finding covered regions created by intersecting random lines
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hey, i am trying to find covered areas by random lines as seen in the figure (i need to produce much complex structures). The intersects (or node points) are kept in a Sparse matrix. (I manually added a red dot as an example)
2 个评论
John D'Errico
2021-3-14
Are you looking only for regions that are entirely enclosed in 2-d by some set of line segments?
Mustafa Codur
2021-3-14
编辑：Mustafa Codur
2021-3-14
回答（1 个）
darova
2021-3-14
Here is the method using bwlabel
clear
clc
I = zeros(100);
% random coordinates of lines
x = rand(20,2)*98+1;
y = rand(20,2)*98+1;
% horizontal and vertical lenghts
dx = abs(diff(x,[],2));
dy = abs(diff(y,[],2));
for i = 1:size(x,1)
n = max(dx(i),dy(i)); % max length
n = round(n);
x1 = linspace(x(i,1),x(i,2),n);
y1 = linspace(y(i,1),y(i,2),n);
ind = sub2ind(size(I),round(y1),round(x1));
I(ind) = 1; % burn line
end
[I1,m] = bwlabel(~I,4); % separate each region
imshow(I1,rand(n,3))
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2021-3-14
2021-3-14
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