Add hex getter to Color (#384)

Author: Erym974

src/Color/Color.php

@@ -44,6 +44,11 @@ public function getOpacity(): float
         return 1 - $this->alpha / 127;
     }
 
+    public function getHex(): string
+    {
+        return sprintf('#%02x%02x%02x', $this->red, $this->green, $this->blue);
+    }
+
     public function toArray(): array
     {
         return [

src/Color/ColorInterface.php

@@ -16,6 +16,8 @@ public function getAlpha(): int;
 
     public function getOpacity(): float;
 
+    public function getHex(): string;
+
     /** @return array<string, int> */
     public function toArray(): array;
 }