Question

i have an array that stores indexes of cells in a 4X4 grid, 0, 1, 2, 3, etc. I know that directly next to item 0 is item 1 (to the right) and item 4 (below). How would i write a function that returns indexes of cells that are directly next to the index passed in?

function getCellsAround(0)
{
     should return 1 and 4
}

Answer 1

public static ArrayList<Point> getPointsAround(Point p, Rectangle r) {
    ArrayList<Point> points = new ArrayList<Point>();
    for(int dx = -1; dx <= 1; dx++) {
        for(int dy=-1; dy <= 1; dy++) {
            if(dx!=0 || dy !=0) {
                Point point = new Point(p.x+dx, p.y+dy);
                if(r.contains(point)) {
                    points.add(point);
                }
            }
        }
    }
    return points;
}

Something like that? That uses x, y coordinates (Point class) rather than just:

(1, 2, 3

4, 5, 6)