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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
*/
/**
* A Text Object will create a line(s) of text to split a line you can use "\n"
* @class Text
* @extends Sprite
* @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 "bold 20pt Arial" The style and size of the font
* @param {Object} [style.fill="black"] A canvas fillstyle that will be used on the text eg "red", "#00FF00"
* @param {String} [style.align="left"] An alignment of the multiline text ("left", "center" or "right")
* @param {String} [style.stroke] A canvas fillstyle that will be used on the text stroke eg "blue", "#FCFF00"
* @param {Number} [style.strokeThickness=0] A number that represents the thickness of the stroke. Default is 0 (no stroke)
* @param {Boolean} [style.wordWrap=false] Indicates if word wrap should be used
* @param {Number} [style.wordWrapWidth=100] The width at which text will wrap
*/
PIXI.Text = function(text, style)
{
this.canvas = document.createElement("canvas");
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.constructor = PIXI.Text;
PIXI.Text.prototype = Object.create(PIXI.Sprite.prototype);
/**
* Set the style of the text
* @method setStyle
* @param {Object} [style] The style parameters
* @param {String} [style.font="bold 20pt Arial"] The style and size of the font
* @param {Object} [style.fill="black"] A canvas fillstyle that will be used on the text eg "red", "#00FF00"
* @param {String} [style.align="left"] An alignment of the multiline text ("left", "center" or "right")
* @param {String} [style.stroke="black"] A canvas fillstyle that will be used on the text stroke eg "blue", "#FCFF00"
* @param {Number} [style.strokeThickness=0] A number that represents the thickness of the stroke. Default is 0 (no stroke)
* @param {Boolean} [style.wordWrap=false] Indicates if word wrap should be used
* @param {Number} [style.wordWrapWidth=100] The width at which text will wrap
*/
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;
this.style = style;
this.dirty = true;
};
/**
* Set the copy for the text object. To split a line you can use "\n"
* @methos setText
* @param {String} text The copy that you would like the text to display
*/
PIXI.Sprite.prototype.setText = function(text)
{
this.text = text.toString() || " ";
this.dirty = true;
};
/**
* Renders text
* @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);
}
this.canvas.width = maxLineWidth + this.style.strokeThickness;
//calculate text height
var lineHeight = this.determineFontHeight("font: " + this.style.font + ";") + this.style.strokeThickness;
this.canvas.height = lineHeight * lines.length;
//set canvas text styles
this.context.fillStyle = this.style.fill;
this.context.font = this.style.font;
this.context.strokeStyle = this.style.stroke;
this.context.lineWidth = this.style.strokeThickness;
this.context.textBaseline = "top";
//draw lines line by line
for (i = 0; i < lines.length; i++)
{
var linePosition = new PIXI.Point(this.style.strokeThickness / 2, this.style.strokeThickness / 2 + i * lineHeight);
if(this.style.align == "right")
{
linePosition.x += maxLineWidth - lineWidths[i];
}
else if(this.style.align == "center")
{
linePosition.x += (maxLineWidth - lineWidths[i]) / 2;
}
if(this.style.stroke && this.style.strokeThickness)
{
this.context.strokeText(lines[i], linePosition.x, linePosition.y);
}
if(this.style.fill)
{
this.context.fillText(lines[i], linePosition.x, linePosition.y);
}
}
this.updateTexture();
};
/**
* Updates texture size based on canvas size
* @private
*/
PIXI.Text.prototype.updateTexture = function()
{
this.texture.baseTexture.width = this.canvas.width;
this.texture.baseTexture.height = this.canvas.height;
this.texture.frame.width = this.canvas.width;
this.texture.frame.height = this.canvas.height;
this._width = this.canvas.width;
this._height = this.canvas.height;
PIXI.texturesToUpdate.push(this.texture.baseTexture);
};
/**
* @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!
*/
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;
};
/**
* A Text Object will apply wordwrap
* @private
*/
PIXI.Text.prototype.wordWrap = function(text)
{
// search good wrap position
var searchWrapPos = function(ctx, text, start, end, wrapWidth)
{
var p = Math.floor((end-start) / 2) + start;
if(p == start) {
return 1;
}
if(ctx.measureText(text.substring(0,p)).width <= wrapWidth)
{
if(ctx.measureText(text.substring(0,p+1)).width > wrapWidth)
{
return p;
}
else
{
return arguments.callee(ctx, text, p, end, wrapWidth);
}
}
else
{
return arguments.callee(ctx, text, start, p, wrapWidth);
}
};
var lineWrap = function(ctx, text, wrapWidth)
{
if(ctx.measureText(text).width <= wrapWidth || text.length < 1)
{
return text;
}
var pos = searchWrapPos(ctx, text, 0, text.length, wrapWidth);
return text.substring(0, pos) + "\n" + arguments.callee(ctx, text.substring(pos), wrapWidth);
};
var result = "";
var lines = text.split("\n");
for (var i = 0; i < lines.length; i++)
{
result += lineWrap(this.context, lines[i], this.style.wordWrapWidth) + "\n";
}
return result;
};
PIXI.Text.prototype.destroy = function(destroyTexture)
{
if(destroyTexture)
{
this.texture.destroy();
}
};
PIXI.Text.heightCache = {};
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