How does Manhattan and Euclidean distance combine to control grease pencil input? I read the wiki (https://wiki.blender.org/index.php/Doc:DE/2.6/Manual/3D_interaction/Sketching/Drawing)
and I can understand the difference among the definitions, as I understand it says the same with different words, also the hints.




if I set Euclidean value to 100px I can predict that Manhattan distance will control the minimum distance to draw the new gp point, but if I set a 0 or 1 or 10 on the Euclidean changing the Manhattan distance doesn't do any evident change. 

So I'm trying to understand this and I'm feeling a bit lost here.
On this picture from Wikipedia green is Euclidean distance , rest - Manhattan distances. If the square was 10 by 10, then  Mathattan distance is 20, Euclidean sqrt(200), so around 14. So Euclidean distance  will be the real distance the mouse traveled, Manhattan - the number of pixels it travelled. Although it seems Blender uses the number of pixels per axis (probably taking maximum rather than summing them). In this case Manhattan distance will be 10.