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@uicoded

uicoded/.block

Created February 2, 2018 22:04
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OMG Particles II
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.block
license: gpl-3.0
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README.md
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index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
margin: 0;
background: #111;
min-width: 960px;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
var width = Math.max(960, innerWidth),
height = Math.max(500, innerHeight);
var x1 = width / 2,
y1 = height / 2,
x0 = x1,
y0 = y1,
i = 0,
r = 200,
τ = 2 * Math.PI;
var canvas = d3.select("body").append("canvas")
.attr("width", width)
.attr("height", height)
.on("ontouchstart" in document ? "touchmove" : "mousemove", move);
var context = canvas.node().getContext("2d");
context.globalCompositeOperation = "lighter";
context.lineWidth = 2;
d3.timer(function() {
context.clearRect(0, 0, width, height);
var z = d3.hsl(++i % 360, 1, .5).rgb(),
c = "rgba(" + z.r + "," + z.g + "," + z.b + ",",
x = x0 += (x1 - x0) * .1,
y = y0 += (y1 - y0) * .1;
d3.select({}).transition()
.duration(2000)
.ease(Math.sqrt)
.tween("circle", function() {
return function(t) {
context.strokeStyle = c + (1 - t) + ")";
context.beginPath();
context.arc(x, y, r * t, 0, τ);
context.stroke();
};
});
});
function move() {
var mouse = d3.mouse(this);
x1 = mouse[0];
y1 = mouse[1];
d3.event.preventDefault();
}
</script>
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