Some better coloring for nnoggi

color.lua

-- h must be [0.0, 1.0]
-- based on [0.0, 360.0] degrees on the HSV color circle
function MDT_GetHueColor(h) 
    local i = math.floor(h * 6)
    local f = h * 6 - i
    local q = 1 - f

    i = i % 6

    local r, g, b
    if i == 0 then r, g, b = 1, f, 0
    elseif i == 1 then r, g, b = q, 1, 0
    elseif i == 2 then r, g, b = 0, 1, f
    elseif i == 3 then r, g, b = 0, q, 1
    elseif i == 4 then r, g, b = f, 0, 1
    elseif i == 5 then r, g, b = 1, 0, q
    end

    return r, g, b
end

function MDT_Random(seed) 
    return bit.band(seed * 97, 0xFF) / 0xFF
end

function MDT_GetRandomColor(seed) 
    return MDT_GetHueColor(MDT_Random(seed))
end

-- you want to avoid red colors so we have to limit the hue to [0.1, 0.9]
-- values around 0.0 are red
function MDT_GetRandomNonRedColor(seed) 
    return MDT_GetHueColor(MDT_Random(seed) * 0.8 + 0.1)
end

-- example code generating 10 random colors for different seeds
for i = 0, 10 do
    print(string.format("%.2f, %.2f, %.2f", MDT_GetRandomNonRedColor(i)))
end