/**
* User undo a click.
*/
private void Undo_Click(object sender, EventArgs e)
{
if (step.Count == 0 || move <= 0) // should not undo under these circumstances
{
return;
}
Point_coord tmp = (Point_coord)step.Pop();
int x = tmp.x;
int y = tmp.y;
FlipPlus(x, y);
move--;
moveCount.Text = move.ToString();
}
/**
* A light button is clicked. Flip the color of this button and buttons around.
*/
private void Button_Click(object sender, EventArgs e)
{
Button curr = (Button)sender;
string name = curr.Name;
name.ToCharArray();
int i = name[1] - '0';
int j = name[2] - '0';
FlipPlus(i, j);
move++; // increase the count of user click
Point_coord coord = new Point_coord(i, j);
step.Push(coord); // record the move
moveCount.Text = move.ToString();
CheckWin();
}