How to detect if a point is in a Circle?

Question

How can I test if a LatLng point is within the bounds of a circle? (Google Maps JavaScript v3)

The getBounds() method returns the bounding box for the circle, which

Answer 1

Something like this should do the trick (code not tested):

public boolean pointInCircle(Circle c, LatLng coord) {
  Rectangle r = c.getBounds();
  double rectX = r.getX();
  double rectY = r.getY();
  double rectWidth = r.getWidth();
  double rectHeight = r.getHeight();

  double circleCenterX = rectX + rectWidth/2;
  double circleCenterY = rectY + rectHeight/2;

  double lat = coord.getLatitude();
  double lon = coord.getLongitude();

  // Point in circle if (x−h)^2 + (y−k)^2 <= r^2
  double rSquared = Math.pow(rectWidth/2, 2);
  double point = Math.pow(lat - circleCenterX, 2) + Math.pow(lon - circleCenterY, 2);

  return (point <= rSquared) ? true : false;
}