arctext.js实现文字平滑弯曲弧形效果的插件


Posted in Javascript onMay 13, 2019

本文介绍了实现文字平滑弯曲弧形效果的插件-arctext.js,分享给大家,具体如下:

arctext.js实现文字平滑弯曲弧形效果的插件

扇形的文字

有时候产品大佬就是很任性,说做一个宣传页,一个类似拱门的效果,每次文字不一样,但是文字得呈现拱形状,类似上图啦。

尝试自己使用canvas画和css3的rotate旋转div,两种方法都是计算旋转角度的时候很麻烦,因为可能5个字10个字,但是得均匀地呈拱形分布,要知道让每个文字都沿着弯曲路径排布相当的复杂,于是便发现了这个好用的插件---arctext.js

它能够自动计算每个文字正确的旋转角度,并且生成对应的CSS ,其实就是基于css3和jquery,使用起来也很方便。

1.创建一个容器装文字

<h3 id="title">文字弯曲效果类似扇形拱桥状</h3>

2.引入jquery和arctext.js

<script type="text/javascript" src="//code.jquery.com/jquery-1.8.2.min.js" ></script>
<script src="jquery.arctext.js"></script>

3.调用arctext的方法:

$(function(){
    $("#title").show().arctext({
      radius:180
    })
  })

arctext参数说明:

  • radius:弯曲度数,最小的值是文字长度,如果设置为-1,则显示直线。
  • rotate:默认true,为false则不旋转文字
  • dir:默认1 (1:向下弯曲 非1(-1,0,2等):向上弯曲 )
  • fitText:默认false,如果你想尝试使用fitText插件,设置为true,记住包装的标签需要fluid布局。

效果图完整demo:

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <style>
   #title{
      font-size: 20px;
      color: #ffe400;
      text-align: center;
    }
  </style>
</head>
<body>
  <h3 id="title">文字弯曲效果类似扇形拱桥状</h3>
<script type="text/javascript" src="//code.jquery.com/jquery-1.8.2.min.js" ></script>
<script src="jquery.arctext.js"></script>
<script>
  $(function(){
    $("#title").arctext({
      radius:180
    })
  })
</script>
</body>
</html>

jquery.arctext.js

/**
 * Arctext.js
 * A jQuery plugin for curved text
 * http://www.codrops.com
 *
 * Copyright 2011, Pedro Botelho / Codrops
 * Free to use under the MIT license.
 *
 * Date: Mon Jan 23 2012
 */

(function( $, undefined ) {
  
  /*! 
  * FitText.js 1.0
  *
  * Copyright 2011, Dave Rupert http://daverupert.com
  * Released under the WTFPL license 
  * http://sam.zoy.org/wtfpl/
  *
  * Date: Thu May 05 14:23:00 2011 -0600
  */
  $.fn.fitText = function( kompressor, options ) {

    var settings = {
      'minFontSize' : Number.NEGATIVE_INFINITY,
      'maxFontSize' : Number.POSITIVE_INFINITY
    };

    return this.each(function() {
      var $this = $(this);       // store the object
      var compressor = kompressor || 1; // set the compressor
  
      if ( options ) { 
       $.extend( settings, options );
      }
  
      // Resizer() resizes items based on the object width divided by the compressor * 10
      var resizer = function () {
        $this.css('font-size', Math.max(Math.min($this.width() / (compressor*10), parseFloat(settings.maxFontSize)), parseFloat(settings.minFontSize)));
      };

      // Call once to set.
      resizer();

      // Call on resize. Opera debounces their resize by default. 
      $(window).resize(resizer);
    });

  };

  /*
   * Lettering plugin
   *
   * changed injector function:
   *  add   for empty chars.
   */
  function injector(t, splitter, klass, after) {
    var a = t.text().split(splitter), inject = '', emptyclass;
    if (a.length) {
      $(a).each(function(i, item) {
        emptyclass = '';
        if(item === ' ') {
          emptyclass = ' empty';
          item=' ';
        }  
        inject += '<span class="'+klass+(i+1)+emptyclass+'">'+item+'</span>'+after;
      }); 
      t.empty().append(inject);
    }
  }
  
  var methods       = {
    init : function() {

      return this.each(function() {
        injector($(this), '', 'char', '');
      });

