Player jumping with bump.lua

[drikdrok]

So i am working on a small project with a basic player jumping around on a map.
I am following "RazorGameDev"'s tutorial on youtube. But instead of using all the code he made, i tried implementing other libraries i know better. I now use Bump.lua for collision, and the hump camera as the camera. Works fine. Except that my player can jump repeatedly up against a wall. Here's my code:

Code: Select all

	self.x, self.y, collisions = world:move(self, self.x + self.xvel, self.y + self.yvel)
	if keyDown("space") and self.canJump then 
  		self.canJump = false
  		self.yvel = -15.5
	elseif #collisions >= 1 and self.yvel > 0 then 
		self.canJump = true 
	end	

I am aware that the reason he jumps is that nothing in the code prevents him from jumping. But how would I? My best bet would be to find out which side of the player was colliding. This way i see could if the player is on the ground, or has the side to a wall. It would look somthing like:

Code: Select all

	if self.bottom.isColliding then 
  		self.yvel = -15.5
	end

But i have no idea how to achieve this...

[tuupakku]

I have no experience with bump.lua, but by printing the character yvel to the console I noticed that it's never 0, even when the character is perfectly still. It would probably be easier if your character had an yvel of 0 when still so you could use yvel == 0 as a condition to allow jumping... unless that's not how bump.lua works.

[s-ol]

If the collision normal is {0,-1} the collision was at the bottom (nx=0, ny==-1).

[drikdrok]

If the collision normal is {0,-1} the collision was at the bottom (nx=0, ny==-1).

Thank you very much! Now I got it to Work just fine !