Adding variable to map object

[OKIComputer]

This is a pretty simple question, I'm trying to learn javascript/RPG Maker MV and how the core of RPGMaker MV's objects are layed out. I want to add a 2D array to the map objects for my game. This array will store whether the player has walked on a given tile or not: when the player walks on the tile, it becomes true. Real simple stuff. My question is, where should I declare that value? In what object?

 

[Zalerinian]

Well, first thing's first, unfortunately, JavaScript does not support multi-dimensional arrays. However, this is easy to fix, because technically, there's no such thing as a multi-dimensional array, and languages that appear to support it just do a little extra math behind the scenes to make it seem like it exists. The formula for the index in a two dimensional array (assuming we're using x for width and y for height) is:


var index = (y * height) + x;






Now that that's out of the way, where to put the variable depends on several things. What is going to need to access this array of walked-over tiles? What do you intend to use it for? Is it safe for any object with access to be able to change the array, or are there only a few spots that should be able to edit the values to ensure everything is valid?


Since you say you want to add it to the map, and I assume this may just be part of a learning exercise, or perhaps some kind of system you're working on to familiarize yourself with MV, we don't really need to go through a whole list of scenarios, because I'm assuming this is mostly designed as a learning experience. Personally, since your array will be based on the current map, I'd recommend putting it in Game_Map, which is re-setup (i.e. the setup function is called) for each map that's loaded. By putting the array in there, with the code to set it up, you're pretty much guaranteed that it'll apply to the current map.


If you haven't already seen it, I highly recommend that when you're developing plugins or changing the code for the engine to better fit your game, that you have the rpg_* files split up by class, as looking through the smaller files that are organized by name is significantly less intimidating than looking through five or six files of 10,000+ lines of code. I maintain a list of spit files for almost every version of RPG Maker MV (I think I missed 1.3.2 because it was short-lived or something) in this topic.

 

[Jonforum]

am not sure understand all , but if this, can help you a little bit.


// function check if on the title
$dataMap.titlecheck = function (tile,ppos){
if (ppos[0]===tile[0]&&ppos[1]===tile[1]) {
return true}return false
}


var ppos = [$gamePlayer._realX,$gamePlayer._realY]// Get the player pos in array
var titlepos = [[19,14],[10,15],[5,5]] // you title pos in 2D array
$dataMap.titlecheck(titlepos[0],ppos);// after call the function is your on the title you will get true or false , titlepos[0] to test the tite 1 titlepos[1] for the tite 2 ....


you can put this in console log and change titlepos, to understand how is work.
You will get true or false

 

[OKIComputer]

OK, thanks. That thread/resource looks very helpful as well, thank you. I'm trying to build up to a minimap system with a fog of war feature. So I want to be able to record where the player has been/seen. I've done a lot of editing of stuff and adding some functionality to already existing stuff for menus, mechanics etc., this is a bit more 'start from scratch' so I wanted to make sure I was starting in the right area.

 

[Zalerinian]

I see, alright. I assume you'd want to be able to store the information of what's been seen so it can be reloaded when you revisit a map, which could potentially add a bit of work to the plugin overall, depending on how you decide to store the information.