how to filter out the line that intersects with another line?

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Sierra
Sierra 2022-10-11
编辑： Matt J 2022-10-11
I want to filter out the line when it intersects with another line.
I only need the line before instecting with another line.
I found the function that calculate intersection point. but in my case i don't need a point. I just need to filter out the line after intersection.
Thanks.
  2 个评论
Jan
Jan 2022-10-11
@Sierra: What are the inputs? How are the lines defined? With start and end point, or with start point, direction an lengths?
What does "filter out" mean? Having the intersection point sounds like the solution, because it is the new end point.

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Matt J
Matt J 2022-10-11
You can use intersectionHull from this FEX download,
https://www.mathworks.com/matlabcentral/fileexchange/30892-analyze-n-dimensional-convex-polyhedra
Use the upward sloping line to define inequality constraints for the desired region.
  1 个评论
Matt J
Matt J 2022-10-11
编辑：Matt J 2022-10-11
For example,
V1=[-1 +1;
+2 -2]; %downsloping line
V2=[-1 -1;
+1 +1]; %upsloping line
[~,~,A,b]=vert2lcon(V2)
V3=intersectionHull('vert',V1,'lcon',A,b).vert;
close all
lfn=@(v,varargin) line(v(:,1),v(:,2),varargin{:});
lfn(V1)
lfn(V2)
lfn(V3,Color='r',Marker='o')
shg

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