Transition hacking by overwriting Date.now
, tricking d3.timer
into thinking it's whatever time we want. Beyond the obvious red flags of overwriting a browser global, this only really works for moving forward (each transition in a chain self-deletes once it hits t=1
). I would not recommend this.
Last active
July 3, 2016 10:36
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Transitioning hacking with clock manipulation
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
body { | |
text-align: center; | |
font: 16px sans-serif; | |
} | |
button { | |
margin: 0 0.5em; | |
} | |
circle { | |
stroke: #000; | |
stroke-width: 1.5px; | |
} | |
</style> | |
<body> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.16/d3.min.js"></script> | |
<script> | |
var margin = {top: 100, right: 100, bottom: 100, left: 100}, | |
width = 960 - margin.left - margin.right, | |
height = 440 - margin.top - margin.bottom; | |
var x = d3.scale.ordinal() | |
.domain(d3.range(5)) | |
.rangePoints([0, width]); | |
var y = x.copy() | |
.rangePoints([0, height]); | |
var color = d3.scale.linear() | |
.domain(d3.extent(x.domain())) | |
.range(["hsl(297,50%,47%)", "hsl(81,78%,61%)"]) | |
.interpolate(d3.interpolateHcl); | |
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 + ")"); | |
var dots = svg.selectAll("circle") | |
.data(x.domain()) | |
.enter() | |
.append("circle") | |
.attr("r",20) | |
.attr("cx",0) | |
.attr("cy",y) | |
.style("fill",color); | |
var curTime = 0, | |
_now = Date.now; // save for later | |
// FREEZE TIME | |
Date.now = function fakeNow(){ | |
return curTime; | |
}; | |
// Create a transition | |
dots.transition() | |
.duration(3500) | |
.delay(function(d){ | |
return d * 125; | |
}) | |
.attr("cx",x) | |
.attr("r",40) | |
.transition() | |
.duration(2000) | |
.attr("r",20) | |
.attr("cx",width); | |
d3.select("body").append("div") | |
.text("Jump to: ") | |
.selectAll("button") | |
.data(d3.range(0,6500,500)) | |
.enter() | |
.append("button") | |
.text(function(d){ | |
return (Math.round(d/100)/10) + " s"; | |
}) | |
.on("click",function(d){ | |
curTime = d; // TIME TRAVEL | |
}); | |
d3.select("div").append("button") | |
.text("Finish") | |
.style("font-weight","bold") | |
.on("click",function(){ | |
d3.selectAll("button").attr("disabled",true).on("click",null); | |
var now = _now(); | |
d3.timer(function(){ | |
var t = _now(); | |
curTime += (t - now); | |
now = t; | |
if (curTime >= 6000) { | |
// Transitions are all done | |
// Restore REAL TIME | |
Date.now = _now; | |
d3.select("div").remove(); | |
return true; | |
} | |
},0,0); | |
}); | |
</script> |
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