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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