fix: improve rgb2hsl precision

README.md

@@ -186,7 +186,7 @@ color.alpha(); // 1.0
 
 color.hue(); // 210.0
 color.saturation(); // 0.68
-color.lightness(); // 0.8
+color.lightness(); // 0.8039
 
 color.hsv_hue(); // 210.0
 color.hsv_saturation(); // 0.28

src/color/stringify.rs

@@ -300,5 +300,18 @@ mod tests {
         assert_eq!(color.ycbcr(), "YCbCr(89.728, 149.5854, 64.0239)");
         assert_eq!(color.lab(), "lab(48.25, -28.85, -8.48)");
         assert_eq!(color.name(), "teal");
+
+        let color = Color::new(161, 110, 87, 1.0);
+        assert_eq!(color.hex(), "#a16e57");
+        assert_eq!(color.rgb(), "rgb(161, 110, 87)");
+        assert_eq!(color.rgba(), "rgba(161, 110, 87, 1)");
+        assert_eq!(color.hsl(), "hsl(19, 30%, 49%)");
+        assert_eq!(color.hsla(), "hsla(19, 30%, 49%, 1)");
+        assert_eq!(color.hsv(), "hsv(19, 46%, 63%)");
+        assert_eq!(color.hwb(), "hwb(19, 34%, 37%)");
+        assert_eq!(color.xyz(), "xyz(0.613946, 0.579082, 0.474123)");
+        assert_eq!(color.ycbcr(), "YCbCr(122.627, 107.9064, 155.3599)");
+        assert_eq!(color.lab(), "lab(51.17, 17.43, 20.99)");
+        assert_eq!(color.name(), "#a16e57");
     }
 }

src/color_calc/distance.rs

@@ -12,7 +12,7 @@ use crate::{Color, ColorSpace};
 /// let color2 = Color::from_str("#fff").unwrap();
 ///
 /// let d = distance_with(&color1, &color2, ColorSpace::HSL);
-/// assert_eq!(d, 60.01000749874974);
+/// assert_eq!(d, 60.01007098096119);
 /// ```
 pub fn distance_with(color1: &Color, color2: &Color, color_space: ColorSpace) -> f64 {
     let vec1 = color1.vec_of(color_space.clone());
@@ -63,6 +63,6 @@ mod tests {
         assert_eq!(d, 241.00414934187336);
 
         let d = distance_with(&color1, &color2, ColorSpace::HSL);
-        assert_eq!(d, 60.01000749874974);
+        assert_eq!(d, 60.01007098096119);
     }
 }

src/color_ops/darken.rs

@@ -14,7 +14,7 @@ impl Color {
     ///
     /// let mut color = Color::from_str("#426105").unwrap();
     /// color.darken(0.1).unwrap();
-    /// assert_eq!(color.hex(), "#213003");
+    /// assert_eq!(color.hex(), "#213102");
     /// ```
     pub fn darken(&mut self, amount: f64) -> Result<Self> {
         if amount.abs() > 1.0 {
@@ -56,7 +56,7 @@ mod tests {
     fn test_darken() {
         let mut color = Color::from_str("#426105").unwrap();
         color.darken(0.1).unwrap();
-        assert_eq!(color.hex(), "#213003");
+        assert_eq!(color.hex(), "#213102");
 
         let mut color = Color::from_str("#426105").unwrap();
         color.darken(0.5).unwrap();

src/conversion/hsl.rs

@@ -49,5 +49,5 @@ pub fn rgb2hsl(color: (f64, f64, f64)) -> (f64, f64, f64) {
         s = delta / (1.0 - (2.0 * l - 1.0).abs());
     }
 
-    (round(h, 2), round(s, 2), round(l, 2))
+    (round(h, 4), round(s, 4), round(l, 4))
 }

tests/color_calc.rs

@@ -10,5 +10,5 @@ fn test_color_calc() {
     assert_eq!(d, 265.00377355803823);
 
     let d = distance_with(&color1, &color2, ColorSpace::HSL);
-    assert_eq!(d, 0.6007495318350237);
+    assert_eq!(d, 0.6005717609078869);
 }

tests/color_channel.rs

@@ -12,7 +12,7 @@ fn test_color_channel() {
 
     assert_eq!(color.hue(), 210.0);
     assert_eq!(color.saturation(), 0.68);
-    assert_eq!(color.lightness(), 0.8);
+    assert_eq!(color.lightness(), 0.8039);
 
     assert_eq!(color.hsv_hue(), 210.0);
     assert_eq!(color.hsv_saturation(), 0.28);