// ------------------------------------------------------------------------------------------------------------
#region update/ input
protected void Update()
{
if (Input.GetMouseButtonDown(0) && GUIUtility.hotControl == 0 && unitMoving == false)
{
// Check what the player clicked on. I've set Tiles to be on Layer 8 and Unit on Layer 9.
// Each tile has its own collider attached but I could have used a big invisible collider
// that stretches the whole map as a catch all for clicks that did not fall on a unit.
// The only reason the tiles each have a collider is because they are used in other
// samples too that requires it.
RaycastHit hit;
Ray r = Camera.main.ScreenPointToRay(Input.mousePosition);
if (Physics.Raycast(r, out hit, Mathf.Infinity, clickMask))
{
if (hit.transform.gameObject.layer == 8)
{
// a tile was clicked
Sample4Tile n = map.NodeAtWorldPosition <Sample4Tile>(hit.point);
//Sample4Tile n = (Sample4Tile)map.NodeAtWorldPosition(hit.point);
if (n != null)
{
Debug.Log("Clicked on: " + n.tileName);
// check if a tile that the active unit may move to
if (activeUnit != null && validMoveNodes.Contains(n))
{
// get the path
List <MapNavNode> path = map.Path <MapNavNode>(activeUnit.tile, n, OnNodeCostCallback);
if (path != null)
{
unitMoving = true; // need to wait while unit is moving
ClearMoveMarkers();
activeUnit.Move(path, OnUnitMoveComplete);
}
}
}
}
else
{
// a unit was clicked. first clear the previously selected unit
if (activeUnit != null)
{
activeUnit.UnitDeSelected();
ClearMoveMarkers();
}
activeUnit = hit.transform.GetComponent <Sample4Unit>();
if (activeUnit != null)
{
// tell the unit it was selected so that it can change colour
activeUnit.UnitSelected();
// show the player the area that the unit may move to
UpdateMoveMarkers();
}
}
}
}
}
/// <summary>
/// I override this callback so that I can respond on the grid being
/// changed and place/ update the actual tile objects
/// </summary>
public override void OnGridChanged(bool created)
{
// The parent object that will hold all the instantiated tile objects
Transform parent = gameObject.transform;
// Remove existing tiles and place new ones if map was (re)created
// since the number of tiles might be different now
if (created)
{
for (int i = parent.childCount - 1; i >= 0; i--)
{
// was called from editor
Object.DestroyImmediate(parent.GetChild(i).gameObject);
}
// Place tiles according to the generated grid
for (int idx = 0; idx < grid.Length; idx++)
{
// make sure it is a valid node before placing tile here
if (false == grid[idx].isValid)
{
continue;
}
// create the visual tile
GameObject go = (GameObject)Instantiate(tileFab);
go.name = "Tile " + idx.ToString();
go.layer = tileLayer; // set the layer since I will need it in Sample4Controller to check what the player clicked on
go.transform.position = grid[idx].position;
go.transform.parent = parent;
// MapNav created the node as the custom Sample4Tile type
// Now init the tileName property in it
Sample4Tile node = grid[idx] as Sample4Tile;
node.tileName = go.name;
node.tileObj = go;
}
}
// else, simply update the position of existing tiles
else
{
for (int idx = 0; idx < grid.Length; idx++)
{
// make sure it is a valid node before processing it
if (false == grid[idx].isValid)
{
continue;
}
// Since I gave the tiles proper names I can easily find them by name
GameObject go = parent.Find("Tile " + idx.ToString()).gameObject;
go.transform.position = grid[idx].position;
}
}
}
protected bool unitMoving = false; // set when a unit is moving and no input should be accepted
#endregion
// ------------------------------------------------------------------------------------------------------------
#region start
protected void Start()
{
// get reference to the mapnav map
map = GameObject.Find("Map").GetComponent <Sample4Map>();
// also used in sample4b
if (map == null)
{
map = GameObject.Find("Map").GetComponent <Sample4bMap>();
}
// in this sample I will simply spawn 10 units on random locations of the map
for (int i = 0; i < 10; i++)
{
Sample4Tile selectedTile = null;
// find a tile to place the unit on. I will randomly select one.
// but I need to check if there is not already a unit on the
// selected tile before accepting it.
while (true)
{
int idx = Random.Range(0, map.grid.Length);
// make sure this is a valid node
if (map.ValidIDX(idx))
{
// now check if there is not already a unit on it
selectedTile = map.grid[idx] as Sample4Tile;
if (selectedTile.unit == null)
{
// no unit on it, lets use it
break;
}
}
}
// create the unit and place it on the tile
GameObject go = (GameObject)Instantiate(unitFab);
go.transform.position = selectedTile.position;
go.layer = 9; // in this sample Units must be in layer 9
// be sure to tell the tile that this Unit is on it
Sample4Unit unit = go.GetComponent <Sample4Unit>();
unit.Resetunit(); // reset its moves now too
unit.LinkWithTile(selectedTile);
units.Add(unit); // keep a list of all units for quick access
}
}
/// <summary>
/// I use this to link the tile and unit with each other so that the
/// tile and unit knows which unit is on the tile. I will pass null
/// to simply unlink the tile and unit.
/// </summary>
public void LinkWithTile(Sample4Tile t)
{
// first unlink the unit from the tile
if (tile != null)
{
tile.unit = null;
}
tile = t;
// if t == null then this was simply an unlink and it ends here
if (tile == null)
{
return;
}
// else tell the tile that this unit is on it
tile.unit = this;
}
private bool CheckIfValidNode(MapNavNode toNode)
{
Sample4Tile n = toNode as Sample4Tile;
// this will help prevent a border being drawn around the active unit's tile
// also see the IF(neighbours[j] != activeUnit.tile ...) that must be used above
if (n == activeUnit.tile)
{
return(true);
}
// can't move to a tile that has a unit on it
if (n.unit != null)
{
return(false);
}
// finally, return tile's default state
return(toNode.isValid);
}
