CSS |笔画不透明度属性

原文:https://www.geeksforgeeks.org/css-stroke-opacity-property/

笔画不透明度属性用于设置应用于形状笔画的颜色或图案的不透明度。十进制或百分比值可用于使笔划可见、不可见或半透明。

语法:

stroke-opacity: [0-1] | <percentage>

参数:该属性接受两种类型的参数，如上所述，如下所述:

  • [0-1]: 用于设置不透明度为从 0 到 1 的十进制值。值为 0 意味着笔画是完全透明和不可见的。值为 1 表示笔画完全不透明且可见。这两个值之间的十进制值会产生半透明的笔画。
  • 百分比:用于以百分比值设置不透明度。0%的值意味着笔划完全透明和不可见。值为 100%意味着笔划完全不透明且可见。这两个值之间的百分比值将给出半透明的笔画。

以下示例将说明 CSS 中的笔画不透明度属性:

示例 1: 本示例使用 0 到 1 的值来设置笔画不透明度。

<!DOCTYPE html>
<html>

<head>
    <title>
        CSS | stroke-opacity property
    </title>

    <style>
        .stroke1 {

            /* completely visible stroke */
            stroke-opacity: 1.0;
            stroke: green;
            stroke-width: 20px;
        }

        .stroke2 {

            /* 50-50 visible transparent */
            stroke-opacity: 0.5;
            stroke: green;
            stroke-width: 20px;
        }

        .stroke3 {

            /* 25-75 visible transparent */
            stroke-opacity: 0.25;
            stroke: green;
            stroke-width: 20px;
        }

        .stroke4 {

            /* completely transparent stroke */
            stroke-opacity: 0;
            stroke: green;
            stroke-width: 20px;
        }
    </style>
</head>

<body style="text-align:center;">

    <h1 style="color: green">
        GeeksforGeeks
    </h1>

    <b>
        CSS | stroke-opacity
    </b>

    <div class="container">

        <!-- Strokes lines-->
        <svg width="400px">
            <line class="stroke1" x1="50"
                    x2="350" y1="20" y2="20" />

            <line class="stroke2" x1="50"
                    x2="350" y1="70" y2="70" />

            <line class="stroke3" x1="50"
                    x2="350" y1="120" y2="120" />

            <line class="stroke4" x1="50"
                    x2="350" y1="170" y2="170" />
        </svg>
    </div>
</body>

</html>

输出: decimal-val

示例 2: 本示例使用百分比值来设置笔画不透明度。

<!DOCTYPE html>
<html>

<head>
    <title>
        CSS | stroke-opacity property
    </title>

    <style>
        .stroke1 {

            /* completely visible stroke */
            stroke-opacity: 100%;
            stroke: green;
            stroke-width: 20px;
        }

        .stroke2 {

            /* 50-50 visible transparent */
            stroke-opacity: 50%;
            stroke: green;
            stroke-width: 20px;
        }

        .stroke3 {

            /* 25-75 visible transparent */
            stroke-opacity: 25%;
            stroke: green;
            stroke-width: 20px;
        }

        .stroke4 {

            /* completely transparent stroke */
            stroke-opacity: 0%;
            stroke: green;
            stroke-width: 20px;
        }
    </style>
</head>

<body style="text-align:center;">

    <h1 style="color: green">
        GeeksforGeeks
    </h1>

    <b>
        CSS | stroke-opacity
    </b>

    <div class="container">

        <!-- Strokes lines-->
        <svg width="400px">
            <line class="stroke1" x1="50"
                    x2="350" y1="20" y2="20" />

            <line class="stroke2" x1="50"
                    x2="350" y1="70" y2="70" />

            <line class="stroke3" x1="50"
                    x2="350" y1="120" y2="120" />

            <line class="stroke4" x1="50"
                    x2="350" y1="170" y2="170" />
        </svg>
    </div>
</body>

</html>

输出: decimal-val

支持的浏览器:CSS 笔画不透明度属性支持的浏览器如下:

  • 铬
  • Internet Explorer 9
  • 火狐浏览器
  • 旅行队
  • 歌剧

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