slope detection - easy way « Borne Games Forum

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slope detection - easy way

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Started 1 year ago by Shadow Gamer1
Latest reply from kstyle

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Shadow Gamer1
Member
Post Count: 67

well, after seeing the amount of math used in the codes posted here, i figured i was never gonna be able to figure it out, but i specialize in making stuff easier then it really is. so i figured this, what if i used thee same type of code used in a frame slider to make sure the two circles needed to rotate the character are the right distance away, and rotate at the same time and stuff, ill work on the code ill need, but it would help if someone that had experience with this type of stuff could help, such as making the line in between rotate as the two circles do. this is just a suggestion, but it could sure help a lot of people if it worked, and make it a whole lot easier than learning trig.

EDIT: k, ive got the circle slider thing ready, here ill show you
http://www.newgrounds.com/dump/item/62558dcd6321bb0e52ab54b46f28c14f
now, all i need to do is make two circles, and make sure theyre always the same distance apart, ive got a couple ideas, but im not sure if theyll work.

im the cross between Shadow the Hedgehog and an xbox 360

Posted 1 year ago #
Nyubis
Nyubis of Strata
Post Count: 9089

This (normally) uses the same code as the circle slider. If you make the 2 balls in there invisible and replace the line in the top-right corner with your character, tie the balls' _x position to the character, then you basically have slope detection.

But it'd still be quite buggy, and I'm not gonna bother with it.

Here's the source.

Not in cruelty
Not in wrath
the Reaper came today.

An angel visited
this gray path
And took the cube away.

Posted 1 year ago #
Shadow Gamer1
Member
Post Count: 67

well, ive been trying to get it so that the second circles position is rotated as the first one, but i cant get it. oh and the fla file you posted doesnt work for flash 8, so could you please post the code, also i dont think this kind of code will work, (the one i posted) but ill try to find a nice and easy way to do it.

im the cross between Shadow the Hedgehog and an xbox 360

Posted 1 year ago #
Nyubis
Nyubis of Strata
Post Count: 9089

No problem, here's the Flash 8 version.

Not in cruelty
Not in wrath
the Reaper came today.

An angel visited
this gray path
And took the cube away.

Posted 1 year ago #
Shadow Gamer1
Member
Post Count: 67

k, well i got the slope detection, above 90 degrees should work fine too, i just need to make it so that the "player" reads it as solid ground like it does for the rest, i should have an example out tomorrow, cause the vcam code is making flash run slow (ill work that out too)

im the cross between Shadow the Hedgehog and an xbox 360

Posted 1 year ago #
Shadow Gamer1
Member
Post Count: 67

k, heres the slope detection swf as promised http://www.truploader.com/view/809009
also, i need some help with implementing gravity with this code, since i chose to make the code using _y to point out the rotation, my usual code doesnt work. if anyone could help me with that, id credit you when the game comes out.
heres the fla file http://www.truploader.com/view/926419 (works with flash 8 )
(also, just so you know, i made it so that you cant go off the edge, just so no one gets annoyed by the fact that you fall off into oblivion) (doesnt work above 90)

im the cross between Shadow the Hedgehog and an xbox 360

Posted 1 year ago #
Shadow Gamer1
Member
Post Count: 67

well... im totally stumped with the gravity... i had a few things in mind but they didnt work... if someone could help me out with this id really appreciate it

im the cross between Shadow the Hedgehog and an xbox 360

Posted 1 year ago #
Nyubis
Nyubis of Strata
Post Count: 9089

Well you could just remove the dots when you jump, and respawn them at the player's feet when he lands. You don't need slope detection while in the air anyway.

Not in cruelty
Not in wrath
the Reaper came today.

An angel visited
this gray path
And took the cube away.

Posted 1 year ago #
WJUK
The Lone Ranger
Post Count: 13301

But would you then completely stop rotation and default back to completely vertical?

That would look weird when jumping and landing (on slanted ground).

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Posted 1 year ago #
VideoGuy
Spielberg
Post Count: 8720

I would say just hold the rotation while you jump (I mean make it so it doesn't change midair) and then restart the rotation when you land.

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Posted 1 year ago #
Nyubis
Nyubis of Strata
Post Count: 9089

Yeah, that's what I meant.

Not in cruelty
Not in wrath
the Reaper came today.

An angel visited
this gray path
And took the cube away.

