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Major Bug!

edited September 2013 in Bugs Posts: 59

I did an if statement like this:

if playerYVel == 0 then

It says that playerYVel is 0, but it still won't activate the code. Please help!


  • dave1707dave1707 Mod
    Posts: 9,471

    We need more code to figure out what's happening. Nothing wrong with what you're showing so far.

  • It's too long, is there somewhere else I could put it?

  • dave1707dave1707 Mod
    edited September 2013 Posts: 9,471

    Can you just show some of the code before and after where you think you have a problem.

  • Here. playerYVel is a parameter which is set to a variable that controls the players Y velocity. It doesn't work with the plain variable yVel either by the way. What is happening is that when I click the jump button it doesn't jump, even though the parameter says 0. I've tested it and jump works without the if playerYVel == 0 condition. But this is so you can't jump in mid air.
    This is in the touch function.

            --Jump Button
           if touch.x > 95 and touch.x < 295 and CanMove == true and
            touch.y < 200 and touch.y > 100 and playerYVel == 0 then
                    yVel = 170
  • Posts: 2,820

    Can you replicate this bug in a separate project?

  • I'll see...

  • dave1707dave1707 Mod
    Posts: 9,471

    Are you saying that the 2 statements after "then" isn't being executed. If so, then put print statements before the "if" statement so you can see the values of all the variables in the "if" statement. That should help you determine what's happening.

  • edited September 2013 Posts: 59

    It's printing nil.
    But it's printing nil even when it's definatly not nil, like when the player is falling.

  • dave1707dave1707 Mod
    edited September 2013 Posts: 9,471

    If it's nil, then that's the problem. You have to determine why. Is the spelling of the variable correct. Is one letter capital in one place and not the other.

  • playerYVel

  • dave1707dave1707 Mod
    Posts: 9,471

    See my last post, I added stuff before your last response. One thing about programming, it does exactly what you write, not what you want.

  • now it prints -4. I made the if statement if yVel > 10 and yVel < 0. But it prints -4 and he still won't jump.

  • dave1707dave1707 Mod
    Posts: 9,471

    You have to look thru your code and determine why the value of yVel or playerYVel isn't what you think it is. Since your code is too big to show, you'll have to do that yourself. Try putting print statements where you have those variables and try to determine what's happening.

  • dave1707dave1707 Mod
    edited September 2013 Posts: 9,471

    The value of yVel can't be greater than 10 and less than 0 at the same time. That condition will always be false.

  • Posts: 1,255

    Check the CanMove variable. I'm suspicious since it has a leading cap here that it might not match elsewhere.

  • dave1707dave1707 Mod
    Posts: 9,471

    @Mark CanMove is correct because @EpicPotato said things worked when playerYVel was removed from the "if" statement.

  • IgnatzIgnatz Mod
    Posts: 5,396

    @EpicPotato - it looks very like an ordinary coding error.

    You've already found the value of playerYVel was negative when you thought it was zero, and now your replacement code is incorrect, as pointed out by @Mark.

    Please keep analysing the problem, until you know exactly what is happening. Otherwise, asking for help is just wasting everyone's time, especially when you refer to it as "Major Bug!". Please don't do that unless you are really, really sure, because you will probably embarrass yourself. Nearly every time, it is a user bug, not a bug in Codea.

  • Posts: 1,255

    I'd try something like this.

    if touch.x > 95 and touch.x < 295 then print("valid x") If canMove then print("can move") If touch.y < 200 and touch.y > 100 then print("valid y") if playerYVel == 0 then print("jumped") yVel = 170 updatePlayerVel() end end end end

    Just until you're sure of the failure point. Then you can remove the prints and merge the ifs.

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