public class Line {

	private Point start;
	private Point end;

	public Line(double x1, double y1, double x2, double y2) {
		this.start= new Point(x1, y1);
		this.end= new Point(x2, y2);
	}

	public Line(Point p1, Point p2) {
		this.start=new Point(p1);
		this.end=new Point(p2);
	}

	public Line(Line that) {
		this.start=new Point(that.start);
		this.start=new Point(that.end);
	}

	public Point getStart() {
		return start;
	}

	public Point getEnd() {
		return end;
	}

	public double getStartX() {
		return start.getX();
	}

	public double getStartY() {
		return start.getY();
	}

	public double getEndX() {
		return end.getX();
	}

	public double getEndY() {
		return end.getY();
	}

	public void setStart(Point newStart) {
		start=newStart;
	}

	public void setEnd(Point newEnd) {
		end=newEnd;
	}

	public void setEndX(double x) {
		end.setX(x);
	}

	public double length() {
		return Math.sqrt(Math.pow(start.getX()-end.getX(), 2)+
				Math.pow(start.getY()-end.getY(), 2));
	}

	public Point midpoint() {
		return new Point((start.getX()+end.getX())/2,
				(start.getY()+end.getY())/2);
	}

}