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const palettes = [
[[0.5, 0.5, 0.5], [0.5, 0.5, 0.5], [1.0, 1.0, 1.0], [0.00, 0.33, 0.67]],
[[0.5, 0.5, 0.5], [0.5, 0.5, 0.5], [1.0, 1.0, 1.0], [0.00, 0.10, 0.20]],
[[0.5, 0.5, 0.5], [0.5, 0.5, 0.5], [1.0, 1.0, 1.0], [0.30, 0.20, 0.20]],
[[0.5, 0.5, 0.5], [0.5, 0.5, 0.5], [1.0, 1.0, 0.5], [0.80, 0.90, 0.30]],
[[0.5, 0.5, 0.5], [0.5, 0.5, 0.5], [1.0, 0.7, 0.4], [0.00, 0.15, 0.20]],
[[0.5, 0.5, 0.5], [0.5, 0.5, 0.5], [2.0, 1.0, 0.0], [0.50, 0.20, 0.25]],
[[0.8, 0.5, 0.4], [0.2, 0.4, 0.2], [2.0, 1.0, 1.0], [0.00, 0.25, 0.25]],
]
let palette = palettes[0]
function channel (t, a, b, c, d, add, mul) {
return a + b * Math.cos(2 * Math.PI * (c * t + d)) * mul + add
}
function color (t, add, mul, alpha) {
add = add || 0
mul = mul || 1
let a, b, c, d
const rgb = []
for (var i = 0; i < 3; i++) {
a = palette[0][i]
b = palette[1][i]
c = palette[2][i]
d = palette[3][i]
rgb[i] = Math.round(channel(t, a, b, c, d, add, mul) * 255)
}
return 'rgba(' + rgb + ',' + alpha + ')'
}
export default color
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