Calculating a distance between a point and a contour along an axis

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Minyoung Hong 2022-6-30

评论： Minyoung Hong 2022-7-4

I would like to implement an code to realiyze the calculation between a point and a countour of an cloud point along the x axis in 2D (blue line).

The lines are drawn with line() and the redpoint is only temporary.

After that, I would like to make a code to calculate a distance with any angle (green line).

Could anyone give me a tip or help me for that?

Thank you in advance.

KSSV 2022-6-30

Let O(x,y) be your red point.

You can get the blue line intersecting the contour using knnsearch.

If you want to draw a line of length L with angle a w.r.t horizontal i.e. blue line.

%L is the length of line and a is angle 
x2=x+(L*cos(a));
y2=y+(L*sin(a));
plot([x x2],[y y2])

Matt J 2022-6-30

@Minyoung Hong if KSSV's answer led to a solution for you, you should Accept-click it.

Minyoung Hong 2022-7-4

@Matt J Oh I am sorry. I did it now.

MATLAB Graphics 2-D and 3-D Plots Contour Plots

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