Trying to get edge pieces only on canvas.

[himanshu19890]

Hello, thanks for this excellent library.I am experimenting with it and trying to get only edge pieces on canvas.I am modifying the puzzle constructor like below code.

  public Puzzle(Context c, Bitmap[] images, String location, int width, int height, Difficulty d) {
    for (int i = 0; i < images.length; i++) {
        if(pg.isEdge(i, width, height)){
            edgePieces.add(new Piece(c, images[i], d.getOffset()));
        }
        else{
            pieces.add(new Piece(c, images[i], d.getOffset()));
        }
    }

    this.width = width;
    findNeighbors(width);
}

But every time app throws error on line:- if(pg.isEdge(i, width, height)){ . I think isEdge method is not working.Please help me to get rid of this error.

Thanks in advance