Apply rotation about the origin to this matrix by rotating the given amount of radians.
<p>
The produced rotation will rotate a vector counter-clockwise around the origin.
<p>
If <code>M</code> is <code>this</code> matrix and <code>R</code> the rotation matrix,
then the new matrix will be <code>M * R</code>. So when transforming a
vector <code>v</code> with the new matrix by using <code>M * R * v</code>
, the rotation will be applied first!
<p>
Reference: <a href="https://en.wikipedia.org/wiki/Rotation_matrix#In_two_dimensions">http://en.wikipedia.org</a>
Apply rotation about the origin to this matrix by rotating the given amount of radians. <p> The produced rotation will rotate a vector counter-clockwise around the origin. <p> If <code>M</code> is <code>this</code> matrix and <code>R</code> the rotation matrix, then the new matrix will be <code>M * R</code>. So when transforming a vector <code>v</code> with the new matrix by using <code>M * R * v</code> , the rotation will be applied first! <p> Reference: <a href="https://en.wikipedia.org/wiki/Rotation_matrix#In_two_dimensions">http://en.wikipedia.org</a>
@param angle the angle in radians @return this