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Last active November 24, 2021 01:40
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Moving xAxis along with line
(function() {
var n = 243,
duration = 750,
now = new Date( - duration),
count = 0,
data = d3.range(n).map(function() { return 0; });
var margin = {top: 6, right: 0, bottom: 20, left: 40},
width = 960 - margin.right,
height = 120 - - margin.bottom;
var x = d3.time.scale()
.domain([now - (n - 2) * duration, now - duration])
.range([0, width]);
var y = d3.scale.linear()
.range([height, 0]);
var line = d3.svg.line()
.x(function(d, i) { return x(now - (n - 1 - i) * duration); })
.y(function(d, i) { return y(d); });
var svg ="body").append("p").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + + margin.bottom)
.style("margin-left", -margin.left + "px")
.attr("transform", "translate(" + margin.left + "," + + ")");
.attr("id", "clip")
.attr("width", width)
.attr("height", height);
var axis = svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(x.axis = d3.svg.axis().scale(x).orient("bottom"));
var path = svg.append("g")
.attr("clip-path", "url(#clip)")
.attr("class", "line");
var transition ={}).transition()
.on("scroll", function() { ++count; });
(function tick() {
transition = transition.each(function() {
// 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.min(30, count));
count = 0;
// redraw the line".line")
.attr("d", line)
.attr("transform", null);
// slide the x-axis left;
// slide the line left
.attr("transform", "translate(" + x(now - (n - 1) * duration) + ")");
// pop the old data point off the front
}).transition().each("start", tick);
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bjorngi commented Dec 9, 2015

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Jaapze commented Feb 26, 2016

There is a error in your code, i fixed it here:
I don't know how i can do a pull request in gist, so that's why i did it in codepen ;)

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@Atticweb Try changing the line fill, in your code-pen example, you get some strange results.

Any ideas how to fix?

fill: #ff0;
stroke: #000;

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maslick commented Apr 27, 2017

doesn't work with v4 :(

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I forked the code pen from @Atticweb and updated to v4. Everything seems to be working properly, but I'm a little unhappy with the transition of the axis text, it doesn't respect the easing (jumpy), but the ticks transition smoothly. Any ideas?

I'm pretty new to d3, but wanted to use this same idea in a similar project that requires v4.

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Hey guys, thanks for the code.
I am trying to connect this to a webocket. I thought I'll start with random values coming through a timer:
setInterval(function(){ tick(); }, 500);
as a start . Instead of the method used in the example:

.transition().each("start", tick);

But I can't get to run smoothly: See:

Any idea what I am missing ? I've tried everything I could think of/find online.
Any help would be greatly appreciated !

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abitbetterthanyesterday commented Nov 24, 2021

For anyone out there wondering what the answer is about @daniel-cohen 's issue.

I think there is a default duration when using duration(), so your code 'updates' every X ms, hence the jumpy behaviour.

Simply replace your code by .transition().duration(1).each("start",tick) 🚀

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