Trying to build simple time travel for data displayed via d3 (with Ramda for data generation); very much still a work in progres...
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d3.unconf() 2015 Block
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<!DOCTYPE html> | |
<head> | |
<meta charset="utf-8"> | |
<link type="text/css" rel="stylesheet" href="style.css"/> | |
</head> | |
<body> | |
<input id="time-slider" type="range" min="0" max="1" step="0.01" value="1"></input> | |
<div id="table-target"> | |
<table> | |
<thead> | |
<tr> | |
<th>Series</th> | |
<th>Value</th> | |
<th>Time</th> | |
</tr> | |
</thead> | |
<tbody id="data-table"></tbody> | |
</table> | |
</div> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.18.0/ramda.min.js"></script> | |
<script src="src.js"></script> | |
</body> | |
</html> |
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// construct keys, start and end time; currently using 1 hour as baseline | |
var keys = ["a", "b", "c", "d", "e"] | |
, now = new Date().valueOf() | |
, duration = 1000 * 60 * 60 | |
, start = now - duration | |
, end = now | |
, min = 1 | |
, max = 100 | |
, sample_count = 20 | |
; | |
// generate some data | |
var data = generateData(keys, sample_count, start, end, min, max); | |
// need the time range for the slider | |
var t = d3.scale.linear().domain([0, 1]).rangeRound([start, end]); | |
// start with the last known values | |
var cursor = R.map(R.last, data); | |
// draw the table | |
var $table = d3.select("#data-table"); | |
$table.selectAll("tr") | |
.data(cursor) | |
.enter().append("tr").selectAll("td") | |
.data(function(d) { return [d.series, d.value, d.iso_time]; }) | |
.enter().append("td") | |
.text(function(d) { return d; }); | |
// setup the range slider; update when the value changes | |
$slider = d3.select("#time-slider").on("input", function() { | |
updateTable($table, select(t(this.value), data)); | |
}); | |
// debugging table | |
var $debugging = d3.selectAll("div.series") | |
.data(data) | |
.enter().append("div").classed("series", true); | |
$debugging.append("h3").text(function(d) { return d[0].series; }); | |
$debugging.append("table") | |
.selectAll("tr") | |
.data(function(d) { return d; }) | |
.enter().append("tr") | |
.selectAll("td") | |
.data(function(d) { return [d.series, d.step, d.value, d.time, d.iso_time]; }) | |
.enter().append("td") | |
.text(function(d) { return d; }); | |
// update the table values | |
function updateTable($target, data) { | |
$target.selectAll("tr") | |
.data(data) | |
.selectAll("td") | |
.data(function(d) { return [d.series, d.value, d.iso_time]; }) | |
.text(function(d) { return d; }); | |
} | |
function select(time, data) { | |
// var predicate = R.compose(R.gte(time), R.prop("time")); | |
// return R.map(R.find(predicate), data); | |
// ugh | |
return R.map(function(d) { | |
return R.findLast(function(v) { | |
return v.time <= time; | |
})(d) || R.head(d); | |
})(data); | |
} | |
/** | |
* data generation | |
* | |
*/ | |
function generateData(keys, count, start, end, min, max) { | |
var generateFn = R.curry(generateDataForKey)(R.__, count, start, end, min, max); | |
return R.map(generateFn, keys); | |
} | |
/** | |
* generate data for a single key | |
*/ | |
function generateDataForKey(key, count, start, end, min, max) { | |
// setup ranges | |
var timeRange = d3.scale.linear().domain([0, 1]).rangeRound([start, end]) | |
, valueRange = d3.scale.linear().domain([0, 1]).rangeRound([min, max]) | |
; | |
// sample function | |
var sampleFn = R.curry(makeSample)(timeRange, valueRange, key); | |
// generate samples | |
return R.sortBy( | |
R.prop("time"), | |
R.map(sampleFn, R.range(0, count)) | |
); | |
} | |
/** | |
* generate a single random sample | |
*/ | |
function makeSample(timeRange, valueRange, key, step) { | |
var t = timeRange(Math.random()) | |
, isoTime = new Date(t).toISOString() | |
; | |
return { | |
series: key | |
, step: step | |
, time: t | |
, iso_time: isoTime | |
, value: valueRange(Math.random()) | |
}; | |
} |
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