Blame mono/Assistance/Guideline.cs

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using System;
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using System.Collections.Generic;
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using Assistance.Drawing;
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namespace Assistance {
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	public class Guideline {
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		public static readonly Pen pen = new Pen("Light Gray");
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		public static readonly Pen penActive = new Pen("Deep Sky Blue");
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		public static readonly double snapLenght = 20.0;
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		public static readonly double snapScale = 1.0;
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		public static readonly double maxLenght = 20.0*snapLenght*snapScale;
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		public virtual Track.Point transformPoint(Track.Point point)
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			{ return point; }
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		public virtual void draw(Cairo.Context context, bool active) { }
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		public void draw(Cairo.Context context)
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			{ draw(context, false); }
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		public double calcTrackWeight(Track track) {
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			if (track.count < 1)
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				return double.PositiveInfinity;
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			double sumWeight = 0.0;
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			double sumLength = 0.0;
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			double sumDeviation = 0.0;
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			Point prev = track.getFirst().position;
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			foreach(Track.Point tp in track.points) {
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				Point p = tp.position;
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				double length = (p - prev).len();
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				sumLength += length;
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				double midStepLength = sumLength - 0.5*length;
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				if (midStepLength > Geometry.precision) {
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					double weight = length*Geometry.logNormalDistribuitionUnscaled(midStepLength, snapLenght, snapScale);
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					sumWeight += weight;
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					Track.Point ntp = transformPoint(tp);
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					double deviation = (ntp.position - p).len();
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					sumDeviation += weight*deviation;
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				}
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				prev = p;
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			}
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			if (sumWeight < Geometry.precision)
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				return double.PositiveInfinity;
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			return sumDeviation/sumWeight;
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		}
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		public static Guideline findBest(List<guideline> guidelines, Track track) {</guideline>
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			double bestWeight = 0.0;
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			Guideline best = null;
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			foreach(Guideline guideline in guidelines) {
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				double weight = guideline.calcTrackWeight(track);
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				if (best == null || weight < bestWeight) {
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					bestWeight = weight;
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					best = guideline;
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				}
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			}
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			return best;
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		}
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	}
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}
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