/**
  * Gets the minimum X ordinate.
  *
  * @return the minimum X ordinate
  */
 public double minX() {
   return Math.min(p0.x, p1.x);
 }
 /**
  * Gets the minimum Y ordinate.
  *
  * @return the minimum Y ordinate
  */
 public double minY() {
   return Math.min(p0.y, p1.y);
 }