From c9624a84ba6e2025a6aa7bc647797d5fb9890df7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Torsten=20L=C3=BCcke?= <privat@torsten-hettstedt.de>
Date: Thu, 4 Mar 2021 13:55:16 +0100
Subject: [PATCH] =?UTF-8?q?Die=20Werte=20werden=20ann=C3=A4hernd=20ermitte?=
 =?UTF-8?q?lt.=20Es=20gibt=20noch=20Rundungsfehler.?=
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---
 .../HueSaturationValueToRedGreenBlue.php      | 48 ++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

diff --git a/src/Transformer/Utilities/HueSaturationValueToRedGreenBlue.php b/src/Transformer/Utilities/HueSaturationValueToRedGreenBlue.php
index 83544cb..b68fe2d 100644
--- a/src/Transformer/Utilities/HueSaturationValueToRedGreenBlue.php
+++ b/src/Transformer/Utilities/HueSaturationValueToRedGreenBlue.php
@@ -9,6 +9,9 @@ use TorstenHettstedt\Colors\ColorModels\RedGreenBlue;
 
 class HueSaturationValueToRedGreenBlue
 {
+    /** @var int : Größe des Intervals in 1/100 Grad */
+    protected const INTERVAL = 60 * 100;
+
     // Daten für HSV
     /** @var float : Definition des Farbton als Anteil eines Vollkreises '$Hue * π' */
     protected float $hue;
@@ -59,7 +62,50 @@ class HueSaturationValueToRedGreenBlue
 
     protected function splitColor(): void
     {
-
+        // Anteil am Vollkreis in 1/100 Grad
+        $percent_grad = intval($this->hue * 360 * 100);
+        // ID des zu nutzenden Interval
+        $interval_id = intdiv($percent_grad , self::INTERVAL);
+        // Rest-Anteil am Vollkreis des aktuellen Intervals als Wert '[0,1]'
+        $remainder = (($percent_grad % self::INTERVAL) / self::INTERVAL);
+        $help_values = [
+            $this->value,
+            $this->value * ( 1 - $this->saturation),
+            $this->value * ( 1 - $this->saturation * $remainder),
+            $this->value * ( 1 - $this->saturation * (1 - $remainder)),
+        ];
+        switch ($interval_id) {
+            case 1:
+                $this->red = $help_values[2];
+                $this->green = $help_values[0];
+                $this->blu = $help_values[1];
+                break;
+            case 2:
+                $this->red = $help_values[1];
+                $this->green = $help_values[0];
+                $this->blu = $help_values[3];
+                break;
+            case 3:
+                $this->red = $help_values[1];
+                $this->green = $help_values[2];
+                $this->blu = $help_values[0];
+                break;
+            case 4:
+                $this->red = $help_values[3];
+                $this->green = $help_values[1];
+                $this->blu = $help_values[0];
+                break;
+            case 5:
+                $this->red = $help_values[0];
+                $this->green = $help_values[1];
+                $this->blu = $help_values[2];
+                break;
+            default:
+                $this->red = $help_values[0];
+                $this->green = $help_values[3];
+                $this->blu = $help_values[1];
+                break;
+        }
     }
 
 }
\ No newline at end of file