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// Convert number to hex string. | |
pub fn to_hex (value: i32) -> String { | |
let value = if value > 255 { 255 } else if value < 0 { 0 } else { value }; | |
format!("{:02X}", value) | |
} | |
// Join all hex strings together from rgb input. | |
pub fn rgb (r: i32, g: i32, b: i32) -> String { | |
format!("{}{}{}", to_hex(r), to_hex(g), to_hex(b)) | |
} | |
#[cfg(test)] | |
mod tests { | |
use super::*; | |
#[test] | |
fn it_should_be_black() { | |
assert_eq!(rgb(255, 255, 255), "FFFFFF".to_string()); | |
} | |
#[test] | |
fn it_should_be_black_too() { | |
assert_eq!(rgb(255, 255, 300), "FFFFFF".to_string()); | |
} | |
#[test] | |
fn it_should_be_white() { | |
assert_eq!(rgb(0, 0, 0), "000000".to_string()); | |
} | |
#[test] | |
fn it_should_be_other() { | |
assert_eq!(rgb(148, 0, 211), "9400D3".to_string()); | |
} | |
} |
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