stripped down all pixwerx code to a minimal istic subset

src/lib/vector.hpp

@@ -0,0 +1,62 @@
+#ifndef PARADISO_VECTOR_HPP
+#define PARADISO_VECTOR_HPP
+
+#include "matrix.hpp"
+
+namespace paradiso {
+
+/**
+ * Basic vector types used in pixwerx.
+ */
+
+template <typename T> struct Vector2 : Matrix<2, 1, T> {
+
+    using base_type = Matrix<2, 1, T>;
+
+    constexpr const T& x() const noexcept { return (*this)[0]; }
+    constexpr T& x() { return (*this)[0]; }
+
+    constexpr const T& y() const { return (*this)[1]; }
+    constexpr T& y() { return (*this)[1]; }
+
+    inline auto homogenous(T w = 1) const {
+        return Matrix<3, 1, T>({x(), y(), w});
+    }
+
+    static T angle_between(const Vector2& a, const Vector2& b) {
+        return std::acos(dot(a.normalized(), b.normalized()));
+    }
+};
+
+template <typename T> struct Vector3 : Matrix<3, 1, T> {
+
+    using base_type = Matrix<3, 1, T>;
+
+    constexpr const T& x() const { return (*this)[0]; }
+    constexpr T& x() { return (*this)[0]; }
+
+    constexpr const T& y() const { return (*this)[1]; }
+    constexpr T& y() { return (*this)[1]; }
+
+    constexpr Vector2<T> xy() const noexcept { return {x(), y()}; }
+
+    static constexpr Vector3 cross(const Vector3& lhs, const Vector3& rhs) {
+        return vector3_({lhs[1] * rhs[2] - rhs[1] * lhs[2],
+                         lhs[2] * rhs[0] - rhs[2] * lhs[0],
+                         lhs[0] * rhs[1] - rhs[0] * lhs[1]});
+    }
+
+    static constexpr auto x_axis() noexcept {
+        return Vector3::make(T{1}, T{0}, T{0});
+    }
+    static constexpr auto y_axis() noexcept {
+        return Vector3::make(T{0}, T{1}, T{0});
+    }
+    static constexpr auto z_axis() noexcept {
+        return Vector3<T>::make(T{0}, T{0}, T{1});
+    }
+};
+
+}; // namespace paradiso
+
+#endif