CanvasTextWrapper/CanvasTextWrapper.min.js

/*! CanvasTextWrapper (https://github.com/namniak/CanvasTextWrapper)
 *  Version:  0.1.0
 *
 *  MIT License (http://www.opensource.org/licenses/mit-license.html)
 *  Copyright (c) 2014 Vadim Namniak
 */
!function(){"use strict";var a={font:"18px Arial, sans-serif",textAlign:"left",verticalAlign:"top",paddingX:0,paddingY:0,fitParent:!1,lineBreak:"auto"};window.CanvasTextWrapper=function(b,c,d){if(!(this instanceof CanvasTextWrapper))throw new TypeError('CanvasTextWrapper constructor failed. Use "new" keyword when instantiating.');this.canvas=b,this.text=c;for(var e in a)this[e]=d&&d[e]?d[e]:a[e];this.lineHeight=parseInt(this.font.replace(/^\D+/g,""),10),this.validate(),this.context=this.canvas.getContext("2d"),this.context.font=this.font,this.context.textBaseline="bottom",this.drawText()},CanvasTextWrapper.prototype={drawText:function(){var a=this.canvas,b=a.getContext("2d"),c=this.fitParent===!1?a.width:a.parentNode.clientWidth,d=c-2*this.paddingX,e=this.text.split(/\s+/),f=[],g={x:0,y:0};this.checkWordsLength(b,e,d),this.breakTextIntoLines(b,f,e,d);var h=f.length*this.lineHeight;this.setTextVerticalAlign(g,h);for(var i=0;i<f.length;i++)this.setTextHorizontalAlign(b,g,c,f[i]),g.y=parseInt(g.y)+parseInt(this.lineHeight),b.fillText(f[i],g.x,g.y)},checkWordsLength:function(a,b,c){for(var d=0;d<b.length;d++){var e="",f=a.measureText(b[d]).width;if(f>c){for(var g=0;a.measureText(e+b[d][g]).width<=c&&g<b[d].length;g++)e+=b[d][g];var h=b[d].slice(0,g),i=b[d].slice(g);b.splice(d,1,h,i)}}},breakTextIntoLines:function(a,b,c,d){for(var e=0,f=0;e<c.length;f++)if(b[f]="","auto"===this.lineBreak){for(;a.measureText(b[f]+c[e]).width<=d&&e<c.length;)b[f]+=c[e]+" ",e++;b[f]=b[f].trim()}else"word"===this.lineBreak&&(b[f]=c[e],e++)},setTextHorizontalAlign:function(a,b,c,d){b.x="center"===this.textAlign?(c-a.measureText(d).width)/2:"right"===this.textAlign?c-a.measureText(d).width-this.paddingX:this.paddingX},setTextVerticalAlign:function(a,b){var c=this.fitParent===!1?this.canvas.height:this.canvas.parentNode.clientHeight;a.y="middle"===this.verticalAlign?(c-b)/2:"bottom"===this.verticalAlign?c-b-this.paddingY:this.paddingY},validate:function(){if(!(this.canvas instanceof HTMLCanvasElement))throw new TypeError("From CanvasTextWrapper(): Element passed as the first parameter is not an instance of HTMLCanvasElement.");if("string"!=typeof this.text)throw new TypeError("From CanvasTextWrapper(): The second, dedicated for the text, parameter must be a string.");if(isNaN(this.lineHeight))throw new TypeError('From CanvasTextWrapper(): Cannot parse font size as an Integer. Check "font" property\'s value.');if("left"!==this.textAlign&&"center"!==this.textAlign&&"right"!==this.textAlign)throw new TypeError('From CanvasTextWrapper(): Unsupported horizontal align value is used. Property "textAlign" can only be set to "left", "center", or "right".');if("top"!==this.verticalAlign&&"middle"!==this.verticalAlign&&"bottom"!==this.verticalAlign)throw new TypeError('From CanvasTextWrapper(): Unsupported vertical align value is used. Property "verticalAlign" can only be set to "top", "middle", or "bottom".');if(isNaN(this.paddingX))throw new TypeError('From CanvasTextWrapper(): Unsupported horizontal padding value is used. Property "paddingX" must be set to a number');if(isNaN(this.paddingY))throw new TypeError('From CanvasTextWrapper(): Unsupported vertical padding value is used. Property "paddingY" must be set to a number.');if("boolean"!=typeof this.fitParent)throw new TypeError('From CanvasTextWrapper(): Property "fitParent" must be set to a Boolean.');if("auto"!==this.lineBreak&&"word"!==this.lineBreak)throw new TypeError('From CanvasTextWrapper(): Unsupported line break value is used. Property "lineBreak" can only be set to "auto", or "word".')}}}();