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Rain drop -Japan-
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| if(!d3.geo2circle) d3.geo2circle = function(coordinates, radius) { | |
| //circle 生成用の変数 | |
| var circle = [], | |
| length = 0, | |
| lengths = [length], | |
| polygon = d3.geom.polygon(coordinates), | |
| p0 = coordinates[0], | |
| p1, | |
| x, | |
| y, | |
| i = 0, | |
| n = coordinates.length; | |
| // coordinatesの前後間の距離を求める | |
| while (++i < n) { | |
| p1 = coordinates[i]; | |
| //console.log(p1); | |
| x = p1[0] - p0[0]; | |
| y = p1[1] - p0[1]; | |
| lengths.push(length += Math.sqrt(x * x + y * y)); | |
| p0 = p1; | |
| } | |
| var area = polygon.area(), | |
| radius = (radius) ? radius : Math.sqrt(Math.abs(area) / Math.PI), | |
| centroid = polygon.centroid(-1 / (6 * area)), | |
| angle, | |
| i = -1, | |
| k = 2 * Math.PI / lengths[lengths.length - 1]; | |
| // 三角関数による円の描画 | |
| while (++i < n) { | |
| angle = lengths[i] * k; | |
| circle.push([ | |
| centroid[0] + radius * Math.cos(angle), | |
| centroid[1] + radius * Math.sin(angle) | |
| ]); | |
| } | |
| return circle; | |
| }; |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>Rain drop -Japan-</title> | |
| <style> | |
| html, body, svg { | |
| width:100%; | |
| height:100%; | |
| margin: 0px; | |
| padding: 0px; | |
| } | |
| </style> | |
| <body> | |
| <svg> | |
| </svg> | |
| <br> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.3/d3.min.js"></script> | |
| <script src="d3.geo2circle.js"></script> | |
| <script> | |
| var projection = d3.geo | |
| .mercator() | |
| .scale(1500) | |
| .translate([500 , 350]) | |
| .center([139.0032936, 36.3219088]); | |
| var path = d3.geo.path().projection(projection); | |
| d3.json('todofuken.geojson', function(json) { | |
| var svg = d3.select('svg') | |
| var calcCoords = function(polygon, properties) { | |
| var geoCoords = polygon.map(projection); | |
| var scatterCoords = d3.geo2circle(geoCoords, 6); | |
| var scatterPathString = 'M' + scatterCoords.join('L') + 'Z'; | |
| var geoPathString = 'M' + geoCoords.join('L') + 'Z'; | |
| return { scatterPath: scatterPathString, geoPath: geoPathString , properties:properties}; | |
| }; | |
| var pathDataSet = []; | |
| for (var i = 0; i < json.features.length; i++) { | |
| var geometry = json.features[i].geometry; | |
| var properties =json.features[i].properties; | |
| properties.geometry = geometry; | |
| if (geometry.type == 'Polygon') { | |
| pathDataSet.push(calcCoords(geometry.coordinates[0], properties)); | |
| } else if (geometry.type == 'MultiPolygon') { | |
| geometry.coordinates.forEach(function(coordinates){ | |
| pathDataSet.push(calcCoords(coordinates[0], properties)); | |
| }); | |
| } | |
| } | |
| var raindrop = svg.selectAll('path') | |
| .data(pathDataSet ) | |
| .enter() | |
| .append('path') | |
| .attr({ | |
| 'stroke':'white', | |
| 'fill':'#6666ff', | |
| 'opacity':0.9 | |
| }) | |
| .attr('d', function(d){ return d.scatterPath } ) | |
| .attr('transform', function(d, i){ | |
| var center = path.centroid(d.properties.geometry); | |
| var y = ~~center[1]; | |
| return 'translate(0,'+(0-y)+')'; | |
| }); | |
| var update = function(){ | |
| raindrop | |
| .transition() | |
| .duration(1000) | |
| .delay(function(d){ return (Math.random() * 10 ) * 1000 }) | |
| .attr('opacity', 0.6) | |
| .attr('transform','translate(0,0)') | |
| .attr('d', function(d){ return d.geoPath } ) | |
| .each("end", function () { | |
| d3.select(this) | |
| .transition() | |
| .duration(1000) | |
| .delay(function(d){ return (Math.random() * 10 ) * 1000 }) | |
| .attr("opacity", 0) | |
| .each("end", function () { | |
| d3.select(this).attr('d', function(d){ return d.scatterPath } ) | |
| .attr('transform', function(d, i){ | |
| var center = path.centroid(d.properties.geometry); | |
| var y = ~~center[1]; | |
| return 'translate(0,'+(0-y)+')'; | |
| }) | |
| .attr("opacity", 0.9); | |
| }); | |
| }); | |
| setTimeout(update, 1000 * 10); | |
| } | |
| update(); | |
| }); | |
| </script> | |
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