Implement ConstantScrollingSpeedVisualiser

osu.Game.Rulesets.Catch/UI/CatchPlayfield.cs

@@ -55,6 +55,8 @@ namespace osu.Game.Rulesets.Catch.UI
                     RelativeSizeAxes = Axes.Both,
                 },
             });
+
+            VisibleTimeRange.Value = BeatmapDifficulty.DifficultyRange(difficulty.ApproachRate, 1800, 1200, 450) / 1.2;
         }
 
         public bool CheckIfWeCanCatch(CatchHitObject obj) => catcherArea.AttemptCatch(obj);

osu.Game/Configuration/SpeedChangeVisualisationMethod.cs

@@ -10,6 +10,8 @@ namespace osu.Game.Configuration
         [Description("Sequential")]
         Sequential,
         [Description("Overlapping")]
-        Overlapping
+        Overlapping,
+        [Description("Constant")]
+        Constant
     }
 }

osu.Game/Rulesets/UI/Scrolling/ScrollingHitObjectContainer.cs

@@ -54,6 +54,9 @@ namespace osu.Game.Rulesets.UI.Scrolling
                 case SpeedChangeVisualisationMethod.Overlapping:
                     speedChangeVisualiser = new OverlappingSpeedChangeVisualiser(ControlPoints);
                     break;
+                case SpeedChangeVisualisationMethod.Constant:
+                    speedChangeVisualiser = new ConstantSpeedChangeVisualiser();
+                    break;
             }
         }
 

osu.Game/Rulesets/UI/Scrolling/Visualisers/SequentialSpeedChangeVisualiser.cs

@@ -61,7 +61,7 @@ namespace osu.Game.Rulesets.UI.Scrolling.Visualisers
 
             foreach (var obj in hitObjects)
             {
-                var finalPosition = hitObjectPositions[obj] - timelinePosition;
+                var finalPosition = (hitObjectPositions[obj] - timelinePosition);
 
                 switch (direction)
                 {