Question

我有一个要求，我必须拍摄图像并将其渲染到隐藏的画布。然后读取其图像数据，然后使用动画慢慢渲染到另一个画布。

我做到了：

def main():
    session = orm.sessionmaker(bind=engine)
    db = session()
    Base.metadata.create_all(engine)

    p1 = Obj()
    db.add(p1)
    db.flush()

    p2 = Obj()
    p2.deleted = True

    p1.children.append(p2)
    db.flush()

    # prints <Obj id=1 children=1>
    # This means the object is in the `children` collection, even though
    # it is deleted. If you want to prevent this you may want to use
    # custom collection classes (not for novices!).
    print p1

    # We let SQLalchemy forget everything and fetch the state from the DB.
    db.expire_all()

    p3 = db.query(Obj).first()

    # prints <Obj id=1 children=0>
    # This indicates that the children which is still linked is not
    # loaded into the relationship, which is what we wanted.
    print p3

    db.rollback()


if __name__ == '__main__':
    main()

以上代码有效，但它以奇怪的方式缓慢渲染图像。我也知道我在for循环中犯了一个错误，有人能帮我找到我做错的地方吗？

如何从html5 Canvas中的另一个arrayBuffer正确分配ArrayBuffer

0 个答案: