Compass direction <=> degree measure abstract for Haxe. Useful for me, maybe for you.

Direction.hx

package entities;
import nape.geom.Vec2;

/**
 * @author MSGHero
 */

@:enum
abstract Direction(Int) {
	
    var E = 0;
    var NE = 45;
    var N = 90;
    var NW = 135;
    var W = 180;
    var SW = 225;
    var S = 270;
    var SE = 315;
    var NONE = -1;
	
    @:from
    public static function fromInt(i:Int):Direction {
        
        // not using mod: [-360, 720) range
        if (i < 0) i += 360;
        if (i >= 360) i -= 360;
        
        return switch (i) {
            case 0: E;
            case 45: NE;
            case 90: N;
            case 135: NW;
            case 180: W;
            case 225: SW;
            case 270: S;
            case 315: SE;
            case _: NONE;
        }
    }
    
    @:to
    public inline function toInt():Int {
        if (this < 0) this += 360;
        if (this >= 360) this -= 360;
        return this;
    }
	
    @:to
    public function toVec2():Vec2 {
        
        return Vec2.get(
        // x
            switch (this) {
                case Direction.E: 1;
                case Direction.W: -1;
                case Direction.NE, Direction.SE: .707;
                case Direction.NW, Direction.SW: -.707;
                case _: 0;
            },
            // y
            switch (this) {
                case Direction.S: 1;
                case Direction.N: -1;
                case Direction.NW, Direction.NE: -.707;
                case Direction.SW, Direction.SE: .707;
                case _: 0;
            }
         };
    }
    
    @:op(A + B) public function add(rhs:Direction):Direction {
        return fromInt(this + rhs.toInt());
    }
    @:op(A - B) public function sub(rhs:Direction):Direction {
        return fromInt(this - rhs.toInt());
    }
    @:op(++A) public inline function incPre():Direction {
        this += 45;
        return fromInt(this);
    }
    @:op(A++) public inline function incPost():Direction {
    	var d = fromInt(this);
        this += 45;
        return d;
    }
    @:op(--A) public inline function decPre():Direction {
        this -= 45;
        return fromInt(this);
    }
    @:op(A--) public inline function decPost():Direction {
    	var d = fromInt(this);
        this -= 45;
        return d;
    }
}