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Planetarium
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <style> | |
| .orbit { | |
| stroke : #000000; | |
| fill : none; | |
| } | |
| .planet { | |
| stroke : #000000; | |
| fill : #FFFFFF; | |
| } | |
| .sun { | |
| stroke : #000000; | |
| fill : #000000; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="planetarium"> | |
| </div> | |
| <script type="text/javascript"> | |
| var w = 800, h = 600; | |
| var t0 = Date.now(); | |
| var planets = [ | |
| { R: 300, r: 5, speed: 5, phi0: 90}, | |
| { R: 150, r: 10, speed: 2, phi0: 190} | |
| ]; | |
| var svg = d3.select("#planetarium").insert("svg") | |
| .attr("width", w).attr("height", h); | |
| svg.append("circle").attr("r", 20).attr("cx", w/2) | |
| .attr("cy", h/2).attr("class", "sun") | |
| var container = svg.append("g") | |
| .attr("transform", "translate(" + w/2 + "," + h/2 + ")") | |
| container.selectAll("g.planet").data(planets).enter().append("g") | |
| .attr("class", "planet").each(function(d, i) { | |
| d3.select(this).append("circle").attr("class", "orbit") | |
| .attr("r", d.R); | |
| d3.select(this).append("circle").attr("r", d.r).attr("cx",d.R) | |
| .attr("cy", 0).attr("class", "planet"); | |
| }); | |
| d3.timer(function() { | |
| var delta = (Date.now() - t0); | |
| svg.selectAll(".planet").attr("transform", function(d) { | |
| return "rotate(" + d.phi0 + delta * d.speed/200 + ")"; | |
| }); | |
| }); | |
| </script> | |
| </body> | |
| </html> | |
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Nice!