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Collision #298414 11/14/09 21:14 11/14/09 21:14
Joined: Mar 2009 Posts: 186 V Valdsator OP Member
Valdsator OP Member V Joined: Mar 2009 Posts: 186	I'm trying to get an entity to explode when the player spaceship touches it. Problem is, I have no idea how I would do a if(hit) { do stuff } I looked at the f1 help, and I know it has something to do with c_trace, but I'm still confused. Could someone just write an example that basically shows, if this entity is hit by this entity, do something. I'll make sure not to copy and paste. Or maybe there's some tutorial lying around that I didn't see. Thanks in advance.

Re: Collision [Re: Valdsator] #298622 11/16/09 14:39 11/16/09 14:39
Joined: Aug 2007 Posts: 1,922 Schweiz Widi Serious User
Widi Serious User Joined: Aug 2007 Posts: 1,922 Schweiz	Use events for that. my.emask = ENABLE_ENTITY \| ENABLE_BLOCK; my.event = explode_function;

Re: Collision [Re: Widi] #299572 11/25/09 00:27 11/25/09 00:27
Joined: Mar 2009 Posts: 186 V Valdsator OP Member
Valdsator OP Member V Joined: Mar 2009 Posts: 186	Uhh, I don't really understand. Can someone please give me an example in code of something touching something else and a function being activated? Are there things you must set up before being able to do this sort of collision, or what? Thanks.

Re: Collision [Re: Valdsator] #299858
11/27/09 17:58 11/27/09 17:58

Joined: Nov 2009
Posts: 34

Sepiantum

Newbie

Sepiantum

Newbie

Joined: Nov 2009
Posts: 34

This is probably the crudest collision engine that I ever wrote, but it should work. I would advise anybody experienced with coding to check over my work.

Code:

//have SHIPWIDTH,  SHIPHEIGHT, ENEMYWIDTH, and ENEMYHEIGHT defined somewhere
int index;
for(index = 0;index < NUM_ENEMIES;index++){
    //check if ship is able to be checked for collsion along the y axis
    if(ship.y + SHIPHEIGHT/2 < enemy[index].y - ENEMYHEIGHT/2 &&
       ship.y - SHIPHEIGHT/2 > enemy[index].y + ENEMYHEIGHT/2){
        if(ship.x + SHIPWIDTH/2 > enemy[index].x - ENEMYWIDTH/2){
            ship.x = enemy[index].x - ENEMYWIDTH/2 - SHIPWIDTH/2;
        }
        else if(ship.x - SHIPWIDTH/2 < enemy[index].x + ENEMYWIDTH/2){
            ship.x = enemy[index].x + ENEMYWIDTH/2 + SHIPWIDTH/2;
        }
    }
    //check if ship is able to be checked for collision along the x axis
    if(ship.x + SHIPWIDTH/2 > enemy[index].x - ENEMYWIDTH/2 &&
       ship.x - SHIPWIDTH/2 < enemy[index].x + ENEMYWIDTH/2){
        if(ship.y - SHIPHEIGHT/2 < enemy[index].y + ENEMYWIDTH/2){
            ship.y = enemy[index].y + ENEMYHEIGHT/2 + SHIPHEIGHT/2;
        }
        else if(ship.y + SHIPHEIGHT/2 > enemy[index].y - ENEMYHEIGHT/2){
            ship.y = enemy[index].y - ENEMYHEIGHT/2 - SHIPHEIGHT/2;
        }
    }
}

What this basically does is stop your ship from going through your enemy. Well, that is what I think it does. Play around with the code.

Last edited by Sepiantum; 11/27/09 17:58.

Re: Collision [Re: Sepiantum] #299861 11/27/09 18:04 11/27/09 18:04
Joined: May 2008 Posts: 2,113 NRW/Germany alibaba Expert
alibaba Expert Joined: May 2008 Posts: 2,113 NRW/Germany	@Sepiantum WOW! But thats not helpful for a beginner. @valdsator you must make something liek this: if you use lite-c: my.emask\|=ENALE_IMPACT; //React if touched my.event=nameoffunction; //Do this, if collided Professional Edition A8.47.1 -------------------- http://www.yueklet.de

Re: Collision [Re: alibaba] #299869 11/27/09 19:12 11/27/09 19:12
Joined: Nov 2009 Posts: 34 S Sepiantum Newbie
Sepiantum Newbie S Joined: Nov 2009 Posts: 34	LOL. I am a beginner. I just have good imagination. So visualizing stuff is easy for me.

Re: Collision [Re: Sepiantum] #299880 11/27/09 20:51 11/27/09 20:51
Joined: May 2008 Posts: 2,113 NRW/Germany alibaba Expert
alibaba Expert Joined: May 2008 Posts: 2,113 NRW/Germany	Anyway really good code for a beginner Professional Edition A8.47.1 -------------------- http://www.yueklet.de

Re: Collision [Re: alibaba] #300755 12/04/09 21:39 12/04/09 21:39
Joined: Mar 2009 Posts: 186 V Valdsator OP Member
Valdsator OP Member V Joined: Mar 2009 Posts: 186	Edit:Think I've figured it out... Last edited by Valdsator; 12/04/09 21:46.

Re: Collision [Re: Valdsator] #300757 12/04/09 21:46 12/04/09 21:46
Joined: May 2008 Posts: 2,113 NRW/Germany alibaba Expert
alibaba Expert Joined: May 2008 Posts: 2,113 NRW/Germany	its right like you use it, but you forget the " \| ". i must be like this: my.emask \|= ENABLE_IMPACT; my.event = collide; Professional Edition A8.47.1 -------------------- http://www.yueklet.de

Re: Collision [Re: alibaba] #300758 12/04/09 21:56 12/04/09 21:56
Joined: Mar 2009 Posts: 186 V Valdsator OP Member
Valdsator OP Member V Joined: Mar 2009 Posts: 186	Actually, it was just an error in my naming of the entities. But I've got it now, and I discovered that I need to use c_move so the entity can actually react. Why it was turning back to 0 tilt was actually because the naming of the entity was before it told it to go to tilt 90, so once it crashed, it didn't continue with the action. Thanks, now I can finally continue my game! Edit:One more question, how would I make it that only specific entities may activate the function? Because I don't want my ship to be getting hit by it's own bullets and such. Last edited by Valdsator; 12/04/09 21:57.

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