changing hitbox size

[Winston]

okay for my platformer game I am trying to make a character be able to slide under an object. When down and X are pressed the character changes into a sliding animation where the hitbox is supposed to be half as high and the character slides forwards. The problem is I can't figure out a way to do this without the hitbox giving a weird error that sort of forces the character ever frame somewhat into the ground or something

[Jaffob]

Sounds like a hotspot problem!

[Winston]

here's the mmf http://www.megaupload.com/?d=7WE2TYZF

[wizkidweb]

lol u mean mfa

[Winston]

yupp that's what I mean

[Docilemouse]

What you could do is use a seperate object for hit detection, and resize that object accordingly.

[Winston]

What you could do is use a seperate object for hit detection, and resize that object accordingly.

I think that's what I did, could you check my mfa to see what I did wrong?

[Docilemouse]

Hmmm... This is very weird. Unfortunately, i'm not very familiar with the platform extension you're using, so i'm pretty much at a loss...

...Okay. After messing around with it for a while I think I've sort of figured out the issue. When the hit detection switches to the Sliding hit detection object, the ground collisions go screwy for some reason. I don't know why.

If this were my game, Instead of making a whole other object for hit detection when sliding, I would just add another animation or frame to the standing hit detector, and switch the animation when the player is sliding.

-Animation of player "Sliding" is playing
->change animation of hit detector to "Sliding detection"

Of course, the detector's sliding animation should be shorter.

Hope this helps, and good luck on the game. What you have so far is fun already. =)

[Winston]

thanks a bunch man
unfortunatly when I try doing that I get another weird error (the code is all under "basic" at the top) could you try to get this working and upload an example or something? this isn't making sense to me at all
heres my attempt
http://www.megaupload.com/?d=B5YY9DAY

[TreeHugger]

Okay,

adjusted file

the problem is a combination of the collision box's sliding animation frame and the change to sliding code.
The collision box's slide animation frame is bigger than the stopped frame (the whole frame not just the actual coloured parts). With the hotspot of both at <0,0>, this means that when the player changes to sliding, since the slide frame is bigger, the bottom of the collision box is no longer at ground level but slightly below it.

I've experimented a couple of different fixes, changing sizes of the different frames and then adjusting some of the positioning code and the easiest way I found to fix it, was to change the height of the 'stopped' animation and to crop the width of the 'slide' animation.
* I've increased it's height (added transparent pixels above it) making it the same height as the sliding frame and the players animation frames.
* changed event 5 so that the positioning is <-5,0> instead of <-5,4>
* changed event 9 so that positioning is <-7,0> instead of whatever it was before
* changed event 10 so that positioning is <-2,0> instead of whatever it was before

Note: I haven't changed the positioning in event 8 for the left and right wall detectors. You may need to adjust them.
Note2: I didn't read through every event in your code so you may need to make the odd adjustment but that will only be where something is positioned in reference to the collision box and will usually just mean reducing the Y position by approx 4 or 5 pixels

Er, I think that's it