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<h1 class="file-heading">File: src/pixi/text/Text.js</h1>
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<pre class="code prettyprint linenums">
/**
* @author Mat Groves http://matgroves.com/ @Doormat23
* - Modified by Tom Slezakowski http://www.tomslezakowski.com @TomSlezakowski (24/03/2014) - Added dropShadowColor.
*/
/**
* A Text Object will create a line(s) of text. To split a line you can use '\n'
* or add a wordWrap property set to true and and wordWrapWidth property with a value
* in the style object
*
* @class Text
* @extends Sprite
* @constructor
* @param text {String} The copy that you would like the text to display
* @param [style] {Object} The style parameters
* @param [style.font] {String} default 'bold 20px Arial' The style and size of the font
* @param [style.fill='black'] {String|Number} A canvas fillstyle that will be used on the text e.g 'red', '#00FF00'
* @param [style.align='left'] {String} Alignment for multiline text ('left', 'center' or 'right'), does not affect single line text
* @param [style.stroke] {String|Number} A canvas fillstyle that will be used on the text stroke e.g 'blue', '#FCFF00'
* @param [style.strokeThickness=0] {Number} A number that represents the thickness of the stroke. Default is 0 (no stroke)
* @param [style.wordWrap=false] {Boolean} Indicates if word wrap should be used
* @param [style.wordWrapWidth=100] {Number} The width at which text will wrap, it needs wordWrap to be set to true
* @param [style.dropShadow=false] {Boolean} Set a drop shadow for the text
* @param [style.dropShadowColor='#000000'] {String} A fill style to be used on the dropshadow e.g 'red', '#00FF00'
* @param [style.dropShadowAngle=Math.PI/4] {Number} Set a angle of the drop shadow
* @param [style.dropShadowDistance=5] {Number} Set a distance of the drop shadow
*/
PIXI.Text = function(text, style)
{
/**
* The canvas element that everything is drawn to
*
* @property canvas
* @type HTMLCanvasElement
*/
this.canvas = document.createElement('canvas');
/**
* The canvas 2d context that everything is drawn with
* @property context
* @type HTMLCanvasElement 2d Context
*/
this.context = this.canvas.getContext('2d');
PIXI.Sprite.call(this, PIXI.Texture.fromCanvas(this.canvas));
this.setText(text);
this.setStyle(style);
this.updateText();
this.dirty = false;
};
// constructor
PIXI.Text.prototype = Object.create(PIXI.Sprite.prototype);
PIXI.Text.prototype.constructor = PIXI.Text;
/**
* Set the style of the text
*
* @method setStyle
* @param [style] {Object} The style parameters
* @param [style.font='bold 20pt Arial'] {String} The style and size of the font
* @param [style.fill='black'] {Object} A canvas fillstyle that will be used on the text eg 'red', '#00FF00'
* @param [style.align='left'] {String} Alignment for multiline text ('left', 'center' or 'right'), does not affect single line text
* @param [style.stroke='black'] {String} A canvas fillstyle that will be used on the text stroke eg 'blue', '#FCFF00'
* @param [style.strokeThickness=0] {Number} A number that represents the thickness of the stroke. Default is 0 (no stroke)
* @param [style.wordWrap=false] {Boolean} Indicates if word wrap should be used
* @param [style.wordWrapWidth=100] {Number} The width at which text will wrap
* @param [style.dropShadow=false] {Boolean} Set a drop shadow for the text
* @param [style.dropShadowColor='#000000'] {String} A fill style to be used on the dropshadow e.g 'red', '#00FF00'
* @param [style.dropShadowAngle=Math.PI/4] {Number} Set a angle of the drop shadow
* @param [style.dropShadowDistance=5] {Number} Set a distance of the drop shadow
