From d4356257573244fd754133e16da05755909766b9 Mon Sep 17 00:00:00 2001
From: Orange <orange-cpp@yandex.ru>
Date: Sat, 18 May 2024 13:58:54 +0300
Subject: [PATCH] added hsv stuff

---
 include/uml/color.h | 20 ++++++++++++++-
 source/color.cpp    | 62 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 80 insertions(+), 2 deletions(-)

diff --git a/include/uml/color.h b/include/uml/color.h
index d5c05ff..f3f3795 100644
--- a/include/uml/color.h
+++ b/include/uml/color.h
@@ -11,6 +11,13 @@
 
 namespace uml::color
 {
+    struct HSV
+    {
+        float m_hue{};
+        float m_saturation{};
+        float m_value{};
+    };
+
     [[nodiscard]]
     Vector3 Blend(const Vector3& first, const Vector3& second, float ratio);
 
@@ -18,9 +25,20 @@ namespace uml::color
     {
         public:
             Color(float r, float g, float b, float a);
+
+            [[nodiscard]]
             static Color FromRGBA(uint8_t r, uint8_t g, uint8_t b, uint8_t a);
+
+            [[nodiscard]]
+            static Color FromHSV(float hue, float saturation, float value);
+
+            [[nodiscard]]
+            HSV ToHSV() const;
+
             explicit Color(Vector4 vec);
-            [[nodiscard]] Color Blend(const Color& other, float ratio) const;
+
+            [[nodiscard]]
+            Color Blend(const Color& other, float ratio) const;
 
         [[nodiscard]] static Color Red() {return {1.f, 0.f, 0.f, 1.f};}
         [[nodiscard]] static Color Green() {return {0.f, 1.f, 0.f, 1.f};}
diff --git a/source/color.cpp b/source/color.cpp
index d056008..0d09319 100644
--- a/source/color.cpp
+++ b/source/color.cpp
@@ -4,6 +4,8 @@
 
 #include "uml/color.h"
 #include <algorithm>
+#include <cmath>
+
 
 namespace uml::color
 {
@@ -35,4 +37,62 @@ namespace uml::color
     {
         return Color{Vector4(r, g, b, a) / 255.f};
     }
-}
\ No newline at end of file
+
+    Color Color::FromHSV(float hue, const float saturation, const float value) {
+        float r{}, g{}, b{};
+
+        hue = std::clamp(hue, 0.f, 1.f);
+
+        const int i = static_cast<int>(hue * 6.f);
+        const float f = hue * 6 - i;
+        const float p = value * (1 - saturation);
+        const float q = value * (1 - f * saturation);
+        const float t = value * (1 - (1 - f) * saturation);
+
+        switch (i % 6)
+        {
+            case 0: r = value, g = t, b = p; break;
+            case 1: r = q, g = value, b = p; break;
+            case 2: r = p, g = value, b = t; break;
+            case 3: r = p, g = q, b = value; break;
+            case 4: r = t, g = p, b = value; break;
+            case 5: r = value, g = p, b = q; break;
+
+            default: return {0.f, 0.f, 0.f, 0.f};
+        }
+
+        return {r, g, b, 1.f};
+    }
+
+    HSV Color::ToHSV() const {
+        HSV hsvData;
+
+        const float& red = x;
+        const float& green = y;
+        const float& blue = z;
+
+        const float max = std::max({red, green, blue});
+        const float min = std::min({red, green, blue});
+        const float delta = max - min;
+
+
+        if (delta == 0.f)
+            hsvData.m_hue = 0.f;
+
+        else if (max == red)
+            hsvData.m_hue = 60.f * (std::fmodf(((green - blue) / delta), 6.f));
+        else if (max == green)
+            hsvData.m_hue = 60.f * (((blue - red) / delta) + 2.f);
+        else if (max == blue)
+            hsvData.m_hue = 60.f * (((red - green) / delta) + 4.f);
+
+        if (hsvData.m_hue < 0.f)
+            hsvData.m_hue += 360.f;
+
+        hsvData.m_hue /= 360.f;
+        hsvData.m_saturation = max == 0.f ? 0.f : delta / max;
+        hsvData.m_value = max;
+
+        return hsvData;
+    }
+}