Order Points for plotting

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Ahmed Abdulla
Ahmed Abdulla on 24 May 2022
Commented: Ahmed Abdulla on 24 May 2022
I have the coordinates of the above two shapes imported from a CAD software, however when I plot the shape the points are not in order. Is there a method to order the coordinates so that points on the perimeter of the shape that are side by side are next to each other in the matrix.
If there is any mathematical method that would help me, I am willing to understand it and code it myself. Thank you
  5 Comments
Ahmed Abdulla
Ahmed Abdulla on 24 May 2022
@Walter Roberson Here I am using a shrink factor of 1 which is the highest I can go :(

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Answers (1)

KSSV
KSSV on 24 May 2022
load('A.mat') ;
x = A(:,1) ; y = A(:,2) ;
n = length(x) ;
iwant = zeros(n,2) ;
i = 1 ;
iwant(i,:) = [x(i) y(i)] ;
x(i) = [] ; y(i) = [] ;
while ~isempty(x)
i = i+1;
idx = knnsearch([x y],iwant(i-1,:));
iwant(i,:) = [x(idx) y(idx)] ;
x(idx) = [] ; y(idx)= [];
end
iwant(end+1,:) = iwant(1,:) ;
plot(iwant(:,1),iwant(:,2))
  3 Comments
Ahmed Abdulla
Ahmed Abdulla on 24 May 2022
Thank you @KSSV for your efforts I really appreciate it. Unfortunately this doesnt work every time and I am trying to make a generalised function that will work for any shape and at all times

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