feat(color): support lab string of the color

JiatLn · Apr 23, 2023 · fb9def9 · fb9def9
1 parent 56d732d
commit fb9def9
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Showing 4 changed files with 24 additions and 4 deletions.
diff --git a/README.md b/README.md
@@ -129,7 +129,7 @@ let color = Color::from_hex("#ffff00").unwrap();
 
 Stringify a color to a string.
 
-You can use the `hex`, `rgb`, `rgba`, `hsl`, `hsv`, `hwb`, `cmyk`, `xyz`, `yuv`, `YCbCr`, `name` method to stringify a color to a string.
+You can use the `hex`, `rgb`, `rgba`, `hsl`, `hsv`, `hwb`, `cmyk`, `xyz`, `yuv`, `YCbCr`, `lab`, `name` method to stringify a color to a string.
 
 For example:
 
@@ -149,6 +149,7 @@ color.xyz(); // "xyz(0.932231, 0.975339, 0.502949)"
 color.yuv(); // "yuv(0.886, -0.4359, 0.1)"
 color.ycbcr(); // "YCbCr(225.93, 0.5755, 148.7269)"
 color.name(); // "yellow"
+color.lab(); // "lab(97.14, -21.55, 94.48)"
 ```
 
 ### Color Channel

diff --git a/src/color/stringify.rs b/src/color/stringify.rs
@@ -1,7 +1,7 @@
 use crate::{
     conversion::{
-        cmyk::rgb2cmyk, hex::rgb2hex, hsl::rgb2hsl, hsv::rgb2hsv, hwb::rgb2hwb, xyz::rgb2xyz,
-        ycbcr::rgb2ycbcr, yuv::rgb2yuv,
+        cmyk::rgb2cmyk, hex::rgb2hex, hsl::rgb2hsl, hsv::rgb2hsv, hwb::rgb2hwb, lab::rgb2lab,
+        xyz::rgb2xyz, ycbcr::rgb2ycbcr, yuv::rgb2yuv,
     },
     helper::round,
     Color,
@@ -152,6 +152,19 @@ impl Color {
         let (y, u, v) = rgb2yuv(self.rgb);
         format!("yuv({}, {}, {})", round(y, 4), round(u, 4), round(v, 4))
     }
+    /// `lab` string of the color
+    ///
+    /// # Examples
+    /// ```rust
+    /// use color_art::Color;
+    ///
+    /// let color = Color::new(255.0, 255.0, 0.0, 1.0);
+    /// assert_eq!(color.lab(), "lab(97.14, -21.55, 94.48)");
+    /// ```
+    pub fn lab(self) -> String {
+        let (l, a, b) = rgb2lab(self.rgb);
+        format!("lab({}, {}, {})", round(l, 2), round(a, 2), round(b, 2))
+    }
     /// `YCbCr` string of the color
     ///
     /// # Examples
@@ -209,6 +222,7 @@ mod tests {
         assert_eq!(color.hwb(), "hwb(0, 100%, 0%)");
         assert_eq!(color.xyz(), "xyz(1, 1, 1)");
         assert_eq!(color.ycbcr(), "YCbCr(255, 128, 128)");
+        assert_eq!(color.lab(), "lab(100, 0, 0)");
 
         let color = Color::new(0.0, 0.0, 0.0, 0.5);
         assert_eq!(color.hex(), "#000000");
@@ -219,6 +233,7 @@ mod tests {
         assert_eq!(color.hwb(), "hwb(0, 0%, 100%)");
         assert_eq!(color.xyz(), "xyz(0.137931, 0.137931, 0.137931)");
         assert_eq!(color.ycbcr(), "YCbCr(0, 128, 128)");
+        assert_eq!(color.lab(), "lab(0, 0, 0)");
 
         let color = Color::new(0.0, 128.0, 128.0, 1.0);
         assert_eq!(color.hex(), "#008080");
@@ -229,5 +244,6 @@ mod tests {
         assert_eq!(color.hwb(), "hwb(180, 0%, 50%)");
         assert_eq!(color.xyz(), "xyz(0.496222, 0.553915, 0.596299)");
         assert_eq!(color.ycbcr(), "YCbCr(89.728, 149.5854, 64.0239)");
+        assert_eq!(color.lab(), "lab(48.25, -28.85, -8.48)");
     }
 }
diff --git a/src/conversion/lab.rs b/src/conversion/lab.rs
@@ -4,7 +4,6 @@ use super::{
 };
 use crate::helper::round;
 
-#[allow(unused)]
 pub fn rgb2lab(color: (f64, f64, f64)) -> (f64, f64, f64) {
     let (x, y, z) = rgb2xyz(color);
 

diff --git a/tests/color_stringify.rs b/tests/color_stringify.rs
@@ -15,4 +15,8 @@ fn test_color_stringify() {
     assert_eq!(color.name(), "yellow");
     assert_eq!(color.xyz(), "xyz(0.932231, 0.975339, 0.502949)");
     assert_eq!(color.yuv(), "yuv(0.886, -0.4359, 0.1)");
+    assert_eq!(color.lab(), "lab(97.14, -21.55, 94.48)");
+
+    let color = Color::from_str("orange").unwrap();
+    assert_eq!(color.lab(), "lab(74.94, 23.93, 78.95)");
 }