有人能帮我实现双人跳跃吗？

Question

我知道已经有其他关于这个的帖子了，但是我的动作系统和我发现的有些不一样，所以随后我问这个问题。在

我的移动系统基于一个名为Move(up,left,right,down)的命名元组 然后是这样的：

def update(self, move, blocks):
    # check if we can jump 
    if move.up and self.on_ground:
        self.yvel -= self.jump_speed
    # simple left/right movement
    if move.left:
            self.xvel = -self.move_speed
    if move.right:
            self.xvel = self.move_speed

    # if in the air, fall down
    if not self.on_ground:
        self.yvel += 0.3
        # but not too fast
        if self.yvel > max_gravity: self.yvel = max_gravity

    # if no left/right movement, x speed is 0, of course
    if not (move.left or move.right):
        self.xvel = 0

    # move horizontal, and check for horizontal collisions
    self.rect.left += self.xvel
    self.collide(self.xvel, 0, blocks)

    # move vertically, and check for vertical collisions
    self.rect.top += self.yvel
    self.on_ground = False
    self.collide(0, self.yvel, blocks)

def collide(self, xvel, yvel, blocks):
    # all blocks that we collide with
    for block in [blocks[i] for i in self.rect.collidelistall(blocks)]:

        # if xvel is > 0, we know our right side bumped 
        # into the left side of a block etc.
        if xvel > 0:
                self.rect.right = block.rect.left;self.xvel=0
        if xvel < 0:
                self.rect.left = block.rect.right;self.xvel=0

        # if yvel > 0, we are falling, so if a collision happpens 
        # we know we hit the ground (remember, we seperated checking for
        # horizontal and vertical collision, so if yvel != 0, xvel is 0)
        if yvel > 0:
            self.rect.bottom = block.rect.top
            self.on_ground = True
            self.yvel = 0
        # if yvel < 0 and a collision occurs, we bumped our head
        # on a block above us
        if yvel < 0: self.rect.top = block.rect.bottom;self.yvel=0

我尝试向元组添加第五个变量upUp，当这个变量被调用时，它将触发另一个跳转，而不管{}是否为真。在

为了触发它，我在事件循环中使用了以下命令：

^{pr2}$

但这一点都不管用！ 有人有什么建议吗？在

Answer 1

你必须保持某种状态来记录你所处的跳跃“阶段”。在

这些“阶段”是：

• 在地面上
• 跳转（按下跳转按钮）
• 在半空中跳跃（松开跳跃按钮）
• 双跳（再次按下跳转按钮）

所以你应该能够做一些类似的事情：

def update(self, move, blocks):
    if self.on_ground:
        self.jump_state = 'on_ground'

    if move.up and self.on_ground:
        # jump!
        self.yvel -= self.jump_speed
        self.jump_state = 'jumped'

    if self.jump_state = 'jumped' and not move.up and not self.on_ground:
        self.jump_state = 'ready_for_double_jump'

    if self.jump_state = 'ready_for_double_jump' and move.up:
        # jump!
        self.yvel -= self.jump_speed
        self.jump_state = 'double_jumped'

    ...

你会明白的。在