code: static boolean isInCircle(float x, float y, float centerX, float centerY, float
              radius) {
          return Math.abs(x - centerX) < radius && Math.abs(y - centerY) < radius;
      }
docs: Check if a position is within a circle
  
  @param x       x position
  @param y       y position
  @param centerX center x of circle
  @param centerY center y of circle
  @return true if within circle, false otherwise