*/
PIXI.Text.prototype.setStyle = function(style)
{
style = style || {};
style.font = style.font || 'bold 20pt Arial';
style.fill = style.fill || 'black';
style.align = style.align || 'left';
style.stroke = style.stroke || 'black'; //provide a default, see: https://github.com/GoodBoyDigital/pixi.js/issues/136
style.strokeThickness = style.strokeThickness || 0;
style.wordWrap = style.wordWrap || false;
style.wordWrapWidth = style.wordWrapWidth || 100;
style.wordWrapWidth = style.wordWrapWidth || 100;
style.dropShadow = style.dropShadow || false;
style.dropShadowAngle = style.dropShadowAngle || Math.PI / 6;
style.dropShadowDistance = style.dropShadowDistance || 4;
style.dropShadowColor = style.dropShadowColor || 'black';
this.style = style;
this.dirty = true;
};
/**
* Set the copy for the text object. To split a line you can use '\n'
*
* @method setText
* @param {String} text The copy that you would like the text to display
*/
PIXI.Text.prototype.setText = function(text)
{
this.text = text.toString() || ' ';
this.dirty = true;
};
/**
* Renders text and updates it when needed
*
* @method updateText
* @private
*/
PIXI.Text.prototype.updateText = function()
{
this.context.font = this.style.font;
var outputText = this.text;
// word wrap
// preserve original text
if(this.style.wordWrap)outputText = this.wordWrap(this.text);
//split text into lines
var lines = outputText.split(/(?:\r\n|\r|\n)/);
//calculate text width
var lineWidths = [];
var maxLineWidth = 0;
for (var i = 0; i < lines.length; i++)
{
var lineWidth = this.context.measureText(lines[i]).width;
lineWidths[i] = lineWidth;
maxLineWidth = Math.max(maxLineWidth, lineWidth);
}
var width = maxLineWidth + this.style.strokeThickness;
if(this.style.dropShadow)width += this.style.dropShadowDistance;
this.canvas.width = width + this.context.lineWidth;
//calculate text height
var lineHeight = this.determineFontHeight('font: ' + this.style.font + ';') + this.style.strokeThickness;
var height = lineHeight * lines.length;
if(this.style.dropShadow)height += this.style.dropShadowDistance;
this.canvas.height = height;
if(navigator.isCocoonJS) this.context.clearRect(0,0,this.canvas.width,this.canvas.height);
this.context.font = this.style.font;
this.context.strokeStyle = this.style.stroke;
this.context.lineWidth = this.style.strokeThickness;
this.context.textBaseline = 'top';
var linePositionX;
var linePositionY;
if(this.style.dropShadow)
{
this.context.fillStyle = this.style.dropShadowColor;
var xShadowOffset = Math.sin(this.style.dropShadowAngle) * this.style.dropShadowDistance;
var yShadowOffset = Math.cos(this.style.dropShadowAngle) * this.style.dropShadowDistance;
for (i = 0; i < lines.length; i++)
{
linePositionX = this.style.strokeThickness / 2;
linePositionY = this.style.strokeThickness / 2 + i * lineHeight;
if(this.style.align === 'right')
{
linePositionX += maxLineWidth - lineWidths[i];
}
else if(this.style.align === 'center')
{
linePositionX += (maxLineWidth - lineWidths[i]) / 2;
}
if(this.style.fill)
{
this.context.fillText(lines[i], linePositionX + xShadowOffset, linePositionY + yShadowOffset);
}
// if(dropShadow)
}
}
//set canvas text styles
this.context.fillStyle = this.style.fill;
//draw lines line by line
for (i = 0; i < lines.length; i++)
{
linePositionX = this.style.strokeThickness / 2;
linePositionY = this.style.strokeThickness / 2 + i * lineHeight;
if(this.style.align === 'right')
{
linePositionX += maxLineWidth - lineWidths[i];
}
else if(this.style.align === 'center')
{
linePositionX += (maxLineWidth - lineWidths[i]) / 2;
}
if(this.style.stroke && this.style.strokeThickness)
{
this.context.strokeText(lines[i], linePositionX, linePositionY);
