Graal Forums - NPC collision

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- - NPC collision (https://forums.graalonline.com/forums/showthread.php?t=134264359)

You can make an NPC that has a function for onPlayerTouchsMe() and so on will happen.

But can you make a NPC have the same thing happen for an onPlayerTouchsMe().

An NPC touching another NPC.
I'm using for a baddie.

Currently no. You'll need to write your own collision detection. I don't think it would be very feasible getting an event added for NPC touching NPC

Quote:

Originally Posted by blackbeltben (Post 1665328)

After moving the NPC, you can do something such as:

PHP Code:


		
			
function doTouchTrigger(){

  temp.pixel = 1 / 16;

  temp.halfpixel = 1 / 32;

  if(this.dir % 2 == 1){

    temp.x = this.x + 0.75 - temp.halfpixel + (vecx(this.dir) * (0.75 + temp.halfpixel));

    temp.y = this.y + 1;

    temp.w = 1 + temp.pixel;

    temp.h = 2;

  }

  else{

    temp.x = this.x + 0.5;

    temp.y = this.y + 1.25 - temp.halfpixel + (vecy(this.dir) * (0.75 + temp.halfpixel));

    temp.w = 2;

    temp.h = 1 + temp.pixel;

  }

  

  temp.tnpcs = findareanpcs(temp.x, temp.y, temp.w, temp.h);

  //I'm not sure if findareanpcs(); filters out npcs which call the function

  temp.tnpcs.remove(this);

  for(temp.n : temp.tnpcs){

    temp.n.trigger("NPCTouchsMe", this);

  }

}



//Will result in

function onNPCTouchsMe(temp.n){

  this.chat = "I was touched by the NPC at " @ temp.n.x @ ", " @ temp.n.y;

}

These coordinates are based on showcharacter npcs.

Could always place a constant firing triggeraction in front of the npc:

PHP Code:


		
			
triggeraction( playerx.+1.5+(vecx(player.dir)), player.y+2+(vecy(player.dir)), "npctouchedme", NULL);

Then in the receiving npc just find out when the triggeraction is called and your rolling. Im only suggesting this because Thors method is a bit daunting for some people. So unless you understand what his done theres always a second more easier to understand approach. Its just a bit less stable lol.

It might not be the most elegant solution but it sure is straight forward ;)

Quote:

Originally Posted by Tricxta (Post 1665473)

Could always place a constant firing triggeraction in front of the npc:

PHP Code:


		
			
triggeraction( playerx.+1.5+(vecx(player.dir)), player.y+2+(vecy(player.dir)), "npctouchedme", NULL);

Not only is it not elegant but running triggeraction loops is horribly inefficient and taxing on the server.

NPCs, if given a shape(via setshape() or showcharacter()) are considered walls via onwall(). Instead, he could check for walls and only when they collide with a wall, check for an NPC in front of them... if you want to do something simple. However, this requires NPCs to block which may not be desired, and will end up emulating almost exactly what Thor is doing anyways... he could fall back on triggeraction when it hits a wall but I don't like to recommend triggeraction.

Quote:

Originally Posted by DustyPorViva (Post 1665478)

Good point... I had in mind it only being used a cheats way to make things work with the average npc character though, but yes... I was wrong to suggest such a horrid solution :(