using System;

using System.Drawing;

using System.Drawing.Imaging;

using System.Collections.Generic;

namespace Assistance {

	public class GuidelineLine: Guideline {

		protected Point p0, p1;

		protected Point direction;

		public GuidelineLine(Point p0, Point p1) {

			this.p0 = p0;

			this.p1 = p1;

			direction = (p1 - p0).normalize();

		}

		public override void draw(Graphics g, bool active) {

			Point pp0 = p0;

			Point pp1 = p1;

			Geometry.truncateInfiniteLine(new Rectangle(g.VisibleClipBounds), ref pp0, ref pp1);

			g.DrawLine(active ? penActive : pen , pp0.toFloat(), pp1.toFloat());

		}

		public override Point transformPoint(Point p) {

			return Point.dot(p - p0, direction)*direction + p0;

		}

	}

}