}
if(this.style.fill)
{
this.context.fillText(lines[i], linePositionX, linePositionY);
}
// if(dropShadow)
}
this.updateTexture();
};
/**
* Updates texture size based on canvas size
*
* @method updateTexture
* @private
*/
PIXI.Text.prototype.updateTexture = function()
{
this.texture.baseTexture.width = this.canvas.width;
this.texture.baseTexture.height = this.canvas.height;
this.texture.crop.width = this.texture.frame.width = this.canvas.width;
this.texture.crop.height = this.texture.frame.height = this.canvas.height;
this._width = this.canvas.width;
this._height = this.canvas.height;
this.requiresUpdate = true;
};
/**
* Renders the object using the WebGL renderer
*
* @method _renderWebGL
* @param renderSession {RenderSession}
* @private
*/
PIXI.Text.prototype._renderWebGL = function(renderSession)
{
if(this.requiresUpdate)
{
this.requiresUpdate = false;
PIXI.updateWebGLTexture(this.texture.baseTexture, renderSession.gl);
}
PIXI.Sprite.prototype._renderWebGL.call(this, renderSession);
};
/**
* Updates the transform of this object
*
* @method updateTransform
* @private
*/
PIXI.Text.prototype.updateTransform = function()
{
if(this.dirty)
{
this.updateText();
this.dirty = false;
}
PIXI.Sprite.prototype.updateTransform.call(this);
};
/*
* http://stackoverflow.com/users/34441/ellisbben
* great solution to the problem!
* returns the height of the given font
*
* @method determineFontHeight
* @param fontStyle {Object}
* @private
*/
PIXI.Text.prototype.determineFontHeight = function(fontStyle)
{
// build a little reference dictionary so if the font style has been used return a
// cached version...
var result = PIXI.Text.heightCache[fontStyle];
if(!result)
{
var body = document.getElementsByTagName('body')[0];
var dummy = document.createElement('div');
var dummyText = document.createTextNode('M');
dummy.appendChild(dummyText);
dummy.setAttribute('style', fontStyle + ';position:absolute;top:0;left:0');
body.appendChild(dummy);
result = dummy.offsetHeight;
PIXI.Text.heightCache[fontStyle] = result;
body.removeChild(dummy);
}
return result;
};
/**
* Applies newlines to a string to have it optimally fit into the horizontal
* bounds set by the Text object's wordWrapWidth property.
*
* @method wordWrap
* @param text {String}
* @private
*/
PIXI.Text.prototype.wordWrap = function(text)
{
// Greedy wrapping algorithm that will wrap words as the line grows longer
// than its horizontal bounds.
var result = '';
var lines = text.split('\n');
for (var i = 0; i < lines.length; i++)
{
var spaceLeft = this.style.wordWrapWidth;
var words = lines[i].split(' ');
for (var j = 0; j < words.length; j++)
{
var wordWidth = this.context.measureText(words[j]).width;
var wordWidthWithSpace = wordWidth + this.context.measureText(' ').width;
if(j === 0 || wordWidthWithSpace > spaceLeft)
{
// Skip printing the newline if it's the first word of the line that is
// greater than the word wrap width.
if(j > 0)
{
result += '\n';
}
result += words[j];
spaceLeft = this.style.wordWrapWidth - wordWidth;
}
else
{
spaceLeft -= wordWidthWithSpace;
result += ' ' + words[j];
}
}
if (i < lines.length-1)
{
result += '\n';
}
}
return result;
};
/**
* Destroys this text object
*
* @method destroy
* @param destroyBaseTexture {Boolean} whether to destroy the base texture as well
*/
PIXI.Text.prototype.destroy = function(destroyBaseTexture)
{
// make sure to reset the the context and canvas.. dont want this hanging around in memory!
this.context = null;
this.canvas = null;
this.texture.destroy(destroyBaseTexture === undefined ? true : destroyBaseTexture);
};
PIXI.Text.heightCache = {};
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