right-handed DirectionVector

include/J3ML/LinearAlgebra/DirectionVector.hpp

@@ -0,0 +1,20 @@
+#pragma once
+#include <J3ML/LinearAlgebra/Vector3.hpp>
+
+namespace J3ML::LinearAlgebra {
+    class DirectionVectorRH;
+}
+
+/// Direction vector of a given Matrix3x3 RotationMatrix in a Right-handed coordinate space.
+class J3ML::LinearAlgebra::DirectionVectorRH : public Vector3 {
+private:
+    // This is purposefully not exposed because these types aren't usually convertable.
+    explicit DirectionVectorRH(const Vector3& rhs);
+public:
+    static DirectionVectorRH Forward(const Matrix3x3& rhs);
+    static DirectionVectorRH Backward(const Matrix3x3& rhs);
+    static DirectionVectorRH Left(const Matrix3x3& rhs);
+    static DirectionVectorRH Right(const Matrix3x3& rhs);
+    static DirectionVectorRH Up(const Matrix3x3& rhs);
+    static DirectionVectorRH Down(const Matrix3x3& rhs);
+};

include/J3ML/LinearAlgebra/Forward.hpp

@@ -15,6 +15,7 @@ namespace J3ML::LinearAlgebra
     class Matrix4x4;
     class Transform2D;
     class Transform3D;
+    class DirectionVectorRH; // A type representing a direction in 3D space.
     class Quaternion;
 
 

src/J3ML/LinearAlgebra/DirectionVector.cpp

@@ -0,0 +1,38 @@
+#include <J3ML/LinearAlgebra/DirectionVector.hpp>
+#include <J3ML/LinearAlgebra/Matrix3x3.hpp>
+
+DirectionVectorRH::DirectionVectorRH(const Vector3& rhs) {
+    x = rhs.x;
+    y = rhs.y;
+    z = rhs.z;
+}
+
+DirectionVectorRH DirectionVectorRH::Forward(const Matrix3x3& rhs) {
+    return DirectionVectorRH(rhs.Col(2));
+}
+
+DirectionVectorRH DirectionVectorRH::Backward(const Matrix3x3& rhs) {
+    return DirectionVectorRH(-rhs.Col(2));
+}
+
+DirectionVectorRH DirectionVectorRH::Left(const Matrix3x3& rhs) {
+    return DirectionVectorRH(-rhs.Col(0));
+}
+
+DirectionVectorRH DirectionVectorRH::Right(const Matrix3x3& rhs) {
+    return DirectionVectorRH(rhs.Col(0));
+}
+
+DirectionVectorRH DirectionVectorRH::Up(const Matrix3x3 &rhs) {
+    return DirectionVectorRH(rhs.Col(1));
+}
+
+DirectionVectorRH DirectionVectorRH::Down(const Matrix3x3& rhs) {
+    return DirectionVectorRH(-rhs.Col(1));
+}
+
+
+
+
+
+