loading levels

Monkey Targets Forums/HTML5/loading levels

Yoda	(Posted 2011) [#1]

Is there any way I can load files during runtime, in order to load level-data for a game?

I don't want to include all the level-data in strings in the code.

skape

(Posted 2011) [#2]

EDIT: Oops, just realized that this was in the HTML5 section--part of what I wrote still applies. Various additional HTML5 methods have been discussed.

Hi, check out the os module, particularly LoadString() for the basics. You can also take a look at warpy's JSON example in the "bananas" folder (for one, there are other examples out there), for some ideas, or the Monkey Code section of this form, which has various useful classes...

impixi

(Posted 2011) [#3]

You could write a TextFile class in JavaScript that utilizes XMLHttpRequest. Something like this (UNTESTED):

textfile.js

function TextFile() {}

TextFile.prototype.loaded = false;
TextFile.prototype.lines = null;

TextFile.prototype.Load = function (url)
{
	this.loaded = false;
	this.lines = null;

	var txtFile = new XMLHttpRequest();

	txtFile.open("GET", url, true);
	
	txtFile.onreadystatechange = function() 
	{
		if (txtFile.readyState === XMLHttpRequest.DONE) 
		{  
			if (txtFile.status === 200) 
			{ 
				TextFile.prototype.lines = txtFile.responseText.split("\n");
				TextFile.prototype.loaded = true;
			}
			else
			{
				alert(url + " could not be found or access is denied.");
			}
		}
	}
	
	txtFile.send(null);
};

TextFile.prototype.GetLine = function (num)
{
	if (num < this.lines.length)
		return this.lines[num];
};

TextFile.prototype.GetMaxLines = function (num)
{
	return this.lines.length;
};

And the monkey code that hooks into it might be something like this (UNTESTED):

Strict

Import mojo.app
Import "textfile.js"

Extern

Class TextFile

	Field loaded:Int
	
	Method Load:Void(url:String)
	Method GetLine:String(num:Int)
	Method GetMaxLines:Int()

End

Public


Function Main:Int()

	New TestApp()
		
	Return 0
End



Class TestApp Extends App


	Field levelData:TextFile
	Field levelProcessed:Int


	Method OnCreate:Int()
	
		levelData = New TextFile()
		levelProcessed = False
		
		levelData.Load("http://www.mydomain.com/mygame/level01.txt")
		
		SetUpdateRate 60
		
		Return 0
	End
	
	
	Method Update:Int()
	
		If levelData.loaded And (Not levelProcessed)
			
			For Local i:Int = 0 Until levelData.GetMaxLines()
				Print levelData.GetLine(i)
			Next
			
			levelProcessed = True
			
		Endif
	
		Return 0
	End


	Method OnRender:Int()
	
	
		Return 0
	End


End

This won't run locally (due to browser security checks).