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How could I get a hex code when I give a color name – Telegram

I’m making a telegram bot and I would like for it to be able to give a hex code against a color name. I know there are a heck of a lot of rgb colors but I also know there is a wikipedia article with known color names and hex codes, if I could be able to get the pages as a json it would help. Also, if the json says hex code = color name how can I invert that? How can I search by the value and not the name?

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3

Answers


  1. 0

    You could write your own Hash then Hash#invert it:

    color_to_hex = { red: 'ff0000', green: '00ff00', blue: '0000ff' }
hex_to_color = color_to_hex.invert

color_to_hex[:red] #=> "ff0000"
hex_to_color['00ff00'] #=> :green

    Or without creating the inverse hash:

    colors_to_hex.key('00ff00') #=> :green
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  2. 0

    You can try following :

    color_mappings = { 'yellow' => 'ffff00', 'red' => 'ff0000', 'green' => '00ff00', 'blue' => '0000ff' }

    The hash can be inverted as follow :

    inverted_color_mappings = color_mappings.invert

    output :

    {
    "ffff00" => "yellow",
    "ff0000" => "red",
    "00ff00" => "green",
    "0000ff" => "blue"
}


pattern = 'fff'
inverted_color_mappings.select{ |k,v| k[pattern] }

    output :

    {
    "ffff00" => "yellow"
}
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  3. 0

    The other answers are fine. If you’re looking for a gem that’s already done the work for you, though, take a look at Color. Its Color::CSS[] method looks up a color by name and returns a Color::RGB object, which in turn has hex and html methods:

    require "color"

aliceblue = Color::CSS["aliceblue"]
puts aliceblue.hex
# => f0f8ff
puts aliceblue.html
# => #f0f8ff

    Color::RGB also has a by_hex static method, which will return a named Color::RGB object for the given hex code. The name method returns the name (if it has one):

    require "color"

mystery_color = Color::RGB.by_hex("#ffefd5")
puts mystery_color.name
# => papayawhip

    You can see it in action on repl.it: https://repl.it/@jrunning/EqualReasonableSpellchecker (If you get an error the first time you hit the run button, hit it again. repl.it sometimes has trouble with loading gems the first time.)

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