Summary
Identifies a direction within a 2D rectilinear grid.
Enum values
| 4 | Down (dx = 0, dy = 1). |
| 5 | Down and left (dx = -1, dy = 1). |
| 3 | Down and right (dx = 1, dy = 1). |
| 6 | Left (dx = -1, dy = 0). |
| 2 | Right (dx = 1, dy = 0). |
| 0 | Up (dx = 0, dy = -1). |
| 7 | Up and left (dx = -1, dy = -1). |
| 1 | Up and right (dx = 1, dy = -1). |