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<title>src/pixi/text/BitmapText.js - Pixi.JS</title>
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<h1 class="file-heading">File: src/pixi/text/BitmapText.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* A Text Object will create a line(s) of text using bitmap font
* You can generate the fnt files using
* http://www.angelcode.com/products/bmfont/ for windows of
* http://www.bmglyph.com/ for mac.
* @class BitmapText
* @extends DisplayObjectContainer
* @constructor
* @param {String} text The copy that you would like the text to display
* @param {Object} [style] The style parameters
* @param {String} [style.font] default is "20pt Arial" The size and bitmap font id (must have loaded previously)
* @param {String} [style.align="left"] An alignment of the multiline text ("left", "center" or "right")
*/
//* @param {Object} [style.font="bold 20pt Arial"] The style and size of the font
PIXI.BitmapText = function(text, style)
{
PIXI.DisplayObjectContainer.call(this);
this.setText(text);
this.setStyle(style);
this.updateText();
this.dirty = false
};
// constructor
PIXI.BitmapText.constructor = PIXI.BitmapText;
PIXI.BitmapText.prototype = Object.create(PIXI.DisplayObjectContainer.prototype);
/**
* Set the copy for the text object
* @methos setText
* @param {String} text The copy that you would like the text to display
*/
PIXI.BitmapText.prototype.setText = function(text)
{
this.text = text || " ";
this.dirty = true;
};
/**
* Set the style of the text
* @method setStyle
* @param {Object} [style] The style parameters
* @param {Object} style.font The style and size of the font. If font size is not specified, it uses default bitmap font size. Font name is required
* @param {String} [style.align="left"] An alignment of the multiline text ("left", "center" or "right")
*/
PIXI.BitmapText.prototype.setStyle = function(style)
{
style = style || {};
style.align = style.align || "left";
this.style = style;
var font = style.font.split(" ");
this.fontName = font[font.length - 1];
this.fontSize = font.length >= 2 ? parseInt(font[font.length - 2], 10) : PIXI.BitmapText.fonts[this.fontName].size;
this.dirty = true;
};
/**
* Renders text
* @private
*/
PIXI.BitmapText.prototype.updateText = function()
{
var data = PIXI.BitmapText.fonts[this.fontName];
var pos = new PIXI.Point();
var prevCharCode = null;
var chars = [];
var maxLineWidth = 0;
var lineWidths = [];
var line = 0;
var scale = this.fontSize / data.size;
for(var i = 0; i < this.text.length; i++)
{
var charCode = this.text.charCodeAt(i);
if(charCode == "\n".charCodeAt(0))
{
lineWidths.push(pos.x);
maxLineWidth = Math.max(maxLineWidth, pos.x);
line++;
pos.x = 0;
pos.y += data.lineHeight;
prevCharCode = null;
continue;
}
var charData = data.chars[charCode];
if(!charData) continue;
if(prevCharCode && charData[prevCharCode])
{
pos.x += charData.kerning[prevCharCode];
}
chars.push({line: line, charCode: charCode, position: new PIXI.Point(pos.x + charData.xOffset, pos.y + charData.yOffset)});
pos.x += charData.xAdvance;
prevCharCode = charCode;
}
lineWidths.push(pos.x);
maxLineWidth = Math.max(maxLineWidth, pos.x);
var lineAlignOffsets = [];
for(i = 0; i <= line; i++)
{
var alignOffset = 0;
if(this.style.align == "right")
{
alignOffset = maxLineWidth - lineWidths[i];
}
else if(this.style.align == "center")
{
alignOffset = (maxLineWidth - lineWidths[i]) / 2;
}
lineAlignOffsets.push(alignOffset);
}
for(i = 0; i < chars.length; i++)
{
var char = PIXI.Sprite.fromFrame(chars[i].charCode);
char.position.x = (chars[i].position.x + lineAlignOffsets[chars[i].line]) * scale;
char.position.y = chars[i].position.y * scale;
char.scale.x = char.scale.y = scale;
this.addChild(char);
}
this.width = pos.x * scale;
this.height = (pos.y + data.lineHeight) * scale;
};
/**
* @private
*/
PIXI.BitmapText.prototype.updateTransform = function()
{
if(this.dirty)
{
while(this.children.length > 0)
{
this.removeChild(this.getChildAt(0));
}
this.updateText();
this.dirty = false;
}
PIXI.DisplayObjectContainer.prototype.updateTransform.call(this);
};
PIXI.BitmapText.fonts = {};
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