overlap between between multiple circles using circcirc

2017 3 24
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更新时间：2019 12 20
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Hi all,
I have 10 circles with random center positions but with same radius (but the radius, R= r1:r2). I want to find the intersection points where these circles overlap with eachother at each value of the radius. How can I find these points/ x,y coordinates using the circcirc function inside a for loop?
Thank you.

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Asatur Khurshudyan
Asatur Khurshudyan 2019-12-20
编辑：Asatur Khurshudyan 2019-12-20
Did you find the answer? I encountered the same problem. This post seem to give an answer.

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回答（1 个）

Image Analyst
Image Analyst 2017-3-24

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Try poly2mask()

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KalMandy
KalMandy 2017-3-24
Thank you. can you explain a little bit more? The poly2mask() content seems hard to understand.
Image Analyst
Image Analyst 2017-3-24
What EXACTLY do you want to know? Let's say that you have 10 circles. Do you want to know
  1. The (x,y) coordinates of where circle #1 overlaps circle #2
  2. The (x,y) coordinates of where circle #1 overlaps circle #3
  3. The (x,y) coordinates of where circle #1 overlaps circle #4
  4. The (x,y) coordinates of where circle #1 overlaps circle #5
  5. The (x,y) coordinates of where circle #1 overlaps circle #6
  6. The (x,y) coordinates of where circle #1 overlaps circle #7
  7. The (x,y) coordinates of where circle #1 overlaps circle #8
  8. The (x,y) coordinates of where circle #1 overlaps circle #9
  9. The (x,y) coordinates of where circle #1 overlaps circle #10
  10. The (x,y) coordinates of where circle #2 overlaps circle #3
  11. The (x,y) coordinates of where circle #2 overlaps circle #4
  12. The (x,y) coordinates of where circle #2 overlaps circle #5
  13. The (x,y) coordinates of where circle #2 overlaps circle #6
and so on - a full factorial of every possible combination of every circle overlapping with every other circle? If so, WHY ? Explain the user case.
Or do you just want the (x,y) coordinates of where the perimeters cross? If so, you can just set the two equations equal to each other and solve for x and y using solve(), or roots() or something like that.
KalMandy
KalMandy 2017-3-25
编辑：KalMandy 2017-3-25
Hi, thanks for the reply. I want to know,
1. The (x,y) coordinates of the intersection point between circle #1 and circle #2
2. The (x,y) coordinates of the intersection point between circle #1 and circle #3
3. The (x,y) coordinates of the intersection point between circle #1 and circle #4.
.
.
.
.
.
10. The (x,y) coordinates of the intersection point between circle #2 and circle #3
11. The (x,y) coordinates of the intersection point between circle #2 and circle #4 etc
I think circcirc function can find these intersection points,
[xout,yout] = circcirc(x1,y1,r1,x2,y2,r2)
currently, my code is as follows,
R=0.05:0.01:0.2;
for z=1:length (R)
for i=1:10
for j=1:10
[xout,yout] = circcirc(xB(i),yB(i),R(z),xB(j),yB(j),R(z));
end
end
end
but with this I cannot get the coordinates for all the cases. I only get the answer for the final case in the for loops.
Image Analyst
Image Analyst 2017-3-25
In some cases there will not be coordinates since the circles do not overlap.
KalMandy
KalMandy 2017-3-25
yes i know, my problem is the way i have written [xout,yout] =circcirc... .This only gives the answer for the last case (intersection between circle 9 and 10 with radius r2). maybe it has to be written [xout(i),yout(i)] ?? but this doesnot work too.

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