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fix: correct tail collision logic in SnakeGame and Snake

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This commit is contained in:
Heller
2026-06-17 19:04:32 +00:00
parent 0d9710965c
commit 7330880c96
2 changed files with 9 additions and 5 deletions
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9
Snake.Core/Snake.cs
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@@ -55,8 +55,13 @@ public sealed class Snake
return newHead; return newHead;
} }
public bool Occupies(Position position) => public bool Occupies(Position position, bool excludeTail = false)
_segments.Contains(position); {
if (excludeTail && _segments.Last is { } last && last.Value == position)
return false;
return _segments.Contains(position);
}
private static Position DirectionToOffset(Direction direction) => private static Position DirectionToOffset(Direction direction) =>
direction switch direction switch

5
Snake.Core/SnakeGame.cs
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@@ -39,14 +39,13 @@ public sealed class SnakeGame
return GameTickResult.GameOver; return GameTickResult.GameOver;
var newHead = Snake.PeekNextHead(); var newHead = Snake.PeekNextHead();
var ateFood = newHead == Food.Position;
if (!Board.IsWithinBounds(newHead) || Snake.Occupies(newHead)) if (!Board.IsWithinBounds(newHead) || Snake.Occupies(newHead, excludeTail: !ateFood))
{ {
IsGameOver = true; IsGameOver = true;
return GameTickResult.GameOver; return GameTickResult.GameOver;
} }
var ateFood = newHead == Food.Position;
Snake.Move(grow: ateFood); Snake.Move(grow: ateFood);
if (ateFood) if (ateFood)