javascript 用 d3 绘制非连续线
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Drawing non-continuous lines with d3
提问by julio
I'm using d3.js to make a simple line graph. I want to know if there's a way to create "holes" in the graph, that is, if the line can be interrupted or cut when there is no data available.
我正在使用 d3.js 制作一个简单的折线图。我想知道是否有办法在图中创建“洞”，即在没有可用数据的情况下是否可以中断或切割线。
I'm looking into either delete the places I don't need from the domain, or setting the line weight to 0 in specific segments, but I can't find a way to do either of these.
我正在考虑从域中删除我不需要的位置，或者在特定段中将线宽设置为 0，但我找不到执行其中任何一个的方法。
Thanks for your help!
谢谢你的帮助！
回答by Josh
The D3 linegenerator has a built in function to do just this, line.defined. You can use this function to control where your line is defined and where it is not (like where you have missing data.) If you wanted to make your line undefined whenever the second value in the point array is a javascript NaN value, you could say:
D3线生成器有一个内置函数可以做到这一点，line.defined。您可以使用此函数来控制线的定义位置和不定义位置（例如丢失数据的位置。）如果您想让点数组中的第二个值是 javascript NaN 值时取消定义您的线，您可以说：
line.defined(function(d) { return !isNaN(d[1]); });
Hereis a good example of this in action.
这是一个很好的例子。
