Initial Commit

Charts/Filters/InclinationFilter.cs

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+using System;
+using System.Collections.Generic;
+using System.Windows;
+using Microsoft.Research.DynamicDataDisplay.Charts.Filters;
+
+namespace Microsoft.Research.DynamicDataDisplay.Filters
+{
+	[Obsolete("Works incorrectly", true)]
+	public sealed class InclinationFilter : PointsFilterBase
+	{
+		private double criticalAngle = 179;
+		public double CriticalAngle
+		{
+			get { return criticalAngle; }
+			set
+			{
+				if (criticalAngle != value)
+				{
+					criticalAngle = value;
+					RaiseChanged();
+				}
+			}
+		}
+
+		#region IPointFilter Members
+
+		public override List<Point> Filter(List<Point> points)
+		{
+			if (points.Count == 0)
+				return points;
+
+			List<Point> res = new List<Point> { points[0] };
+
+			int i = 1;
+			while (i < points.Count)
+			{
+				bool added = false;
+				int j = i;
+				while (!added && (j < points.Count - 1))
+				{
+					Point x1 = res[res.Count - 1];
+					Point x2 = points[j];
+					Point x3 = points[j + 1];
+
+					double a = (x1 - x2).Length;
+					double b = (x2 - x3).Length;
+					double c = (x1 - x3).Length;
+
+					double angle13 = Math.Acos((a * a + b * b - c * c) / (2 * a * b));
+					double degrees = 180 / Math.PI * angle13;
+					if (degrees < criticalAngle)
+					{
+						res.Add(x2);
+						added = true;
+						i = j + 1;
+					}
+					else
+					{
+						j++;
+					}
+				}
+				// reached the end of resultPoints
+				if (!added)
+				{
+					res.Add(points.GetLast());
+					break;
+				}
+			}
+			return res;
+		}
+
+		#endregion
+	}
+}