# Find the closest point

This post is the third installment from my post (How to detect a collision between a circle and a line).  In this post I will show how to find the closest point to a point or circle. It is pretty straight forward after you know how to determine the distance between 2 points.

If you want to know the closest point to a circle then just use the center of the circle for the next part. So to measure the distance between 2 points use this code:

```float d(pt P, pt Q) {
return sqrt(d2(P, Q));
};                                                       // ||AB|| (Distance)
float d2(pt P, pt Q) {
return sq(Q.x-P.x)+sq(Q.y-P.y);
};                                             // AB*AB (Distance squared)```

You would use the ‘d’ method to cycle through your point array to find the closest point. Here is my code that I used to find the closest point to a circle:

```int findClosePt(pt[] A, pt B){  // takes in a point array and point to compare
int nearest  ;
float temp; //
for (int i=0; i```

I hope this helps out anyone out there.

Posted by in Coding

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