toDir4

Converts the current Dir8 value to the corresponding Dir4 value based on the given rotation direction.

The toDir4 function maps each Dir8 value to a base Dir4 value and adjusts the mapping based on the specified rotation direction.

How it works:

1. Determine the base Dir4 value: The function maps each Dir8 value to a base Dir4 value.

2. Adjust based on rotation direction: Depending on whether the rotation is clockwise or counterclockwise, the function adjusts the mapping to include the next or previous Dir8 value.

Examples:

• Clockwise Rotation:

• UP and UP_RIGHT both map to UP.

• RIGHT and DOWN_RIGHT both map to RIGHT.

• DOWN and DOWN_LEFT both map to DOWN.

• LEFT and UP_LEFT both map to LEFT.

• Counterclockwise Rotation:

• UP and UP_LEFT both map to UP.

• RIGHT and UP_RIGHT both map to RIGHT.

• DOWN and DOWN_RIGHT both map to DOWN.

• LEFT and DOWN_LEFT both map to LEFT.

Parameters