Rework LuCI build system

[project/luci.git] / applications / luci-app-statistics / luasrc / statistics / rrdtool / colors.lua

diff --git a/applications/luci-app-statistics/luasrc/statistics/rrdtool/colors.lua b/applications/luci-app-statistics/luasrc/statistics/rrdtool/colors.lua
new file mode 100644 (file)
index 0000000..2da9f5a
--- /dev/null
+++ b/applications/luci-app-statistics/luasrc/statistics/rrdtool/colors.lua
@@ -0,0 +1,73 @@
+--[[
+
+Luci statistics - diagram color helper class
+(c) 2008 Freifunk Leipzig / Jo-Philipp Wich <xm@leipzig.freifunk.net>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+$Id$
+
+]]--
+
+module("luci.statistics.rrdtool.colors", package.seeall)
+
+require("luci.util")
+
+
+Instance = luci.util.class()
+
+function Instance.from_string( self, s )
+       return {
+               tonumber(s:sub(1,2), 16),
+               tonumber(s:sub(3,4), 16),
+               tonumber(s:sub(5,6), 16)
+       }
+end
+
+function Instance.to_string( self, c )
+       return string.format(
+               "%02x%02x%02x",
+               math.floor(c[1]),
+               math.floor(c[2]),
+               math.floor(c[3])
+       )
+end
+
+function Instance.random( self )
+       local r   = math.random(255)
+       local g   = math.random(255)
+       local min = 0
+       local max = 255
+
+       if ( r + g ) < 255 then
+               min = 255 - r - g
+       else
+               max = 511 - r - g
+       end
+
+       local b = min + math.floor( math.random() * ( max - min ) )
+
+       return { r, g, b }
+end
+
+function Instance.faded( self, fg, opts )
+       opts = opts or {}
+       opts.background = opts.background or { 255, 255, 255 }
+       opts.alpha      = opts.alpha      or 0.25
+
+       if type(opts.background) == "string" then
+               opts.background = _string_to_color(opts.background)
+       end
+
+       local bg = opts.background
+
+       return {
+               ( opts.alpha * fg[1] ) + ( ( 1.0 - opts.alpha ) * bg[1] ),
+               ( opts.alpha * fg[2] ) + ( ( 1.0 - opts.alpha ) * bg[2] ),
+               ( opts.alpha * fg[3] ) + ( ( 1.0 - opts.alpha ) * bg[3] )
+       }
+end