grid type

public static const POINT_BLOCK:int = 0;//不可通过点
public static const POINT_SHELTER:int = 2;//遮挡点
public static const POINT_TRANSMISSION:int = 3; //传送点
public static const POINT_MONSTER:int = 4; //怪物
public static const POINT_EFFECT:int = 100; //特效
public static const POINT_BORN:int = 6; //出生点
public static const POINT_BORDER:int = 7; //边界
public static const POINT_NPC:int = 8; //npc
public static const POINT_BOSS_BOX:int = 9;