Question

I need to convert float RGB values provided by Cucumber from an iOS app to Ints so that I can compare them as hex color to expected hex colors.

Problem is that Ruby to_s(16) only works with Fixnums, not floats.

Cucumber fetches this from iOS app:

{
      "red" => 0.7490196078431373,
    "alpha" => 1,
     "type" => "UIDeviceRGBColor",
     "blue" => 0,
    "green" => 0
}

So I have three float RGB values that I need to convert to a hexadecimal string. But I can't just say r.to_s(16). How do I convert the values properly to integers to be able to use them with string base conversion in Ruby?

Answer 1

您的源值在0..1范围内，而目标值在0..255范围内（或者对于十六进制为0..0xFF）。

首先，让我们获取值：

data = {
      "red" => 0.7490196078431373,
    "alpha" => 1,
     "type" => "UIDeviceRGBColor",
     "blue" => 0,
    "green" => 0
}

values = data.values_at('red', 'green', 'blue')
#=> [0.7490196078431373, 0, 0]

现在我们可以将它们乘以255：

values.map! { |v| (v * 255).round }
#=> [191, 0, 0]

最后将它们格式化为十六进制值：

'%02x%02x%02x' % values
#=> "bf0000"

Convert Float RGB Color Components to Integer in Ruby

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