pathReverser.js

exports.reversePath = function(path)
{
	var reversedPath = [];

	for(var i = 0; i < path.length; i++)
	{
		var currentStep = path[i];

		var dx = currentStep.dx * -1;
		var dy = currentStep.dy * -1;

		var x = currentStep.x - currentStep.dx;
		var y = currentStep.y - currentStep.dy;

		var direction = ((currentStep.direction + 4) % 8);

		if(direction === 0) direction = 8;

		reversedPath.unshift({x: x, y: y, dx: dx, dy: dy, direction: direction});
	}

	return reversedPath;
}

exports.reversePath = function(path)
{
    var reversedPath = [];

    for(var currentStep of path){ // ES6 supported

        var dx = currentStep.dx * -1;
        var dy = currentStep.dy * -1;

        var x = currentStep.x - currentStep.dx;
        var y = currentStep.y - currentStep.dy;

        var direction = ((currentStep.direction + 3) % 8) + 1; // substruct 1 from 4 and add 1 after to shift start by 1, to prevent if

        reversedPath.unshift({x: x, y: y, dx: dx, dy: dy, direction: direction});
    }

    return reversedPath;
}