Added traceable mod + HideButApproachCircle function for DrawableHitCircle

osu.Game.Rulesets.Osu/Mods/OsuModTraceable.cs

@@ -0,0 +1,32 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System.Collections.Generic;
+using osu.Game.Graphics;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Objects.Drawables;
+using osu.Game.Rulesets.Osu.Objects.Drawables;
+
+namespace osu.Game.Rulesets.Osu.Mods
+{
+    internal class OsuModTraceable : Mod, IApplicableToDrawableHitObjects
+    {
+        public override string Name => "Traceable";
+        public override string ShortenedName => "TC";
+        public override FontAwesome Icon => FontAwesome.fa_snapchat_ghost;
+        public override ModType Type => ModType.Fun;
+        public override string Description => "Put your faith in the approach circles...";
+        public override double ScoreMultiplier => 1;
+
+        public void ApplyToDrawableHitObjects(IEnumerable<DrawableHitObject> drawables)
+        {
+            foreach (var drawable in drawables)
+            {
+                if (drawable is DrawableHitCircle c)
+                    c.HideButApproachCircle();
+                if (drawable is DrawableSlider s)
+                    s.HeadCircle.HideButApproachCircle();
+            }
+        }
+    }
+}

osu.Game.Rulesets.Osu/Objects/Drawables/DrawableHitCircle.cs

@@ -76,6 +76,15 @@ namespace osu.Game.Rulesets.Osu.Objects.Drawables
             }
         }
 
+        public void HideButApproachCircle()
+        {
+            circle.Hide();
+            circle.AlwaysPresent = true;
+            ring.Hide();
+            number.Hide();
+            glow.Hide();
+        }
+
         protected override void CheckForResult(bool userTriggered, double timeOffset)
         {
             if (!userTriggered)

osu.Game.Rulesets.Osu/OsuRuleset.cs

@@ -121,6 +121,7 @@ namespace osu.Game.Rulesets.Osu
                     return new Mod[] {
                         new OsuModTransform(),
                         new OsuModWiggle(),
+                        new OsuModTraceable(),
                     };
                 default:
                     return new Mod[] { };