Implement Circle header, rename all files to use .hpp extension.

include/J3ML/LinearAlgebra/Transform2D.hpp

@@ -0,0 +1,40 @@
+#pragma once
+
+
+#include <J3ML/LinearAlgebra/Matrix3x3.hpp>
+
+namespace J3ML::LinearAlgebra {
+    class Transform2D {
+    protected:
+        Matrix3x3 transformation;
+    public:
+
+        const static Transform2D Identity;
+        const static Transform2D FlipX;
+        const static Transform2D FlipY;
+
+        Transform2D(float rotation, const Vector2& pos);
+        Transform2D(float px, float py, float sx, float sy, float ox, float oy, float kx, float ky, float rotation)
+        {
+            transformation = Matrix3x3(px, py, rotation, sx, sy, ox, oy, kx, ky);
+        }
+        Transform2D(const Vector2& pos, const Vector2& scale, const Vector2& origin, const Vector2& skew, float rotation);
+        Transform2D(const Matrix3x3& transform);
+        Transform2D Translate(const Vector2& offset) const;
+        Transform2D Translate(float x, float y) const;
+        Transform2D Scale(float scale);           // Perform Uniform Scale
+        Transform2D Scale(float x, float y);      // Perform Nonunform Scale
+        Transform2D Scale(const Vector2& scales); // Perform Nonuniform Scale
+        Transform2D Rotate();
+        Vector2 Transform(const Vector2& input) const;
+        Transform2D Inverse() const;
+        Transform2D AffineInverse() const;
+        float Determinant() const;
+        Vector2 GetOrigin() const;
+        float GetRotation() const;
+        Vector2 GetScale() const;
+        float GetSkew() const;
+        Transform2D OrthoNormalize();
+    };
+}
+