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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 BitmapText object will create a line or multiple lines of text using bitmap font. To split a line you can use '\n', '\r' or '\r\n' in your string.
* You can generate the fnt files using
* http://www.angelcode.com/products/bmfont/ for windows or
* http://www.bmglyph.com/ for mac.
*
* @class BitmapText
* @extends DisplayObjectContainer
* @constructor
* @param text {String} The copy that you would like the text to display
* @param style {Object} The style parameters
* @param style.font {String} The size (optional) and bitmap font id (required) eq 'Arial' or '20px Arial' (must have loaded previously)
* @param [style.align='left'] {String} Alignment for multiline text ('left', 'center' or 'right'), does not affect single line text
*/
PIXI.BitmapText = function(text, style)
{
PIXI.DisplayObjectContainer.call(this);
/**
* [read-only] The width of the overall text, different from fontSize,
* which is defined in the style object
*
* @property textWidth
* @type Number
* @readOnly
*/
this.textWidth = 0;
/**
* [read-only] The height of the overall text, different from fontSize,
* which is defined in the style object
*
* @property textHeight
* @type Number
* @readOnly
*/
this.textHeight = 0;
/**
* @property _pool
* @type Array
* @private
*/
this._pool = [];
this.setText(text);
this.setStyle(style);
this.updateText();
/**
* The dirty state of this object.
* @property dirty
* @type Boolean
*/
this.dirty = false;
};
// constructor
PIXI.BitmapText.prototype = Object.create(PIXI.DisplayObjectContainer.prototype);
PIXI.BitmapText.prototype.constructor = PIXI.BitmapText;
/**
* Set the text string to be rendered.
*
* @method setText
* @param text {String} The text that you would like displayed
*/
PIXI.BitmapText.prototype.setText = function(text)
{
this.text = text || ' ';
this.dirty = true;
};
/**
* Set the style of the text
* style.font {String} The size (optional) and bitmap font id (required) eq 'Arial' or '20px Arial' (must have loaded previously)
* [style.align='left'] {String} Alignment for multiline text ('left', 'center' or 'right'), does not affect single lines of text
*
* @method setStyle
* @param style {Object} The style parameters, contained as properties of an object
*/
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;
this.tint = style.tint;
};
/**
* Renders text and updates it when needed
*
* @method updateText
* @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(/(?:\r\n|\r|\n)/.test(this.text.charAt(i)))
{
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.kerning[prevCharCode])
{
pos.x += charData.kerning[prevCharCode];
}
chars.push({texture:charData.texture, 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);
}
var lenChildren = this.children.length;
var lenChars = chars.length;
var tint = this.tint || 0xFFFFFF;
for(i = 0; i < lenChars; i++)
{
var c = i < lenChildren ? this.children[i] : this._pool.pop(); // get old child if have. if not - take from pool.
if (c) c.setTexture(chars[i].texture); // check if got one before.
else c = new PIXI.Sprite(chars[i].texture); // if no create new one.
c.position.x = (chars[i].position.x + lineAlignOffsets[chars[i].line]) * scale;
c.position.y = chars[i].position.y * scale;
c.scale.x = c.scale.y = scale;
c.tint = tint;
if (!c.parent) this.addChild(c);
}
// remove unnecessary children.
// and put their into the pool.
while(this.children.length > lenChars)
{
var child = this.getChildAt(this.children.length - 1);
this._pool.push(child);
this.removeChild(child);
}
this.textWidth = maxLineWidth * scale;
this.textHeight = (pos.y + data.lineHeight) * scale;
};
/**
* Updates the transform of this object
*
* @method updateTransform
* @private
*/
PIXI.BitmapText.prototype.updateTransform = function()
{
if(this.dirty)
{
this.updateText();
this.dirty = false;
}
PIXI.DisplayObjectContainer.prototype.updateTransform.call(this);
};
PIXI.BitmapText.fonts = {};
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