74 lines
1.5 KiB
Lua
74 lines
1.5 KiB
Lua
--[[
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Luci statistics - diagram color helper class
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(c) 2008 Freifunk Leipzig / Jo-Philipp Wich <xm@leipzig.freifunk.net>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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$Id: colors.lua 2829 2008-08-14 22:51:12Z Cyrus $
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]]--
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module("luci.statistics.rrdtool.colors", package.seeall)
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require("luci.util")
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Instance = luci.util.class()
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function Instance.from_string( self, s )
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return {
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tonumber(s:sub(1,2), 16),
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tonumber(s:sub(3,4), 16),
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tonumber(s:sub(5,6), 16)
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}
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end
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function Instance.to_string( self, c )
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return string.format(
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"%02x%02x%02x",
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math.floor(c[1]),
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math.floor(c[2]),
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math.floor(c[3])
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)
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end
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function Instance.random( self )
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local r = math.random(255)
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local g = math.random(255)
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local min = 0
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local max = 255
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if ( r + g ) < 255 then
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min = 255 - r - g
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else
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max = 511 - r - g
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end
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local b = min + math.floor( math.random() * ( max - min ) )
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return { r, g, b }
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end
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function Instance.faded( self, fg, opts )
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opts = opts or {}
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opts.background = opts.background or { 255, 255, 255 }
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opts.alpha = opts.alpha or 0.25
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if type(opts.background) == "string" then
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opts.background = _string_to_color(opts.background)
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end
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local bg = opts.background
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return {
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( opts.alpha * fg[1] ) + ( ( 1.0 - opts.alpha ) * bg[1] ),
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( opts.alpha * fg[2] ) + ( ( 1.0 - opts.alpha ) * bg[2] ),
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( opts.alpha * fg[3] ) + ( ( 1.0 - opts.alpha ) * bg[3] )
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}
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end
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