Created
February 2, 2012 23:51
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Example of continuous function graphing in d3 (using axis() for axes and grid lines)
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>D3 - Line Chart - continuous function</title> | |
| <!-- script type="text/javascript" src="https://raw.github.com/jquery/sizzle/master/sizzle.js"></script --> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.min.js"></script> | |
| <script type="text/javascript" src="http://mbostock.github.com/d3/d3.time.min.js"></script> | |
| <style type="text/css"> | |
| body { | |
| font: 12px sans-serif; | |
| } | |
| .mouse_area { | |
| opacity: 0; | |
| } | |
| .guides { | |
| stroke-width: 1px; | |
| } | |
| .guides line { | |
| stroke: #BBF; | |
| shape-rendering: crispEdges; | |
| } | |
| .guides circle { | |
| fill: #BBF; | |
| stroke: #348; | |
| opacity: 0.2; | |
| } | |
| .rules line, .rules path { | |
| shape-rendering: crispEdges; | |
| stroke: #000; | |
| } | |
| .rules .tick { | |
| } | |
| .rules .minor { | |
| stroke: #BBB; | |
| } | |
| .rules .domain { | |
| fill: none; | |
| } | |
| .grid .tick { | |
| stroke: #CCC; | |
| } | |
| .series path { | |
| fill: none; | |
| stroke: #348; | |
| stroke-width: 3px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| var w = 760; | |
| var h = 400; | |
| var x = d3.scale.linear().domain([-5, 5]).range([0,w]); | |
| var y = d3.scale.linear().domain([ 0, 1]).range([h,0]); | |
| var pad = 50; | |
| var svg = d3.select("body") | |
| .append("svg:svg") | |
| .attr("height", h + pad) | |
| .attr("width", w + pad) | |
| var vis = svg.append("svg:g") | |
| .attr("transform", "translate(40,20)") | |
| var legend = d3.select("body").append("div") | |
| .classed("legend", true) | |
| var continuous = make_gaussian_func(-2, .7); | |
| make_rules(); | |
| chart_line(); | |
| make_mouseover_guides(); | |
| function make_gaussian_func(mu, sigma_squared) { | |
| // per: http://en.wikipedia.org/wiki/Gaussian_function | |
| // and: http://mathworld.wolfram.com/GaussianFunction.html | |
| var sqrt = Math.sqrt, pow = Math.pow, e = Math.E, pi = Math.PI; | |
| var sigma = sqrt(sigma_squared); | |
| var a = 1 / (sigma * sqrt(2 * pi)); | |
| return (function(xi) { | |
| return pow( a * e, - pow(xi - mu, 2) / (2 * pow(sigma, 2)) ) | |
| }); | |
| } | |
| function chart_line() { | |
| var g = vis.append("svg:g") | |
| .classed("series", true) | |
| g.append("svg:path") | |
| .attr("d", function(d) { return d3.svg.line()( | |
| x.ticks(100).map(function(xi) { | |
| return [ x(xi), y(continuous(xi)) ] | |
| }) | |
| )}) | |
| } | |
| function make_mouseover_guides() { | |
| var guides = vis.append("svg:g") | |
| .classed("guides", true) | |
| var y_guides = guides.append("svg:g") | |
| guides.append("svg:line") | |
| .attr("y1",h) | |
| y_guides.append("svg:circle") | |
| .attr("r",7) | |
| y_guides.append("svg:line") | |
| .attr("x1",-20) | |
| .attr("x2",+20) | |
| vis.append("svg:rect") | |
| .classed("mouse_area", true) | |
| .attr("width", w) | |
| .attr("height", h) | |
| .on("mousemove", update_legend_values) | |
| .on("mouseout", blank_legend_values) | |
| blank_legend_values(); | |
| var format_5f = d3.format(".5f"); | |
| function update_legend_values() { | |
| var xi = x.invert(d3.svg.mouse(this)[0]); | |
| legend | |
| .text("x: "+format_5f(xi)+ " | y: "+format_5f(continuous(xi))); | |
| guides | |
| .attr("transform", "translate("+(x(xi))+",0)") | |
| .attr("visibility", "visible") | |
| y_guides | |
| .attr("transform", "translate(0,"+y(continuous(xi))+")") | |
| } | |
| function blank_legend_values() { | |
| legend | |
| .text("Mouse over the graph...") | |
| guides | |
| .attr("visibility", "hidden") | |
| } | |
| } | |
| function make_rules() { | |
| var rules = vis.append("svg:g").classed("rules", true) | |
| function make_x_axis() { | |
| return d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom") | |
| .ticks(10) | |
| } | |
| function make_y_axis() { | |
| return d3.svg.axis() | |
| .scale(y) | |
| .orient("left") | |
| .ticks(10) | |
| } | |
| rules.append("svg:g").classed("grid x_grid", true) | |
| .attr("transform", "translate(0,"+h+")") | |
| .call(make_x_axis() | |
| .tickSize(-h,0,0) | |
| .tickFormat("") | |
| ) | |
| rules.append("svg:g").classed("grid y_grid", true) | |
| .call(make_y_axis() | |
| .tickSize(-w,0,0) | |
| .tickFormat("") | |
| ) | |
| rules.append("svg:g").classed("labels x_labels", true) | |
| .attr("transform", "translate(0,"+h+")") | |
| .call(make_x_axis() | |
| .tickSize(5) | |
| // .tickFormat(d3.time.format("%Y/%m")) | |
| ) | |
| rules.append("svg:g").classed("labels y_labels", true) | |
| .call(make_y_axis() | |
| .tickSubdivide(1) | |
| .tickSize(10, 5, 0) | |
| ) | |
| } | |
| </script> | |
| </body> | |
| </html> |
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