Intersect multiple circels

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Hi,

How Can I see if 2 or more circels intersect or touching each other?

What I have tried:

When using rectangle and the upper left corner touch the lower right corner the circles aren't really touching. but intersect return true

Posted 19-Apr-21 23:58pm

JR212

Updated 20-Apr-21 1:21am

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Richard MacCutchan 20-Apr-21 6:19am

You need to find points inside each circle that are common.

2 solutions

Solution 1

Not really a programming question, more like geometry.

Quote:
How Can I see if 2 or more circels intersect or touching each other?

Each circle is inside a rectangle, if both rectangle don't touch, circles don't touch.
if rectangles touch, you need to calc the distance between circle centers, if that distance is less than sum of diameters, circles touch.

Posted 20-Apr-21 0:28am

Patrice T

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CPallini 20-Apr-21 6:42am

5.

Patrice T 20-Apr-21 6:54am

Thank you again

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OriginalGriff · Accepted Answer · 2021-04-20T01:21:00

Solution 2

Don't even check the rectangle: get the value of the distance between circle centres and compare that to the sum of the diameters. If it's less then they overlap, if it's equal then they touch, if it's greater they are separate.

And it's easy to do: Pythagoras gives you the equation:
dist = √((Ax - Bx)² + (Ay - By)²)

Posted 20-Apr-21 1:21am

OriginalGriff

Comments

JR212 21-Apr-21 3:06am

Thanks