Implementing 3D-Touch

[enstulen]

I want to implement 3D-Touch and change the linewidth based on the pressure.
In the touchesMoved I use this code to change the lineWidth:

    CGFloat maximumPossibleForce = touch.maximumPossibleForce;
    CGFloat force = touch.force;
    CGFloat normalizedForce = force/maximumPossibleForce;
    CGFloat lineWidth = normalizedForce * 10;
    self.currentTool.lineWidth = lineWidth;

It works, however, when crossing lines with a previously drawn line, it overrides it.
If anyone knows a solution I would greatly appreciate it! Thanks :)

[enstulen]

Picture:

[BlaXun]

I got a similar problem when rotating the view.... I also get such annoying fragments :S