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Sass implementation of the Noisy jquery plugin: https://github.com/DanielRapp/Noisy
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require "chunky_png" | |
require "base64" | |
module Sass::Script::Functions | |
def background_noise(kwargs = {}) | |
opts = {} | |
Sass::Util.map_hash({ | |
"intensity" => [0..1, "", :Number, Sass::Script::Number.new(0.5) ], | |
"opacity" => [0..1, "", :Number, Sass::Script::Number.new(0.08)], | |
"size" => [1..512, "px", :Number, Sass::Script::Number.new(200) ], | |
"monochrome" => [[true, false], "", :Bool, Sass::Script::Bool.new(false) ] | |
}) do |name, (range, units, type, default)| | |
if val = kwargs.delete(name) | |
assert_type val, type, name | |
if range && !range.include?(val.value) | |
raise ArgumentError.new("$#{name}: Amount #{val} must be between #{range.first}#{units} and #{range.last}#{units}") | |
end | |
else | |
val = default | |
end | |
opts[name] = val | |
end | |
image = ChunkyPNG::Image.new(opts["size"].to_i, opts["size"].to_i) | |
for i in (0..(opts["intensity"].to_s.to_f * (opts["size"].to_i**2))) | |
x = rand(opts["size"].to_i) | |
y = rand(opts["size"].to_i) | |
r = rand(255) | |
a = rand(255 * opts["opacity"].to_s.to_f) | |
color = opts["monochrome"] ? ChunkyPNG::Color.rgba(r, r, r, a) : ChunkyPNG::Color.rgba(r, rand(255), rand(255), a) | |
image.set_pixel(x, y, color) | |
end | |
data = Base64.encode64(image.to_blob).gsub("\n", "") | |
Sass::Script::String.new("url('data:image/png;base64,#{data}')") | |
end | |
declare :noise, [], :var_kwargs => true | |
end |
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$bg-noise-intensity-default: 0.5; | |
$bg-noise-opacity-default: 0.08; | |
$bg-noise-size-default: 200; | |
@mixin bg-noise( | |
$intensity: $bg-noise-intensity-default, | |
$opacity: $bg-noise-opacity-default, | |
$size: $bg-noise-size-default, | |
$mono: false | |
) { | |
background-color: $color; | |
background-image: background_noise($intensity, $opacity, $size, $mono); | |
background-repeat: repeat; | |
} | |
@mixin bg-noise-mono( | |
$intensity: $bg-noise-intensity-default, | |
$opacity: $bg-noise-opacity-default, | |
$size: $bg-noise-size-default | |
) { | |
@include bg-noise($intensity, $opacity, $size, true); | |
} | |
body { | |
@include bg-noise(#cecece); | |
} |
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