Changed the Spinny Lines block to never stop.
Last active
June 6, 2016 15:48
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Infinite Relaxing Spinny Lines
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
body { | |
background: #222 | |
} | |
</style> | |
<body> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script> | |
var width = 960, | |
height = 500, | |
then = Date.now(); | |
var svg = d3.select("body") | |
.append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
var lineFunction = d3.svg.line() | |
.x(function(d) { return d.x; }) | |
.y(function(d) { return d.y; }) | |
.interpolate("linear"); | |
var sphere_radius = .4 * height, | |
sphere_center = {"x": width/2, "y": height/2}; | |
function x_proj(theta, phi) { | |
return sphere_center.x + sphere_radius * Math.sin(theta) * Math.cos(phi); | |
} | |
function y_proj(theta) { | |
return sphere_center.y + sphere_radius * Math.cos(theta); | |
} | |
function depth_proj(theta, phi) { | |
return 1 + 0.5 * Math.sin(theta) * Math.sin(phi); | |
} | |
function create_path(timesteps) { | |
var path = []; | |
/* Get initial parameters */ | |
var theta_init = Math.PI * Math.random(), | |
phi_init = 2 * Math.PI * Math.random(), | |
v_theta = 0.002 * Math.random() + 0.002, | |
v_phi = 0.05 * Math.random() + 0.05, | |
theta = 0, | |
phi = 0, | |
tilt = Math.PI / 8 + Math.PI/ 5 * Math.random(); | |
/* Calculate path */ | |
for (t = 0; t < timesteps; t++) { | |
phi = v_phi * t; | |
theta = tilt * Math.sin(phi - phi_init) + v_theta * t; | |
path.push({"x" : x_proj(theta_init + theta, phi_init + phi), | |
"y" : y_proj(theta_init + theta)}); | |
} | |
return path; | |
} | |
function draw_path(path_data, color) { | |
var circular_path = svg.append("path") | |
.attr("d", lineFunction(path_data) ) | |
.attr("stroke", color) | |
.attr("stroke-width", 4) | |
.attr("stroke-opacity", 0.5) | |
.attr("fill", "none"); | |
var path_length = circular_path.node().getTotalLength(); | |
circular_path.attr("stroke-dasharray", path_length + " " + path_length) | |
.attr("stroke-dashoffset", path_length) | |
.transition() | |
.duration(10000) | |
.ease("circleout") | |
.attr("stroke-dashoffset", 0) | |
.attr("stroke-opacity", 0) | |
.remove(); | |
} | |
function draw_many_paths(num_paths) { | |
for (i = 0; i < num_paths; i++) { | |
var colour = d3.hsl(Math.floor(360 * Math.random()), 1, .5); | |
draw_path(create_path(700), colour); | |
} | |
} | |
draw_many_paths(10); | |
d3.timer(function() { | |
var time = Date.now() - then; | |
if (time > 1000) { | |
draw_many_paths(3); | |
then = Date.now(); | |
} | |
}) | |
</script> |
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