Just some random circles.
Click to make them disappear! Or add more!
Last active
December 9, 2015 22:48
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Circles
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| function randomCircleChart() { | |
| var margin = {top: 20, right: 20, bottom: 20, left: 20}, | |
| width = 960, | |
| height = 500, | |
| xValue = function(d) { return d.x; }, | |
| yValue = function(d) { return d.y; }, | |
| rValue = function(d) { return d.r; }, | |
| xScale = d3.scale.linear(), | |
| yScale = d3.scale.linear(), | |
| rScale = d3.scale.linear().range([5, 20]), | |
| color = function(i) { return 'steelblue'; }, | |
| parent; | |
| function chart(selection) { | |
| selection.each(function(data) { | |
| // update xScale | |
| xScale | |
| .domain([0, 1]) | |
| .range([0, width - margin.left - margin.right]); | |
| // update y-scale | |
| yScale | |
| .domain([0, 1]) | |
| .range([height - margin.top - margin.bottom - d3.max(rScale.range()), 0]); | |
| // update r-scale | |
| rScale | |
| .domain([0, 1]); | |
| var svg = d3.select(this).append('svg'); | |
| var g = svg.append('g'); | |
| // otherwise, create skeletal chart | |
| svg .attr('width', width) | |
| .attr('height', height); | |
| g.attr('transform', 'translate(' + [margin.left, margin.top ] + ')'); | |
| var circle = g.selectAll('circle') | |
| .data(data) | |
| .enter().append('circle') | |
| .call(updateSelection); | |
| parent = g; | |
| }); | |
| } | |
| function updateSelection(selection) { | |
| selection | |
| .attr('cx', function(d, i) { return xScale(xValue(d)); }) | |
| .attr('cy', function(d, i) { return yScale(yValue(d)); }) | |
| .attr('r', function(d, i) { return rScale(rValue(d)); }) | |
| .style('fill', function(d, i) { return color(i); }) | |
| .style('fill-opacity', 1.0) | |
| .on('click', function(d, i) { | |
| d3.select(this) | |
| .on('click', function() {}) | |
| .transition() | |
| .duration(1250) | |
| .style('fill-opacity', 0) | |
| .attr('r', function(d, i) { return rScale(rValue(d)) * 4; }) | |
| .remove(); | |
| }); | |
| } | |
| chart.addCircle = function(d) { | |
| var circle = parent.selectAll('circle'); | |
| var _ = circle.data(); | |
| _.push(d); | |
| circle.data(_); | |
| circle | |
| .data(_) | |
| .enter().append('circle') | |
| .call(updateSelection); | |
| }; | |
| chart.width = function(_) { | |
| if (!arguments.length) return width; | |
| width = _; | |
| return chart; | |
| }; | |
| chart.height = function(_) { | |
| if (!arguments.length) return height; | |
| height = _; | |
| return chart; | |
| }; | |
| chart.color = function(_) { | |
| if (!arguments.length) return color; | |
| color = _; | |
| return chart; | |
| }; | |
| return chart; | |
| } | |
| function randomCircle() { | |
| return {x: Math.random(), y: Math.random(), r: Math.random()}; | |
| } | |
| var chart = randomCircleChart() | |
| .color(d3.scale.category20()); | |
| d3.select('#circles') | |
| .datum([]) | |
| .call(chart); | |
| for (var i = 0; i < 15; i++) { | |
| chart.addCircle(randomCircle()); | |
| } | |
| d3.select('#add-random-circle') | |
| .on('click', function() { chart.addCircle(randomCircle()); }); |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style>/* CSS */</style> | |
| <body> | |
| <button id="add-random-circle">Add a circle!</button> | |
| <div id="circles"> | |
| </div> | |
| <script src="//d3js.org/d3.v3.js"></script> | |
| <script src="circles.js"></script> |
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