How to measure angle of intersection ?
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I need to calculate the angle of intersection . Can anyone share the coding ? How to find the angle (red shaded region) ? Thank you.

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Rik
2019년 4월 9일
Do you have the locations of the two lines involved? Then you could fit two linear functions and use mathematics to find the angle.
A. Sawas
2019년 4월 9일
I reposted the solution below and added some comments. Please comment on the solution if this is not what you are looking for.
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A. Sawas
2019년 4월 9일
편집: A. Sawas
2019년 4월 9일
Assuming that the two lines are defined by four points P1, P2, P3, and P4 as such, the first line is L1(P1,P2) and the second line L2 (P3,P4) you can find the angle using the following code:
% define the points as [x,y]
P1 = [1,1];
P2 = [5,5];
P3 = [5,2];
P4 = [1,3];
% dx = x1 - x2;
dx1 = P1(1)-P2(1);
dx2 = P3(1)-P4(1);
% dy = y1 - y2;
dy1 = P1(2)-P2(2);
dy2 = P3(2)-P4(2);
% the angle (in degrees) between the lines:
angle = 180 - acosd((dx1*dx2+dy1*dy2)/(sqrt(dx1^2+dx2^2)*sqrt(dy1^2+dy2^2)));
disp(angle);
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