使用nvd3.js的实时线图 [英] Real time line graph with nvd3.js
问题描述
我正在尝试使用nvd3.js创建一个实时图表,它会定期更新并给出数据被实时处理的印象。
I am trying to create a real time graph using nvd3.js which would be updated periodically and with the impression that the data is processed in real time.
现在,我已经能够创建一个函数来定期更新图形,但是我不能在状态之间平滑过渡,比如执行转换往左边。
For now I have been able to create a function which would update the graph periodically but I cannot manage to have a smooth transition between "states" like the line doing a transition to the left.
这里是我使用nvd3.js做的,这里有趣的代码是:
Here is what I did using nvd3.js , here the interesting code is:
d3.select('#chart svg')
.datum(data)
.transition().duration(duration)
.call(chart);
现在,我已经能够使用d3.js生成我想要的,但我更喜欢能够使用nvd3.js.提供的所有工具。 这里是我想使用nvd3生成
Now, I have been able to produce what I want using d3.js but I would prefer to be able to use all the tools provided by nvd3.js. Here is what I would like to produce using nvd3
使用d3.js转换的有趣代码是:
The interesting code for the transition using d3.js is:
function tick() {
// update the domains
now = new Date();
x.domain([now - (n - 2) * duration, now - duration]);
y.domain([0, d3.max(data)]);
// push the accumulated count onto the back, and reset the count
data.push(Math.random()*10);
count = 0;
// redraw the line
svg.select(".line")
.attr("d", line)
.attr("transform", null);
// slide the x-axis left
axis.transition()
.duration(duration)
.ease("linear")
.call(x.axis);
// slide the line left
path.transition()
.duration(duration)
.ease("linear")
.attr("transform", "translate(" + x(now - (n - 1) * duration) + ")")
.each("end", tick);
// pop the old data point off the front
data.shift();
}
推荐答案
想看看:
D3实时流图(图形数据可视化),
尤其是答案的链接:
http://bost.ocks.org/mike/path/
一般来说,我看到两种处理方式与垂直过渡问题:
In general, I see two ways to deal with the vertical transition problem:
- 过度采样在实际点之间具有一些线性插值,点之间的间隔越小, 垂直过渡将看起来(但缺点是你得到很多假点,这可能是不可接受的取决于图表的使用)
- 通过添加在最后,翻译左侧的图表,确保仍然可用的左侧部分不显示,直到你删除它(剪辑它或做任何其他伎俩),这是最好的,上述解决方案
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