Restore accidentally removed files

flix/vector.h

@@ -0,0 +1,90 @@
+// Lightweight vector library
+// Copyright (c) 2023 Oleg Kalachev <okalachev@gmail.com>
+// Repository: https://github.com/okalachev/flix
+
+#pragma once
+
+class Vector : public Printable
+{
+public:
+	float x, y, z;
+
+	Vector(): x(0), y(0), z(0) {};
+
+	Vector(float x, float y, float z): x(x), y(y), z(z) {};
+
+	float norm() const
+	{
+		return sqrt(x * x + y * y + z * z);
+	}
+
+	bool zero() const
+	{
+		return x == 0 && y == 0 && z == 0;
+	}
+
+	void normalize()
+	{
+		float n = norm();
+		x /= n;
+		y /= n;
+		z /= n;
+	}
+
+	Vector operator * (float b)
+	{
+		return Vector(x * b, y * b, z * b);
+	}
+
+	Vector operator + (const Vector& b) const
+	{
+		return Vector(x + b.x, y + b.y, z + b.z);
+	}
+
+	Vector operator - (const Vector& b) const
+	{
+		return Vector(x - b.x, y - b.y, z - b.z);
+	}
+
+	inline bool operator == (const Vector& b) const
+	{
+		return x == b.x && y == b.y && z == b.z;
+	}
+
+	inline bool operator != (const Vector& b) const
+	{
+		return !(*this == b);
+	}
+
+	inline bool finite() const
+	{
+		return isfinite(x) && isfinite(y) && isfinite(z);
+	}
+
+	static float dot(const Vector& a, const Vector& b)
+	{
+		return a.x * b.x + a.y * b.y + a.z * b.z;
+	}
+
+	static Vector cross(const Vector& a, const Vector& b)
+	{
+		return Vector(a.y * b.z - a.z * b.y, a.z * b.x - a.x * b.z, a.x * b.y - a.y * b.x);
+	}
+
+	static float angleBetweenVectors(const Vector& a, const Vector& b)
+	{
+		return acos(dot(a, b) / (a.norm() * b.norm()));
+	}
+
+	static Vector angularRatesBetweenVectors(const Vector& u, const Vector& v)
+	{
+		return cross(u, v);
+	}
+
+	size_t printTo(Print& p) const {
+		return
+			p.print(x, 15) + p.print(" ") +
+			p.print(y, 15) + p.print(" ") +
+			p.print(z, 15);
+	}
+};