Collision Detection Glitch

Programming Questions

TheGamers..

in Programming Questions • 2 years ago

Hey, I found this example of simple collision detection: Simple Collision and really liked it and decided to borrow it and mold it to my needs and to also jump into inheritance. Most of the time it works extraordinary but every once-in-awhile it goes haywire and decides to detect a random collision although your character isn't even close to the ellipse/square. So, basically, my question is there a more efficient way of doing simple collision detection or a way to fix this? I think this might be part of the problem, that the glitch tends to only happen on my Mac, V.10.5.8 along with a problem with my robot script... I don't really want to post the code, so it would be helpful if you could answer with just knowledge or I could provide more detail.

Thanks greatly,

TheGamersHaven

P.S. It doesn't really happen when I am on my windows 7 so... that gives me more proof that the problem is more on the mac end of it.

Replies(4)

deceaseds..

Re: Collision Detection Glitch

2 years ago

I usually write it this way, using

PVector loc=coordinates

PVector Size=object height/width

this=target object,

with this script inside the class object doing the test:

if(abs(this.loc.x-loc.x)<Size.x && abs(this.loc.y-loc.y)<Size.y)){

}

I have never had any problems with it, although i don't have a mac....

It just seems like simpler code.

TheGamers..

Re: Re: Collision Detection Glitch

2 years ago

Thanks for the reply! Uhm... I'm having a hard time understanding what you mean... I don't really know exactly where to put your suggested code. Could you explain more please?

Thanks again,

TheGamersHaven

P.S. Nice game! I really like all the graphics and how smooth it runs.

deceaseds..

Re: Collision Detection Glitch

2 years ago

Okay, if you had an enemy object, checking for player's bullets:

Class Enemy{

PVector loc;

PVector Size;

PImage graphic;

Enemy(float xx, float yy, PImage graphik){

loc=new PVector(xx, yy, 0);

graphic=new PImage(graphik);

Size=new PVector(graphik.width/2, graphik.height/2, 0); //grab object size from graphic

}

void Check(){

for(int i=0; i<Shots.length; i++) //sort through array of player's shots

{

Shot thisone=Shots[i];

if(abs(thisone.loc.x-loc.x)<Size.x && abs(thisone.loc.y-loc.y)<Size.y){

//shot has collided, or is close enough to do pixel test if needed//

}

}//end function Check

}//end class Enemy

PS. Shot cast to 'thisone' because we may do lots more stuff with the shot once it has collided with us....depending on the enemy state/attributes. We can make an explosion from it, or deflect it, but in most cases, we will destroy it and take it's damage, of course you can use Shots[i] to refer to it, but that's something you can do once you've completed your script - thisone is much easier to type during long hours of experimental work.

TheGamers..

Re: Re: Collision Detection Glitch

2 years ago

Alright, thanks for further explanation, I really appreciate your time and hope to implement that as soon as possible! The Shot thing with different variations such as explosion and stuff sounds awesome and I definitely want to implement something like that, anything that will give it more appeal.

Thanks again for the help,

TheGamersHaven

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