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Circles: transitions
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { | |
| margin:0; | |
| position:fixed; | |
| top:0; | |
| right:0; | |
| bottom:0; | |
| left:0; | |
| } | |
| svg { | |
| width: 800px; | |
| height: 600px; | |
| border: 1px solid gray; | |
| } | |
| circle { | |
| opacity: 0.5; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| let radius = 10; | |
| let duration = 1500; | |
| let width = 800; | |
| let height = 600; | |
| let svg = d3.select('body').append('svg'); | |
| let xScale = d3.scaleBand() | |
| .rangeRound([0, width]); | |
| let yScale = d3.scaleLinear() | |
| .range([height, 0]); | |
| let colorScale = d3.scaleOrdinal(d3.schemeCategory10); | |
| let years = 30; | |
| let data = []; | |
| let cities = ['Crookston', 'Duluth', 'GrandRapids', 'Morris', 'StPaul', 'Waseca']; | |
| let villages =['vi1', 'vi2', 'vi3', 'vi4', 'vi5', 'vi6', 'vi7', 'vi8']; | |
| function update(data, year) { | |
| let t = d3.transition().duration(1000) | |
| data = data.filter(d => d.date.getFullYear() === year) | |
| // console.log(data) | |
| let circles = svg.selectAll('circle') | |
| .data(data, d => d.key); | |
| circles.exit() | |
| .transition(t) | |
| .attr('r', 0) | |
| .remove(); | |
| circles.enter().append('circle') | |
| .attr('r', radius) | |
| // .attr('cy', d => yScale(d.yield)) | |
| .merge(circles) | |
| .attr('cx', d => xScale(d.site)) | |
| .attr('fill', d => colorScale(d.village)) | |
| .transition(t) | |
| .attr('cy', d => yScale(d.yield)) | |
| } | |
| while (years > 0) { | |
| cities.forEach(city => { | |
| villages.forEach(village => { | |
| data.push({ | |
| date : new Date(`${2000-years}-01-01`), | |
| yield : Math.round(70 * Math.random()) + 5, | |
| key : `${village}${city}`, | |
| site : city, | |
| village: village, | |
| }) | |
| }) | |
| }) | |
| --years | |
| } | |
| let xDomain = data.map(d => d.site) | |
| // console.log(xDomain) | |
| xScale.domain(xDomain) | |
| // console.log(xScale.domain()) | |
| // let yExtent = d3.extent(data, d => d.yield) | |
| let yMax = d3.max(data, d => d.yield) | |
| // console.log(yExtent) | |
| yScale.domain([0, yMax + 5]) | |
| let startYear = 1990; | |
| let index = 0; | |
| let numYears = 9; | |
| // de | |
| // setInterval(() => { | |
| update(data, startYear + (index % numYears)); | |
| // index += 1 | |
| // }, 1000) | |
| </script> | |
| </body> |
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