Geek Answers Handbook

Pygame: Can someone help me realize a double jump?

I know that there are other reports about this, but my system of movements is a little from the ones that I found, so later I ask this question.

My movement system is based on a named tuple called Move(up,left,right,down) Then there is the following:

 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

I tried to add a fifth variable to the tuple called upUp , and when it was called, it would cause another transition, regardless of whether the on_ground true or not.

To run it, I used this in an event loop:

 if e.type==KEYUP: if dj==0: dj=-1 if dj=-1: dj='true' Move(K_w,K_a,K_d,K_s,dj)

But that didn't work at all! Anyone have any suggestions?

+6
source share
1 answer

You must maintain some state in order to keep track of which phase you are jumping into.

These "phases" are:

  • on the ground
  • do jump (jump button pressed)
  • jumping and in the air (jump button pressed)
  • double jump (jump button is pressed again)

So you should be able to do something like:

 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' ...

You will get this idea.

+3
source

More articles:


All Articles