angle between three points please help

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Eliska Paulikova 2022-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/1859878-angle-between-three-points-please-help

评论： Torsten 2022-11-23

for f=1:h
    t=(f-1)*k/20;
    m=f+1;
    P0=[171.5 239.5]; %střed [x,y]
    P1=[htabulka(1,1),htabulka(1,2)]; %XY1 [x,y]
    P2=[htabulka(f,1),htabulka(f,2)]; %XY2 [x,y]
    ang = atan2(norm(det([P2-P0;P1-P0])),dot(P2-P0,P1-P0));
    angst=ang*180/pi
    cosf=cos(angst);
    ....

I have this part of code

I have a object rotating --> but this angle only gives me max 30 degrees but that is not posible becaouse the object is making circle

one point the center is always the same, than the beginning point is also the same, and one point is moving due to video --> so the degrees suposed to get from 0 to 360 but it gives me this