using System;

using System.Drawing;

using System.Drawing.Imaging;

using System.Collections.Generic;

namespace Assistance {

	public class Assistant {

		public static readonly double maxLen = 1000.0;

		public static readonly int gridPointsCount = 100;

		public static readonly Pen pen = Pens.Gray;

		public static readonly Pen guidePen = Pens.LightGray;

		public readonly Workarea canvas;

		public readonly List<activepoint> points = new List<activepoint>();</activepoint></activepoint>

		public Assistant(Workarea canvas) {

			this.canvas = canvas;

			canvas.assistants.Add(this);

		}

		public void remove() {

			foreach(ActivePoint point in points)

				canvas.points.Remove(point);

			canvas.assistants.Remove(this);

		}

		public void bringToFront() {

			canvas.assistants.Remove(this);

			canvas.assistants.Add(this);

		}

		public double getMaxLen() {

			double l = 0.0;

			foreach(ActivePoint point in points)

				l = Math.Max(l, point.position.len());

			return maxLen + l;

		}

		public virtual void onMovePoint(ActivePoint point, Point position) {

			point.position = position;

		}

		public virtual Point[] getGridPoints(Point target, bool truncate) { return new Point[0]; }

		public Point[] getGridPoints(Point target) { return getGridPoints(target, false); }

		public virtual void draw(Graphics g) { }

		public virtual void drawGuidlines(Graphics g, Point target, bool truncate) { }

		public void drawGuidlines(Graphics g, Point target) {

			drawGuidlines(g, target, false);

		}

		public virtual double calcTrackWeight(Track track) {

			return double.PositiveInfinity;

		}

		public virtual Track modifyTrack(Track track) {

			return new Track();

		}

	}

}