Created
September 10, 2012 14:51
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testing d3.js brush
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .brush .extent { | |
| stroke: gray; | |
| fill: blue; | |
| fill-opacity: .165; | |
| } | |
| </style> | |
| <body> | |
| <script type="text/javascript" src="http://d3js.org/d3.v2.js"></script> | |
| <script> | |
| var data = new Array(200); | |
| for (i=0; i<data.length; i++) data[i] = Math.random() > 0.5 ? "Orange" : "Cyan"; | |
| var width = 800, | |
| height = 300; | |
| var svg = d3.select("body").append("svg:svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| bar = function(range) { | |
| var x_range = d3.scale.linear() | |
| .domain([0, range.length]) | |
| .range([0, width]); | |
| svg.selectAll("rect.items").remove(); | |
| svg.selectAll("rect.items") | |
| .data(range) | |
| .enter().append("svg:rect") | |
| .attr("class", "items") | |
| .attr("x", function(d, i) {return x_range(i);}) | |
| .attr("y", 0) | |
| .attr("width", width/range.length-2) | |
| .attr("height", 100) | |
| .attr("fill", function(d) {return d}) | |
| .attr("title", function(d) {return d}); | |
| } | |
| var start = 21; | |
| bar(data.slice(0, start), true); | |
| var control_x_range = d3.scale.linear() | |
| .domain([0, data.length]) | |
| .range([0, width]); | |
| controlBar = svg.selectAll("rect.itemsControl") | |
| .data(data) | |
| .enter().append("svg:rect") | |
| .attr("class", "itemsControl") | |
| .attr("x", function(d, i) {return control_x_range(i);}) | |
| .attr("y", 110) | |
| .attr("width", width/data.length-2) | |
| .attr("height", 20) | |
| .attr("fill", function(d) {return d}); | |
| svg.append("g") | |
| .attr("class", "brush") | |
| .call(d3.svg.brush().x(d3.scale.linear().range([0, width])) | |
| .extent([0,1*start/data.length]) | |
| .on("brush", brush)) | |
| .selectAll("rect") | |
| .attr("y", 110) | |
| .attr("height", 20); | |
| function brush() { | |
| var s = d3.event.target.extent(); | |
| if (s[1]-s[0] < 0.5) { | |
| var start = Math.round((data.length-1)*s[0]); | |
| var end = Math.round((data.length-1)*s[1]); | |
| bar(data.slice(start,end)); | |
| } | |
| else {d3.event.target.extent([s[0],s[0]+0.5]); d3.event.target(d3.select(this));} | |
| } | |
| </script> |
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