public MapSegmentPathTile FindStartTile(ICollection <MapSegmentPathTile> tiles, MapSegmentDirection direction)
{
foreach (var tile in tiles)
{
if (MapSegmentPathTile.IsFree(tile.NeighbourUp))
{
return(tile);
}
}
// In theory; this is not possible
return(null);
}
public MapSegmentTraverseResult GetNextNode(MapSegmentTraverseResult lastStep)
{
if (lastStep.Direction == MapSegmentDirection.Up)
{
var nextTile = lastStep.PathTile.NeighbourRight;
if (MapSegmentPathTile.IsFree(nextTile))
{
return(new MapSegmentTraverseResult {
PathTile = lastStep.PathTile, Direction = MapSegmentDirection.Right
});
}
else
{
if (MapSegmentPathTile.IsFree(nextTile.NeighbourUp))
{
return(new MapSegmentTraverseResult {
PathTile = nextTile, Direction = lastStep.Direction
});
}
else
{
return(new MapSegmentTraverseResult {
PathTile = nextTile.NeighbourUp, Direction = MapSegmentDirection.Left
});
}
}
}
else if (lastStep.Direction == MapSegmentDirection.Right)
{
var nextTile = lastStep.PathTile.NeighbourDown;
if (MapSegmentPathTile.IsFree(nextTile))
{
return(new MapSegmentTraverseResult {
PathTile = lastStep.PathTile, Direction = MapSegmentDirection.Down
});
}
else
{
if (MapSegmentPathTile.IsFree(nextTile.NeighbourRight))
{
return(new MapSegmentTraverseResult {
PathTile = nextTile, Direction = lastStep.Direction
});
}
else
{
return(new MapSegmentTraverseResult {
PathTile = nextTile.NeighbourRight, Direction = MapSegmentDirection.Up
});
}
}
}
else if (lastStep.Direction == MapSegmentDirection.Down)
{
var nextTile = lastStep.PathTile.NeighbourLeft;
if (MapSegmentPathTile.IsFree(nextTile))
{
return(new MapSegmentTraverseResult {
PathTile = lastStep.PathTile, Direction = MapSegmentDirection.Left
});
}
else
{
if (MapSegmentPathTile.IsFree(nextTile.NeighbourDown))
{
return(new MapSegmentTraverseResult {
PathTile = nextTile, Direction = lastStep.Direction
});
}
else
{
return(new MapSegmentTraverseResult {
PathTile = nextTile.NeighbourDown, Direction = MapSegmentDirection.Right
});
}
}
}
else if (lastStep.Direction == MapSegmentDirection.Left)
{
var nextTile = lastStep.PathTile.NeighbourUp;
if (MapSegmentPathTile.IsFree(nextTile))
{
return(new MapSegmentTraverseResult {
PathTile = lastStep.PathTile, Direction = MapSegmentDirection.Up
});
}
else
{
if (MapSegmentPathTile.IsFree(nextTile.NeighbourLeft))
{
return(new MapSegmentTraverseResult {
PathTile = nextTile, Direction = lastStep.Direction
});
}
else
{
return(new MapSegmentTraverseResult {
PathTile = nextTile.NeighbourLeft, Direction = MapSegmentDirection.Down
});
}
}
}
// Theorically impossible but catches and handles errors
// TODO: Implement exceptions and exception handling for this kind of errors
return(null);
}
