//Check that a node can be created here
private int GetTerrainCost(int x, int y)
{
//Check the boundary
if (!_boundary.Contains(x, y))
{
return(-1);
}
TerrainPoint node = _terrain.Get(x, y);
if (node.IsEmpty)
{
return(0);
}
return(-1);
}
//Check the terrain between the two points
private bool CheckTerrain(Point a, Point b)
{
if (_terrain.Count == 0)
{
return(true);
}
int start;
int end;
if (a.X == b.X)
{
if (a.Y < b.Y)
{
start = a.Y;
end = b.Y;
}
else
{
start = b.Y;
end = a.Y;
}
}
else
{
if (a.X < b.X)
{
start = a.X;
end = b.X;
}
else
{
start = b.X;
end = a.X;
}
}
//Round the start and end onto the grid
start = Convert.ToInt32(start / _grain) * _grain;
end = Convert.ToInt32(end / _grain) * _grain;
//Round the other coordinate of the pair
int div = (a.X == b.X) ? a.X : a.Y;
div = Convert.ToInt32(div / _grain) * _grain;
//Get the starting movement cost
TerrainPoint node = _terrain.Get(div, start);
int cost = (node.IsEmpty) ? 0 : -1;
//Loop through the terrain checking for a node with movement cost
for (int i = start; i < end; i += _grain)
{
node = new TerrainPoint();
if (a.X == b.X)
{
node = _terrain.Get(div, i);
}
else
{
node = _terrain.Get(i, div);
}
if (!node.IsEmpty)
{
return(false);
}
}
return(true);
}
