Created
April 10, 2018 22:09
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pulsing dots on an old d3 map ftw
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <link rel="stylesheet" href="styles.css" /> | |
| </head> | |
| <body> | |
| <div id="map"></div> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.1/d3.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3-queue/3.0.7/d3-queue.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/3.0.2/topojson.min.js"></script> | |
| <script src="scripts.js"></script> | |
| </body> | |
| </html> |
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| var d3_map = d3.select('#map'); | |
| var aspect = 960 / 500; | |
| var width = d3_map.node().getBoundingClientRect().width; | |
| var height = width / aspect; | |
| var projection = d3.geo.albersUsa() | |
| .scale(width) | |
| .translate([width/2, height/2]); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var svg = d3_map.append('svg') | |
| .attr('width', width) | |
| .attr('height', height); | |
| d3.queue() | |
| .defer(d3.json, 'us.json') | |
| .await(ready); | |
| function ready(error, us) { | |
| if (error) throw error; | |
| var dots = [ | |
| {'city': 'Colorado Springs, CO', 'lat': 38.875868, 'lng': -104.8984438} | |
| ] | |
| svg.insert('path', '.graticule') | |
| .datum(topojson.feature(us, us.objects.land)) | |
| .attr('class', 'land') | |
| .attr('d', path); | |
| // draw the state boundaries | |
| svg.insert('path', '.graticule') | |
| .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; })) | |
| .attr('class', 'state-boundary') | |
| .attr('d', path); | |
| // draw the map bubbles | |
| svg.selectAll('circle') | |
| .data(dots) | |
| .enter() | |
| .append('circle') | |
| .attr('cx', function (d) { return projection([d.lng, d.lat])[0]; }) | |
| .attr('cy', function (d) { return projection([d.lng, d.lat])[1]; }) | |
| .attr('class', 'dot') | |
| .attr('r', 7) | |
| .each(pulse); | |
| function pulse() { | |
| var circle = svg.selectAll('circle'); | |
| (function repeat() { | |
| circle = circle.transition() | |
| .duration(1000) | |
| .attr('r', 10) | |
| .ease('sine') | |
| .transition() | |
| .duration(1000) | |
| .attr('r', 7) | |
| .each('end', repeat); | |
| })(); | |
| } | |
| // https://davidwalsh.name/javascript-debounce-function | |
| function debounce(func, wait, immediate) { | |
| var timeout; | |
| return function() { | |
| var context = this, args = arguments; | |
| var later = function() { | |
| timeout = null; | |
| if (!immediate) func.apply(context, args); | |
| }; | |
| var callNow = immediate && !timeout; | |
| clearTimeout(timeout); | |
| timeout = setTimeout(later, wait); | |
| if (callNow) func.apply(context, args); | |
| }; | |
| } | |
| var resize = debounce(function() { | |
| var width = d3_map.node().getBoundingClientRect().width; | |
| var height = width / aspect; | |
| svg.attr('width', width) | |
| .attr('height', height); | |
| projection | |
| .scale(width) | |
| .translate([width / 2, height / 2]); | |
| d3.select('.state-boundary') | |
| .attr('d', path); | |
| d3.selectAll('.land') | |
| .attr('d', path); | |
| d3.selectAll('.dot') | |
| .attr('cx', function (d) { return projection([d.lng, d.lat])[0]; }) | |
| .attr('cy', function (d) { return projection([d.lng, d.lat])[1]; }); | |
| }, 250); | |
| window.addEventListener('resize', resize); | |
| } |
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| .land { | |
| fill: #fafafa; | |
| stroke: #bbb; | |
| } | |
| .state-boundary { | |
| fill: none; | |
| stroke: #bbb; | |
| stroke-linejoin: round; | |
| stroke-linecap: round; | |
| } | |
| .dot { | |
| fill: red; | |
| } |
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