How to calculate the CW and CCW direction of finger touch?

Projects Programming
1

Hi all.
the two group datas from my ILI9341 touch screen by finger draw on it, how to get which draw is toward which direction by what calculation please?
Thanks
Adam

Cw:

x1: 82     y1: 3333     
x2: 1527     y2: 1562

CCW:

x1: 3519     y1: 2834     
x2: 2830     y2: 3512

0.0

2

If 0,0 is top-left and MAXx,MAXy is bottom right:

In section A:
CW: X increases while Y decreases
CCW: X decreases while Y increases

In section B:
CW: X increases while Y remains constant
CCW: X decreases while Y remains constant

Secton C:
CW: X remains constant while Y increases
CCW: X remains constant while Y decreases

(repeat for sections D through I)

screen

1 Like
3

Seems to me that it would be best to capture 3 data points (say P0, P1, P2). Then convert them to polar coordinates -- with their average used as the center of your polar coordinate system. Then note if theta increases or decreases as you progress from P0 to P1 to P2.

EDIT:
Actually, given the three points, you can determine the center of the circle to use as the origin of the polar coordinate system.

2 Likes
4

Thanks.
I'll try it.

5

Thanks.
I'll test it.

6

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