added constructors

source/color.cpp

@@ -13,6 +13,16 @@ namespace uml::color
     }
     
     Color Color::Blend(const Color &other, float ratio) const
+    {
+        return *this * (1.f - std::clamp(ratio, 0.f, 1.f)) + other * ratio;
+    }
+
+    Color::Color(float r, float g, float, float b, float a) : Vector4(r,g,b,a)
+    {
+
+    }
+
+    Color::Color(const Vector4 &vec) : Vector4(vec.x, vec.y, vec.z, vec.w)
     {
 
     }