    },

    words : function() {

      return this.each(function() {
        injector($(this), ' ', 'word', ' ');
      });

    },
    
    lines : function() {

      return this.each(function() {
        var r = "eefec303079ad17405c889e092e105b0";
        // Because it's hard to split a <br/> tag consistently across browsers,
        // (*ahem* IE *ahem*), we replaces all <br/> instances with an md5 hash 
        // (of the word "split"). If you're trying to use this plugin on that 
        // md5 hash string, it will fail because you're being ridiculous.
        injector($(this).children("br").replaceWith(r).end(), r, 'line', '');
      });

    }
  };

  $.fn.lettering     = function( method ) {
    // Method calling logic
    if ( method && methods[method] ) {
      return methods[ method ].apply( this, [].slice.call( arguments, 1 ));
    } else if ( method === 'letters' || ! method ) {
      return methods.init.apply( this, [].slice.call( arguments, 0 ) ); // always pass an array
    }
    $.error( 'Method ' + method + ' does not exist on jQuery.lettering' );
    return this;
  };
  
  /*
   * Arctext object.
   */
  $.Arctext        = function( options, element ) {
  
    this.$el  = $( element );
    this._init( options );
    
  };
  
  $.Arctext.defaults   = {
    radius : 0,  // the minimum value allowed is half of the word length. if set to -1, the word will be straight.
    dir   : 1,  // 1: curve is down, -1: curve is up.
    rotate : true, // if true each letter will be rotated.
    fitText : false // if you wanna try out the fitText plugin (http://fittextjs.com/) set this to true. Don't forget the wrapper should be fluid.
  };
  
  $.Arctext.prototype   = {
    _init        : function( options ) {
      
      this.options    = $.extend( true, {}, $.Arctext.defaults, options );
      
      // apply the lettering plugin.
      this._applyLettering();
      
      this.$el.data( 'arctext', true );
      
      // calculate values
      this._calc();
      
      // apply transformation.
      this._rotateWord();
      
      // load the events
      this._loadEvents();
      
    },
    _applyLettering   : function() {
    
      this.$el.lettering();
      
      if( this.options.fitText )
        this.$el.fitText();
      
      this.$letters  = this.$el.find('span').css('display', 'inline-block');
    
    },
    _calc        : function() {
      
      if( this.options.radius === -1 )
        return false;
      
      // calculate word / arc sizes & distances.
      this._calcBase();
      
      // get final values for each letter.
      this._calcLetters();
    
    },
    _calcBase      : function() {
      
      // total word width (sum of letters widths)
      this.dtWord   = 0;
      
      var _self    = this;
      
      this.$letters.each( function(i) {
                
        var $letter     = $(this),
          letterWidth   = $letter.outerWidth( true );
        
        _self.dtWord += letterWidth;
        
        // save the center point of each letter:
        $letter.data( 'center', _self.dtWord - letterWidth / 2 );
        
      });
      
      // the middle point of the word.
      var centerWord = this.dtWord / 2;
      
      // check radius : the minimum value allowed is half of the word length.
      if( this.options.radius < centerWord )
        this.options.radius = centerWord;
      
      // total arc segment length, where the letters will be placed.
      this.dtArcBase = this.dtWord;
      
      // calculate the arc (length) that goes from the beginning of the first letter (x=0) to the end of the last letter (x=this.dtWord).
      // first lets calculate the angle for the triangle with base = this.dtArcBase and the other two sides = radius.
      var angle    = 2 * Math.asin( this.dtArcBase / ( 2 * this.options.radius ) );
      
      // given the formula: L(ength) = R(adius) x A(ngle), we calculate our arc length.
      this.dtArc   = this.options.radius * angle;
      
