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Scale Tutorial
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>D3 Graphic</title> | |
| <style> | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: black; | |
| shape-rendering: crispEdges; | |
| } | |
| .axis text { | |
| font-family: sans-serif; | |
| font-size: 11px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h2>Scale</h2> | |
| <div id="scale"></div> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <script src="script.js"></script> | |
| </body> | |
| </html> |
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| //Create SVG element | |
| var w = 600; | |
| var h = 400; | |
| var padding = 30; | |
| //Dynamic, random dataset | |
| var dataset = []; | |
| var numDataPoints = 20; | |
| var xRange = Math.random() * 1000; | |
| var yRange = Math.random() * 1000; | |
| for (var i = 0; i < numDataPoints; i++) { | |
| var newNumber1 = Math.round(Math.random() * xRange); | |
| var newNumber2 = Math.round(Math.random() * yRange); | |
| dataset.push([newNumber1, newNumber2]); | |
| } | |
| //Create scale functions | |
| var xScale = d3.scale.linear() | |
| .domain([0, d3.max(dataset, function(d) { return d[0]; })]) | |
| .range([padding, w -padding*2]); | |
| var yScale = d3.scale.linear() | |
| .domain([0, d3.max(dataset, function(d) { return d[1]; })]) | |
| .range([h - padding, padding]); | |
| var rScale = d3.scale.linear() | |
| .domain([0, d3.max(dataset, function(d) { return d[1]; })]) | |
| .range([2, 5]); | |
| var xAxis = d3.svg.axis() | |
| .scale(xScale) | |
| .orient("bottom") | |
| .ticks(5); //Set rough # of ticks | |
| //Define Y axis | |
| var yAxis = d3.svg.axis() | |
| .scale(yScale) | |
| .orient("left") | |
| .ticks(5); | |
| //Create SVG element | |
| var svg = d3.select('#scale').append('svg') | |
| .attr("width", w) | |
| .attr("height", h); | |
| //Create circles | |
| svg.selectAll("circle") | |
| .data(dataset) | |
| .enter() | |
| .append("circle") | |
| .attr("cx", function(d) { | |
| return xScale(d[0]); | |
| }) | |
| .attr("cy", function(d) { | |
| return yScale(d[1]); | |
| }) | |
| .attr("r", function(d) { | |
| return rScale(d[1]); | |
| }); | |
| //Create labels | |
| svg.selectAll("text") | |
| .data(dataset) | |
| .enter() | |
| .append("text") | |
| .text(function(d) { | |
| return d[0] + "," + d[1]; | |
| }) | |
| .attr("x", function(d) { | |
| return xScale(d[0]); | |
| }) | |
| .attr("y", function(d) { | |
| return yScale(d[1]); | |
| }) | |
| .attr("font-family", "sans-serif") | |
| .attr("font-size", "11px") | |
| .attr("fill", "red"); | |
| //Create X axis | |
| svg.append("g") | |
| .attr("class", "axis") | |
| .attr("transform", "translate(0," + (h - padding) + ")") | |
| .call(xAxis); | |
| //Create Y axis | |
| svg.append("g") | |
| .attr("class", "axis") | |
| .attr("transform", "translate(" + padding + ",0)") | |
| .call(yAxis); |
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