diff options
Diffstat (limited to 'src/Xanthous/Data.hs')
| -rw-r--r-- | src/Xanthous/Data.hs | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/Xanthous/Data.hs b/src/Xanthous/Data.hs index ff11a8da7f80..b7df191e58a8 100644 --- a/src/Xanthous/Data.hs +++ b/src/Xanthous/Data.hs @@ -136,7 +136,8 @@ diffPositions (Position x₁ y₁) (Position x₂ y₂) = Position (x₁ - x₂) -- -- ∀ dir :: Direction. isUnit ('asPosition' dir) isUnit :: Position -> Bool -isUnit (Position px py) = abs px == 1 || abs py == 1 +isUnit (Position px py) = + abs px `elem` [0,1] && abs py `elem` [0, 1] && (px, py) /= (0, 0) -------------------------------------------------------------------------------- |