/*
        This function moves to an existing unit or object with x, y properties.
        It can also accept a preset unit.
        If you want to go to a preset unit based on its area, type and id, use Pather.moveToPreset().
    */
    moveToUnit: function (unit, offX, offY, clearPath) { // Maybe use range instead of offsets
        switch (arguments.length) {
        case 1:
            offX = 0;
        case 2:
            offY = 0;
        case 3:
            clearPath = false;
            break;
        }

        if (!unit || !unit.hasOwnProperty("x") || !unit.hasOwnProperty("y")) {
            throw new Error("moveToUnit: Invalid unit.");
        }

        if (unit instanceof PresetUnit) {
            return this.moveTo(unit.roomx * 5 + unit.x + offX, unit.roomy * 5 + unit.y + offY, 2, clearPath);
        }

        return this.moveTo(unit.x + offX, unit.y + offY, 2, clearPath);
    },