Rename grid to DistanceSnap to be more in line with its purpose

osu.Game/Screens/Edit/Compose/Components/CircularDistanceSnapGrid.cs

@@ -0,0 +1,59 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.UserInterface;
+using osu.Game.Rulesets.Objects;
+using osuTK;
+
+namespace osu.Game.Screens.Edit.Compose.Components
+{
+    public abstract class CircularDistanceSnapGrid : DistanceSnapGrid
+    {
+        protected CircularDistanceSnapGrid(HitObject hitObject, Vector2 centrePosition)
+            : base(hitObject, centrePosition)
+        {
+        }
+
+        protected override void CreateContent(Vector2 centrePosition)
+        {
+            float dx = Math.Max(centrePosition.X, DrawWidth - centrePosition.X);
+            float dy = Math.Max(centrePosition.Y, DrawHeight - centrePosition.Y);
+            float maxDistance = new Vector2(dx, dy).Length;
+
+            int requiredCircles = (int)(maxDistance / DistanceSpacing);
+
+            for (int i = 0; i < requiredCircles; i++)
+            {
+                float radius = (i + 1) * DistanceSpacing * 2;
+
+                AddInternal(new CircularProgress
+                {
+                    Origin = Anchor.Centre,
+                    Position = centrePosition,
+                    Current = { Value = 1 },
+                    Size = new Vector2(radius),
+                    InnerRadius = 4 * 1f / radius,
+                    Colour = GetColourForBeatIndex(i)
+                });
+            }
+        }
+
+        public override Vector2 GetSnapPosition(Vector2 position)
+        {
+            Vector2 direction = position - CentrePosition;
+
+            if (direction == Vector2.Zero)
+                direction = new Vector2(0.001f, 0.001f);
+
+            float distance = direction.Length;
+
+            float radius = DistanceSpacing;
+            int radialCount = Math.Max(1, (int)Math.Round(distance / radius));
+
+            Vector2 normalisedDirection = direction * new Vector2(1f / distance);
+            return CentrePosition + normalisedDirection * radialCount * radius;
+        }
+    }
+}