private bool isPathObstructed(Position origin, Position destination)
{
Figure figure = this.boardState[origin.x][origin.y];
if (figure == null)
{
return(false);
}
if (figure is Knight)
{
return(false);
}
// Bishop same-row move
if (origin.x == destination.x && origin.x - destination.x > 1)
{
int smallerOfTheTwo = origin.y > destination.y ? destination.y : origin.y;
int largerOfTheTwo = origin.y > destination.y ? origin.y : destination.y;
for (int i = smallerOfTheTwo; i < largerOfTheTwo; i++)
{
if (this.boardState[i][origin.y] != null)
{
// There is a piece that is in between therefore in this board state it is illegal.
return(true);
}
}
}
else if (origin.y == destination.y && origin.y - destination.y > 1)
{
int smallerOfTheTwo = origin.x > destination.x ? destination.x : origin.x;
int largerOfTheTwo = origin.x > destination.x ? origin.x : destination.x;
for (int i = smallerOfTheTwo; i < largerOfTheTwo; i++)
{
if (this.boardState[origin.x][i] != null)
{
// There is a piece that is in between therefore in this board state it is illegal.
return(true);
}
}
}
else // Must be either a bishop or knight specific move
// Out of those, only a bishop move can be obstructed
{
int xDelta;
if (destination.x > origin.x)
{
xDelta = -1;
}
else
{
xDelta = 1;
}
int yDelta;
if (destination.y > origin.y)
{
yDelta = -1;
}
else
{
yDelta = 1;
}
Position startPosition = origin;
while (startPosition.IsValidPosition(this.BoardSize) && startPosition.x != destination.x && startPosition.y != destination.y)
{
if (this.boardState[startPosition.x][startPosition.y] != null)
{
// This diagonal is obstructed and this move is illegal
return(true);
}
startPosition.x += xDelta;
startPosition.y += yDelta;
}
}
return(false);
}
