private void Start()
{
tangram = GameObject.Find("Tangram").GetComponent <Tangram>();
placerect = GameObject.Find("placeRect");
chessBoard = GameObject.Find("chessboard");
StartCoroutine("waitaframe");
}
void OnMouseDown()
{
GetComponent <MeshRenderer>().GetComponent <Renderer>().material.color = Color.white;
//init game
Tangram tg = GameObject.Find("Tangram").GetComponent <Tangram>();
tg.onlyClear();
//set difficulty and level
GameData.difficulty = 0;
GameData.instance.cLevel = Random.Range(0, GameData.totalLevel[GameData.difficulty]);
//start game;
tg.initSingleMode();
}