Windows Need help with lists

[TheBlindG]

Hello!

I am not sure how lists work fully and hope some1 can help me. I have few actors which can be available for targeting by the enemy. If the player target is a valid target, I was tihking of adding all valid targets to a list, and i.e check which of those targets has the currently lowest HP and attack that target. Is this possible with lists? And if so, any examples would be helpful!

Thanks in advance

 

[Yal]

Definitely. There's also a function called ds_list_shuffle() that shuffles a list... if you want to select a random thing from a list, shuffle it and take the first or last item in it. Perfect for enemy AI and random drops and things like that.

 

[jo-thijs]

So, you have a list that contains a bunch of instance ids and you want to get the id with the lowest hp from it?
That's certainly possible:

var result = noone;

for(var i = ds_list_size(list) - 1; i >= 0; i--)
    if result == noone || list[|i].hp < result.hp
        result = list[|i];

At the end of this code, result will contain the instance with the lowest hp.

 

[bojack29]

A priority would really work best here.
You can add values to a priority to find, in your case, the lowest hp target and the priority would be sorted automatically.

p = ds_priority_create();
with(obj_targets){
     ds_priority_add(other.p, id, hp);
}
myTarget = ds_priority_find_min(p);
ds_priority_destroy(p);

 

[TheBlindG]

Thanks a bunch for the good comments! You guys helped a lot!

 

[TheBlindG]

Is this correct use of list?

var targets = ds_list_create();

for(ii = 1; ii <= 5; ii++){
  if(spot[ii].actor != noone){
  if(spot[ii].actor.valid_target){
  ds_list_add(targets, spot[ii].actor);
  }
  }
}

ds_list_shuffle(targets);

var target = ds_list_find_index(targets, 0)

 

[FrostyCat]

The last line certainly isn't, and you'd know why if you read the Manual entry on it.

Use the accessor syntax or ds_list_find_value() instead.

 

[TheBlindG]

Thanks!