具有两种颜色的 SVG/CSS 描边虚线 - 可能吗？
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SVG/CSS stroke dashed line with two colors - is it possible?
提问by Andrew Mao
Is it possible to use CSS to define a line (or shape edge) with two alternating colors that are dashed? That is, if 1 and 2 are different colored pixels, then
是否可以使用 CSS 来定义具有两种交替颜色的虚线（或形状边缘）？也就是说，如果 1 和 2 是不同颜色的像素，那么
1212121212121212 or 112211221122
1212121212121212 或 112211221122
I basically want some way to use stroke-dasharray with two colors. The line itself is completely colored.
我基本上想要一些方法来使用两种颜色的stroke-dasharray。线条本身是完全彩色的。
If this is not possible, what is a good way to approximate it? For example, I could create a repeated linear gradient with two colors alternating, but this would be hard to set the two colors from javascript.
如果这是不可能的，那么近似它的好方法是什么？例如，我可以创建一个具有两种颜色交替的重复线性渐变，但是这很难从 javascript 设置这两种颜色。
回答by methodofaction
This is not possible in SVG with just one element, but you can use two different rects and then apply a stroke-dashoffset: x...
这在只有一个元素的 SVG 中是不可能的，但是您可以使用两个不同的矩形，然后应用stroke-dashoffset: x...
<svg xmlns="http://www.w3.org/2000/svg">
<rect class="stroke-red" x="10" y="10" width="101" height="101" />
<rect class="stroke-green" x="10" y="10" width="101" height="101" />
</svg>
rect.stroke-red {
stroke: red;
fill: none;
stroke-width: 5;
}
rect.stroke-green {
stroke: green;
fill: none;
stroke-dasharray: 5,5;
stroke-width: 5;
}
回答by Colin Young
Building on the answer from @duopixel, you can use the stroke-dasharrayproperty to build up a fairly complex pattern with multiple colors:
基于@duopixel 的答案，您可以使用该stroke-dasharray属性来构建具有多种颜色的相当复杂的图案：
.L4 {
stroke: #000;
stroke-dasharray: 20,10,5,5,5,10;
}
.L5 {
stroke: #AAA;
stroke-dasharray: 0,20,10,15,10,0
}
.L6 {
stroke: #DDD;
stroke-dasharray: 0,35,5,15
}
See http://jsfiddle.net/colin_young/Y38u9/demonstrating lines and a circle with the composite dash pattern.
请参阅http://jsfiddle.net/colin_young/Y38u9/演示线条和带有复合虚线图案的圆圈。
Updated with SO snippet:
更新了 SO 片段：
svg {
width: 100%;
height: 160px;
}
path, circle {
stroke-width: 4;
}
text {
alignment-baseline: central;
font-family: sans-serif;
font-size: 10px;
stroke-width: 0;
fill: #000;
text-anchor: middle;
}
.dim {
stroke: #AAA;
stroke-width: 1;
stroke-dasharray: 1, 1;
}
circle.dim {
fill: #FFF;
}
.L4 {
stroke: #000;
stroke-dasharray: 20, 10, 5, 5, 5, 10;
}
.L5 {
stroke: #AAA;
stroke-dasharray: 0, 20, 10, 15, 10, 0
}
.L6 {
stroke: #DDD;
stroke-dasharray: 0, 35, 5, 15
}<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<g fill="none" stroke="black">
<path class="dim" d="M5 20 l0 80" />
<path class="dim" d="M25 20 l0 80 l-10 20" />
<path class="dim" d="M35 20 l0 80 l-10 30" />
<path class="dim" d="M40 20 l0 120" />
<path class="dim" d="M45 20 l0 80 l10 30" />
<path class="dim" d="M50 20 l0 80 l10 20" />
<path class="dim" d="M60 20 l0 80 l15 10" />
<text x="5" y="110">0</text>
<text x="5" y="125">20</text>
<text x="25" y="135">30</text>
<text x="40" y="150">35</text>
<text x="55" y="140">40</text>
<text x="65" y="125">45</text>
<text x="82" y="115">55</text>
<path class="L4" d="M5 20 l215 0" />
<path class="L5" d="M5 20 l215 0" />
<path class="L6" d="M5 20 l215 0" />
<!-- separated to show composition -->
<text x="5" y="70" style="text-anchor:start">Separated to show composition:</text>
<path class="L4" d="M5 80 l215 0" />
<path class="L5" d="M5 90 l215 0" />
<path class="L6" d="M5 100 l215 0" />
<circle class="L4" cx="400" cy="80" r="60" />
<circle class="L5" cx="400" cy="80" r="60" />
<circle class="L6" cx="400" cy="80" r="60" />
</g>
</svg>回答by reisio
One way:
单程：
<!doctype html>
<html>
<head>
<title></title>
<style>
div {
width: 100px;
height: 100px;
}
.dashbox {
border: 4px dashed blue;
background: orange;
}
.dashbox > div {
background: white;
}
</style>
</head>
<body>
<div class="dashbox">
<div></div>
</div>
</body>
</html>
That is, layer one element with one color behind another with another color [in the form of a dashed stroke].
也就是说，将具有一种颜色的一个元素叠加在另一种颜色的另一个元素之后[以虚线笔划的形式]。
回答by eddieberklee
For a border that has 50 dashes along the bottom, create 50 divs with increasing margin-left, and an overall container with overflow:hidden.
对于底部有 50 个破折号的边框，创建 50 个 divmargin-left并带有overflow:hidden.
