如何自动在svg svg中自动换行? [英] How to auto text wrap text in snap svg?

问题描述

使用以下插件和代码，您可以将文本包裹在\n处:

Using the following plugin and code you could wrap text where there is \n :

Snap.plugin(function (Snap, Element, Paper, glob) {
    Paper.prototype.multitext = function (x, y, txt) {
        txt = txt.split("\n");
        var t = this.text(x, y, txt);
        t.selectAll("tspan:nth-child(n+2)").attr({
            dy: "1.2em",
            x: x
        });
        return t;
    };
});

//您可以像这样使用它:

// And you can use it like this:

var ttt = paper.multitext(100, 100, "Sample\nmultiline\ntext").attr({
    font: "18px Arial",
    textAnchor: "middle"
}); 

它会产生: http://jsbin.com/panaxujuta/1/edit? html，output

              Smaple
             multiline
               text

如何使用rect Width作为长短语或段落的行数限制来自动执行此过程?我不想为了以后需要文本而在svg中使用foreignobject.请使用本机svg解决方案.任何想法将不胜感激.

How can I automate this process using a rect Width as the limit for the lines of a long phrase or paragraph ? I don't want to use the foreignobject in svg for the purpose that I need the text later on . A native svg solution please. Any ideas would be greatly appreciated.

编辑:如何在\n上拆分而不是在文本行的特定宽度上拆分?

Edit: Instead of splitting on \n how can we split on certain width of a line of a text?

Edit2 :我有使用上述插件的代码，为什么这样不起作用?:

Edit2: I have this code that uses the above plugin, why this wouldn't work?:

var phrase = "Etiam porttitor risus in ex blandit sodales. Ut cursus mi augue, sit amet interdum diam interdum sit amet. Nunc nec lectus ex.";
var textBoxWidth = 400;
var words = phrase.split(" ");
var newPhrase = words[0];

 var t1 = paper.multitext(10,50,newPhrase)
  .attr({
    fill: "none",
    stroke:"orange",
    "text-anchor":"start",
    "font-size":"18px",
    "font-family":"Arial"});
for(i=1;i<words.length;i++){
    t1.attr({"text":newPhrase + " " + words[i]});
    if(t1.getBBox().width<=textBoxWidth){
        newPhrase += " " + words[i];
    } else {
        newPhrase += " \n" + words[i]  ;
    } 

}

推荐答案

感谢发布.我有一些按长度包装的代码，但是因为没有使用text()的数组版本而遇到麻烦.

Thanks for posting this. I had some of the wrapping to length code, but was having trouble because I wasn't using the array version of text().

问题是您必须先了解字体大小，然后才能限制字符串.我能够根据您的代码进行此操作，并根据 https://stackoverflow.com/a/9899369/9970 来包装逻辑一个>.它并不完美，如果您缓存每种字体/大小的字母宽度，它可能会更快.

The issue is you have to know the font size before you can limit the string. I was able to make this based off your code and wrapping logic based off https://stackoverflow.com/a/9899369/9970. Its not perfect and could be faster if you cached the letter widths per font/size.

  Snap.plugin(function (Snap, Element, Paper, glob) {
     Paper.prototype.multitext = function (x, y, txt, max_width, attributes) {

        var svg = Snap();
        var abc = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        var temp = svg.text(0, 0, abc);
        temp.attr(attributes);
        var letter_width = temp.getBBox().width / abc.length;
        svg.remove();

        var words = txt.split(" ");
        var width_so_far = 0, current_line=0, lines=[''];
        for (var i = 0; i < words.length; i++) {

           var l = words[i].length;
           if (width_so_far + (l * letter_width) > max_width) {
              lines.push('');
              current_line++;
              width_so_far = 0;
           }
           width_so_far += l * letter_width;
           lines[current_line] += words[i] + " ";
        }

        var t = this.text(x,y,lines).attr(attributes);
        t.selectAll("tspan:nth-child(n+2)").attr({
           dy: "1.2em",
           x: x
        });
        return t;
     };
  });

像这样使用

var bobo = paper.multitext(50, 50, "bobo bobo bobo bobo bobo bobo bobo bobo bobo", 150,
    { "font-size": "30px" });

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