Posted 1 year ago #
WJUK
The Lone Ranger
Post Count: 13301

I suppose so, but it might look a bit weird to jump off areas that are slanted when you're jumping directly up.

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Posted 1 year ago #
Shadow Gamer1
Member
Post Count: 67

its ironic, i got the supposedly hard part down (slope detection) an i cant get something easy like gravtity and jumping

im the cross between Shadow the Hedgehog and an xbox 360

Posted 1 year ago #
WJUK
The Lone Ranger
Post Count: 13301

How about do the jumping with trig?

Since you know the position (coordinates) of the two points you use for slope detection, surely you can just detect the angle they make and apply the correct x and y coefficients to generate thrust for jumping.

If you apply the x,y thrust over time, you can also simulate gravity by letting the y thrust peter out until it's 0 then start going negative (obviously you should also apply a terminal velocity, otherwise you'll shoot through platforms). Then stop apply y thrust immediately when you detect a hit with a platform.

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Posted 1 year ago #
kstyle
Member
Post Count: 15

I'm not sure exactly what you're doing, but it doesn't seem like your slope detection method works quite right. The character jitters a lot, and whenever you go up a steep slope, the character moves really fast to the other end. I glanced at your code and you are running 6 while loops a frame, which is kind of ridiculous. The simplest way to achieve what you're trying to do would probably be the way I think most people on this forum do it: simply treat each of the two points separately, applying movement and gravity to each, then use a single while loop each to bring them out of the ground, then bind them together by moving each of them so that they are always the same distance apart (which will prevent your character from suddenly moving really fast). Calculate rotation as you are right now, then average the points to find where to draw your player.

here is an implementation similar to what I'm talking about. https://www.mochimedia.com/community/forum/topic/slope-detection

Posted 1 year ago #
Shadow Gamer1
Member
Post Count: 67

oh, yeah i guess youre right. 6 whiles is probably what gave me so many problems. but could you give me an example of this (in fla format, if possible for flash 8 please) i sorta get what youre talking about, but im having trouble with keeping them the same distance apart, what do you do for that? sorry if this seems annoying or anything, i just really want to get this part done so i can move onto the other parts of the game.

im the cross between Shadow the Hedgehog and an xbox 360

Posted 1 year ago #
kstyle
Member
Post Count: 15

I don't have a working .fla because I do it a completely different way that's much more math intensive, but if you look around the link I posted you'll find a working .fla and some code, which should work with your setup with little extra work. He actually does it sort of in reverse order to what I told you, colliding the character clip first, then adjusting the two points on either side of the character. This eliminates the need for a specific distance set up.

But, it's always good to know how to do it. So I'll explain the concept and you can apply it yourself in code.

First thing you need to do is apply the distance formula between the two points (character's "feet" ) and determine how far apart they actually are. Sqrt((x2-x1)^2+(y2-y1)^2) where (x1,y1) is the first pt, and (x2,y2)is the second pt. Subtract how far they are supposed to be from this number, then move each point by half of the extra distance.

Posted 1 year ago #
Shadow Gamer1
Member
Post Count: 67

well, i tried out the code in the link, and its really not that good... i got it to jump and do gravity with the code i got originally, and i got it so that there arent as many "whiles" so i think ill stick with that code. but now, im probably gonna work on making it so that it only rotates when its on the ground, but ill do that tommorow or so... right now, i did my coding for the day, at this rate i should have it done right before 2012, that way people will get to play it right before they die

im the cross between Shadow the Hedgehog and an xbox 360

Posted 1 year ago #
Shadow Gamer1
Member
Post Count: 67

hey, i found out a really easy way to jump in a certain direction.
http://www.newgrounds.com/dump/item/555d11c27a7212ea55d6809f8c4ff514
i still need to fix going up really fast for steep hills (also for the example, dont go off the edge, it screws flash up, just warning you) but for now, its pretty good. especially considering this is the first game im ever making with flash. oh and thanks for anybody who gave any input or helped in any way.

im the cross between Shadow the Hedgehog and an xbox 360

Posted 1 year ago #
WJUK
The Lone Ranger
Post Count: 13301

Sounds like you've got it figured out. Probably not quite as smooth as doing it the traditional way, but it's probably easier.

Also, you should fix the crash when you move to the extreme edges.

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Posted 1 year ago #

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