Created
June 21, 2015 23:30
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Simple Binary Orbit
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .orbiter { | |
| fill: #000; | |
| } | |
| .center { | |
| fill: #CCC; | |
| } | |
| .orbit { | |
| fill: none; | |
| stroke: #888; | |
| } | |
| </style> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js" charset="utf-8"></script> | |
| <body> | |
| <script> | |
| var width = 960, | |
| height = 500, | |
| dot_r = 10, | |
| orbit_r = height/4, | |
| center = {x: width/2, | |
| y: height/2}; | |
| var dot_data = [ | |
| { theta: 0 }, | |
| { theta: Math.PI }]; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var dots = svg.selectAll(".orbiter") | |
| .data(dot_data) | |
| .enter().append("circle", true) | |
| .attr("cx", function(d){ return center.x + orbit_r*Math.cos(d.theta); }) | |
| .attr("cy", function(d){ return center.y + orbit_r*Math.sin(d.theta); }) | |
| .attr("r", dot_r); | |
| dots.classed("orbiter", true); | |
| svg.append("circle") | |
| .attr("cx", center.x) | |
| .attr("cy", center.y) | |
| .attr("r", dot_r/2) | |
| .classed("center", true); | |
| svg.append("circle") | |
| .attr("cx", center.x) | |
| .attr("cy", center.y) | |
| .attr("r", orbit_r) | |
| .classed("orbit", true); | |
| var inc = Math.PI/2000; | |
| var animate = function(elapsed){ | |
| dots.attr("cx", function(d) { return center.x + orbit_r*Math.cos(d.theta + inc*elapsed); }) | |
| .attr("cy", function(d) { return center.y + orbit_r*Math.sin(d.theta + inc*elapsed); }); | |
| }; | |
| d3.timer(animate); | |
| </script> |
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