@Override
  public boolean equals(Object o) {
    return o instanceof SwirlFilterTransformation &&
      ((SwirlFilterTransformation) o).radius == radius &&
      ((SwirlFilterTransformation) o).angle == radius &&
      ((SwirlFilterTransformation) o).center.equals(center.x, center.y);
  }
@param radius from 0.0 to 1.0, default 0.5
@param angle  minimum 0.0, default 1.0
@param center default (0.5, 0.5)
transformations/src/main/java/jp/wasabeef/glide/transformations/gpu/SwirlFilterTransformation.java