Learning to create a reusable chart function for a scatter plot, following Mike Bostock's "Towards Reusable Charts." Also includes a random data generator.
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August 29, 2015 13:57
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Reusable Scatter Plot Function
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <style> | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| #viz1 .points circle { | |
| fill: steelblue; | |
| fill-opacity: 0.6; | |
| stroke: black; | |
| } | |
| #viz2 .points circle { | |
| fill: orange; | |
| fill-opacity: 0.6; | |
| stroke: black; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="viz1"></div> | |
| <div id="viz2"></div> | |
| <script src="visualization.js"></script> | |
| </body> | |
| </html> |
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| function randomData(numPoints) { | |
| var data = []; | |
| random = function() {return Math.floor(Math.random() * 100);}; | |
| for (i = 0; i < numPoints; i++) { | |
| data.push({ | |
| x: random(), | |
| y: random(), | |
| z: random() | |
| }); | |
| } | |
| return data; | |
| } | |
| function scatterPlot() { | |
| var margin = {top: 10, right: 25, bottom: 25, left: 40}, | |
| width = 600, | |
| height = 400, | |
| xValue = function(d) { return d[0]; }, | |
| yValue = function(d) { return d[1]; }, | |
| sizeValue = function(d) { return d[2]; }, | |
| xScale = d3.scale.linear(), | |
| yScale = d3.scale.linear(), | |
| sizeScale = d3.scale.sqrt(), | |
| xAxis = d3.svg.axis().scale(xScale).orient("bottom").tickSize(6,1); | |
| yAxis = d3.svg.axis().scale(yScale).orient("left").tickSize(6, 1); | |
| function chart(selection) { | |
| selection.each(function(data) { | |
| // Convert data to standard representation greedily; | |
| // this is needed for nondeterministic accessors. | |
| data = data.map(function(d, i) { | |
| return [xValue.call(data, d, i), | |
| yValue.call(data, d, i), | |
| sizeValue.call(data, d, i)]; | |
| }); | |
| // Update the x-scale. | |
| xScale | |
| .domain(d3.extent(data, function(d) { return d[0]; })) | |
| .range([0, width - margin.left - margin.right]); | |
| // Update the y-scale. | |
| yScale | |
| .domain([0, d3.max(data, function(d) { return d[1]; })]) | |
| .range([height - margin.top - margin.bottom, 0]); | |
| // Update the size-scale. | |
| sizeScale | |
| .domain([d3.min(data, function(d) { return d[2]; }), | |
| d3.max(data, function(d) { return d[2]; })]) | |
| .range([2,8]); | |
| // Select the svg element, if it exists. | |
| var svg = d3.select(this).selectAll("svg").data([data]); | |
| // Otherwise, create the skeletal chart. | |
| var gEnter = svg.enter().append("svg").append("g"); | |
| gEnter.append("g").attr("class", "points"); | |
| gEnter.append("g").attr("class", "x axis"); | |
| gEnter.append("g").attr("class", "y axis"); | |
| // Update the outer dimensions. | |
| svg .attr("width", width) | |
| .attr("height", height); | |
| // Update the inner dimensions. | |
| var g = svg.select("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| // Update the points | |
| g.select("g.points") | |
| .selectAll("circles.point") | |
| .data(data) | |
| .enter() | |
| .append("circle") | |
| .attr("class", "point") | |
| .attr("r", function(d) { return sizeScale(d[2]); }) | |
| .attr("transform", function(d) { | |
| return "translate(" + xScale(d[0]) + "," + yScale(d[1]) + ")"; | |
| }); | |
| // Update the x-axis. | |
| g.select(".x.axis") | |
| .attr("transform", "translate(0," + yScale.range()[0] + ")") | |
| .call(xAxis); | |
| // Update the y-axis. | |
| g.select(".y.axis") | |
| .attr("transform", "translate(0," + xScale.range()[0] + ")") | |
| .call(yAxis); | |
| }); | |
| } | |
| // The x-accessor for the path generator; xScale ∘ xValue. | |
| function X(d) { | |
| return xScale(d[0]); | |
| } | |
| // The x-accessor for the path generator; yScale ∘ yValue. | |
| function Y(d) { | |
| return yScale(d[1]); | |
| } | |
| function size(d) { | |
| return sizeScale(d[2]); | |
| } | |
| chart.margin = function(_) { | |
| if (!arguments.length) return margin; | |
| margin = _; | |
| return chart; | |
| }; | |
| chart.width = function(_) { | |
| if (!arguments.length) return width; | |
| width = _; | |
| return chart; | |
| }; | |
| chart.height = function(_) { | |
| if (!arguments.length) return height; | |
| height = _; | |
| return chart; | |
| }; | |
| chart.x = function(_) { | |
| if (!arguments.length) return xValue; | |
| xValue = _; | |
| return chart; | |
| }; | |
| chart.y = function(_) { | |
| if (!arguments.length) return yValue; | |
| yValue = _; | |
| return chart; | |
| }; | |
| chart.size = function(_) { | |
| if (!arguments.length) return sizeValue; | |
| sizeValue = _; | |
| return chart; | |
| }; | |
| return chart; | |
| } | |
| var chart = scatterPlot() | |
| .x( function(d) { return +d.x; } ) | |
| .y( function(d) { return +d.y; } ) | |
| .size( function(d) { return +d.z; } ) | |
| .height(250); | |
| // Bind the data to the chart to the #viz elements | |
| chart1 = d3.select('#viz1').datum(randomData(50)).call(chart); | |
| chart2 = d3.select('#viz2').datum(randomData(50)).call(chart); | |
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Line #24 should end in a comma, this causes yAxis to be declared globally.