Implement basic logic

osu.Game/Screens/Play/HUD/HitErrorDisplay.cs

@@ -77,6 +77,19 @@ namespace osu.Game.Screens.Play.HUD
                 case ScoreMeterType.HitErrorRight:
                     createBar(true);
                     break;
+
+                case ScoreMeterType.ColourBoth:
+                    createColour(false);
+                    createColour(true);
+                    break;
+
+                case ScoreMeterType.ColourLeft:
+                    createColour(false);
+                    break;
+
+                case ScoreMeterType.ColourRight:
+                    createColour(true);
+                    break;
             }
         }
 
@@ -90,6 +103,24 @@ namespace osu.Game.Screens.Play.HUD
                 Alpha = 0,
             };
 
+            completeDisplayLoading(display);
+        }
+
+        private void createColour(bool rightAligned)
+        {
+            var display = new ColourHitErrorMeter(hitWindows)
+            {
+                Margin = new MarginPadding(margin),
+                Anchor = rightAligned ? Anchor.CentreRight : Anchor.CentreLeft,
+                Origin = rightAligned ? Anchor.CentreRight : Anchor.CentreLeft,
+                Alpha = 0,
+            };
+
+            completeDisplayLoading(display);
+        }
+
+        private void completeDisplayLoading(HitErrorMeter display)
+        {
             Add(display);
             display.FadeInFromZero(fade_duration, Easing.OutQuint);
         }

osu.Game/Screens/Play/HUD/HitErrorMeters/ColourHitErrorMeter.cs

@@ -0,0 +1,33 @@
+// 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.Linq;
+using osu.Framework.Allocation;
+using osu.Framework.Extensions.Color4Extensions;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Colour;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Framework.Graphics.Sprites;
+using osu.Game.Graphics;
+using osu.Game.Rulesets.Judgements;
+using osu.Game.Rulesets.Scoring;
+using osuTK;
+using osuTK.Graphics;
+
+namespace osu.Game.Screens.Play.HUD.HitErrorMeters
+{
+    public class ColourHitErrorMeter : HitErrorMeter
+    {
+        public ColourHitErrorMeter(HitWindows hitWindows)
+            : base(hitWindows)
+        {
+
+        }
+
+        public override void OnNewJudgement(JudgementResult judgement)
+        {
+            throw new System.NotImplementedException();
+        }
+    }
+}