applications/luci-statistics/src/statistics/rrdtool/colors.lua

   1 module("luci.statistics.rrdtool.colors", package.seeall)
   2
   3 require("luci.util")
   4 require("luci.bits")
   5
   6
   7 Instance = luci.util.class()
   8
   9 function Instance.from_string( self, s )
  10         return {
  11                 luci.bits.Hex2Dec(s:sub(1,2)),
  12                 luci.bits.Hex2Dec(s:sub(3,4)),
  13                 luci.bits.Hex2Dec(s:sub(5,6))
  14         }
  15 end
  16
  17 function Instance.to_string( self, c )
  18         return string.format(
  19                 "%02x%02x%02x",
  20                 math.floor(c[1]),
  21                 math.floor(c[2]),
  22                 math.floor(c[3])
  23         )
  24 end
  25
  26 function Instance.random( self )
  27         local r   = math.random(255)
  28         local g   = math.random(255)
  29         local min = 0
  30         local max = 255
  31
  32         if ( r + g ) < 255 then
  33                 min = 255 - r - g
  34         else
  35                 max = 511 - r - g
  36         end
  37
  38         local b = min + math.floor( math.random() * ( max - min ) )
  39
  40         return { r, g, b }
  41 end
  42
  43 function Instance.faded( self, fg, opts )
  44         opts = opts or {}
  45         opts.background = opts.background or { 255, 255, 255 }
  46         opts.alpha      = opts.alpha      or 0.25
  47
  48         if type(opts.background) == "string" then
  49                 opts.background = _string_to_color(opts.background)
  50         end
  51
  52         local bg = opts.background
  53
  54         return {
  55                 ( opts.alpha * fg[1] ) + ( ( 1.0 - opts.alpha ) * bg[1] ),
  56                 ( opts.alpha * fg[2] ) + ( ( 1.0 - opts.alpha ) * bg[2] ),
  57                 ( opts.alpha * fg[3] ) + ( ( 1.0 - opts.alpha ) * bg[3] )
  58         }
  59 end