Blame mono/Assistance/ModifierSnowflake.cs

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using System;
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using System.Collections.Generic;
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namespace Assistance {
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	public class ModifierSnowflake: Modifier {
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		public class Modifier: Track.Modifier {
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			Point center, px, py;
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			public Modifier(Track.Handler handler, Point center, double angle, bool flip):
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				base(handler)
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			{
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				this.center = center;
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				double s = Math.Sin(angle);
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				double c = Math.Cos(angle);
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				if (flip) { px = new Point(c, s); py = new Point(s,-c); }
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				     else { px = new Point(c,-s); py = new Point(s, c); }
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			}
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			public InputManager.KeyPoint.Holder holder = null;
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			public List<guideline> guidelines = new List<guideline>();</guideline></guideline>
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			public override Track.Point calcPoint(double originalIndex) {
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				Track.Point p = base.calcPoint(originalIndex);
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				Point pp = p.position - center;
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				p.position = center + new Point(Point.dot(pp, px), Point.dot(pp, py));
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				return p;
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			}
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		}
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		public ActivePoint center;
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		public int rays;
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		public ModifierSnowflake(Document document, Point center, int rays = 6): base(document) {
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			this.center = new ActivePoint(this, ActivePoint.Type.CircleCross, center);
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			this.rays = rays;
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		}
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		public override void draw(Cairo.Context context) {
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			for(int i = 0; i < rays/2; ++i) {
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				Point pp0 = center.position;
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				Point pp1 = center.position + new Point(100.0, 0.0).rotate( i*2.0*Math.PI/(double)rays );
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				Rectangle bounds = Drawing.Helper.getBounds(context);
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				Geometry.truncateInfiniteLine(bounds, ref pp0, ref pp1);
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				context.Save();
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				pen.apply(context);
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				context.MoveTo(pp0.x, pp0.y);
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				context.LineTo(pp1.x, pp1.y);
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				context.Stroke();
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				context.Restore();
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			}
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		}
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		public override void modify(Track track, InputManager.KeyPoint keyPoint, List<track> outTracks) {
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			if (track.handler == null) {
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				track.handler = new Track.Handler(this, track);
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				for(int i = 0; i < rays; ++i) {
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					double angle = i*2.0*Math.PI/(double)rays;
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					track.handler.tracks.Add(new Track( new Modifier(track.handler, center.position, angle, false) ));
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					track.handler.tracks.Add(new Track( new Modifier(track.handler, center.position, angle, true) ));
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				}
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			}
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			outTracks.AddRange(track.handler.tracks);
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			if (!track.isChanged)
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				return;
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			int start = track.points.Count - track.wayPointsAdded;
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			if (start < 0) start = 0;
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			foreach(Track subTrack in track.handler.tracks) {
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				// remove points
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				if (start < subTrack.points.Count) {
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					subTrack.wayPointsRemoved += subTrack.points.Count - start;
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					subTrack.points.RemoveRange(start, subTrack.points.Count - start);
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				}
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				// add points
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				for(int i = start; i < track.points.Count; ++i)
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					subTrack.points.Add( subTrack.modifier.calcPoint(i) );
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				subTrack.wayPointsAdded += subTrack.points.Count - start;
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			}
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			track.wayPointsRemoved = 0;
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			track.wayPointsAdded = 0;
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		}
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	}
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}
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