Apply scaling to this matrix by scaling the X axis by <code>x</code> and the Y axis by <code>y</code>.
<p>
If <code>M</code> is <code>this</code> matrix and <code>S</code> the scaling matrix,
then the new matrix will be <code>M * S</code>. So when transforming a
vector <code>v</code> with the new matrix by using <code>M * S * v</code>, the
scaling will be applied first!
@param x
the factor of the x component
@param y
the factor of the y component
@return this
Apply scaling to this matrix by scaling the X axis by <code>x</code> and the Y axis by <code>y</code>. <p> If <code>M</code> is <code>this</code> matrix and <code>S</code> the scaling matrix, then the new matrix will be <code>M * S</code>. So when transforming a vector <code>v</code> with the new matrix by using <code>M * S * v</code>, the scaling will be applied first!
@param x the factor of the x component @param y the factor of the y component @return this