Blame mono/Assistance/GuidelineLine.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 GuidelineLine: Guideline {
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		protected Point p0, p1;
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		protected Point direction;
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		public GuidelineLine(Point p0, Point p1) {
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			this.p0 = p0;
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			this.p1 = p1;
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			direction = (p1 - p0).normalize();
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		}
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		public override void draw(Cairo.Context context, bool active) {
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			Point pp0 = p0;
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			Point pp1 = p1;
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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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			(active ? penActive : 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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		public override Point transformPoint(Point p) {
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			return Point.dot(p - p0, direction)*direction + p0;
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		}
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	}
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}
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