如何使用Text-anchor:Fabric JS中的 [英] How to use text-anchor : middle in fabric js

问题描述

我已经从Fabric js创建了svg.创建卡片时，我使用以下代码将文本对齐方式应用于对象:

I have created svg from fabric js. While creating card i have applied text-align to object using below code:

activeObj.set({
    textAlign : 'center',
});
canvas.renderAll();

所以我的svg如下图所示:

So my svg is look like below:

https://codepen.io/dhavalsisodiya/pen/BrRbRG

现在，当我将{company_address}地址变量更改为原始值时，该文本应居中对齐，但不是.

Now when i changed my {company_address} address variable with original value, that text should be align center but it is not.

https://codepen.io/dhavalsisodiya/pen/VXbRzy

然后我手动修改了SVG，我在SVG的tspan标签中添加了text-anchor="middle"(这是我的变量的位置)

Then i have modified SVG manually, I have added text-anchor="middle" in tspan tag of SVG (that is the placing of my varaible)

https://codepen.io/dhavalsisodiya/pen/ZxKPab

添加我的文字后，该文字显示在SVG中.

After adding that my text is appearing center in SVG.

那么有没有一种方法可以使用fabric js，所以当我应用文本对齐方式时它包含text-anchor="middle"?

So is there a way to do that using fabric js, so it contain text-anchor="middle" when i apply text alignment?

我也应用了textAnchor，但是它没有转换为svg.

I have applied the textAnchor also, but it is not converting to svg.

https://codepen.io/dhavalsisodiya/pen/gvQooL

推荐答案

感谢@AndreaBogazzi，我能够使用以下方法解决该问题:

Thanks to @AndreaBogazzi, i was able to resolve it using below method:

我用以下内容修改了Fabric js文件:

I have modified fabric js file with below:

按照@AndreaBogazzi的建议在_wrapSVGTextAndBg: function(markup, textAndBg) {中添加了'text-anchor="' + this.textAnchor + '" ',.

Added 'text-anchor="' + this.textAnchor + '" ', in _wrapSVGTextAndBg: function(markup, textAndBg) { as @AndreaBogazzi suggested.

/**
 * @private
 */
_wrapSVGTextAndBg: function(markup, textAndBg) {
  var noShadow = true, filter = this.getSvgFilter(),
      style = filter === '' ? '' : ' style="' + filter + '"',
      textDecoration = this.getSvgTextDecoration(this);
  markup.push(
    '\t<g ', this.getSvgId(), 'transform="', this.getSvgTransform(), this.getSvgTransformMatrix(), '"',
    style, '>\n',
    textAndBg.textBgRects.join(''),
    '\t\t<text xml:space="preserve" ',
    'text-anchor="' + this.textAnchor + '" ',
    (this.fontFamily ? 'font-family="' + this.fontFamily.replace(/"/g, '\'') + '" ' : ''),
    (this.fontSize ? 'font-size="' + this.fontSize + '" ' : ''),
    (this.fontStyle ? 'font-style="' + this.fontStyle + '" ' : ''),
    (this.fontWeight ? 'font-weight="' + this.fontWeight + '" ' : ''),
    (textDecoration ? 'text-decoration="' + textDecoration + '" ' : ''),
    'style="', this.getSvgStyles(noShadow), '"', this.addPaintOrder(), ' >',
    textAndBg.textSpans.join(''),
    '</text>\n',
    '\t</g>\n'
  );
},

然后我在下面进行了修改:

Then i have modified below:

_createTextCharSpan: function(_char, styleDecl, left, top) {
  var styleProps = this.getSvgSpanStyles(styleDecl, _char !== _char.trim()),
      fillStyles = styleProps ? 'style="' + styleProps + '"' : '';

    //Addded to support text-anhor middle
    if(this.textAnchor==='middle')
    {
        return [
            '\t\t\t<tspan  ',
            fillStyles, '>',
            fabric.util.string.escapeXml(_char),
            '</tspan>\n'
        ].join('');
    }
    else
    {
        return [
            '\t\t\t<tspan x="', toFixed(left, NUM_FRACTION_DIGITS), '" y="',
            toFixed(top, NUM_FRACTION_DIGITS), '" ',
            fillStyles, '>',
            fabric.util.string.escapeXml(_char),
            '</tspan>\n'
          ].join('');
    }
},

扩展toObjectTo以在json中添加textAnchor，请参见此处:扩展toObject :

Extend the toObjectTo to add textAnchor in json, see here: extend toObject :

$('.text_alignment').click(function(){
   var cur_value = $(this).attr('data-action');
    var activeObj = canvas.getActiveObject();
    if (cur_value != '' && activeObj) {
        activeObj.set({
            textAlign : cur_value,
            textAnchor : 'middle'
        });
        //To modify Object
        activeObj.toObject = (function(toObject) {
          return function() {
            return fabric.util.object.extend(toObject.call(this), {
              textAnchor: 'middle'
            });
          };
        })(activeObj.toObject);

        //activeObj.textAnchor  = cur_value;
        canvas.renderAll();
    }
    else
    {
        alert('Please select text');
        return false;
    }
});

通过进行上述更改，现在即使我修改了文字，我的变量仍处于中间位置.

By making above changes, now my variable stays middle even if i modified text.

这篇关于如何使用Text-anchor:Fabric JS中的的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！