    },
    _calcLetters    : function() {
      
      var _self    = this,
        iteratorX  = 0;
        
      this.$letters.each( function(i) {
          
        var $letter     = $(this),
          // calculate each letter's semi arc given the percentage of each letter on the original word.
          dtArcLetter   = ( $letter.outerWidth( true ) / _self.dtWord ) * _self.dtArc,
          // angle for the dtArcLetter given our radius.
          beta      = dtArcLetter / _self.options.radius,
          // distance from the middle point of the semi arc's chord to the center of the circle.
          // this is going to be the place where the letter will be positioned.
          h        = _self.options.radius * ( Math.cos( beta / 2 ) ),
          // angle formed by the x-axis and the left most point of the chord.
          alpha      = Math.acos( ( _self.dtWord / 2 - iteratorX ) / _self.options.radius ),
          // angle formed by the x-axis and the right most point of the chord.
          theta      = alpha + beta / 2,
          // distances of the sides of the triangle formed by h and the orthogonal to the x-axis.
          x        = Math.cos( theta ) * h,
          y        = Math.sin( theta ) * h,
          // the value for the coordinate x of the middle point of the chord.
          xpos      = iteratorX + Math.abs( _self.dtWord / 2 - x - iteratorX ),
          // finally, calculate how much to translate each letter, given its center point.
          // also calculate the angle to rotate the letter accordingly.
          xval  = 0| xpos - $letter.data( 'center' ),
          yval  = 0| _self.options.radius - y,
          angle  = ( _self.options.rotate ) ? 0| -Math.asin( x / _self.options.radius ) * ( 180 / Math.PI ) : 0;
        
        // the iteratorX will be positioned on the second point of each semi arc
        iteratorX = 2 * xpos - iteratorX;
        
        // save these values
        $letter.data({
          x  : xval,
          y  : ( _self.options.dir === 1 ) ? yval : -yval,
          a  : ( _self.options.dir === 1 ) ? angle : -angle
        });
          
      });
    
    },
    _rotateWord     : function( animation ) {
      
      if( !this.$el.data('arctext') ) return false;
      
      var _self = this;
      
      this.$letters.each( function(i) {
        
        var $letter     = $(this),
          transformation = ( _self.options.radius === -1 ) ? 'none' : 'translateX(' + $letter.data('x') + 'px) translateY(' + $letter.data('y') + 'px) rotate(' + $letter.data('a') + 'deg)',
          transition   = ( animation ) ? 'all ' + ( animation.speed || 0 ) + 'ms ' + ( animation.easing || 'linear' ) : 'none';
        
        $letter.css({
          '-webkit-transition' : transition,
          '-moz-transition' : transition,
          '-o-transition' : transition,
          '-ms-transition' : transition,
          'transition' : transition
        })
        .css({
          '-webkit-transform' : transformation,
          '-moz-transform' : transformation,
          '-o-transform' : transformation,
          '-ms-transform' : transformation,
          'transform' : transformation
        });
      
      });
      
    },
    _loadEvents     : function() {
      
      if( this.options.fitText ) {
      
        var _self = this;
        
        $(window).on( 'resize.arctext', function() {
          
          _self._calc();
          
          // apply transformation.
          _self._rotateWord();
          
        });
      
      }
    
    },
    set         : function( opts ) {
      
      if( !opts.radius && 
        !opts.dir &&
        opts.rotate === 'undefined' ) {
          return false;
      }
      
      this.options.radius = opts.radius || this.options.radius;
      this.options.dir  = opts.dir || this.options.dir;
      
      if( opts.rotate !== undefined ) {
        this.options.rotate = opts.rotate;
      }  
      
      this._calc();
      
      this._rotateWord( opts.animation );
      
    },
    destroy       : function() {
      
      this.options.radius = -1;
      this._rotateWord();
      this.$letters.removeData('x y a center');
      this.$el.removeData('arctext');
      $(window).off('.arctext');
      
    }
  };
  
  var logError      = function( message ) {
    if ( this.console ) {
      console.error( message );
    }
  };
  
  $.fn.arctext      = function( options ) {
  
    if ( typeof options === 'string' ) {
      
      var args = Array.prototype.slice.call( arguments, 1 );
      
      this.each(function() {
      
        var instance = $.data( this, 'arctext' );
        
        if ( !instance ) {
          logError( "cannot call methods on arctext prior to initialization; " +
          "attempted to call method '" + options + "'" );
          return;
        }
        
        if ( !$.isFunction( instance[options] ) || options.charAt(0) === "_" ) {
          logError( "no such method '" + options + "' for arctext instance" );
          return;
        }
        
        instance[ options ].apply( instance, args );
      
      });
    
