Intersecting Two Lines with Varying Angle

Question

Erkin Karatas 2019-12-8

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评论： Erkin Karatas 2019-12-9

Hi all,

I want to plot two intersecting lines, the most important point of the part is the angle of intersection. The angle between the lines depend on

L = 15.24;  
F = 5; 
S =20; 
D = 10.16;  
R = 146; 
 
theta = 2* atan(((L-F)*S) / (D*R))
 

As I change the variables above, the angle of intersection of two lines should change. The lines are just for visual their values in the x-y axis do not represent anything.

Thank you

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Answer 1

Turlough Hughes 2019-12-8

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So I understand you just want to plot two lines where there is a specific angle between them. If we take one line as line y=0, you could plot them as follows:

plot([-D*R D*R],[-(L-F)*S (L-F)*S])
axis([-1 1 -1 1]) % set axis limits, this shows 2 units on x and y axis and they have a 1:1 ratio
set(gcf,'Position',[100 100 400 400]) % This is to adjust the figure size with corresponding 1:1 ratio.
hold on, plot([-1 1],[0 0],'-k'), title(['theta = ' num2str(theta,'%.2f') ' radians']) %show angle in title