public boolean equals(Object object) {
if (!(object instanceof ShapeEdge)) return false;
ShapeEdge edge = (ShapeEdge) object;
if (startPoint.equals(edge.getStartPoint()) && endPoint.equals(edge.getEndPoint())) return true;
if (startPoint.equals(edge.getEndPoint()) && endPoint.equals(edge.getStartPoint())) return true;
return false;
}
public boolean coincides(ShapeEdge other) {
if (this.isHorizontal() && other.isVertical()) return false;
if (other.isHorizontal() && this.isVertical()) return false;
return false;
}