From 38802b69c5cb1b75b7a19ae6a68fa1e45e271b3f Mon Sep 17 00:00:00 2001
From: ConnorSkees <39542938+ConnorSkees@users.noreply.github.com>
Date: Fri, 14 Feb 2020 09:46:50 -0500
Subject: [PATCH] Fix hue algorithm when red == blue and red > green

---
 src/color/mod.rs | 8 ++++----
 tests/color.rs   | 5 +++++
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/color/mod.rs b/src/color/mod.rs
index a66f9ee..9b3426c 100644
--- a/src/color/mod.rs
+++ b/src/color/mod.rs
@@ -102,7 +102,7 @@ impl Color {
         (((min + max) / Number::from(2)) * Number::from(100)).round()
     }
 
-    pub fn as_hsla(&self) -> (Number, Number, Number, Number) {
+    fn as_hsla(&self) -> (Number, Number, Number, Number) {
         let red = self.red.clone() / Number::from(255);
         let green = self.green.clone() / Number::from(255);
         let blue = self.blue.clone() / Number::from(255);
@@ -125,12 +125,12 @@ impl Color {
 
         let mut hue = if min == max {
             Number::from(0)
-        } else if red == max {
-            (green - blue) / (max - min)
+        } else if blue == max {
+            Number::from(4) + (red - green) / (max - min)
         } else if green == max {
             Number::from(2) + (blue - red) / (max - min)
         } else {
-            Number::from(4) + (red - green) / (max - min)
+            (green - blue) / (max - min)
         };
 
         if hue < Number::from(0) {
diff --git a/tests/color.rs b/tests/color.rs
index 1276745..7faed60 100644
--- a/tests/color.rs
+++ b/tests/color.rs
@@ -304,3 +304,8 @@ test!(
     "a {\n  color: desaturate(#855, 20%);\n}\n",
     "a {\n  color: #726b6b;\n}\n"
 );
+test!(
+    desaturate_correctly_calculates_hue,
+    "a {\n  color: desaturate(plum, 14%);\n}\n",
+    "a {\n  color: #d4a9d4;\n}\n"
+);