From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 19 May 2013 18:14:28 +0000 (+0300)
Subject: Add multiplication and inversion operations to AffineTransformation
X-Git-Url: http://git.tdb.fi/?p=libs%2Fmath.git;a=commitdiff_plain;h=cfffb770e4dadddadb3657599811900be34244b6

Add multiplication and inversion operations to AffineTransformation
---

diff --git a/source/geometry/affinetransformation.h b/source/geometry/affinetransformation.h
index 93fb91a..430619e 100644
--- a/source/geometry/affinetransformation.h
+++ b/source/geometry/affinetransformation.h
@@ -62,6 +62,9 @@ public:
 	static AffineTransformation<T, D> scaling(const LinAl::Vector<T, D> &);
 	static AffineTransformation<T, D> shear(const LinAl::Vector<T, D> &, const LinAl::Vector<T, D> &);
 
+	AffineTransformation &operator*=(const AffineTransformation &);
+	AffineTransformation &invert();
+
 	const LinAl::SquareMatrix<T, D+1> &get_matrix() const { return matrix; }
 	operator const LinAl::SquareMatrix<T, D+1> &() const { return matrix; }
 
@@ -137,6 +140,34 @@ AffineTransformation<T, 3> AffineTransformationOps<T, 3>::rotation(const Angle<T
 	return r;
 }
 
+template<typename T, unsigned D>
+inline AffineTransformation<T, D> &AffineTransformation<T, D>::operator*=(const AffineTransformation<T, D> &other)
+{
+	matrix *= other.get_matrix();
+	return *this;
+}
+
+template<typename T, unsigned D>
+inline AffineTransformation<T, D> operator*(const AffineTransformation<T, D> &at1, const AffineTransformation<T, D> &at2)
+{
+	AffineTransformation<T, D> r = at1;
+	return r *= at2;
+}
+
+template<typename T, unsigned D>
+inline AffineTransformation<T, D> &AffineTransformation<T, D>::invert()
+{
+	matrix.invert();
+	return *this;
+}
+
+template<typename T, unsigned D>
+inline AffineTransformation<T, D> invert(const AffineTransformation<T, D> &at)
+{
+	AffineTransformation<T, D> r = at;
+	return r.invert();
+}
+
 
 template<typename T, unsigned N>
 inline LinAl::Vector<T, N+1> augment_vector(const LinAl::Vector<T, N> &v, T s)