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Hint for RGB color calculation #1726

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Jul 7, 2023
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Hint for RGB color calculation #1726

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6 changes: 5 additions & 1 deletion src/hello/print/fmt.md
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Expand Up @@ -78,15 +78,19 @@ RGB (0, 3, 254) 0x0003FE
RGB (0, 0, 0) 0x000000
```

Two hints if you get stuck:
Three hints if you get stuck:

* The formula for calculating a color in the RGB color space is:
`RGB = (R*65536)+(G*256)+B , (when R is RED, G is GREEN and B is BLUE)`.
For more see [RGB color format & calculation][rgb_color].
* You [may need to list each color more than once][named_parameters].
* You can [pad with zeros to a width of 2][fmt_width] with `:0>2`.

### See also:

[`std::fmt`][fmt]

[rgb_color]: https://www.rapidtables.com/web/color/RGB_Color.html#rgb-format
[named_parameters]: https://doc.rust-lang.org/std/fmt/#named-parameters
[deadbeef]: https://en.wikipedia.org/wiki/Deadbeef#Magic_debug_values
[fmt]: https://doc.rust-lang.org/std/fmt/
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