/* Calculates the amount of rows the tetromino must be moved up
* to touch the top of the grid. */
private int CalculatePreviewRowOffset(Tetromino piece)
{
/* Startvalue of -1 as 0 is a valid row. */
int row = -1;
/* Loop through the entire grid or until a block has been found. */
for (int i = 0; i < piece.Width && row == -1; i++)
{
for (int j = 0; j < piece.Width; j++)
{
if (piece.GetBlock(i, j))
{
row = i;
break;
}
}
}
return(-row);
}
