var core = require('../core');
/**
* 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:
*
* A BitmapText can only be created when the font is loaded
*
* ```js
* // in this case the font is in a file called 'desyrel.fnt'
* var bitmapText = new PIXI.BitmapText("text using a fancy font!", {font: "35px Desyrel", align: "right"});
* ```
*
*
* http://www.angelcode.com/products/bmfont/ for windows or
* http://www.bmglyph.com/ for mac.
*
* @class
* @extends Container
* @memberof PIXI.text
* @param text {string} The copy that you would like the text to display
* @param style {object} The style parameters
* @param style.font {string|object} The font descriptor for the object, can be passed as a string of form
* "24px FontName" or "FontName" or as an object with explicit name/size properties.
* @param [style.font.size] {number} The size of the font in pixels, e.g. 24
* @param [style.font.name] {string} The bitmap font id
* @param [style.align='left'] {string} Alignment for multiline text ('left', 'center' or 'right'), does not affect single line text
*/
function BitmapText(text, style)
{
core.Container.call(this);
/**
* The width of the overall text, different from fontSize,
* which is defined in the style object
*
* @member {number}
* @readOnly
*/
this.textWidth = 0;
/**
* The height of the overall text, different from fontSize,
* which is defined in the style object
*
* @member {number}
* @readOnly
*/
this.textHeight = 0;
/**
* Private tracker for the letter sprite pool.
*
* @member {Sprite[]}
* @private
*/
this._glyphs = [];
/**
* Private tracker for the current style.
*
* @member {object}
* @private
*/
this._style = {
tint: style.tint,
align: style.align,
fontName: null,
fontSize: 0
};
/**
* Private tracker for the current font.
*
* @member {object}
* @private
*/
this.font = style.font; // run font setter
/**
* Private tracker for the current text.
*
* @member {string}
* @private
*/
this._text = text;
/**
* The max width of this bitmap text in pixels. If the text provided is longer than the value provided, line breaks will be automatically inserted in the last whitespace.
* Disable by setting value to 0
*
* @member {number}
*/
this.maxWidth = 0;
/**
* The dirty state of this object.
*
* @member {boolean}
*/
this.dirty = false;
this.updateText();
}
// constructor
BitmapText.prototype = Object.create(core.Container.prototype);
BitmapText.prototype.constructor = BitmapText;
module.exports = BitmapText;
Object.defineProperties(BitmapText.prototype, {
/**
* The tint of the BitmapText object
*
* @member {number}
* @memberof BitmapText#
*/
tint: {
get: function ()
{
return this._style.tint;
},
set: function (value)
{
this._style.tint = (typeof value === 'number' && value >= 0) ? value : 0xFFFFFF;
this.dirty = true;
}
},
/**
* The alignment of the BitmapText object
*
* @member {string}
* @default 'left'
* @memberof BitmapText#
*/
align: {
get: function ()
{
return this._style.align;
},
set: function (value)
{
this._style.align = value;
this.dirty = true;
}
},
/**
* The font descriptor of the BitmapText object
*
* @member {Font}
* @memberof BitmapText#
*/
font: {
get: function ()
{
return this._style.font;
},
set: function (value)
{
if (typeof value === 'string') {
value = value.split(' ');
this._style.fontName = value.length === 1 ? value[0] : value.slice(1).join(' ');
this._style.fontSize = value.length >= 2 ? parseInt(value[0], 10) : BitmapText.fonts[this._style.fontName].size;
}
else {
this._style.fontName = value.name;
this._style.fontSize = typeof value.size === 'number' ? value.size : parseInt(value.size, 10);
}
this.dirty = true;
}
},
/**
* The text of the BitmapText object
*
* @member {string}
* @memberof BitmapText#
*/
text: {
get: function ()
{
return this._text;
},
set: function (value)
{
this._text = value;
this.dirty = true;
}
}
});
/**
* Renders text and updates it when needed
*
* @private
*/
BitmapText.prototype.updateText = function ()
{
var data = BitmapText.fonts[this._style.fontName];
var pos = new core.math.Point();
var prevCharCode = null;
var chars = [];
var lastLineWidth = 0;
var maxLineWidth = 0;
var lineWidths = [];
var line = 0;
var scale = this._style.fontSize / data.size;
var lastSpace = -1;
for (var i = 0; i < this.text.length; i++)
{
var charCode = this.text.charCodeAt(i);
lastSpace = /(\s)/.test(this.text.charAt(i)) ? i : lastSpace;
if (/(?:\r\n|\r|\n)/.test(this.text.charAt(i)))
{
lineWidths.push(lastLineWidth);
maxLineWidth = Math.max(maxLineWidth, lastLineWidth);
line++;
pos.x = 0;
pos.y += data.lineHeight;
prevCharCode = null;
continue;
}
if (lastSpace !== -1 && this.maxWidth > 0 && pos.x * scale > this.maxWidth)
{
chars.splice(lastSpace, i - lastSpace);
i = lastSpace;
lastSpace = -1;
lineWidths.push(lastLineWidth);
maxLineWidth = Math.max(maxLineWidth, lastLineWidth);
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 core.math.Point(pos.x + charData.xOffset, pos.y + charData.yOffset)});
lastLineWidth = pos.x + (charData.texture.width + charData.xOffset);
pos.x += charData.xAdvance;
prevCharCode = charCode;
}
lineWidths.push(lastLineWidth);
maxLineWidth = Math.max(maxLineWidth, lastLineWidth);
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 lenChars = chars.length;
var tint = this.tint;
for (i = 0; i < lenChars; i++)
{
var c = this._glyphs[i]; // get the next glyph sprite
if (c)
{
c.texture = chars[i].texture;
}
else
{
c = new core.Sprite(chars[i].texture);
this._glyphs.push(c);
}
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.
for (i = lenChars; i < this._glyphs.length; ++i)
{
this.removeChild(this._glyphs[i]);
}
this.textWidth = maxLineWidth * scale;
this.textHeight = (pos.y + data.lineHeight) * scale;
};
/**
* Updates the transform of this object
*
* @private
*/
BitmapText.prototype.updateTransform = function ()
{
if (this.dirty)
{
this.updateText();
this.dirty = false;
}
this.containerUpdateTransform();
};
BitmapText.fonts = {};
