LibGfx: Add Vector2 class

Author: https://github.com/sunverwerth
Commit: https://github.com/SerenityOS/serenity/commit/aff6426000c
Pull-request: https://github.com/SerenityOS/serenity/pull/7019
Reviewed-by: https://github.com/alimpfard

Userland/Libraries/LibGfx/Vector2.h

@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@gmx.de>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <math.h>
+
+namespace Gfx {
+template<typename T>
+class Vector2 final {
+public:
+    constexpr Vector2() = default;
+    constexpr Vector2(T x, T y)
+        : m_x(x)
+        , m_y(y)
+    {
+    }
+
+    constexpr T x() const { return m_x; }
+    constexpr T y() const { return m_y; }
+
+    constexpr void set_x(T value) { m_x = value; }
+    constexpr void set_y(T value) { m_y = value; }
+
+    constexpr Vector2& operator+=(const Vector2& other)
+    {
+        m_x += other.m_x;
+        m_y += other.m_y;
+        return *this;
+    }
+
+    constexpr Vector2& operator-=(const Vector2& other)
+    {
+        m_x -= other.m_x;
+        m_y -= other.m_y;
+        return *this;
+    }
+
+    constexpr Vector2 operator+(const Vector2& other) const
+    {
+        return Vector2(m_x + other.m_x, m_y + other.m_y);
+    }
+
+    constexpr Vector2 operator-(const Vector2& other) const
+    {
+        return Vector2(m_x - other.m_x, m_y - other.m_y);
+    }
+
+    constexpr Vector2 operator*(const Vector2& other) const
+    {
+        return Vector2(m_x * other.m_x, m_y * other.m_y);
+    }
+
+    constexpr Vector2 operator/(const Vector2& other) const
+    {
+        return Vector2(m_x / other.m_x, m_y / other.m_y);
+    }
+
+    constexpr Vector2 operator*(T f) const
+    {
+        return Vector2(m_x * f, m_y * f);
+    }
+
+    constexpr Vector2 operator/(T f) const
+    {
+        return Vector2(m_x / f, m_y / f);
+    }
+
+    constexpr T dot(const Vector2& other) const
+    {
+        return m_x * other.m_x + m_y * other.m_y;
+    }
+
+    constexpr Vector2 normalized() const
+    {
+        T inv_length = 1 / length();
+        return *this * inv_length;
+    }
+
+    constexpr Vector2 clamped(T m, T x) const
+    {
+        Vector2 copy { *this };
+        copy.clamp(m, x);
+        return copy;
+    }
+
+    constexpr void clamp(T min_value, T max_value)
+    {
+        m_x = max(min_value, m_x);
+        m_y = max(min_value, m_y);
+        m_x = min(max_value, m_x);
+        m_y = min(max_value, m_y);
+    }
+
+    constexpr void normalize()
+    {
+        T inv_length = 1 / length();
+        m_x *= inv_length;
+        m_y *= inv_length;
+    }
+
+    constexpr T length() const
+    {
+        return sqrt(m_x * m_x + m_y * m_y);
+    }
+
+private:
+    T m_x;
+    T m_y;
+};
+
+typedef Vector2<float> FloatVector2;
+typedef Vector2<double> DoubleVector2;
+
+}
+
+using Gfx::DoubleVector2;
+using Gfx::FloatVector2;
+using Gfx::Vector2;