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function viz19() {
var data = [],
lines,
line,
path,
circles,
circle,
areas,
tip = 0, // Highest Y point so far
max = 500 // Maximum length of data
var graph = function(s) {
if (s == undefined) {
console.error('selection is undefined.')
return
}
data = []
svg.append("defs")
.append("clipPath")
.attr("id", "clip")
.append("rect")
.attr('width', W)
.attr('height', H)
graph.render()
}
graph.datum = function(_) {
if (arguments.length == 0) return datum
datum = _
data.push(datum)
return graph
}
function sum_y1_up_to_i(data, d, i) {
var sum = 0
var n = d.id
var p = d.id > 0 ? d.id - 1 : d3.max(data, function(d) { return d.id })
for (let j=0; j<i; j++) {
if (data[j].id != p) continue
sum += data[j].y
}
return sum;
}
graph.max = function(x, y) {
return (x > y) ? x : y;
}
graph.transition = function(_) {
if (arguments.length == 0) return transition
transition = d3.transition().ease(d3.easeLinear).duration(_ * Math.random())
return graph
}
// Update SVG
graph.render = function() {
if (data.length <= 1) return
if (data.length > max) data.shift(data.length - max)
// Update time scale to zoom in the latest steps
xmin = new Date(d3.min(data, function(d) { return d.x })).getTime()
xmax = new Date(d3.max(data, function(d) { return d.x })).getTime()
xScale.domain([xmin, xmax]).nice()
// Keep all Y values in sight
tip = graph.max(tip, sum_y1_up_to_i(data, data[0], data.length))
yScale.domain([ d3.min(data, function(d) { return d.y }), tip ]).nice()
// Find how many players are in
var players = d3.set(data, function(d) { return d.id })
var update = svg.selectAll('g.player').data(players.values())
var enter = update.enter().append('g')
var exit = update.exit()
exit.attr('class', 'inactive player')
.transition(graph.transition).style('opacity', 0).remove()
update.attr('class', 'active player')
enter.attr('class', 'new player')
.attr('id', function(d) { return 'player-' + d[0] })
// Play each player
d3.timeout(function() {
players.each(graph.play)
}, 300)
}
// Update SVG for one player
graph.play = function(player_id) {
// Only take the first datum
var pdata = data.filter(function(d) { return d.id == player_id })
// Update transition duration
var t = graph.transition(timeout * (0.5 + Math.random() / 2))
// Current player group
var player_group = svg.select('g.player#player-' + player_id)
// Selection
var update = player_group.selectAll('path').data([pdata])
var enter = update.enter().append('path')
var exit = update.exit()
function max(x, y) {
if (x <= 0) x = 0
if (y <= 0) y = 0
return Math.max(x, y)
}
function min(x, y) {
if (x <= 0) x = 0
if (y <= 0) y = 0
return Math.min(x, y)
}
var area = d3.area()
.x(function(d, i) { return xScale(d.x) })
.y0(function(d, i) { return yScale(sum_y1_up_to_i(data, d, i)) })
.y1(function(d, i) { return yScale(d3.sum(data.slice(0, max(0, i)),
function(d) { return d.y })) })
.curve(d3.curveBasisOpen)
// UPDATE existing nodes
update
.attr('class', 'update')
.attr('data-move', function(d, i) { return d[i].n })
.attr('d', area)
// ENTER new nodes
enter
.attr('class', 'enter')
.attr('data-move', function(d, i) { return d[i].n })
.transition(t).duration(400)
.attr('d', area)
.attr('fill', function(d, i) { return color(d[i].id) })
// EXIT removed nodes
exit.style('fill', 'red').remove()
}
graph.run = function() {
graph.render()
d3.interval(graph.render, 50)
}
return graph
}
function randomInteger(min, max) {
return min + Math.floor(Math.random() * (max - min + 1))
}
function genDatum() {
if (halted) {
clearTimeout(gen)
console.log('genDatum: halted.')
return
}
// Pick a random timestamp within one second of now
var now = new Date(new Date().getTime() + (Math.random() - 0.5) * 1000)
var obj = {
n: n++,
id: randomInteger(1, 5),
x: now.getTime(),
y: d3.randomNormal(12, 3)()
}
// Append datum to data array
graph.datum(obj)
// Update delay to next object
timeout = Math.round(normal())
// TODO: Use d3.timeInterval
clearTimeout(gen)
gen = setTimeout(genDatum, timeout)
}
// Variables
var halted = false,
timeout = 1000,
now = new Date().getTime(),
n = 0,
gen = setTimeout(genDatum, timeout)
// Random delay for timeout
//var normal = d3.randomNormal(1000, 200)
var normal = d3.randomNormal(750, 200)
// Constants
const W = 1366, // SVG Width
H = 320, // SVG Height
R = 32, // Point Radius
D = 50 // Duration in ms
const color = d3.scaleOrdinal(d3.schemeCategory10)
const xScale = d3.scaleLinear().domain([0, 1]).range([W, 0])
const yScale = d3.scaleLinear().domain([0, 1]).range([H, 0])
const graph = viz19()
const view = d3.select('#view')
const svg = view.append('svg').attr('width', W).attr('height', H)
// Runtime
console.clear()
view.call(graph)
graph.run()
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