static Point blendPoints(Point x, Point y, double yish) {
  double xish = 1-yish;
  ret new Point((int) (x.x*xish+y.x*yish), (int) (x.y*xish+y.y*yish));
}

static Pt blendPoints(Pt x, Pt y, double yish) {
  double xish = 1-yish;
  ret new Pt((int) (x.x*xish+y.x*yish), (int) (x.y*xish+y.y*yish));
}

static Pt blendPoints(Pt x, double xf, Pt y, double yf) {
  ret new Pt((int) (x.x*xf+y.x*yf), (int) (x.y*xf+y.y*yf));
}

static Pt blendPoints(int x1, int y1, int x2, int y2, double yish) {
  ret blendPoints(new Pt(x1, y1), new Pt(x2, y2), yish);
}