Initial commit

include/Spectre/Math/Transform.h

@@ -0,0 +1,78 @@
+
+#ifndef SPECTRE_MATH_TRANSFORM_H
+#define SPECTRE_MATH_TRANSFORM_H
+
+#include "Vector2.h"
+#include "Matrix4.h"
+
+// Class representing a transformation matrix.
+
+class Transform
+{
+public :
+
+	// Constructors
+	Transform();
+
+	Transform(const Matrix4f& matrix);
+
+	Transform(float a00, float a01, float a02,
+		  float a10, float a11, float a12,
+		  float a20, float a21, float a22);
+
+	// Shorthand for applying translate/rotate/scale.
+	// Order of operations:
+	//	1. translate
+	//	2. rotate
+	//	3. scale
+	void set(Vector2f translate, float rotate, Vector2f scale);
+
+	void setMatrix(const Matrix4f& matrix);
+
+	// Reset the transformation (Identity matrix).
+	void reset();
+
+	// Axis.
+	Vector2f getUpVector() const;
+	Vector2f getRightVector() const;
+
+	// Translation
+
+	Transform& translate(float x, float y);
+	Transform& translate(Vector2f offset);
+
+	// Rotation
+
+	Transform& rotate(float theta);
+
+	// Scale
+
+	Transform& scale(float x, float y);
+	Transform& scale(Vector2f offset);
+	Transform& scale(float s);
+
+	Transform& multiply(const Transform& other);
+
+	Vector2f transformPoint(float x, float y) const;
+
+	Vector2f transformPoint(const Vector2f& v) const;
+
+	// Get the transformation as a 4x4 matrix.
+	Matrix4f& getMatrix();
+	const Matrix4f& getMatrix() const;
+
+	Matrix4f getRotationMatrix() const;
+
+	float* getRawMatrix();
+	const float* getRawMatrix() const;
+
+protected :
+	Matrix4f m_matrix;
+};
+
+Transform  operator*(const Transform& a, const Transform& b);
+Transform& operator*=(Transform& a, const Transform& b);
+
+Vector2f operator*(const Transform& t, const Vector2f& v);
+
+#endif /* SPECTRE_MATH_TRANSFORM_H */