Line drawing

Hi,

I would like to draw 12 lines linking two endpoints pt_orth_int and pt_orth_ext, for that I wrote this part of code :

for i=1:12
   xx(i,:) = [pt_orth_int(i,2) pt_orth_ext(i,2)];
   yy(i,:) = [pt_orth_int(i,1) pt_orth_ext(i,1)];

   line(xx(i,:),yy(i,:),'LineWidth',2,'Color','y');
end

The problem I have is only the 12th line was drawn in my figure and not the totality of them. I think it is a problem of overwriting, would you please help me to fix it ?

Thank you !

Answer 1

[Image Analyst]

Try putting this code in the loop after the call to line().

if i == 1
  hold on;
end

Answer 2

[Jan]

The line command handles matrices also:

xx = [pt_orth_int(1:12, 2), pt_orth_ext(1:12, 2)];
yy = [pt_orth_int(1:12, 1), pt_orth_ext(1:12, 1)];
line(xx, yy, 'LineWidth', 2, 'Color','y');

Perhaps xx and yy must be transposed - I cannot test this currently.

Answer 3

[K BV]

I added the "hold on" statement where did suggest Image Analyst and used the matrices xx and yy as suggested by Jan Simon.

Now I have all my lines and I can finish my tracking program :)

Thank you again !