port from perforce

aiwaz/AiwazAnimator/HistoricalFloat.cs

@@ -0,0 +1,77 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+using System.Windows.Media;
+
+namespace AiwazAnimator
+{
+    public class HistoricalFloat : FrameworkElement
+    {
+        private List<Func<float>> ObservableFloats;
+        private Dictionary<Func<float>, List<float>> History;
+
+        public HistoricalFloat()
+        {
+            ObservableFloats = new List<Func<float>>();
+            History = new Dictionary<Func<float>, List<float>>();
+        }
+
+        public void Add(Func<float> ObservableFloat)
+        {
+            ObservableFloats.Add(ObservableFloat);
+            History[ObservableFloat] = new List<float>();
+        }
+
+        public void Tick()
+        {
+            foreach (var f in ObservableFloats)
+            {
+                History[f].Add(f());
+                while (History[f].Count > 128)
+                    History[f].RemoveAt(0);
+            }
+
+            this.InvalidateVisual();
+        }
+
+        protected override void OnRender(DrawingContext dc)
+        {
+            base.OnRender(dc);
+
+            SolidColorBrush b = new SolidColorBrush();
+            b.Color = Colors.Black;
+            Pen p = new Pen(Brushes.Green, 1);
+            dc.DrawRectangle(b, p, new Rect(this.RenderSize));
+
+            int y = 0;
+            int height = 50;
+            foreach (var f in ObservableFloats)
+            {
+                float x = 128 - History[f].Count;
+                Point oldPoint = new Point(-1, -1);
+                foreach (var val in History[f])
+                {
+                    float newVal = val;
+                    if (newVal > 1)
+                        newVal = 1;
+                    if (newVal < 0)
+                        newVal = 0;
+                    Point newPoint = new Point((x * RenderSize.Width) / 128, y + 2 + height * (1.0f - newVal));
+                    if (oldPoint.X != -1)
+                        dc.DrawLine(p, oldPoint, newPoint);
+                    x++;
+                    oldPoint = newPoint;
+                }
+                y += height + 4;
+            }
+        }
+    }
+}