Create colorlib.lua

lib/colorlib.lua

@@ -0,0 +1,88 @@
+local colorlib = {}
+
+--utils
+local function check(tVal, tMaxVal, tMinVal, tType)
+  
+end
+
+local function isNan(x)
+	return x~=x
+end
+
+--RGB model
+function colorlib.HEXtoRGB(color)
+  color = math.ceil(color)
+
+  local rr = bit32.rshift( color, 16 )
+  local gg = bit32.rshift( bit32.band(color, 0x00ff00), 8 )
+  local bb = bit32.band(color, 0x0000ff)
+
+  return rr, gg, bb
+end
+
+function colorlib.RGBtoHEX(rr, gg, bb)
+  return bit32.lshift(rr, 16) + bit32.lshift(gg, 8) + bb
+end
+
+--HSB model
+function colorlib.RGBtoHSB(rr, gg, bb)
+  local max = math.max(rr, math.max(gg, bb))
+  local min = math.min(rr, math.min(gg, bb))
+  local delta = max - min
+
+  local h = 0
+  if ( max == rr and gg >= bb) then h = 60*(gg-bb)/delta end
+  if ( max == rr and gg <= bb ) then h = 60*(gg-bb)/delta + 360 end
+  if ( max == gg ) then h = 60*(bb-rr)/delta + 120 end
+  if ( max == bb ) then h = 60*(rr-gg)/delta + 240 end
+
+  local s = 0
+  if ( max ~= 0 ) then s = 1-(min/max) end
+
+  local b = max*100/255
+
+  if isNan(h) then h = 0 end
+
+  return h, s*100, b
+end
+
+function colorlib.HSBtoRGB(h, s, v)
+  if h >359 then h = 0 end
+  local rr, gg, bb = 0, 0, 0
+  local const = 255
+
+  s = s/100
+  v = v/100
+  
+  local i = math.floor(h/60)
+  local f = h/60 - i
+  
+  local p = v*(1-s)
+  local q = v*(1-s*f)
+  local t = v*(1-(1-f)*s)
+
+  if ( i == 0 ) then rr, gg, bb = v, t, p end
+  if ( i == 1 ) then rr, gg, bb = q, v, p end
+  if ( i == 2 ) then rr, gg, bb = p, v, t end
+  if ( i == 3 ) then rr, gg, bb = p, q, v end
+  if ( i == 4 ) then rr, gg, bb = t, p, v end
+  if ( i == 5 ) then rr, gg, bb = v, p, q end
+
+  return rr*const, gg*const, bb*const
+end
+
+function colorlib.HEXtoHSB(color)
+  local rr, gg, bb = colorlib.HEXtoRGB(color)
+  local h, s, b = colorlib.RGBtoHSB( rr, gg, bb )
+  
+  return h, s, b
+end
+
+function colorlib.HSBtoHEX(h, s, b)
+  local rr, gg, bb = colorlib.HSBtoRGB(h, s, b)
+  local color = colorlib.RGBtoHEX(rr, gg, bb)
+
+  return color
+end
+
+return colorlib