SVG标记不起作用 [英] SVG Marker does not work
问题描述
我在javascript中创建了一个标记，如下所示：
I created a marker in javascript, It looks like below:
var marker = document.createElementNS(SVG.ns, "marker");
marker.setAttribute("markerWidth", "3");
marker.setAttribute("markerHeight", "3");
marker.setAttribute("id", "mkrCircle");
marker.setAttribute("viewBox", "0 0 12 12");
marker.setAttribute("orient", "auto");
marker.setAttribute("stroke", "#000000");
marker.setAttribute("stroke-width", "2");
marker.setAttribute("fill", "#ffffff");
marker.setAttribute("refX", "12");
marker.setAttribute("refY", "6");
var mkrContent = document.createElementNS(SVG.ns, "circle");
mkrContent.setAttribute("r", "5");
mkrContent.setAttribute("cx", "6");
mkrContent.setAttribute("cy", "6");
marker.appendChild(mkrContent);
defs.appendChild(marker); // <-- defs is svg defs element
我用它作为路径：
<path marker-mid="url(#mkrCircle)" d="M0,0L100,100" stroke-width="3"></path>
但它根本没有出现在路径中，为什么？
谢谢提前
But it does not appear in the path at all, Why?
Thanks in advance
推荐答案
导致标记不起作用的原因有三个：
There are three reason causing marker to not work:
-
您没有为路径指定笔触颜色，因此它不会显示（标记也不会显示）。
You haven't specified a stroke colour for your path, so it won't show up (and neither will the markers).
当路径没有任何中点时，您已指定 marker-mid 标记。它只是一个单线段。尝试 d =M0,0L100,100,200,200添加中间点。
You have specified marker-mid markers when the path doesn't have any midpoints. It's just a single line segment. Try d="M0,0L100,100,200,200" to add a mid point.
最后你的<对于以（6,6）和半径5为中心的圆圈，code> markerWidth 和 markerHeight 太小（3x3）。尝试 markerWidth =12markerHeight =12。
Finally your markerWidth and markerHeight are too small (3x3) for the circle which is centred at (6,6) and radius 5. Try markerWidth="12" markerHeight="12".
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