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Wave Motion
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .orbit { | |
| fill: none; | |
| stroke: #999; | |
| stroke-width: 1px; | |
| } | |
| </style> | |
| <svg width="960" height="500"></svg> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| var radius = 24, | |
| separation = 1.1 * radius; | |
| var index = cross( | |
| d3.range(0, (width + radius) / separation), | |
| d3.range(0, (height + radius) / separation) | |
| ); | |
| svg.append("g") | |
| .attr("class", "orbit") | |
| .selectAll("g") | |
| .data(index) | |
| .enter().append("circle") | |
| .attr("transform", function(d) { return "translate(" + d[0] * separation + "," + d[1] * separation + ")"; }) | |
| .attr("r", radius); | |
| var particle = svg.append("g") | |
| .attr("class", "particle") | |
| .selectAll("g") | |
| .data(index) | |
| .enter().append("circle") | |
| .attr("cx", radius) | |
| .attr("r", 3.5); | |
| d3.timer(function(elapsed) { | |
| particle.attr("transform", function(d) { | |
| return "translate(" + (d[0] * separation) + "," + d[1] * separation + ")rotate(" + ((d[0] + d[1]) * 20 + elapsed / 6) + ")"; | |
| }); | |
| }); | |
| function cross(x, y) { | |
| var n = x.length, | |
| m = y.length, | |
| z = new Array(n * m); | |
| for (var i = 0, k = 0; i < n; ++i) { | |
| for (var j = 0; j < m; ++j, ++k) { | |
| z[k] = [x[i], y[j]]; | |
| } | |
| } | |
| return z; | |
| } | |
| </script> |
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