A little experiment to see if animating >500 SVG path elements really puts us in the "middle of screwed-up country" as Dominikus Baur puts it in his excellent write-up about the OECD Better Life Index HTML5 implementation.
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December 20, 2015 21:48
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Animating Flowers
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<body> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<script src="http://lab.interactivethings.com/lib/d3-grid.js"></script> | |
<script> | |
var width = 960, | |
height = 500, | |
petals = 12, | |
halfRadius = 15; | |
var size = d3.scale.sqrt() | |
.domain([0, 1]) | |
.range([0, halfRadius]); | |
var grid = d3.layout.grid() | |
.size([width - halfRadius * 6, height - halfRadius * 6]); | |
var pie = d3.layout.pie() | |
.sort(null) | |
.value(function(d) { return d.size; }); | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height) | |
.append("g") | |
.attr("transform", "translate(" + halfRadius * 3 + "," + halfRadius * 3 + ")"); | |
var data = d3.range(49).map(function(d) { | |
return { | |
id: d, | |
petals: d3.range(petals).map(function(d) { return {size: 0.5}; }) | |
} | |
}); | |
var flower = svg.selectAll('.flower') | |
.data(grid(data)) | |
.enter().append('g') | |
.attr("class", "flower") | |
.attr("transform", function(d, i) { | |
return "translate(" + d.x + "," + d.y + ")"; | |
}); | |
var petal = flower.selectAll(".petal") | |
.data(function(d) { return pie(d.petals); }) | |
.enter().append("path") | |
.attr("class", "petal") | |
.attr("transform", function(d) { return r((d.startAngle + d.endAngle) / 2); }) | |
.attr("d", petalPath) | |
.style("stroke", petalStroke) | |
.style("fill", petalFill); | |
setInterval(update, 4000) | |
function update() { | |
data.forEach(function(flower) { | |
flower.petals.forEach(function(d) { d.size = Math.random(); }); | |
}) | |
data.sort(function(a, b) { | |
return d3.descending(flowerSum(a), flowerSum(b)); | |
}); | |
flower.data(grid(data), function(d) { return d.id; }).transition().delay(function(d, i) { return 1000 + i * 20; }).duration(1000) | |
.attr("transform", function(d, i) { | |
return "translate(" + d.x + "," + d.y + ")"; | |
}); | |
petal.data(function(d) { return pie(d.petals); }).transition().duration(1000) | |
.attr("transform", function(d) { return r((d.startAngle + d.endAngle) / 2); }) | |
.attr("d", petalPath); | |
} | |
function petalPath(d) { | |
var angle = (d.endAngle - d.startAngle) / 2, | |
s = polarToCartesian(-angle, halfRadius), | |
e = polarToCartesian(angle, halfRadius), | |
r = size(d.data.size), | |
m = {x: halfRadius + r, y: 0}, | |
c1 = {x: halfRadius + r / 2, y: s.y}, | |
c2 = {x: halfRadius + r / 2, y: e.y}; | |
return "M0,0L" + s.x + "," + s.y + "Q" + c1.x + "," + c1.y + " " + m.x + "," + m.y + "L" + m.x + "," + m.y + "Q" + c2.x + "," + c2.y + " " + e.x + "," + e.y + "Z"; | |
}; | |
function petalFill(d, i) { | |
return d3.hcl(i / petals * 360, 60, 70); | |
}; | |
function petalStroke(d, i) { | |
return d3.hcl(i / petals * 360, 60, 40); | |
}; | |
function flowerSum(d) { | |
return d3.sum(d.petals, function(d) { return d.size; }); | |
} | |
function r(angle) { | |
return "rotate(" + (angle / Math.PI * 180) + ")"; | |
} | |
function polarToCartesian(angle, radius) { | |
return { | |
x: Math.cos(angle) * radius, | |
y: Math.sin(angle) * radius | |
}; | |
}; | |
</script> |
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