See also the SVG version.
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October 17, 2023 02:42
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~ 20 000 Simultaneous Canvas Transitions
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="utf-8"> | |
<title>Canvas, Lots of Transitions</title> | |
<script src='https://d3js.org/d3.v4.min.js' type='text/javascript'></script> | |
</head> | |
<body> | |
<canvas width=960 height=500></canvas> | |
<script> | |
var width = 960; | |
var height = 500; | |
var data = d3.range(19200) | |
var canvas = d3.select("canvas") | |
var context = canvas.node().getContext("2d"); | |
var faux = d3.select(document.createElement("custom")); | |
var rects = faux.selectAll("rect") | |
.data(data) | |
.enter() | |
.append("rect") | |
.attr("width",4) | |
.attr("height",4) | |
.attr("x", function(d) { return d % (960/5) * 5; }) | |
.attr("y", function(d) { return Math.floor (d/(960/5)) * 5; }) | |
.attr("fill", "steelblue") | |
rects.transition() | |
.duration(3000) | |
.delay(function(d) { return d % (960/5) + Math.floor(d/(960/5) ) }) | |
.attr("x", function(d) { return 960 - d % (960/5) * 5; }) | |
.attr("y", function(d) { return 500 - Math.floor (d/(960/5)) * 5; }) | |
.attr("fill","lightgreen"); | |
// rendering function, called repeatedly: | |
function render() { | |
context.clearRect(0, 0, width, height); | |
faux.selectAll("rect").each(function() { | |
var sel = d3.select(this); | |
context.beginPath(); | |
context.fillStyle = sel.attr("fill"); | |
context.fillRect(sel.attr("x"),sel.attr("y"),4,4); | |
}) | |
window.requestAnimationFrame(render) | |
} | |
window.requestAnimationFrame(render) | |
</script> | |
</body> | |
</html> |
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