Add jngl::Mat3::scale(float, float)

src/jngl/Mat3.cpp

@@ -30,7 +30,11 @@ Mat3& Mat3::translate(const jngl::Vec2& v) {
 }
 
 Mat3& Mat3::scale(const float factor) {
-	return *this *= boost::qvm::diag_mat(boost::qvm::vec<float, 3>{ { factor, factor, 1 } });
+	return scale(factor, factor);
+}
+
+Mat3& Mat3::scale(const float xfactor, const float yfactor) {
+	return *this *= boost::qvm::diag_mat(boost::qvm::vec<float, 3>{ { xfactor, yfactor, 1 } });
 }
 
 Mat3& Mat3::rotate(const float radian) {

src/jngl/Mat3.hpp

@@ -27,13 +27,24 @@ class Mat3 {
 	/// Multiplies the matrix with a translation matrix generated from v
 	///
 	/// \return *this
-	Mat3& translate(const Vec2&);
+	Mat3& translate(const Vec2& v);
 
 	/// Multiplies the matrix by a scaling matrix
 	///
+	/// Equivalent to calling `Mat3::scale(factor, factor)`.
 	/// \return *this
 	Mat3& scale(float factor);
 
+	/// Multiplies the matrix by a scaling matrix
+	///
+	/// \return *this
+	///
+	/// If you want to draw a sprite with double the width, but the correct height:
+	/// \code
+	/// yourSprite.draw(jngl::modelview().scale(2, 1));
+	/// \endcode
+	Mat3& scale(float xfactor, float yfactor);
+
 	/// Multiplies the matrix with a rotation matrix
 	///
 	/// \return *this