Add hawku/TabletDriver TabletFilterSmoothing

Author: InfinityGhost

TabletDriverFilters/TabletFilterSmoothing.cs

@@ -0,0 +1,62 @@
+using System;
+using TabletDriverPlugin;
+using TabletDriverPlugin.Attributes;
+using TabletDriverPlugin.Tablet;
+
+namespace TabletDriverFilters
+{
+    using static Math;
+
+    [PluginName("TabletDriver Smoothing Filter")]
+    public class TabletFilterSmoothing : IFilter
+    {
+        private DateTime? _lastFilterTime;
+        private Point _lastPos;
+
+        public Point Filter(Point point)
+        {
+            var timeDelta = DateTime.Now - _lastFilterTime;
+            // If a time difference hasn't been established or it has been 100 milliseconds since the last filter
+            if (timeDelta == null || timeDelta.Value.TotalMilliseconds > 100)
+            {
+                SetPreviousState(point);
+                return point;
+            }
+            else
+            {
+                Point pos = new Point(point.X, point.Y);
+                float deltaX = point.X - _lastPos.X;
+                float deltaY = point.Y - _lastPos.Y;
+
+                float stepCount = Latency / TimerInterval;
+                float target = 1 - Threshold;
+                float weight = 1f - (1f / (float)Pow(1 / target, 1 / stepCount));
+
+                pos.X += deltaX * weight;
+                pos.Y += deltaY * weight;
+                SetPreviousState(point);
+                return pos;
+            }
+        }
+
+        private void SetPreviousState(Point lastPosition)
+        {
+            _lastPos = lastPosition;
+            _lastFilterTime = DateTime.Now;
+        }
+
+        public FilterStage FilterStage => FilterStage.PreTranspose;
+
+        [SliderProperty("Latency", 0f, 5f, 2f)]
+        public float Latency { set; get; }
+
+        [SliderProperty("Weight", 0f, 1f, 1f)]
+        public float Weight { set; get; }
+
+        [SliderProperty("Threshold", 0f, 1f, 0.9f)]
+        public float Threshold { set; get; }
+
+        [UnitProperty("Timer Interval", "hz")]
+        public float TimerInterval { set; get; }
+    }
+}