// Try to connect grid_cell with this cell. Connection can be established only when any two cells of both grid cells are connected. This function should behave
// properly when called multiple times for the same pair of grid cells!
public void AddNeighbour(GridCell grid_cell)
{
if (GlobalId == grid_cell.GlobalId || !AABB.Overlaps2D(grid_cell.AABB, true))
{
return;
}
// this is removed to properly handle merging
//if (Neighbours.Exists(x => x.cell.Equals(grid_cell)))
// return;
bool any_cells_connected = false;
MovementFlag connection_flags = MovementFlag.None;
foreach (Cell our_cell in Cells)
{
foreach (Cell other_cell in grid_cell.Cells)
{
Vec3 border_point = default(Vec3);
bool cells_connected = our_cell.AddNeighbour(other_cell, ref border_point);
if (cells_connected)
{
any_cells_connected = true;
MovementFlag flags = our_cell.Flags & other_cell.Flags;
if (flags > connection_flags)
{
connection_flags = flags;
}
}
}
}
if (any_cells_connected)
{
Neighbour n1 = Neighbours.FirstOrDefault(x => x.cell.GlobalId == grid_cell.GlobalId);
// if they were not connected before, simply connect them
if (n1 == null)
{
Neighbours.Add(new Neighbour(grid_cell, Vec3.ZERO, connection_flags));
grid_cell.Neighbours.Add(new Neighbour(this, Vec3.ZERO, connection_flags));
}
// otherwise verify connection flags
else if (n1.connection_flags < connection_flags)
{
Neighbour n2 = grid_cell.Neighbours.FirstOrDefault(x => x.cell.GlobalId == GlobalId);
n1.connection_flags = connection_flags;
n2.connection_flags = connection_flags;
}
}
}
/// <summary>
/// Gets the previous level in a linear level sequence.
/// Only valid for LinearHorizontal and LinearVertical layouts.
/// Returns null if this is the first level.
/// </summary>
public Level GetPreviousNeighbour(WorldLayout worldLayout)
{
switch (worldLayout)
{
case WorldLayout.LinearHorizontal:
return(Neighbours.FirstOrDefault(level => level.IsWest));
case WorldLayout.LinearVertical:
return(Neighbours.FirstOrDefault(level => level.IsNorth));
}
Debug.LogWarning($"LDtk: Tried getting previous neighbour with an invalid world layout: {worldLayout}");
return(null);
}
/// <summary>
/// Retrieve node
/// </summary>
/// <param name="element"></param>
/// <returns></returns>
public Node <T> GetNode(T element)
{
var node = Neighbours.FirstOrDefault(x => x.NodeContent.Equals(element));
return(node);
}