【问题标题】:Draw Font Awesome icons to canvas based on class names根据类名在画布上绘制 Font Awesome 图标
【发布时间】:2020-12-15 11:36:56
【问题描述】:

我希望能够:

  1. 为任何给定的 Font Awesome 类名称(fas fa-check-circle 等)获取 Font Awesome 5 unicode 字符
  2. 将该 Unicode 字符绘制到 html5 画布上

我该怎么做呢?

【问题讨论】:

    标签: javascript html5-canvas font-awesome font-face


    【解决方案1】:

    为 Font Awesome 5 图标类获取正确的 unicode 字符和其他重要数据并将其绘制到 html5 画布上:

    
    // create an icon with the Font Awesome class name you want
    const i = document.createElement('i');
    
    i.setAttribute('class', 'fas fa-check-circle');
    document.body.appendChild(i);
    
    // get the styles for the icon you just made
    const iStyles = window.getComputedStyle(i);
    const iBeforeStyles = window.getComputedStyle(i, ':before');
    
    const fontFamily = iStyles.getPropertyValue('font-family');
    const fontWeight = iStyles.getPropertyValue('font-weight');
    const fontSize = '40px'; // just to make things a little bigger...
    
    const canvasFont = `${fontWeight} ${fontSize} ${fontFamily}`; // should be something like: '900 40px "Font Awesome 5 Pro"'
    const icon = String.fromCodePoint(iBeforeStyles.getPropertyValue('content').codePointAt(1)); // codePointAt(1) because the first character is a double quote
    
    
    const ctx = myCanvas.getContext('2d');
    
    ctx.font = canvasFont;
    ctx.fillStyle = 'red';
    ctx.textAlign = 'center';
    ctx.fillText(icon, myCanvas.width / 2, myCanvas.height / 2);
    
    

    执行此操作时,请确保在绘图时实际加载了 Font Awesome 5 字体。我在测试时犯了只画一次的错误,结果只出现了一个框。加载图标后,它应该如下所示:

    【讨论】:

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