Question

我正在调用一个函数，该函数返回一个整数，表示16个二进制输入的位域，每个颜色都可以打开或关闭。

我正在尝试创建一个函数来获取oldstate和new状态之间的变化，

e.g。

function getChanges(oldColors,newColors)

  sampleOutput = {white = "",orange="added",magenta="removed" .....}
  return sampleOutput
end

我尝试从newColors中减去oldColors，从oldColors中减去新颜色，但这似乎导致混乱应该超过1个值。

这是为了检测多个输入的上升沿/下降沿。

* *修改：似乎有subset of the lua bit api available

从：ComputerCraft wiki

colors.white     1       0x1     0000000000000001
colors.orange    2       0x2     0000000000000010
colors.magenta   4       0x4     0000000000000100
colors.lightBlue 8       0x8     0000000000001000
colors.yellow    16      0x10    0000000000010000
colors.lime      32      0x20    0000000000100000
colors.pink      64      0x40    0000000001000000
colors.gray      128     0x80    0000000010000000
colors.lightGray 256     0x100   0000000100000000
colors.cyan      512     0x200   0000001000000000
colors.purple    1024    0x400   0000010000000000
colors.blue      2048    0x800   0000100000000000
colors.brown     4096    0x1000  0001000000000000
colors.green     8192    0x2000  0010000000000000
colors.red       16384   0x4000  0100000000000000
colors.black     32768   0x8000  1000000000000000

（这里应该有一个值表，但是我无法解决markdown的语法，看起来stackoverflow会忽略标准的html部分。）

Answer 1

function getChanges(oldColors,newColors)
   local added = bit.band(newColors, bit.bnot(oldColors))
   local removed = bit.band(oldColors, bit.bnot(newColors))
   local color_names = {
      white = 1,
      orange = 2,
      magenta = 4,
      lightBlue = 8,
      yellow = 16,
      lime = 32,
      pink = 64,
      gray = 128,
      lightGray = 256,
      cyan = 512,
      purple = 1024,
      blue = 2048,
      brown = 4096,
      green = 8192,
      red = 16384,
      black = 32768
   }
   local diff = {}
   for cn, mask in pairs(color_names) do
      diff[cn] = bit.band(added, mask) ~= 0 and 'added' 
         or bit.band(removed, mask) ~= 0 and 'removed' or ''
   end
   return diff
end

Lua：检测位域中的上升沿/下降沿

1 个答案: