Example of a custom cpp class Ball with boolean methods

Ball.h

#include "ofApp.h" //include ofApp so you can use OF defined functions and vars
class Ball {

  public:
    Ball();//constructor
    ~Ball();//destructor
    //current ball position, you'll need to initialize 
    //this somewhere in your constructor or another method
    ofVec2f mBallPos;
    bool checkIntersects(const ofVec2f &positionToCheck);
}

//implementation of your Ball methods
bool Ball::checkPosition(const ofVec2f &positionToCheck){
  if(ofDist(positionToCheck.x, positionToCheck.y, mBallPos.x, mBallPos.y) < 5.0f){
    return true;
  }
  return false;
}


//somewhere in ofApp.cpp
if (ball.checkPosition(ofVec2f(45.0f,23.0f))){
  //set your ofApp public variable to true here
}
else {
  //set your ofApp public variable to false here
}