Initial Commit

Charts/Filters/FrequencyFilter2.cs

@@ -0,0 +1,90 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Microsoft.Research.DynamicDataDisplay.Charts.Filters;
+using System.Windows;
+
+namespace Microsoft.Research.DynamicDataDisplay.Filters
+{
+	public class FrequencyFilter2 : PointsFilterBase
+	{
+		private Rect screenRect;
+		public override void SetScreenRect(Rect screenRect)
+		{
+			this.screenRect = screenRect;
+		}
+
+		public override List<Point> Filter(List<Point> points)
+		{
+			List<Point> result = new List<Point>();
+
+			using (var enumerator = points.GetEnumerator())
+			{
+				double currentX = Double.NegativeInfinity;
+
+				double minX = 0, maxX = 0, minY = 0, maxY = 0;
+
+				Point left = new Point(), right = new Point(), top = new Point(), bottom = new Point();
+
+				bool isFirstPoint = true;
+				while (enumerator.MoveNext())
+				{
+					Point currPoint = enumerator.Current;
+					double x = currPoint.X;
+					double y = currPoint.Y;
+					double xInt = Math.Floor(x);
+					if (xInt == currentX)
+					{
+						if (x > maxX)
+						{
+							maxX = x;
+							right = currPoint;
+						}
+
+						if (y > maxY)
+						{
+							maxY = y;
+							top = currPoint;
+						}
+						else if (y < minY)
+						{
+							minY = y;
+							bottom = currPoint;
+						}
+					}
+					else
+					{
+						if (!isFirstPoint)
+						{
+							result.Add(left);
+
+							Point leftY = top.X < bottom.X ? top : bottom;
+							Point rightY = top.X > bottom.X ? top : bottom;
+
+							if (top != bottom)
+							{
+								result.Add(leftY);
+								result.Add(rightY);
+							}
+							else if (top != left)
+								result.Add(top);
+
+							if (right != rightY)
+								result.Add(right);
+						}
+
+						currentX = xInt;
+						left = right = top = bottom = currPoint;
+						minX = maxX = x;
+						minY = maxY = y;
+					}
+
+					isFirstPoint = false;
+				}
+			}
+
+			return result;
+		}
+	}
+}