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/D3-REaltime-chart-.markdown

Created October 7, 2014 16:24
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A Pen by Secret Sam.
Raw
script.js
Array.prototype.max = function() {
return Math.max.apply(null, this);
};
Array.prototype.min = function() {
return Math.min.apply(null, this);
};
var n = 40,
random = d3.random.normal(0, .2),
data = d3.range(n).map(random);
var margin = {top: 20, right: 20, bottom: 20, left: 40},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var x = d3.scale.linear()
.domain([0, n - 1])
.range([0, width]);
var y = d3.scale.linear()
.domain([-1, 1])
.range([height, 0]);
var line = d3.svg.line()
.x(function(d, i) { return x(i); })
.y(function(d, i) { return y(d); });
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
svg.append("defs").append("clipPath")
.attr("id", "clip")
.append("rect")
.attr("width", width)
.attr("height", height);
var xAxisBase = svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + y(0) + ")");
xAxisBase.call(d3.svg.axis().scale(x).orient("bottom"));
var yAxisBase = svg.append("g")
.attr("class", "y axis");
yAxisBase.call(d3.svg.axis().scale(y).orient("left"));
var path = svg.append("g")
.attr("clip-path", "url(#clip)")
.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line);
tick();
function tick() {
// push a new data point onto the back
data.push(random() * 50 + 1);
// redraw the line, and slide it to the left
path
.attr("d", line)
.attr("transform", null)
.transition()
.duration(500)
.ease("linear")
.attr("transform", "translate(" + x(-1) + ",0)")
.each("end", tick);
x = d3.scale.linear()
.domain([0, n - 1])
.range([0, width]);
y = d3.scale.linear()
.domain([data.min(), data.max()])
.range([height, 0]);
xAxisBase.call(d3.svg.axis().scale(x).orient("bottom"))
yAxisBase.call(d3.svg.axis().scale(y).orient("left"));
// pop the old data point off the front
data.shift();
}
Raw
style.css
svg {
font: 10px sans-serif;
}
.line {
fill: none;
stroke: #000;
stroke-width: 1.5px;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
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