/// <summary>
/// Solve the multiplication
/// </summary>
/// <param name="pivot">The pivot diagonal</param>
/// <param name="tp">The type of diagonal</param>
/// <param name="multSize">The size of the product</param>
/// <returns>The multiplication product</returns>
private long GridMultiplication(ref int[] pivot, GridMultiplicationType tp, int multSize)
{
int x = pivot[0],
y = pivot[1];
long res = this.Grid[pivot[0], pivot[1]];
for (int i = 0; i < multSize - 1; i++)
{
try
{
UpdatePivot(ref pivot, tp);
}
catch (Exception)
{
pivot[0] = x;
pivot[1] = y;
return(0);
}
res *= this.Grid[pivot[0], pivot[1]];
}
pivot[0] = x;
pivot[1] = y;
return(res);
}
private void UpdatePivot(ref int[] pivot, GridMultiplicationType tp)
{
switch (tp)
{
case GridMultiplicationType.LeftBottomDiagonal:
UpdatePivot(ref pivot, GridMultiplicationType.Left);
UpdatePivot(ref pivot, GridMultiplicationType.Down);
break;
case GridMultiplicationType.LeftUpDiagonal:
UpdatePivot(ref pivot, GridMultiplicationType.Left);
UpdatePivot(ref pivot, GridMultiplicationType.Up);
break;
case GridMultiplicationType.RightBottomDiagonal:
UpdatePivot(ref pivot, GridMultiplicationType.Right);
UpdatePivot(ref pivot, GridMultiplicationType.Down);
break;
case GridMultiplicationType.RightUpDiagonal:
UpdatePivot(ref pivot, GridMultiplicationType.Right);
UpdatePivot(ref pivot, GridMultiplicationType.Up);
break;
default:
switch (tp)
{
case GridMultiplicationType.Down:
pivot[0] += 1;
if (pivot[0] >= this.Grid.GetUpperBound(1))
{
throw new Exception("Invalid operation");
}
break;
case GridMultiplicationType.Up:
pivot[0] -= 1;
if (pivot[0] < 0)
{
throw new Exception("Invalid operation");
}
break;
case GridMultiplicationType.Left:
pivot[1] -= 1;
if (pivot[1] < 0)
{
throw new Exception("Invalid operation");
}
break;
case GridMultiplicationType.Right:
pivot[1] += 1;
if (pivot[1] >= this.Grid.GetUpperBound(0))
{
throw new Exception("Invalid operation");
}
break;
}
break;
}
}
