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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Sliding Windows Example</title> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="//cdnjs.cloudflare.com/ajax/libs/bacon.js/0.6.19/Bacon.js"></script> | |
| <style> | |
| .chart rect { | |
| fill: steelblue; | |
| stroke: white; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| // The d3 setup. Skip further down for the bacon-powered bit | |
| // http://mbostock.github.com/d3/tutorial/bar-2.html | |
| var d_len = 33, | |
| w = 20, | |
| h = 80; | |
| var x = d3.scale.linear() | |
| .domain([0, 1]) | |
| .range([0, w]); | |
| var y = d3.scale.linear() | |
| .domain([0, 100]) | |
| .rangeRound([0, h]); | |
| var chart = d3.select("body").append("svg") | |
| .attr("class", "chart") | |
| .attr("width", w * d_len - 1) | |
| .attr("height", h); | |
| chart.append("line") | |
| .attr("x1", 0) | |
| .attr("x2", w * d_len) | |
| .attr("y1", h - 0.5) | |
| .attr("y2", h - 0.5) | |
| .style("stroke", "#000"); | |
| function redraw(data) { | |
| var rect = chart.selectAll("rect") | |
| .data(data, function(d) { return d.time; }); | |
| rect.enter().insert("rect", "line") | |
| .attr("x", function(d, i) { return x(i + 1) - .5; }) | |
| .attr("y", function(d) { return h - y(d.value) - .5; }) | |
| .attr("width", w) | |
| .attr("height", function(d) { return y(d.value); }) | |
| .transition() | |
| .duration(1000) | |
| .attr("x", function(d, i) { return x(i) - .5; }); | |
| rect.transition() | |
| .duration(1000) | |
| .attr("x", function(d, i) { return x(i) - .5; }); | |
| rect.exit().transition() | |
| .duration(1000) | |
| .attr("x", function(d, i) { return x(i - 1) - .5; }) | |
| .remove(); | |
| } | |
| // The Bacon awesomeness | |
| var initial = { | |
| time: 1297110663, | |
| value: 70 | |
| } | |
| function walk(prev, rand) { | |
| return { | |
| time: prev.time + 1, | |
| value: ~~Math.max(10, Math.min(90, prev.value + 10 * (rand - .5))) | |
| }; | |
| } | |
| function rand() { | |
| return new Bacon.Next(Math.random()); | |
| } | |
| Bacon.interval(1500).map(Math.random).scan(initial, walk).slidingWindow(33).onValue(redraw); | |
| </script> | |
| </body> | |
| </html> |
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