on_event context

[white_haired_uncle]

You want to use on_event to create a preload event? I really don't think that will work, since on_event would need to be in preload. You'd be creating an event after it has already started, or just hoping your new one would be called once the current one is done. Even if it worked, I'm missing the point (though that happens a lot).

[hermestrismi]

You want to use on_event to create a preload event? I really don't think that will work, since on_event would need to be in preload. You'd be creating an event after it has already started, or just hoping your new one would be called once the current one is done. Even if it worked, I'm missing the point (though that happens a lot).

it is just a theoric approach. I was thinking that all I need is the table (potion_location) and the image file. so, I thought of two solutions: either create a wml variables (x,y,pot,image) and then a wml event (turn refresh ..) to check and redraw. or stick with lua and pass the table as a parameter or condition (if #potion_location ~= 0 then..) to a 'on_event preload'.
well, the second option is not possible from the wiki. preload events can't handle such lua code

[Ravana]

on_event has to run during preload, you can just do what you need instead of creating new preload event that will never be used.

[white_haired_uncle]

it is just a theoric approach. I was thinking that all I need is the table (potion_location) and the image file. so, I thought of two solutions: either create a wml variables (x,y,pot,image) and then a wml event (turn refresh ..) to check and redraw. or stick with lua and pass the table as a parameter or condition (if #potion_location ~= 0 then..) to a 'on_event preload'.
well, the second option is not possible from the wiki. preload events can't handle such lua code

I looked at the persistent_tags wiki entry and couldn't make much sense of it.

Personally, I would just use wml.array_access.get and wml.array_access.set to keep potion_location in sync with a WML array, and then create my events with
wesnoth.add_event_handler.

I suspect wml.array_access.get_proxy would be preferable to wml.array_access.get and wml.array_access.set, but I've never played with it.

[gnombat]

thank you for details. I should know that, really. I get much time to code it. I tried to use persistent tags but I m not familiar with and looks hard for me (I need much time of try and lose).
is there any exemple (commented for steps and details) that can help other than the one in the wiki?

There appears to be a working example of persistent tags in the tutorial campaign.

[hermestrismi]

thank you for details. I should know that, really. I get much time to code it. I tried to use persistent tags but I m not familiar with and looks hard for me (I need much time of try and lose).
is there any exemple (commented for steps and details) that can help other than the one in the wiki?

There appears to be a working example of persistent tags in the tutorial campaign.

thank you. I am surprised that it is easier than I thought with this tutorial I should not have prejudices

[Celtic_Minstrel]

is there any exemple (commented for steps and details) that can help other than the one in the wiki?

There are some examples in core, I believe

and what if I on_event to create a preload_event just like the move to one?

I think there's mostly no point in doing that. It probably works if you put it in a global Lua tag, but at that point, what's the difference from just putting your code there without using an event? There may be some cases where that's useful, but this isn't one of them.