// random build a tile
void RandowmBuildTile()
{
List <GridIndexPair> emptyGridsIndexPairs = new List <GridIndexPair>();
for (int i = 0; i < maxRows; i++)
{
for (int j = 0; j < maxColumns; j++)
{
if (!gridState[i, j])
{
GridIndexPair pair;
pair.Row = i;
pair.Column = j;
emptyGridsIndexPairs.Add(pair);
}
}
}
if (emptyGridsIndexPairs.Count == 0)
{
return;
}
else
{
int r = Random.Range(0, emptyGridsIndexPairs.Count);
GridIndexPair indexPair = emptyGridsIndexPairs[r];
if (Random.Range(0.0f, 9.9f) > 8.0f)
{
gridState[indexPair.Row, indexPair.Column] = Instantiate(tiles[1], GetWorldPositionByGridIndex(indexPair), Quaternion.identity) as GameObject;
}
else
{
gridState[indexPair.Row, indexPair.Column] = Instantiate(tiles[0], GetWorldPositionByGridIndex(indexPair), Quaternion.identity) as GameObject;
}
}
}
// return position by grid index
Vector2 GetWorldPositionByGridIndex(GridIndexPair indexPair)
{
Vector2 worldPosition = Vector2.zero;
worldPosition.x = firstPosition.x + indexPair.Column * (tileWidth + borderWidth);
worldPosition.y = firstPosition.y - indexPair.Row * (tileWidth + borderWidth);
return(worldPosition);
}
// merge same tile
void MergeTwoSameTile(GameObject tileA, GameObject tileB, GridIndexPair oldIndexPair, GridIndexPair targetIndexPair)
{
GameObject go = Instantiate(tiles [tileA.GetComponent <Tiles> ().nextIndex],
GetWorldPositionByGridIndex(targetIndexPair),
Quaternion.identity) as GameObject;
Destroy(tileA.gameObject);
Destroy(tileB.gameObject);
gridState [targetIndexPair.Row, targetIndexPair.Column] = go;
gridState [oldIndexPair.Row, oldIndexPair.Column] = null;
// set current turn
go.GetComponent <Tiles> ().mergeInThisTurn = true;
// check if merge a tile with value 2048
if (go.GetComponent <Tiles>().value == 2048)
{
gameState = GameState.GameWin;
}
}
// move the tile to a new place
void MoveToNewPlace(GameObject tileA, GridIndexPair oldIndex, GridIndexPair newIndex)
{
tileA.transform.position = GetWorldPositionByGridIndex(newIndex);
gridState [newIndex.Row, newIndex.Column] = tileA;
gridState [oldIndex.Row, oldIndex.Column] = null;
}
// return position by grid index
Vector2 GetWorldPositionByGridIndex(GridIndexPair indexPair){
Vector2 worldPosition = Vector2.zero;
worldPosition.x = firstPosition.x + indexPair.Column * (tileWidth + borderWidth);
worldPosition.y = firstPosition.y - indexPair.Row * (tileWidth + borderWidth);
return worldPosition;
}
// move the tile to a new place
void MoveToNewPlace(GameObject tileA, GridIndexPair oldIndex, GridIndexPair newIndex){
tileA.transform.position = GetWorldPositionByGridIndex (newIndex);
gridState [newIndex.Row, newIndex.Column] = tileA;
gridState [oldIndex.Row, oldIndex.Column] = null;
}
// merge same tile
void MergeTwoSameTile(GameObject tileA, GameObject tileB,GridIndexPair oldIndexPair ,GridIndexPair targetIndexPair){
GameObject go = Instantiate (tiles [tileA.GetComponent<Tiles> ().nextIndex],
GetWorldPositionByGridIndex (targetIndexPair),
Quaternion.identity) as GameObject;
Destroy (tileA.gameObject);
Destroy (tileB.gameObject);
gridState [targetIndexPair.Row, targetIndexPair.Column] = go;
gridState [oldIndexPair.Row, oldIndexPair.Column] = null;
// set current turn
go.GetComponent<Tiles> ().mergeInThisTurn = true;
// check if merge a tile with value 2048
if(go.GetComponent<Tiles>().value == 2048)
gameState = GameState.GameWin;
}