Random circles are added to a GeoJSON FeatureCollection and rendered to canvas. The projection is rotated on each animation frame.
Last active
August 2, 2017 09:18
-
-
Save animateddata/6c49a7b6aab6cd615fe226a1938d6ea3 to your computer and use it in GitHub Desktop.
Ball of circles
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <head> | |
| <title>Ball of circles</title> | |
| </head> | |
| <style> | |
| body { | |
| background-color: #39474F; | |
| } | |
| </style> | |
| <body> | |
| <canvas id="content"></canvas> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js"></script> | |
| <script> | |
| var context = document.getElementById('content').getContext('2d'); | |
| var width = window.innerWidth; | |
| var height = window.innerHeight; | |
| var size = d3.min([width, height]); | |
| d3.select('#content') | |
| .attr('width', width + 'px') | |
| .attr('height', height + 'px'); | |
| context.lineWidth = 0.6; | |
| context.strokeStyle = 'rgba(255, 255, 255, 0.6)'; | |
| var projection = d3.geoOrthographic() | |
| .scale(0.45 * size) | |
| .translate([0.5 * width, 0.5 * height]); | |
| var geoGenerator = d3.geoPath() | |
| .projection(projection) | |
| .context(context); | |
| var circle = d3.geoCircle(); | |
| var geojson = {type: 'FeatureCollection', features: []}; | |
| function rndLon() {return -180 + Math.random() * 360;} | |
| function rndLat() {return -90 + Math.random() * 180;} | |
| function addCircle() { | |
| circle | |
| .center([rndLon(), rndLat()]) | |
| .radius(Math.random() * 8); | |
| geojson.features.push({ | |
| type: 'Feature', | |
| geometry: circle() | |
| }); | |
| } | |
| function update(t) { | |
| if(geojson.features.length < 1000) | |
| addCircle(); | |
| projection.rotate([t / 1000]); | |
| context.clearRect(0, 0, width, height); | |
| context.beginPath(); | |
| geoGenerator(geojson); | |
| context.stroke(); | |
| window.requestAnimationFrame(update); | |
| } | |
| window.requestAnimationFrame(update); | |
| </script> | |
| </body> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment