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<title>src/pixi/loaders/BitmapFontLoader.js - Pixi.JS</title>
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<h1 class="file-heading">File: src/pixi/loaders/BitmapFontLoader.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* The xml loader is used to load in XML bitmap font data ("xml" or "fnt")
* To generate the data you can use http://www.angelcode.com/products/bmfont/
* This loader will also load the image file as the data.
* When loaded this class will dispatch a "loaded" event
* @class BitmapFontLoader
* @extends EventTarget
* @constructor
* @param {String} url the url of the sprite sheet JSON file
* @param {Boolean} crossorigin
*/
PIXI.BitmapFontLoader = function(url, crossorigin)
{
/*
* i use texture packer to load the assets..
* http://www.codeandweb.com/texturepacker
* make sure to set the format as "JSON"
*/
PIXI.EventTarget.call(this);
this.url = url;
this.baseUrl = url.replace(/[^\/]*$/, "");
this.texture = null;
this.crossorigin = crossorigin;
};
// constructor
PIXI.BitmapFontLoader.constructor = PIXI.BitmapFontLoader;
/**
* This will begin loading the JSON file
*/
PIXI.BitmapFontLoader.prototype.load = function()
{
this.ajaxRequest = new XMLHttpRequest();
var scope = this;
this.ajaxRequest.onreadystatechange = function()
{
scope.onXMLLoaded();
};
this.ajaxRequest.open("GET", this.url, true);
if (this.ajaxRequest.overrideMimeType) this.ajaxRequest.overrideMimeType("application/xml");
this.ajaxRequest.send(null)
};
/**
* Invoked when XML file is loaded
* @private
*/
PIXI.BitmapFontLoader.prototype.onXMLLoaded = function()
{
if (this.ajaxRequest.readyState == 4)
{
if (this.ajaxRequest.status == 200 || window.location.href.indexOf("http") == -1)
{
var textureUrl = this.baseUrl + this.ajaxRequest.responseXML.getElementsByTagName("page")[0].attributes.getNamedItem("file").nodeValue;
var image = new PIXI.ImageLoader(textureUrl, this.crossorigin);
this.texture = image.texture.baseTexture;
var data = {};
var info = this.ajaxRequest.responseXML.getElementsByTagName("info")[0];
var common = this.ajaxRequest.responseXML.getElementsByTagName("common")[0];
data.font = info.attributes.getNamedItem("face").nodeValue;
data.size = parseInt(info.attributes.getNamedItem("size").nodeValue, 10);
data.lineHeight = parseInt(common.attributes.getNamedItem("lineHeight").nodeValue, 10);
data.chars = {};
//parse letters
var letters = this.ajaxRequest.responseXML.getElementsByTagName("char");
for (var i = 0; i < letters.length; i++)
{
var charCode = parseInt(letters[i].attributes.getNamedItem("id").nodeValue, 10);
var textureRect = {
x: parseInt(letters[i].attributes.getNamedItem("x").nodeValue, 10),
y: parseInt(letters[i].attributes.getNamedItem("y").nodeValue, 10),
width: parseInt(letters[i].attributes.getNamedItem("width").nodeValue, 10),
height: parseInt(letters[i].attributes.getNamedItem("height").nodeValue, 10)
};
PIXI.TextureCache[charCode] = new PIXI.Texture(this.texture, textureRect);
data.chars[charCode] = {
xOffset: parseInt(letters[i].attributes.getNamedItem("xoffset").nodeValue, 10),
yOffset: parseInt(letters[i].attributes.getNamedItem("yoffset").nodeValue, 10),
xAdvance: parseInt(letters[i].attributes.getNamedItem("xadvance").nodeValue, 10),
kerning: {},
texture:new PIXI.Texture(this.texture, textureRect)
};
}
//parse kernings
var kernings = this.ajaxRequest.responseXML.getElementsByTagName("kerning");
for (i = 0; i < kernings.length; i++)
{
var first = parseInt(kernings[i].attributes.getNamedItem("first").nodeValue, 10);
var second = parseInt(kernings[i].attributes.getNamedItem("second").nodeValue, 10);
var amount = parseInt(kernings[i].attributes.getNamedItem("amount").nodeValue, 10);
data.chars[second].kerning[first] = amount;
}
PIXI.BitmapText.fonts[data.font] = data;
var scope = this;
image.addEventListener("loaded", function() {
scope.onLoaded();
});
image.load();
}
}
};
/**
* Invoked when all files are loaded (xml/fnt and texture)
* @private
*/
PIXI.BitmapFontLoader.prototype.onLoaded = function()
{
this.dispatchEvent({type: "loaded", content: this});
};
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