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osu.Game.Rulesets.Osu/Edit/OsuSelectionScaleHandler.cs

@@ -244,6 +244,7 @@ public Vector2 ClampScaleToPlayfieldBounds(Vector2 scale, Vector2? origin = null
 
  return scale;
 
+ // Clamps the scale vector s such that the point p scaled by s is within the rectangle defined by lowerBounds and upperBounds
  Vector2 clampToBound(Vector2 s, Vector2 p, Vector2 lowerBounds, Vector2 upperBounds)
  {
  p -= actualOrigin;
@@ -286,18 +287,25 @@ Vector2 clampToBound(Vector2 s, Vector2 p, Vector2 lowerBounds, Vector2 upperBou
  return s;
  }
 
+ // Computes the bounds for the magnitude of the scaled point p with respect to the bounds lowerBounds and upperBounds
  (float, float) computeBounds(Vector2 lowerBounds, Vector2 upperBounds, Vector2 p)
  {
  var sLowerBounds = Vector2.Divide(lowerBounds, p);
  var sUpperBounds = Vector2.Divide(upperBounds, p);
+
+ // If the point is negative, then the bounds are flipped
  if (p.X < 0)
  (sLowerBounds.X, sUpperBounds.X) = (sUpperBounds.X, sLowerBounds.X);
  if (p.Y < 0)
  (sLowerBounds.Y, sUpperBounds.Y) = (sUpperBounds.Y, sLowerBounds.Y);
+
+ // If the point is at zero, then any scale will have no effect on the point so the bounds are infinite
+ // The float division would already give us infinity for the bounds, but the sign is not consistent so we have to manually set it
  if (Precision.AlmostEquals(p.X, 0))
  (sLowerBounds.X, sUpperBounds.X) = (float.NegativeInfinity, float.PositiveInfinity);
  if (Precision.AlmostEquals(p.Y, 0))
  (sLowerBounds.Y, sUpperBounds.Y) = (float.NegativeInfinity, float.PositiveInfinity);
+
  return (MathF.Max(sLowerBounds.X, sLowerBounds.Y), MathF.Min(sUpperBounds.X, sUpperBounds.Y));
  }
  }