    } 
    else {
    
      this.each(function() {
      
        var instance = $.data( this, 'arctext' );
        if ( !instance ) {
          $.data( this, 'arctext', new $.Arctext( options, this ) );
        }
      });
    
    }
    
    return this;
    
  };
  
})( jQuery );

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持三水点靠木。

Javascript 相关文章推荐
动态修改DOM 里面的 id 属性的弊端分析
Sep 03 Javascript
js TextArea的选中区域处理
Dec 28 Javascript
SinaEditor使用方法详解
Dec 28 Javascript
深入理解JavaScript编程中的原型概念
Jun 25 Javascript
jQuery选择器用法实例详解
Dec 17 Javascript
实现高性能JavaScript之执行与加载
Jan 30 Javascript
Vue.js 2.0窥探之Virtual DOM到底是什么?
Feb 10 Javascript
vue-router路由模式详解(小结)
Aug 26 Javascript
layui关闭弹窗后刷新主页面和当前更改项的例子
Sep 06 Javascript
p5.js绘制旋转的正方形
Oct 23 Javascript
node.js域名解析实现方法详解
Nov 05 Javascript
vue 解除鼠标的监听事件的方法
Nov 13 Javascript
vue项目前端知识点整理【收藏】
May 13 #Javascript
使用jQuery如何写一个含验证码的登录界面
May 13 #jQuery
JQuery特殊效果和链式调用操作示例
May 13 #jQuery
JQuery的加载和选择器用法简单示例
May 13 #jQuery
koa+mongoose实现简单增删改查接口的示例代码
May 13 #Javascript
如何利用vue+vue-router+elementUI实现简易通讯录
May 13 #Javascript
vue百度地图 + 定位的详解
May 13 #Javascript
You might like
无数据库的详细域名查询程序PHP版(5)
2006/10/09 PHP
PHP 创建文件(文件夹)以及目录操作代码
2010/03/04 PHP
PHP 编写大型网站问题集
2010/05/07 PHP
php switch语句多个值匹配同一代码块应用示例
2014/07/29 PHP
smarty简单入门实例
2014/11/28 PHP
PHP对象相关知识总结
2017/04/09 PHP
根据对象的某一属性进行排序的js代码(如:name,age)
2010/08/10 Javascript
JSON语法五大要素图文介绍
2012/12/04 Javascript
js获取URL的参数的方法(getQueryString)示例
2013/09/29 Javascript
我的Node.js学习之路(一)
2014/07/06 Javascript
jQuery实现“扫码阅读”功能
2015/01/21 Javascript
React.js入门学习第一篇
2016/03/30 Javascript
ionic进入多级目录后隐藏底部导航栏(tabs)的完美解决方案
2016/11/23 Javascript
关于ES6的六个小特性(二)
2017/02/20 Javascript
js图片放大镜实例讲解(必看篇)
2017/07/17 Javascript
微信小程序时间轴实现方法示例
2019/01/14 Javascript
vue+koa2实现session、token登陆状态验证的示例
2019/08/30 Javascript
如何配置vue.config.js 处理static文件夹下的静态文件
2020/06/19 Javascript
Python实现自动登录百度空间的方法
2017/06/10 Python
python实现将excel文件转化成CSV格式
2018/03/22 Python
python爬虫自动创建文件夹的功能
2018/08/01 Python
详解pandas.DataFrame中删除包涵特定字符串所在的行
2019/04/04 Python
利用Python检测URL状态
2019/07/31 Python
opencv-python的RGB与BGR互转方式
2020/06/02 Python
python map比for循环快在哪
2020/09/21 Python
意大利制造的男鞋和女鞋:SCAROSSO
2018/03/07 全球购物
在购买印度民族服饰:Soch
2020/09/15 全球购物
医生自荐信
2013/10/11 职场文书
医学专业大学生求职的自我评价
2013/11/27 职场文书
怎样写演讲稿
2014/01/04 职场文书
培训主管岗位职责
2014/02/01 职场文书
政府绩效管理实施方案
2014/05/04 职场文书
2014年党员承诺书范文
2014/05/20 职场文书
党支部先进事迹材料
2014/12/24 职场文书
党员干部公开承诺书范文
2015/04/27 职场文书
浅谈Python中对象是如何被调用的
2022/04/06 Python