Built with blockbuilder.org
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-geo-projection.v1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.15.0/lodash.min.js"></script>
<style>
/* blend options taken from visual cinnamon tutorial: //www.visualcinnamon.com/2016/05/beautiful-color-blending-svg-d3.html */
/*Set isolate on the group element*/
svg { isolation: isolate; }
/*Set blend mode on SVG element: e.g. screen, multiply*/
.delauney path { mix-blend-mode: multiply; }
.snowflake line, .snowflake path{mix-blend-mode: overlay};
</style>
</head>
<body>
<svg></svg>
<script>
var data = [
[14.599512, 120.984222, 'Manila, Philippines'], // lat, long
[39.922478, 116.443710, 'Beijing, China'],
[35.443707, 139.638031, 'Yokohama, Japan'],
[36.0835, 140.0766, 'Tsukuba, Japan'],
[34.170563, -118.837593, 'Thousand Oaks, USA'],
[42.361145, -71.057083, 'Boston, USA'],
[37.871853, -122.258423, 'Berkeley, USA'],
[40.730610, -73.935242, 'New York, USA'],
[29.951065, -90.071533, 'New Orleans, USA'],
[61.217381, -149.863129, 'Anchorage, USA'],
[51.508530, -0.076132, 'London, UK'],
[52.344444, 4.916667, 'Amsterdam, Netherlands'],
[48.870502, 2.304897, 'Paris, France'],
[41.390205, 2.154007, 'Barcelona, Spain'],
[40.416775, -3.703790, 'Madrid, Spain'],
[38.736946, -9.142685, 'Lisbon, Spain'],
[47.608013, -122.335167, 'Seattle, USA'],
[35.652832, 139.839478, 'Tokyo, Japan'],
[34.3852, 132.4553, 'Hiroshima, Japan'],
[34.6937, 135.5022, 'Osaka, Japan'],
[64.135666, -21.862675, 'Reykjavík, Iceland'],
[59.334591, 18.063240, 'Stockholm, Sweden'],
[22.108543, -159.496765, 'Kauai, USA'],
[41.7688, 140.7288, 'Hakodate, Japan']
];
var width = 600;
var height = 400;
var svg = d3.select('svg')
.attr('width', width)
.attr('height', height)
var delauney = svg.append('g').classed('delauney', true);
var colors = d3.scaleOrdinal()
.range(['#B6DEED', '#F5C6DD', '#9E84C2', '#D3BEDA', '#FFE4E1']);
var voronoi = d3.voronoi();
var projections = [
'geoGringortenQuincuncial',
// 'geoGingery',
// 'geoPeirceQuincuncial',
// 'geoSinuMollweide',
// 'geoWiechel'
];
var triangles = _.map(projections, function(projection) {
projection = d3[projection]()
.translate([width / 2, height / 2]);
var points = _.map(data, function(points) {
// d3 projection takes [long, lat]
return projection([points[1], points[0]]);
});
return voronoi.triangles(points);
});
delauney.selectAll('g')
.data(triangles)
.enter().append('g')
.selectAll('path')
.data(function(d) {return d;})
.enter().append('path')
.attr('d', function(d) {
return 'M' + _.map(d, function(point) {
return point.join(',');
}).join(' L') + 'Z';
}).attr('fill', function(d, i) {return colors(i)})
.attr('stroke', function(d, i) {return colors(i)})
// .attr('stroke-width', 1.5)
.attr('opacity', 0.75);
// draw snowflake
var snowflake = svg.append('g')
.classed('snowflake', true)
.attr('transform', 'translate(' + [width / 2, height / 2] + ')scale(2)');
var angles = _.times(6, function(i) {
return 60 * i;
});
var flake = snowflake.selectAll('g')
.data(angles).enter().append('g')
.attr('transform', function(d) {
return 'rotate(' + d + ')';
});
var strokeWidth = 1.25;
var strokeColor = '#fcfcfc';
flake.append('line')
.attr('y1', -50)
.attr('y2', 50)
.attr('stroke-width', strokeWidth)
.attr('stroke', strokeColor);
// draw the diamonds for the snowflake
var transforms = [
[[0, -36], 1.25, .5], // translate, scale, opacity
[[0, -28], 1, .25],
[[0, -20], 1, .25],
[[0, 0], .7, 0.1],
];
flake.selectAll('path')
.data(transforms)
.enter().append('path')
.attr('d', 'M0,-12 L10,0 L0,12 L-10,0 L0,-12Z').attr('transform', function(d) {
return 'translate(' + d[0] + ')' +
'scale(' + d[1] + ')';
}).attr('fill', strokeColor)
.attr('fill-opacity', function(d) {
return d[2];
}).attr('stroke-width', strokeWidth)
.attr('stroke', strokeColor);
</script>
</body>