This is tweaked code building upon the examples given by Scott Murray @alignedleft
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September 20, 2015 16:12
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Simple scatter transition
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <title>D3: Scatterplot!</title> | |
| <script type="text/javascript" src="d3.js"></script> | |
| <style type="text/css"> | |
| body { | |
| background-color: #ccc; | |
| } | |
| .buttonContainer { | |
| margin: 10px; | |
| } | |
| svg { | |
| background-color: white; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: black; | |
| shape-rendering: crispEdges; | |
| } | |
| .axis text { | |
| font-family: sans-serif; | |
| font-size: 11px; | |
| } | |
| circle.special { | |
| stroke: black; | |
| stroke-width: 5; | |
| fill: white; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="buttonContainer"> | |
| <input type="button" value="Randomize"> | |
| </div> | |
| <script type="text/javascript"> | |
| //Width and height | |
| var w = 500; | |
| var h = 300; | |
| var padding = 40; | |
| //Dynamic, random dataset | |
| var dataset = []; //Initialize empty array | |
| var numDataPoints = 50; //Number of dummy data points to create | |
| var maxRange = Math.random() * 1000; //Max range of new values | |
| for (var i = 0; i < numDataPoints; i++) { //Loop numDataPoints times | |
| var newNumber1 = Math.floor(Math.random() * maxRange); //New random integer | |
| var newNumber2 = Math.floor(Math.random() * maxRange); //New random integer | |
| dataset.push([newNumber1, newNumber2]); //Add new number to array | |
| } | |
| //Create scale functions | |
| var xScale = d3.scale.linear() | |
| .domain([0, d3.max(dataset, function(d) { return d[0]; })]) | |
| .range([padding, w - padding]); | |
| var yScale = d3.scale.linear() | |
| .domain([0, d3.max(dataset, function(d) { return d[1]; })]) | |
| .range([h - padding, padding]); | |
| //Define X axis | |
| var xAxis = d3.svg.axis() | |
| .scale(xScale) | |
| .orient("bottom") | |
| .ticks(5); | |
| //Define Y axis | |
| var yAxis = d3.svg.axis() | |
| .scale(yScale) | |
| .orient("left") | |
| .ticks(5); | |
| //Create SVG element | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", w) | |
| .attr("height", h); | |
| //Create circles | |
| svg.append("g") | |
| .attr("id", "circles") | |
| .selectAll("circle") | |
| .data(dataset) | |
| .enter() | |
| .append("circle") | |
| // .attr("class", "special") | |
| .classed("special", function(d,i){ | |
| if(i==0) {return true;} | |
| else {return false;} | |
| }) | |
| .attr("cx", function(d) { | |
| return xScale(d[0]); | |
| }) | |
| .attr("cy", function(d) { | |
| return yScale(d[1]); | |
| }) | |
| .attr("r", 4) | |
| .attr("fill", function(d) { | |
| if(xScale(d[0]) < w/2) | |
| return "#0043ff" | |
| else { return "#FF0000"} | |
| } | |
| ); | |
| //Create X axis | |
| svg.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + (h - padding + 5) + ")") | |
| .call(xAxis); | |
| //Create Y axis | |
| svg.append("g") | |
| .attr("class", "y axis") | |
| .attr("transform", "translate(" + (padding - 5) + ",0)") | |
| .call(yAxis); | |
| //On click, update with new data | |
| d3.select("input") | |
| .on("click", function() { | |
| //New values for dataset | |
| var numValues = dataset.length; //Count original length of dataset | |
| var maxRange = Math.random() * 1000; //Max range of new values | |
| dataset = []; //Initialize empty array | |
| for (var i = 0; i < numValues; i++) { //Loop numValues times | |
| var newNumber1 = Math.floor(Math.random() * maxRange); //New random integer | |
| var newNumber2 = Math.floor(Math.random() * maxRange); //New random integer | |
| dataset.push([newNumber1, newNumber2]); //Add new number to array | |
| } | |
| //Update scale domains | |
| xScale.domain([0, d3.max(dataset, function(d) { return d[0]; })]); | |
| yScale.domain([0, d3.max(dataset, function(d) { return d[1]; })]); | |
| //Update all circles | |
| svg.selectAll("circle") | |
| .data(dataset) | |
| .transition() | |
| .duration(2000) | |
| .attr("cx", function(d) { | |
| return xScale(d[0]); | |
| }) | |
| .attr("cy", function(d) { | |
| return yScale(d[1]); | |
| }) | |
| .attr("fill", function(d) { | |
| if(xScale(d[0]) < w/2) | |
| return "#0043ff" | |
| else { return "#FF0000"} | |
| }) | |
| ; | |
| //Update X axis | |
| svg.select(".x.axis") | |
| .transition() | |
| .duration(2000) | |
| .call(xAxis); | |
| //Update Y axis | |
| svg.select(".y.axis") | |
| .transition() | |
| .duration(2000) | |
| .call(yAxis); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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