Tidy up Slider class.

osu.Game.Mode.Osu/Objects/SliderCurve.cs

@@ -0,0 +1,44 @@
+using System.Collections.Generic;
+using OpenTK;
+
+namespace osu.Game.Modes.Osu.Objects
+{
+    public class SliderCurve
+    {
+        public double Length;
+
+        public List<Vector2> Path;
+
+        public CurveTypes CurveType;
+
+        private List<Vector2> calculatedPath;
+
+        public void Calculate()
+        {
+            switch (CurveType)
+            {
+                case CurveTypes.Linear:
+                    calculatedPath = Path;
+                    break;
+                default:
+                    var bezier = new BezierApproximator(Path);
+                    calculatedPath = bezier.CreateBezier();
+                    break;
+            }
+        }
+
+        public Vector2 PositionAt(double progress)
+        {
+            progress = MathHelper.Clamp(progress, 0, 1);
+
+            double index = progress * (calculatedPath.Count - 1);
+            int flooredIndex = (int)index;
+
+            Vector2 pos = calculatedPath[flooredIndex];
+            if (index != flooredIndex)
+                pos += (calculatedPath[flooredIndex + 1] - pos) * (float)(index - flooredIndex);
+
+            return pos;
+        }
+    }
+}