math.floor(1300*65535/(z+100)) -- -100 - 1200   2 byte
  5.     return string.char(
  6.         x, bitExtract(x, 8, 8), bitExtract(x, 16, 8)
  7.         y, bitExtract(y, 8, 8), bitExtract(x, 16, 8),
  8.         z, bitExtract(z, 8, 8))
  9. end
  10.  
  11. function unpackpos(string, startindex)
  12.     local x1, x2, x3, y1, y2, y3, z1, z2 = string:byte(startindex, startindex + 7)
  13.     return  ((x1 + x2*256 + x3*65536) - 819200)/100,
  14.             ((y1 + y2*256 + y3*65536) - 819200)/100,
  15.             (z1 + z2*256)/65535*1300 - 100
  16. end
  17.  

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