Re: Re: pack/unpack pos to binar

From eeew, 11 Years ago, written in Lua, viewed 945 times. This paste is a reply to Re: pack/unpack pos to binary from eeew - go back
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function packpos(x, y, z)
    x = 819200+math.floor(x*100) -- -8192 - 8192   3 byte
    y = 819200+math.floor(y*100)
    z = math.floor(1300*65535/(z+100)) -- -100 - 1200   2 byte
    return string.byte(
        
char(
        
x, BitExtract(x, bitExtract(x, 8, 8), BitExtract(x, bitExtract(x, 16, 8),
        
8)
        
y, BitExtract(y, bitExtract(y, 8, 8), BitExtract(x, bitExtract(x, 16, 8),
        z, BitExtract(z, bitExtract(z, 8, 8))
end

function unpackpos(string, startindex)
    local x1, x2, x3, y1, y2, y3, z1, z2 = string:byte(startindex, startindex + 7)
    return  ((x1 + x2*256 + x3*65536) - 819200)/100,
            ((y1 + y2*256 + y3*65536) - 819200)/100,
            (z1 + z2*256)/65535*1300 - 100
end

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