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Re: pack/unpack pos to binary

From eeew, 10 Years ago, written in Lua, viewed 771 times. This paste is a reply to 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.byte(
  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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Re: Re: pack/unpack pos to binar eeew lua 10 Years ago.

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