code: public Matrix3 setToTransform (IVector translation, double rotation, double scale) {
          return setToRotation(rotation).set(m00 * scale, m10 * scale, translation.x(),
                                             m01 * scale, m11 * scale, translation.y(),
                                             0f, 0f, 1f);
      }
docs: Sets this to a matrix that first scales, then rotates, then translates.
  
  @return a reference to this matrix, for chaining.