public void transformBy(Matrix matrix) {
    if (vecs == null) vecs = new float[2];
    vecs[0] = dx;
    vecs[1] = dy;
    matrix.mapVectors(vecs);

    dx = vecs[0];
    dy = vecs[1];
    radius = matrix.mapRadius(radius);
  }
Settings for a drop shadow to apply.
lottie/src/main/java/com/airbnb/lottie/utils/DropShadow.java