This is an example of small multiples with bar charts. The bar chart is implemented with a single path, not rect SVG element.
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April 30, 2016 06:28
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Small multiples with path bar charts
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| svg { | |
| font: 10px sans-serif; | |
| padding: 10px; | |
| } | |
| .frame { | |
| shape-rendering: crispEdges; | |
| } | |
| .frame { | |
| fill: none; | |
| stroke: #aaa; | |
| stroke-opacity: 0.75; | |
| } | |
| .feature-cell { | |
| opacity: 0.6; | |
| } | |
| .feature-cell:hover { | |
| opacity: 1; | |
| } | |
| .feature-render { | |
| *fill: lightsteelblue; | |
| fill-opacity: 0.8; | |
| stroke-width: 0; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| size = 150, | |
| cw = 80, //cell width | |
| ch = 20, //cell hight | |
| padding = 4, | |
| nCol = 10; //Math.floor((width - padding) / size); | |
| var color = d3.scale.category20(); | |
| var x = d3.scale.linear() | |
| .range([padding / 2, cw - padding / 2]); | |
| var y = d3.scale.linear() | |
| .range([ch - padding / 2, padding / 2]); | |
| function generateData(nFeatures, mBins) { | |
| return d3.range(nFeatures).map(function(i) { | |
| return { | |
| "name": "feature" + i, | |
| "col": i % nCol, | |
| "row": Math.floor(i / nCol), | |
| "bins": d3.range(mBins).map(function(j) { | |
| return Math.random(); | |
| }) | |
| }; | |
| }); | |
| } | |
| var fdata = generateData(100, 12); | |
| //console.log("fdata", fdata); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", ch * (Math.floor(fdata.length / nCol) + 1) + padding) | |
| .append("g") | |
| .attr("transform", "translate(" + padding + "," + padding / 2 + ")"); | |
| var cell = svg.selectAll(".feature-cell") | |
| .data(fdata) | |
| .enter().append("g") | |
| .attr("class", "feature-cell") | |
| .attr("transform", function(d) { | |
| return "translate(" + d.col * cw + "," + d.row * ch + ")"; | |
| }) | |
| .each(featurePlot); | |
| function pathBar(bins) { | |
| var path = [], | |
| i = -1, | |
| n = bins.length, | |
| d, | |
| bw = ((cw - padding) / (n + 1)).toFixed(1); //bar width based on the # of bins and cell width; (n+1) is the calculation adjustment by considering the bar width (the last bar takes an extra bar width); | |
| while (++i < n) { | |
| d = bins[i]; | |
| path.push("M", x(i * n / (n + 1)), ",", y(0), "V", y(d), "h", bw, "V", y(0)); // | |
| // n/(n+1) is the calculation adjustment by considering the bar width (the last bar takes an extra bar width); | |
| // y(0) is actually at the bottom: ch - padding / 2 | |
| } | |
| return path.join(""); | |
| } | |
| function pathBar0(bins) { | |
| var path = [], | |
| i = -1, | |
| n = bins.length, | |
| d, | |
| bw = ((cw - padding) / (n + 1)).toFixed(1); //bar width based on the # of bins and cell width; (n+1) is the calculation adjustment by considering the bar width (the last bar takes an extra bar width); | |
| while (++i < n) { | |
| d = bins[i]; | |
| path.push("M", x(i * n / (n + 1)), ",", y(0), "V", y(0), "h", bw, "V", y(0)); // | |
| // n/(n+1) is the calculation adjustment by considering the bar width (the last bar takes an extra bar width); | |
| // y(0) is actually at the bottom: ch - padding / 2 | |
| } | |
| return path.join(""); | |
| } | |
| function featurePlot(f) { | |
| var _cell = d3.select(this); | |
| _cell.append("rect") | |
| .attr("class", "frame") | |
| .attr("x", padding / 2) | |
| .attr("y", padding / 2) | |
| .attr("width", cw - padding) | |
| .attr("height", ch - padding); | |
| x.domain([0, f.bins.length - 1]); | |
| y.domain([0, 1]); | |
| _cell.append("path") | |
| .datum(f.bins) | |
| .attr("class", "feature-render") | |
| .style("fill", function() { | |
| return color(f.name); | |
| }) | |
| //.style("stroke", function() {return color(f.name);}) | |
| .attr("d", pathBar0) | |
| .transition() | |
| .duration(750) | |
| .attr("d", pathBar); | |
| // _cell.append("path") | |
| // .datum(f.bins) | |
| // .attr("class", "feature-line") | |
| // .style("stroke", function() { | |
| // return color(f.name); | |
| // }) | |
| // .attr("d", fline); | |
| } | |
| d3.select(self.frameElement).style("height", ch * (Math.floor(fdata.length / nCol) + 1) + padding + 20 + "px"); | |
| </script> | |
| </body> | |
| </html> |
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