jump problems

[kikito]

This, this is what causes most of the bugs, in my collision code I used this for everything. Bad times..
But since your just using this for static objects I think it's fine, but how can two static objects collide, Probably only if the coder coded two static objects on top of each other by mistake, right ?

Not necessarily. There are scenarios where static objects must be spawned on top of others. For example, explosions. They are created suddently and they affect a more or less great area - potentially overlapping with existing objects. But yes, it could happen that a coder moves an object around (with world:move) without checking for collisions first (with world:check), or resolving the collisions poorly.

Interesting approach, I actually use this algorithm in my geometry lib to check intersection points between a line and rectangles. I never thought about using it to resolve collisions.

The idea is not mine. I took it from Collision Detection for Dummies. I just decided that I didn't want to use lots of vectors, so I stuck with AABBs instead of polygons.

I use [wiki]love.physics.newEdgeShape[/wiki] and then I attach all EdgeShapes to a single static body, thank you Omar for telling me how this is done

I don't like having to use edge shapes. They look like a cop-out . But whatever works for everyone. Your gif looks cool

[Ranguna259]

Not necessarily. There are scenarios where static objects must be spawned on top of others. For example, explosions. They are created suddently and they affect a more or less great area - potentially overlapping with existing objects. But yes, it could happen that a coder moves an object around (with world:move) without checking for collisions first (with world:check), or resolving the collisions poorly.

Oh yeah, sudden creation of static objects, didn't thought of that.

The idea is not mine. I took it from Collision Detection for Dummies. I just decided that I didn't want to use lots of vectors, so I stuck with AABBs instead of polygons.

Interesting article, not that I'm thinking on rebooting my physics project but still, it's knowledge and knowladge is good

I don't like having to use edge shapes. They look like a cop-out . But whatever works for everyone. Your gif looks cool

Well, they work so it's fine with me
Thank you, soon to be in Projects and Demos section.

[micha]

@elsalvador: let's get back to your initial question. So far, your approach is fine. All you have to do, is fix your internal logic a little bit.

So, this is the line of code, that does the jumping:

Code: Select all

if not (l.direction == "jump") and k("j") then  l.yvel = jumpv ; l.direction= "jump" end

What it does is, it checks if the direction is not "jump" and if the key is pressed. The reason, why you get the flying-effect when going left or right, is that if you press left or right then l.direction is set to "left" or "right" and it is not "jump" anymore. So let's forget about the l.direction variable. The does not tell us enough about the player's state. So, first remove this line and then add these ones:

Code: Select all

-- in the initialization:
l.canJump = true

-- in the update:
if l.y >= floor - l.h then
  l.y= floor - l.h
  l.yvel= 0
  l.canJump = true
end

-- in the keypressed:
function p:keypressed(key)
  if key == 'j' and l.canJump then
    l.yvel = jumpv
    l.canJump = false
  end
end

[elsalvador]

okay so what you say is that not everything have to go under love.update???if i press key it will make the jump??? an not ruin my i.direction??
let me give it a try and let see if it works i kind of confuse with the update i see map collisions under keypressed wonder how will i do it with update if i want smooth movement and not block by block so the update in this as well makes me think... and thanks for the help if any problems ill get back again

[micha]

The only thing that you should put into the keypressed-event is the start of the jump, because the start of the jump happens only in one moment in time. Of course, the rest of the jump, namely moving through the air, is handled in the update-event.

[elsalvador]

Thanks for the help i just learned a little bit about jump action but here is the problem after doing what you guys told me i found that
the directions of the games are not accurate and here can become a bug in future for my project i tried my best but i cant understand how to use keypressed and released for direction?
here its the update and i am sure I did something wrong..because my directions are not 100% and i am planning to use them for more stuff

i still want to show its jumping while its actually jumping and show stand while stand and walking both direction but how to use the pressed and released ????its tricky for sure..

for sure the only way to learn its to ask and ask the pro-programmers like you guys

[murks]

Thanks a lot Micha for your jump explanation, I guess it would have taken me ages to implement this without some guidance. I implemented 'Mario style' jumping now, it still needs a lot of tweaking but it works!