/// <summary>
/// 做加速运动
/// <para>bullet 敌机子弹</para>
/// <para>float acce 加速度</para>
/// <para>float angle 速度方向 or bool useVAngle使用速度方向</para>
/// <para>bool isAimToPlayer 是否朝向玩家</para>
/// </summary>
/// <param name="luaState"></param>
/// <returns></returns>
public static int EnemyBulletDoAcceleration(ILuaState luaState)
{
EnemyBulletBase bullet = luaState.ToUserData(-4) as EnemyBulletBase;
float acce = (float)luaState.ToNumber(-3);
float angle;
if (luaState.Type(-2) == LuaType.LUA_TBOOLEAN)
{
bullet.GetBulletPara(BulletParaType.VAngel, out angle);
}
else
{
angle = (float)luaState.ToNumber(-2);
}
bool isAimToPlayer = luaState.ToBoolean(-1);
luaState.Pop(4);
if (isAimToPlayer)
{
Vector2 playerPos = PlayerInterface.GetInstance().GetCharacter().GetPosition();
angle += MathUtil.GetAngleBetweenXAxis(playerPos - bullet.GetPosition());
}
bullet.DoAcceleration(acce, angle);
return(0);
}